finally alstons and bmr subframe installed with pics
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Re: finally alstons and bmr subframe installed with pics
Right so in 8 feet its only accurate to about 1/16", not the 0.0005" your post I quoted says. Two completely different numbers. On top of that you're relying on how accurate you can read the bubble, which introduces a possible error all its own. Try some different thicknesses of skew under your level and find out how accurate you can actually read it from what you think is level.
If you know how to use a bubble level, you will be more accurate than a laser. Problem is most people don't know how to double level, refine level, or most other basic surveying techniques that are meant to get you down to the accuracy or resolution of the instrument. They just want something that they know the tolerance of and can see where its pointing.
However, I think we can all agree that beyond 1/16" in accuracy is overkill for our cars.
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Re: finally alstons and bmr subframe installed with pics
As with any measuring instrument its accuracy depends on its quality of construction and how it is calibrated.
With a laser level the good ones are +/- 1/16" in 100ft so in 10 feet theory they would be 10x more accurate in 10 ft. One issue with a laser level is the thickness of the beam.
With a compensating optical level again well was it built and for what applications. A David White inst is fine for laying out patios and sidewalks.
My level is calibrated to 0.005' in 300ft. First order optical levels have the same accuracy but come with a micrometer adjustment for fine sighting.
ANY optical level is subject to eye parallax.
Electronic levels eliminate eye parallax but the rod has to be in very good focus to read the bar code rod.
Then there is the error by not having your measuring rod perfectly plumb. If its tilted out of plumb then your reading is wrong.
But as said earlier, on a 3rd gen who cares for less than 1/4 inch.
As for Pablos sag, you need the factory manual to determine the difference in points near the ends of the frame or unibody and somewhere near the middle under the B piller.
With a laser level the good ones are +/- 1/16" in 100ft so in 10 feet theory they would be 10x more accurate in 10 ft. One issue with a laser level is the thickness of the beam.
With a compensating optical level again well was it built and for what applications. A David White inst is fine for laying out patios and sidewalks.
My level is calibrated to 0.005' in 300ft. First order optical levels have the same accuracy but come with a micrometer adjustment for fine sighting.
ANY optical level is subject to eye parallax.
Electronic levels eliminate eye parallax but the rod has to be in very good focus to read the bar code rod.
Then there is the error by not having your measuring rod perfectly plumb. If its tilted out of plumb then your reading is wrong.
But as said earlier, on a 3rd gen who cares for less than 1/4 inch.
As for Pablos sag, you need the factory manual to determine the difference in points near the ends of the frame or unibody and somewhere near the middle under the B piller.
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Re: finally alstons and bmr subframe installed with pics
FOr the accuracy of consistincy of the laser level I listed? I will sayu again it is dead nuts accurate for the application.
Fact: Whenever I set the scales using this level and baseline setup the SUpetruck chassis to 52.4% creoss weight....THEN... I transported the entire rack and scale setup to another location and used the laser to again setup the rack and scale system and THEN set the untuched car upon it the scales ALWAYS registered 52.4%. That laser is dead nuts accurate for this intended use- that task was performed probably 560 times and was always perfect.
You have to know how to use the laser level- Key note is to always use the front self leveling pointer and rest it on a platform that you can rotate it 360* with the front pointer reading- Do NOT use the front readings and then the side readings together in the same perimeter gauging - this is where the accuracy deficiancy lays.
Fact: Whenever I set the scales using this level and baseline setup the SUpetruck chassis to 52.4% creoss weight....THEN... I transported the entire rack and scale setup to another location and used the laser to again setup the rack and scale system and THEN set the untuched car upon it the scales ALWAYS registered 52.4%. That laser is dead nuts accurate for this intended use- that task was performed probably 560 times and was always perfect.
You have to know how to use the laser level- Key note is to always use the front self leveling pointer and rest it on a platform that you can rotate it 360* with the front pointer reading- Do NOT use the front readings and then the side readings together in the same perimeter gauging - this is where the accuracy deficiancy lays.
Last edited by Vetruck; 07-10-2010 at 11:22 PM.
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Re: finally alstons and bmr subframe installed with pics
I'm not sure. I know that on the outside, you get it close to being level using the level bubbles on the outside of the level, whether its a level vial or a bullseye bubble. I know that Spectra uses prisms suspend from the inside of the instrument to get a true plumb and auto compensator's to refine the leveling down to +/- 1/16". Not sure how the off the shelf hardware store ones do it though.
Last edited by JamesC; 07-11-2010 at 08:58 PM.
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Re: finally alstons and bmr subframe installed with pics
I'm not sure. I know that on the outside, you get it close to being level using the level bubbles on the outside of the level, whether its a level vial or a bullseye bubble. I know that Spectra uses prisms suspend from the inside of the instrument to get a true plumb and auto compensator's to refine the leveling down to +/- 1/16". Not sure how the off the shelf hardware store ones do it though.
The trip pod ones are pricy pricy pricy fancy stuff, why I still don't have one.
Reminds me of the water filled compus everyone had in their car back in the day. It self levels to give an accurate heading.
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Re: finally alstons and bmr subframe installed with pics
I'm thinking it would be an optical level based on something like a BB gun scope. It wouldn't be too hard to make a tribrach out of some plate and 3 machine screws and a tripod out of some 2x4's.
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Re: finally alstons and bmr subframe installed with pics
Why go to all that expense and headache? Just go to Home Depot, buy a 5 gallon bucket, some clear 3/8" tubing, and make a water level. It will be every bit as accurate as the bubble level or laser level. Tape the tubing to a piece of wood, put it on your first point (jackstand, preferably the high one), mark it at the bottom of the meniscus, and raise all the others to that same height.
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Re: finally alstons and bmr subframe installed with pics
Most optical levels do not focus under 5-10 feet.
For leveling a car a water level would be the most accurate.
If you looked at a optical level and tripod you would see why building your own is a waste of time
For leveling a car a water level would be the most accurate.
If you looked at a optical level and tripod you would see why building your own is a waste of time
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Re: finally alstons and bmr subframe installed with pics
Got my MAC's on Friday and did a quick test fit just now. I noticed that with stock exhaust this style doesn't seem to work. Can anyone else verify this? It looks like the passenger side SFC will not clear the exhaust where it routes under the passenger side floorpan.
The quality is nice but after looking again at the Alstons, I think I'd rather have those than the MACs. Maybe I'll sell em and get the Alstons afterall. The MACs are nice, but its basically bent tube with a flat plate on them to attach to the subframe. They don't have that nice taper like the Alstons do.
The quality is nice but after looking again at the Alstons, I think I'd rather have those than the MACs. Maybe I'll sell em and get the Alstons afterall. The MACs are nice, but its basically bent tube with a flat plate on them to attach to the subframe. They don't have that nice taper like the Alstons do.
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Re: finally alstons and bmr subframe installed with pics
Got my MAC's on Friday and did a quick test fit just now. I noticed that with stock exhaust this style doesn't seem to work. Can anyone else verify this? It looks like the passenger side SFC will not clear the exhaust where it routes under the passenger side floorpan.
The quality is nice but after looking again at the Alstons, I think I'd rather have those than the MACs. Maybe I'll sell em and get the Alstons afterall. The MACs are nice, but its basically bent tube with a flat plate on them to attach to the subframe. They don't have that nice taper like the Alstons do.
The quality is nice but after looking again at the Alstons, I think I'd rather have those than the MACs. Maybe I'll sell em and get the Alstons afterall. The MACs are nice, but its basically bent tube with a flat plate on them to attach to the subframe. They don't have that nice taper like the Alstons do.
Well formed bent tube on a pro $$$$$$ machine.
Not a back yard, grab some square stock min work or tools needed to make it.
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Re: finally alstons and bmr subframe installed with pics
Actually, in pure bending, square stock is better. Tubes are only better in torsion or where you want the same flexural modulus in every direction. Henceforth, nascar chassis elements are box and the roll cages are round. You don't know what direction an impact is coming from which is why a roll cage is round tube. An SFC is undergoing minimal amounts of torsion. Look under any serious truck chassis and you will find a box section chassis. The taller the better.
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Re: finally alstons and bmr subframe installed with pics
Why such concern over "leveling" ?
Are your springs all perfectly equal in spring-rates? Weight all perfectly balanced on each corner?
Lots of interesting talk on precision leveling, but for street subframe connectors it is a total waste of time.
If your suspension is already loaded and the alignment set to that, all the goal is for the SFC's is to try to keep that somewhat managed by strengthening the frame so it doesn't twist that out of whack during hard acceleration or turns.
Someone mentioned dynamic leveling? but using static methods...
We might as well determine dynamic centers of gravity in determining how to weld up the SFC's.
Edit: other reasons of course to install SFC's include eliminate rattles and body sags causing cracks and bad door closing etc...
Are your springs all perfectly equal in spring-rates? Weight all perfectly balanced on each corner?
Lots of interesting talk on precision leveling, but for street subframe connectors it is a total waste of time.
If your suspension is already loaded and the alignment set to that, all the goal is for the SFC's is to try to keep that somewhat managed by strengthening the frame so it doesn't twist that out of whack during hard acceleration or turns.
Someone mentioned dynamic leveling? but using static methods...
We might as well determine dynamic centers of gravity in determining how to weld up the SFC's.
Edit: other reasons of course to install SFC's include eliminate rattles and body sags causing cracks and bad door closing etc...
Last edited by turbosbox; 07-19-2010 at 08:28 PM.
#117
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Re: finally alstons and bmr subframe installed with pics
The Alston's come as a bolt in but you can have them welded up.
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Re: finally alstons and bmr subframe installed with pics
Look at the frame as a spring. If you were to place one wheel on a 4" block, there would be additional stress in the chassis starting at that location. Then you weld in your SFC's. Now take out the block. This really is not any different than preloading a chassis with slapper bars or via the sway bar links or chassis mount location, wedge in the spring, etc. You've put a different spring rate into the car, permanently... and better yet into something that was not only not designed as a spring but does a terrible job of being one. If you think the addition of those SFC's is going to minimize flex on a preloaded chassis... well... its not going to do that very well. Its a couple inches of steel tubing, not a W12x210 I beam (that'd be something in a large building). So what happens if you do that is every time you load and unload that wheel, its going to act a lot different than the other 3. Thats why leveling was brought up. The only real argument one could make is how close is close enough? There is not much symmetry to the chassis either, so making an assumption that a level chassis with a thirdgen and welding in SFC's is going to provide the same amount of resistance to deflection at each of the 4 corners is only going to get you into trouble if you want to consider microscopic effects like these.
Last edited by madmax; 07-19-2010 at 09:04 PM.
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Re: finally alstons and bmr subframe installed with pics
Look at the frame as a spring. If you were to place one wheel on a 4" block, there would be additional stress in the chassis starting at that location. Then you weld in your SFC's. Now take out the block. This really is not any different than preloading a chassis with slapper bars or via the sway bar links or chassis mount location, wedge in the spring, etc. You've put a different spring rate into the car, permanently... and better yet into something that was not only not designed as a spring but does a terrible job of being one. If you think the addition of those SFC's is going to minimize flex on a preloaded chassis... well... its not going to do that very well. Its a couple inches of steel tubing, not a W12x210 I beam (that'd be something in a large building). So what happens if you do that is every time you load and unload that wheel, its going to act a lot different than the other 3. Thats why leveling was brought up. The only real argument one could make is how close is close enough? There is not much symmetry to the chassis either, so making an assumption that a level chassis with a thirdgen and welding in SFC's is going to provide the same amount of resistance to deflection at each of the 4 corners is only going to get you into trouble if you want to consider microscopic effects like these.
I realize the need to have the car sitting level before installing them, like not in a twisted configuration, but this thread is a carryover from others on the same topic, and some points have gotten lost.
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Re: finally alstons and bmr subframe installed with pics
Um, yes, I would expect SFC's to minimize body flex, or why put them on? Decorations to add ballast? Show pieces for cruise night? Exhaust protectors for speed bumps? Jack points?
I realize the need to have the car sitting level before installing them, like not in a twisted configuration, but this thread is a carryover from others on the same topic, and some points have gotten lost.
I realize the need to have the car sitting level before installing them, like not in a twisted configuration, but this thread is a carryover from others on the same topic, and some points have gotten lost.
Just start with a level frame and then you are starting with a perfect canvas. Otherwise? so much for best performance- people on race tracks always think the other guy is cheating because they have exactly the same parts visually...but not technically. My famous quote once again," Its not just what you have, its how you set it"
Dean
Last edited by Vetruck; 07-20-2010 at 10:20 AM.
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Re: finally alstons and bmr subframe installed with pics
bump from the dead..
simple question, how is the ground clearance on the alstons/MAC's? anyone take any side pictures? my car is low, i dont want to be scraping the crap out of them
simple question, how is the ground clearance on the alstons/MAC's? anyone take any side pictures? my car is low, i dont want to be scraping the crap out of them
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Re: finally alstons and bmr subframe installed with pics
Resurrect to say that until finding this, I too would've never considered combining different SFCs under one car. Maybe a chart of which brands work together, as a sticky?
Looks to me like I can do Spohn + Alston? Or did I misunderstand?
Looks to me like I can do Spohn + Alston? Or did I misunderstand?
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Re: finally alstons and bmr subframe installed with pics
Guys, I know everyone is saying that you should only weld these on with the cars suspension loaded, but I have mine tore all the way down to the shell and plan on putting it on a rotisserie. It would be so nice and easy to weld these on while on the rotisserie. Just wondering if anyone has actually had problems after doing this.
And I have the Hotchkis SFC's does anyone know if any of these inner ones aren't compatible for some reason?
Last edited by white1991rs; 05-24-2012 at 08:08 AM. Reason: mistake
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Re: finally alstons and bmr subframe installed with pics
isn't that the whole point?? to adequately tie the subframes together?? why hasn't anyone made a set that combines both designs?? why do we have to buy TWO different sets just to get it right??
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Re: finally alstons and bmr subframe installed with pics
Most of the time if you want it done right you have to build it yourself...
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Re: finally alstons and bmr subframe installed with pics
Saw this when it originally went up, but was getting deep into a LS1 installation.
Like the OP says, the difference is amazing. Definitely worth doing, adding inner connectors (Alston's for me) to outers you already have…OR… putting both on. I already had some custom outers done years ago. They made a big difference, but were clearly not enough with a move to New England, and it's challenging roads.
Warning to LSX types- the Alston's require some work to the Hawk's transmission mount. Both want to be in the same place, so a bit of fitting is needed. WORTH the effort.
Like the OP says, the difference is amazing. Definitely worth doing, adding inner connectors (Alston's for me) to outers you already have…OR… putting both on. I already had some custom outers done years ago. They made a big difference, but were clearly not enough with a move to New England, and it's challenging roads.
Warning to LSX types- the Alston's require some work to the Hawk's transmission mount. Both want to be in the same place, so a bit of fitting is needed. WORTH the effort.
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Re: finally alstons and bmr subframe installed with pics
gotta say guys. I had the inner alstons bolted in and they worked for a little while... at the time i had minimal welding skills and no drive-on "loaded chassis" lift so i took it to a local race shop, they reccomended a full S&W subframe kit. after learning about it, i was all in. i ended up selling the alston inner bars to ed-pontiac.
very happy with this subframe setup:
posts of the frame start at my #4 post
https://www.thirdgen.org/forums/susp...rame-into.html
or view it on my dumb-*** website:
http://www.freewebs.com/iroczman15/workdonein2009.htm
since then the underside has been completley stripped down to metal, undercoated as well as the rear .
of course im not putting down a ton of horsepower, but this kind of frame that ties into rockers, has a driveshaft loop, and an integrated tq-arm has been incredible for the past 4 years.
just wanted to put it out there for curious fbody wrenchers
very happy with this subframe setup:
posts of the frame start at my #4 post
https://www.thirdgen.org/forums/susp...rame-into.html
or view it on my dumb-*** website:
http://www.freewebs.com/iroczman15/workdonein2009.htm
since then the underside has been completley stripped down to metal, undercoated as well as the rear .
of course im not putting down a ton of horsepower, but this kind of frame that ties into rockers, has a driveshaft loop, and an integrated tq-arm has been incredible for the past 4 years.
just wanted to put it out there for curious fbody wrenchers
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Re: finally alstons and bmr subframe installed with pics
ALSO. JUST IN CASE PEOPLE WANTED TO SEE PHOTOS OF THE s&w KIT "ISOLATED" HERE IS A LINK TO PHOTOS I TOOK WHEN I WAS SANDING DOWN THE UNDERSIDE OF THE CAR AND LEAVING THE FRAME INTACT, IT SHOWS THE CONTOURS AND PARTS OF THE FRAME SETUP MUCH BETTER
http://www.freewebs.com/iroczman15/workdonein2010.htm
http://www.freewebs.com/iroczman15/workdonein2010.htm
#131
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Re: finally alstons and bmr subframe installed with pics
Gonna bump this, as im gonna take this route myself now and rally make things solid, might even tie the two in spots...
cept BMR is funny, same price on website and ebay, cept ebay is free shipping, website is not. with ebay fees n paypal, they lose money, direct website sale you make more, so you charge shipping there??? would of ordered them tonight if the website didn't want $45 shipping.
cept BMR is funny, same price on website and ebay, cept ebay is free shipping, website is not. with ebay fees n paypal, they lose money, direct website sale you make more, so you charge shipping there??? would of ordered them tonight if the website didn't want $45 shipping.
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Re: finally alstons and bmr subframe installed with pics
How did ya get the LCA bolts out? even cut the head off, wouldn't turn, won't pound out, tempted to drill them out, but my luck the sleeve will start to spin 90% done....
#134
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Re: finally alstons and bmr subframe installed with pics
20141203 184004
20141107 234154
20141108 013625
I had the Alston inners and the Spohn crossmember. As stated above they want to occupy the same spot and the crossmember dose not want you to have exhaust so this is what ended up happening.
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#135
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Re: finally alstons and bmr subframe installed with pics
Gonna bump this up again to the Trump era: when ya get the BMRs (to combine w the Alstons) is it SFC008 or 009? With Hooker 2055s + MF catback in my case.
This would seem to indicate 009s but I recall the 008 seemed to fit shorties too(?) and be the more traditional design like the UMI sfc?
BMR offers two versions for different exhaust combinations. Part Number SFC008 is designed for cars with full length headers and exhaust systems that run inside the frame rails. Part Number SFC009 is designed for cars equipped with the OE manifolds or shorty headers with OE exhaust or OE type exhaust that runs on the passenger side, outboard the subframe.
This would seem to indicate 009s but I recall the 008 seemed to fit shorties too(?) and be the more traditional design like the UMI sfc?
BMR offers two versions for different exhaust combinations. Part Number SFC008 is designed for cars with full length headers and exhaust systems that run inside the frame rails. Part Number SFC009 is designed for cars equipped with the OE manifolds or shorty headers with OE exhaust or OE type exhaust that runs on the passenger side, outboard the subframe.
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Re: finally alstons and bmr subframe installed with pics
SFC008
The tail of the squib mentions the OE type exhaust- seems to include the outer passenger side routing. Such an exhaust setup will not work with a LS motor installed. Long tubes or no, the exhaust wants to run down the center of the car. That would seem to indicate 008. I bet the 009 just makes a bunch of space accommodations you will not need to worry about.
The tail of the squib mentions the OE type exhaust- seems to include the outer passenger side routing. Such an exhaust setup will not work with a LS motor installed. Long tubes or no, the exhaust wants to run down the center of the car. That would seem to indicate 008. I bet the 009 just makes a bunch of space accommodations you will not need to worry about.
Last edited by Flip 2; 02-25-2018 at 03:57 PM. Reason: try to fix italics
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Re: finally alstons and bmr subframe installed with pics
Sorry, going to necro this thread again - anyone have pics of both the Heidts and BMRs installed? F@*king Photobucket ruined yet another thread it seems.
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