Anyone got flow numbers on the LT1, lt4, or siamesed intakes? Would sure help to compare when looking at them vs. the Miniram and Superram. Especially when considering the cost VS. performance issues. I've used both the superram and the miniram. I was happier with the miniram, though mainly just due to the installation issues, and all in all it cost a bit less than the superram. But the cost is outrageous, so a little comparison data would be very useful. I mean I could just about get a custom intake for the cost of one of those two. I would hate to spend 1200, when for 300 an LT1 or Siamesed TPI flows pretty much the same (even worse if it was a stock TPI that had been siamesed instead of aftermarket, making it a free mod). On the other hand I'd hate to put all that work in modifying an intake when I'd of seen a lot more improvement by spending the money.

Also what cars can we find the LT1 intakes in to assist in our junkyard crawling.

If you don't have flow numbers let's see some more before and after dyno or strip numbers, something so we can see if the work and or money are worth it.

So post those results and flame on
John

 

It'll be tough to find flow numbers for an LT1 intake, since the guys that use the LT1 intake never really port 'em. The LT1 intake is good to 10's naturally aspirated. It really is essentially a miniram. If you're looking for an LT1 intake and fuel rails, look for 'em in wrecked 4thgen f-bodies (94-97), Chevy Impalas ('94-'96), some buick roadmaster station wagons (no clue really what years), and some Chevy Caprice cars (similar years to the F-body). You can use a corvette LT1 intake, but you'll need f-body fuel rails.

 

Quote:

If you're looking for an LT1 intake and fuel rails, look for 'em in
wrecked 4thgen f-bodies (94-97), Chevy Impalas ('94-'96), some buick roadmaster station wagons (no clue really what years), and some Chevy Caprice cars (similar years to the F-body). You can use a corvette LT1 intake, but you'll need f-body fuel rails.

1994 - 1997 F-bodies
1994 - 1996 B-bodies (Caprice & Roadmonster)
1994 - 1996 D-bodies (Fleetwood Broughams)

HTH!

 

i'm pretty sure the f-bodies had LT1 from 93-97
Andrew

 

yep, 93-97. theres really no reason to compare flow numbers from a LT1/4 manifold to a miniram, its the same thing, and its gonna have the pretty much the same powercurve as a miniram. super ram is just gonna have a bit more low end than the other two, but it wont rev as high. it just all depends what your going for and how you like the "feel" of the power in your car. the super ram will give you more punch down low in the rpm range, but the miniram and LT1 manifold have plenty of power down low too if your engine makes good power to begin with

 

The LT1 is really the way to go. That's why all this stuff started in the first place. If you want serious numbers you can forget a LTR setup. You need a revamped intake like a MR or SR. But then they cost so much. The LT1 is comparably very inexpensive and gives the performance of a MR. Hey, and we're just not talking out of our asses. I've gone the LT1 route. And Mark decided to get the whole damn engine
And yes 1993 F-bodies had the LT1 manifold, but you can't use it for the swap. It slips my mind as to why.

 

the fuel crossover is at the rear of the manifold and i believe someone said it hits the distirbutor. 94+ has the fuel crossover machined into the front part of the manifold

 

Ok guys, we get the point, but as the original poster, let me point out that I also asked for before and after dyno or strip numbers if flow numbers weren't available (or what was needed). In other words I've read all the threads that I could find and the only two people I've seen put up hard numbers are madmax and mike whatshisname on the siamesed intakes. One stock, one edelbrock.

I also said that I've used both the miniram and the superram, check my sig I've built more cars and engines than I care to name, several of them 3rd gen F-bodies.

So what I'm looking for is some numbers. I can accept the fact that the LT1 intake is the pretty much the same as the miniram, but lets see some results. Take your cars out to the strip/dyno and post your results. You all keep saying that there is a difference, well let's see it Especially the people who've had it done for a little while. I know you just got yours done Irocnroll, been following the thread, lets here about it when you get to drive it, madmax hows your car running, your siameseing has been done for a while, do you still like it, have you done any more mods that made it more or less effective? have you been back to the dyno once you fixed the rocker arm issue? mike has promised us results in FEB on his further siamesed edelbrock intake.

Enquiring minds want to know
John

 

if its any consulation, my iroc went 13.3 @104 in 90 degree weather. this was with 2.77 rear gears and a weak 700R4 with a siamesed intake base madmax style. pulling to 5500 every shift.

 

13.3 with 2.77 gears? Nice ! Now that's the kinda info I think we're all looking for. Any idea what it did before you did the intake? Who else has seen results.
John

 

I've driven the car but that still doesn't mean anything. I never took the car to a dyno or a track so I have no before numbers to compare it to when I do. It feels great but that still doesn't mean anything. Anytime you do a weeks worth or work to your car you won't let yourself not "feel" improvement.

 

no i dont have numbers before the intake was siamesed, i did it at the same time as the engine swap. the new engine is way more powerful than the stock one, but im sure the siamesed intake helps the new motor breath better than a stock manifold.

 

If I can get the slp runners and a spare base I will do track times this spring. I work real close to the trake now so I can work on the car switching the runners and then the lower intake during a couple nights then take it to work and see how each worked after hours.

 

First of all i would like to point out that LT1 intakes had no provisions to install a distributor. They used the OptiSpark unit found on the crank. Also, the bolt pattern between the TPI heads and the LT1 heads are different. Im not saying the swap isnt doable, but with the above information, nothing short of a HEAVILY modified LT1 intake would work. Personally, i would save the cash instead of buying a mini or super ram, and siamese your existing intake, and install a ZZ9 cam from TPIS. That combo alone would reap much more gains than just a simple intake swap. Total cost? Less than $500 for then cam and installation accessories.

 

Dude, I guess you haven't been around lately. The LT1 intake swap has already been accomplished. And it cost under $500. The modding needed for the intake has been figured out. Go to John Millican's website for all the details.

http://members.home.net/millicanga/s...into_a_1st.htm

 

actually the optispark runs off the dowl pin on the camshaft, not the crank. and the cost of putting a LT1 is around 300-400 bucks from what people on here are saying (unless you mod your own, then its less). john millican could tell you more about it, hes the one who started the rave on this board with his LT1 manifold equipped SBC 383

 

Go here --> http://www.eecis.udel.edu/~davis/z28...MRwebpage.html

For some dyno results by Mike Davis. The link above compares a Miniram to AS&M Large Tube Runners & Edelbrock base (with LT-4 cam) and ported Aluminum L98 heads.

Another --> http://www.eecis.udel.edu/~davis/z28...age010511.html

Is for the same engine but with AFR 190s instead of the ported Al L98 Heads and with semi-siamesed runners and heavily ported Edelbrock base.

You will notice that the Miniram with only the the Al L98 heads made as much peak HP as the AFR 190/SSR combo. The AFR/SSR combo made more low-end TQ, but a lot of that also can be attributed to the AFRs. It would be interesting to see the results with the AFRs and Miniram. I think we can predict what would be the best setup.

 

Well, even if its a doable swap, i still think upgrading to a ZZ9 cam with a siamesed TPI intake will produce more power gains than a swap from a TPI intake to a LT1 intake alone. And the cost is about the same. Personally, i think the TPI intake looks cooler too.

 

i have been following these types of posting for some time now and i have been curiouse about something. If one was to disregaurd the restrictions on the LTR's and its intake, and just considering the size of the factory style plenhiem..... how much air flow would it flow and how much HP could the pleniem sustain?

i have been toying with a set of stock LTR/base and been working on haveing them custom fabricated to fully siamised, but with the plenium i was woundering how restrictive this would be .
anyone think this is a good idea? or am i waisting my time. so far all work has been free.

 

I don't any bench numbers for the plenum but I imagine it can't be all that restrictive. I think the main problem with the LTR setup is a small (not restricive) plenum and long runners. What you will be doing by siamesing the runners and plenum is effectively enlarging the plenums area and shortening runner length. Kinda like a Superram which operates the same way. I think it's a great idea and seriously considered it myself (in fact started fabbing the manifold) until the LT1 deal came along. From what I gather you are planning to join and fully siamese the stock runners correct? What made you choose to use the stock runners rather than an already joined aftermarket set?

 

Of course siamesing the stock TPI intake and adding a ZZ9 cam will make more power than just a LT1 intake because you have 2 components working together to make power as opposed to one component that increaces flow - the cam will take advantave of the siamesed TPIs increaced flow. Secondly $375 for cam plus more for springs and pushrods and lifters and like $200 for SLP siamesed runners and $300 for a baseplate thats WORTH porting (cant do much with the stock plate unless you want your siamesed baseplate to have the "sunglasses" look to them). Total = $875 On the other hand, the complete LT1 modded intake, fuel rails, fittings and remote thermostat housing is $540 leaving you $335 to buy the cam you want and make MORE power.

I think the TPI looks cooler too, but its all about going fast for me.
I plan on going with the LT1 conversion this summer!

 

You wouldnt need to purchase new lifters, roller lifters are reusable. Springs and pushrods would be an extra $100. I would just port the stock stuff, no SLP runners or new baseplate cause i couldnt afford it, so it could flow enough air to support 5500 rpm. I realy wouldnt feel safe about spinning a stock bottom ended L98 any higher than that. So, $100 + $375 for ZZ9, and you get under $500. I like to go fast too, but im not willing to do the level of modification as swapping an LT1 manifold and fuel rail kit to gain a tenth or two. For me, a simple porting of the stock intake, plus the added power from the cam (which i heard makes good power on even stock engines), would be enough to make me happy. Low 12s are all im really after.

 

tpis' stuff is too overpriced. almost 400 bucks for a cam is highway robbery. you can get this cam for 175:

Duration @ 0.050" Lift: 218 / 228
Lift: 0.525" / 0.525" (put a rocker combo of 1.5 on I/1.6 on E, and the lift becomes 0.492"/0.525", looks alot like zz9)
Lobe Separation: 112

compared to for $400, you get this:

Duration @ 0.050" Lift: 212/ 226
Lift: 0.483"/0.520"
Lobe Separation: 112

i like the cheaper cams numbers. its the LT4 hotcam by the way.

 

The LT1 swap is a gateway to new possibilites. It'll respond with more power to other mods than just siamesing. The swap shouldn't be looked at alone. But if we are going to compare intakes and cams I'll take that LT1 + hotcam combo any day over a ZZ9 and ported TPI. And yes, they're both under $500.

 

Comp and Crane also offer similar cams for much less than the tpis pieces though more than the hot cam, and that was the hole point of this thread originally, Price V. Performance.
John

 

I have been away from this site for quite a while, so this LT1 swap is a new one for me. What I was thinking was to buy a medium height tunnel ram, have fuel injector bungs installed, fabricate a plenum box to bolt on top of it, run the stock throttle body in front. This would have nice flow characteristics, retain distributor, coolant and bolt up stockness. Might run about the same cost since I can weld up most of the stuff.

 

Oh yeah... the 0.40 over 350 I am putting in this week is running a Sealed Power cam; 209/216 @0.050", mild lift. Drivability is a huge issue as my 71 Pontiac Lemans Sport is the toy.

 

people have somewhat been doing this, called accel pro-ram. its a carb-looking intake, but it has the injector bungs, and its just a 90 degree elbow commning off the manifold with a throttle body on it, instead of a box plenum. do a search for a "pro ram" on this board.

 

Yes it does kinda sound like a Pro Ram. I believe have to run DFI with it though. Scarebird, how do you plan on mounting the fuel rails on your intake? If you can keep cost low enough to justify it it sounds like good idea.

 

iroc n roll... i decided to use the factory stuff because i had a set laying around and just figured what the hell......it will not cost to much as i know a alluminum welder who ows me some favors. it should be interesting to see what happens when it gets done.

 

I'd love to see it when its done. There was another old post the has re-emerged lately with a guy fully siameseing SLP runners. This should have the same effect. Keep us posted.

 

Ok, since I was able to get an LT1 intake for $150 complete ( all the rails, injectors, sensors, TB, etc) I've decided to go that way on the new project. Since I have access to a flow bench and machine shop, I'll run tests on the LT1, stock intake, maybe I'll siamese the stock intake and run tests on it if I've got time, and post the results when I have 'em. Thereby answering my own question - I may even port the LT1 and test that as well. Depends on how much time I have before the engine is finished.
Unfortunately this car came with a shot engine so I won't have any before and after strip times.
John

 

Are you taking bets on which one will flow better? My money is on the LT1 intake.

 

I'm sure, but no I'm just trying to get a price vs performance comparison cause let's be honest, what we all need to know is how fast can we go for how much money we have.
John