I did a really nice job and went a little deeper than most because I REEEEEEELY need less bottom end out of my 383. I would tottaly cut out at 4000-4500 rpm, so I figure the 58mm throttle body extrude honed siamese runners and the intake would probably raise my rpm another 1000rpm. I would have wheel spin through 3rd with my 323 rear and it was making me lose races. I hope this will help. I know you might think it could be an overkill but I think it should help me in what I'M looking for (less lower end* More mid-upper end) I'll post my results soon as I need to put the Roller Rockers on and finish the manifold first. What do you guy's think about my rpm and what will happen to it?



[This message has been edited by MATEOZ28 (edited May 19, 2001).]

 

Lets say I lose 20-35 foot lbs of torque, is that really that bad when I already have just under 500 foot lbs? If I'm raising the mid and upper rpm's isnt it a better trade off?

 

I really don't have any evidence to support this, but I think that if your traction problems are that bad, your mods should help you. You have the cubes there to need the bigger TB and the larger intake area. You also have the massive torque that should still be effective with the loss of some low RPM intake velocity. Sounds like a plan to me!! BTW, are you running a stall converter and if so, what RPM?

my $.02

Laterzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

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Matt

1987 GTA L98 MD8 GW6

"Stop Lights timed for 35Mph are also timed for 70Mph"

 

Actually I have a 24-2800 stall.

Here are my other mods:
450HP *crank* 383 STROKER dynoed with stock TPI setup and no Roller Rockers.
All the freebies
1.6 Crane Gold Roller Rockers
TPIS Big mouth manifold ported
SLP runners extrude honed
24-26lb injectors
Holly in tank fuel pump
SLP 1 3/4 coated headers
3 1/2" header back exhaust
4thgen 1998 WS6 rearend w/323's
Competition Engineering adj. drag shocks
Custom LCA's
Eiback drag springs with airbag
Lakewood adj. panhard rod
Energy suspension polyurithane everything
Stage 3 700R-4
SLP 24-2800 stall
17x9.5 front ZR-1's
17x11 rear ZR-1's
powder coated white
With Dunlop SP2000 tires
Phantom Fuel pressure/tranny temp guages on dual pillar.
Hotchkis tie rod sleeve
KYB front rear sway bars
ASCD SS Hood
SSM subframe connectors
Edelbrock Strut Tower Brace
Throttle body airfiol
AFPR TPIS
MSD 6A box
MSD 8.5 Super Conductor wires
MSD High Vibraton Coil
Ported plenium
Flowmaster muffler *not sure what model*
Low temp fan switch
Low temp thermostat
Tranny cooler
Oil cooler
Goodyear Hi Miler cooler hoses
200 NOS kit *not installed til I learn about this **** though*
Skulte wheel spacers in front
Modified airbox
Lakewood drag struts 90/10's
V-6 springs in front
Hypertech underdrive pully's
K&N filters <---100HP @ least right there)
Accel cap rotor
Accel ignition module *I think thats what it is*
RedLine synthetic fluids, and water wetter cooling ****.
4 wheel disc
Several custom proms made by Performance Resource
AIR CONDITIONING from a donor car
I know I'm forgetting alot of ****.
I'm hoping for mid high 13's because my car weighs about 4000lbs




[This message has been edited by MATEOZ28 (edited May 19, 2001).]

 

If your car is only running mid to high 13's im gona have to come over and smack you around for a while. Buy some slicks and hook up, at least some drag radials. My car is running 13.8 on a stock motor (rebuilt, but built to stock) you better be dipping mid 12's at least.

------------------
1988 IROC-Z L98
License Plate: STG KLR 1
Engine Mods:
Edlebrock TES Headers, Hypertech Chip, Flowmaster Muffler, Intake Airfoil, Removed MAF Screens, MSD-6A, MSD Blaster 2 GM Coil, bored .030 over, Other minor mods
Suspension Mods:
Lakewood Traction Action Lift Bars, Hal Rear Shocks
Trans Mods:
2,500 stall converter, Redline clutches,Heavy Duty Steels, Trans-Go reprograming kit , Heavy Duty 2-4 band, Corvette Servo, B&M Mega Shifter w/ Carbon Fiber Handle (looks sweet in a black car!)
ET: 13.833@99.30

"If you can put it on your car, its fair" Quote By Guido
Foundering Member of the Illinois Overkill Crew (IOC)
www.mfba.org

 

Actually my car weighs about 3800lbs but I'll fix that soon

[This message has been edited by MATEOZ28 (edited May 19, 2001).]

 

Weight is definetely an ET/MPH killer. I've got a heavier than stock IROC-Z (lots of stereo, subwoofer box and over 100 pounds of dynomat) and the weight burden really slows the car. I had a buddy ride down the local 1/8 mile with me (he is around 275 pounds or so). The car slowed nearly three MPH trap speed.

<hr>
I noticed you have SLP runners but you didn't say anything about siamesing them further.

Remove all of the septum from the runners for their entire length. Remove material until the two round passages in each runner leg is just one large oval port. The set currently on my IROC have been done that way. You will pick up even more flow and power on the mid/top end. That will increase flow to the base, do to less turbulence & restriction + it increases plenum volume which will help feed the base at mid to higher RPM and softens low RPM torque some

------------------

Tracy /AKA IROCKZ4me
'86 IROC-Z Camaro
"Cogito ergo zoom"

• 355 cid
• AFR heads
• Arizona Speed & Marine hydraulic roller cam w/ AFR hydra-rev kit
• modified SLP runners
• TRW forged pistons/ceramic coated
• fully balanced
• Edelbrock headers/ceramic coated
• SLP cat-back
• Paxton supercharger
• Nitrous Express nitrous oxide

EFI Performance Club on Yahoo

 

There has to be a point where fuel from one injector is reversioned back up into the shared pair and eaten by the other cylinder causeing a lean/rich cylinder mismatch.....

I worried about this so I only took it about 2 inches or so in.

 

That shouldnt be a problem, because of the runner length in the base itself is of sufficient length. Everyone I have talked to that has done this has seen the expected results of lowering some low end torque, and raising their RPM wall.

Of course, we are talking about 383-406ci engines....which are torque monsters to begin with.


------------------
Mike Metzler (Desert86Roc)[*] Webmaster: SpeedWorldMotorplex.com[*] Click Here For 86 IROC 305 TPI (406 build in progress) Page

ET's @ 1250 ft[*] 14.28 @ 95.461 mph (uncorrected, NOS, no headers)[*] 15.365 @ 86.785 mph (uncorrected, headers, no NOS)
<><

[This message has been edited by Desert86Roc (edited May 21, 2001).]

 

I'll definatly be siamesing the runners as well. I was planning on doing that but didnt mention it. My car weighs alot from my stereo also, but there is no way to describe how it feels to turn up the stereo to it's almost 148DB range with some awsome music telling you it's OK to drive fast


Anyway am I bieng to frugal with my possible ET's? I seriously dont know what to expect from this car.