What do you think of these pics?
http://24.1.139.249/images/DCP_0267.JPG
http://24.1.139.249/images/DCP_0268.JPG

Considering my current power of 317 HP at 4800 rpms and 418 TQ at 3400 rpms, any guesses as to my new power with runners this short?

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
317 RWHP, 418 RWTQ
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Member: SoCal F-Bodies
-=ICON Motorsports=-

 

I'd say you won't have any power. That's a big vacuume leak

 

hahahahaah......lol, And I thought the leak I had was big...hahahahahaah..

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1989 IROC-Z Convertible, 305 TPI 5-Speed 97,000 milez. all stock inside and out, No Modz, very clean ride!

 

who needs ram air with those? LOL hahahah

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88' IROC-Z, 350 TPI, 700-R4

 

You really need to lay off the crack, lol, i think removing the entire outside wall to port them wasa little much, if you wanted to go that far, why not just custom make your own box style runner/plenums and sell the SLPs to someone who's motto must be...i was just gonna clean 'em, but then i got high....

 

I guess 335 HP at 5250 RPM and 435 TQ at 3800 RPM. That's gonna make for one hell of a flat powerband!!!Too bad it looks like it'll kill your low-end torque.

Y'know, I was actually gonna try to make a super-ram outta some spare aluminum I have...I already have siamesed the stock runners with success. Maybe take some stock runners, chop 'em, siamese 'em, and make a top and bottom from a heavier-guage aluminum, and the sides from light-gage aluminum. I could probably do it, although I don't know how good it'll flow...probably not as much as a real Super-ram, but it would only cost me $50 bucks! Bet it'd make one hell of a custom-mod!

[This message has been edited by dhirocz (edited August 30, 2001).]

 

Obviously I will seal them up before I install them. The other side is done but I didnt get a pic of them yet.

Its easier to start with something already made and modify it, than it is to do something from scratch.

435 torque, you think it will go up that much? I was thinking less, like 380 TQ or so.

 

I like the work you did on the runners. This is an effective way to reduce the tuned length of the runners. Try to achieve as much plenum volume as you can when you seal them up. The volume you end up with will depend on your creativity, fabrication skills and welding ability. Getting the fasters back to hold it together will also reduce the plenum volume. I have done a bit of sketching and brainstorming on this exact idea. In terms of engine performance, you will extend your torque curve to higher rpm and thus generate more peak horsepower. Kevin, I must say that I have studied your current engine combination and I am very impressed. It is one of the nicer long tube setups I have seen and you should be very proud of it! Your power and torque numbers speak for themselves. In my estimation, your torque peak will raise about 600 rpm and you should make more torque at this new resonance point since inertial effects(not resonance effects) will be greater at the higher rpm. You will lose some torque in the 3500 rpm region, but only because that was the tuned point for your long tubes. I would expect gains a little better than switching to a superram, since your effective runner length will be shorter. I would love to be kept informed on the results and how you fabricate the plenum. My email is r13626@email.mot.com

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Dave Zelinka

 

I was thinking of doing this very same thing. How much shorter is the runner length?
Please post the dyno figures & pics when you're done.



[This message has been edited by whiteroc (edited August 30, 2001).]

 

I dont know the runner length, but it appears to be shorter than a SuperRam runner, for sure. I'm hoping to have the runners done and installed by next week for track testing on Saturday, but it depends on the guy building them.

Yelofvr, thank you very much for the compliments!

 

Kevin,
Are you going to weld the back pieces back on yourself?
I have the SLP and did something similar as you did, but I cut the back runners open about 2-3 inches wide to be able to get inside and knock down the inside wall.
Im going to be looking for someone to weld a sheet of aluminum or something to the back when its done, hopefully I can find someone to.Im oping for that tricked out look with the tig welds or something.
Dont know the correct welding terms but have a idea what I want.

You did a fantastic job...cant say my work has come out that nice yet.
Havent had much time to do the rest but will like to see you keep us posted about the final finish and etc.



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1986 Vette Coupe,auto, 357 L98 w/alum. heads,40 over,crane cam,3.73 Gears,The usual Mods..
Had an 86 Bird before..want to get another F car again!

 

Here are some new pics the guy sent me:

http://24.1.139.249/images/082901/

They're the ones at the bottom that start with MVC.

Unfortunately it doesnt look like he will get them done in time for the drag race this Saturday. So it'll be another two weeks...

 

I didn't realize that you were connecting all four ports together. That'll be interesting.

 

By Joining all of the ports together should be equivelant to decreasing Runner length to the lenght of the base. That might help tremendously. I would be interested as well to hear how it goes.


John

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87 Formula Yellow/Black

5.1 TPI Automatic
Baer 12" brakes 4 wheels, KYB AGX Adjustable Shocks & struts, Custom Leather interior, WAAAY TOO MANY MODS TO LIST

87 Formula TPI (5 Speed) Yellow/Gray STOCK

1967 Buick Riviera 430hp Turns high 14's (Not bad for 4300 lbs)

83 Camaro (Parts)
83 T/A (parts)

http://www.3rdgenformula.com

 

ME too!!!!

 

damn...now THAT'S what I call a siamesed runner! Now that I know that, I know your torque peak will rise for sure, as well as HP...you'll probably make enough of that!

I'm not gutsy enough to do that to my new pair of SLP's...but I am planning on taking out a good bit of that divider wall. Keep us posted, huh? That would be a great high-RPM hihg-flow LTR setup for a bigger engine...siamesed base with fully siamesed SLP's and a 58mm TB.

I plan on using a coarse cross-buff on a flex-wand thingy on the end of my grinder to take out material in the hard to reach areas of the runners, after using the cutting bits, then stepping down to medium and fine.

 

Update on this project if the pictures work.

Jerry

 

One more time.

 

The runners are now 2 3/4 long.

 

Wow, that's really something. I took a bunch out of mine, but not like that. I can stick my entire index finger into where the divider used to be. Let us know how it runs.

 

I can't really see the welds..very nice job. Can't wait to see how it performs...

 

Looks good Kevin. Can't wait to see the results. They actully look very similar to some that GM made for a project car years ago.

 

so how does it run with 2 3/4 inch runners?

 

Jerry still has them. Believe me, once they're on my car, I will post the seat of the pants feeling, and get to a dyno and/or the race track as soon as I can!

 

I was thinking if that works. you could or I could have them (untouched slp runners) cast in a sand mold and not have to worry about the inside being solid because they would be opened up any way.


If I only new how much I could have done in H.S. metals I would have done some really cool intake mods.(we had sand molds lathes, a mill, welders up the you know.)

 

Kevin91Z -

I was thinking of doing the same thing to my SLP runners. I know it's an old post, but how much difference good or bad did it make on the dyno and on the drag strip? Please let me know, very interested!

Thanks,
Mike (1bad91Z)

 

WOW... Very good work Jerry, you amaze me.... , any updates Kevin?

 

It takes a whole lot of work to do that to a runner. I don't think they're all done yet

 

What mods does Kevin have to make that much power??

 

He has....


350 TPI V8
Aluminum L98/ZZ3 Heads, Ported by Don Lorentzen
Ported TPIS BigMouth Intake by Don Lorentzen
TPIS Large Tube Runners
LT4 HOT Cam
GM 24lb/hour LT1 Fuel Injectors
Crane 1.52 Roller Rockers
Ported Plenum
160º Thermostat
K&N Air Filters
Custom Prom by Me
Modified Air Intake Boxes
Homemade Ram-Air by Dwayne
!Fog Lites
SLP 1 3/4" Headers
Custom 2 1/2" Y-Pipe
Dual 2 1/2" High Flow Car Sound Cats
Exhaust Cut-Out (after cats, for drag racing only)
Flowmaster 3" Cat-Back
TPIS 52mm Throttlebody
TPIS Throttle Body Airfoil
!TB Coolant
Crane Adjustable Fuel Pressure Regulator
Relocated IAT/MAT
McLeod Street Twin Clutch
Hurst Shifter
Hurst T-Handle Shift **** with Button
TCI Roll Control
1LE/JG1 Aluminum Driveshaft
GM 9-bolt w/ 3.70 gears
Bosch Platinum Spark Plugs
Borg Warner Select 8mm Spark Plug Wires
Mobil 1 10w-30 Synthetic Motor Oil
Raybestos PG Plus Brake Pads
Jegs Driveshaft Loop
Hotchkis Lower Control Arms
Hotchkis Panhard Rod
Steering Brace Support ("Wonder Bar")
Alston SubFrame Connectors
Clarion DRX7475 Stereo/CD Player installed by Robert 'the man' Wilson
Arctic White Stripes
BFG 255-50-16 Drag Radials on 16" Stock Z28 Rims
Corvette-style EGR after TPIS Large Tube Runners



Anything else need to be added Kevin?

 

uhhh...that's it??

That Don guy must know how to PORT!! Nice mods & numbers!

 

just wondering...but how long are LT1 runners compared to those things? Quite interesting.

 

LT1 runners are 3 inches long. Just measured them on mine.

 

this thread is beyond the verges of old. So, what was the outcome??? Does anyone knoe? did he even use them?????

 

Good question......................

 

This thread is hardly even old. I've seen threads twice as old uncovered recently. Threads from when I had to walk five miles to school in six feet of snow. Read above, as far as I know they aren't done yet.

 

Doesn't this totally delete the "Tuned Port" part of this intake setup?

I cannot see how this setup will produce any usable power because you are screwing up the "air plug" from the resonance created by the tuned runners.

I can see this really messing up the flow into the head and causing unecessary turbulation at the manifold base.

Then again, I could be wrong. Put it on a dyno and lets see!

 

Nope, still no runners to test. Jerry is a really busy man, and has had some bad health problems in the last year. Not to mention he is working on his own car too, getting that prototype LT1 intake manifold to work for his project.

Just be patient guys. As soon as I have them on my car, I will post it all over the boards.

Formul8, I think this will make power similar to an LT1 intake or siamesed TPI intake. These runners effectively halve the length of the stock runner, while greatly increasing the plenum volume.

 

I always wondered why aftermarket companies didn't make shorter runners for our cars. If this works, you may have to contact someone about production....this could be even better than the LT1 intake swap if it works out.

 

SIZE=3]Looks good Kevin. Can't wait to see the results. They actully look very similar to some that GM made for a project car years ago.[/SIZE]

I remember that car, even have the Super Chevy issue somewhere. A white 92 RS with an aluminum headed L98 & a ZF 6 speed. It would have been a limited 25th anniversary run of 602 cars, but was killed off. It is rumored that this same car is the yellow Ram Jet GM camaro. Didn't those runners look WICKED!!!!!

 

another runner thread(bunch of pics)
https://www.thirdgen.org/techbb2/sho...ht=runner+glue

 

heavily modded indeed, someone took the time...

 

Any results on these runners yet?
I am very interested in the dyno #s and track times.

 

Edit: OOPS. Wrong Post. Thought it was mine.

Yes there are new results. The dyno results and graph have already been posted. However the baseline was 283RWHP and 311 on torque. With the runners mods the results were 304RWHP and 334 on torque. These are SAE numbers. Actually were a little higher.

Went to the track yesterday for some time slips. My previous best before the TPI mods was 13.30et and 103.50 mph. On other change I made and a big one was to replace my SLP 2400 stall torque converter for a Yank SS3600. My new times are 12.73et and 105.85mph.

You could probably split the time improvement evenly between the Yank SS3600 torque converter and the TPI mods. However I believe most of the MPH improvement is do to the TPI mods. Allen