TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Old Mar 23, 2003 | 08:45 PM
  #1  
BlackBeast'88's Avatar
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From: Odenton, Md
Car: '88 Formula
Engine: 355cid
Transmission: T-5
What to Do??

Need some help on my next performance enhancement. I have a '88 formula with the following mods;

L98 bored .30 over
FLOWMASTER EXHAUST-
3-in DIAMETER PIPE
custom prom (Breathless performance)
AIRFOIL/PORTED PLENUM-
K&N AIRFILTER-
EDELBROCK-HEADERS
SIAMESED RUNNERS
DRIVE PULLEYS
FUEL PRESSURE-REG
CompuCam .510/.510
TFS twisted wedge heads

I would consider the stealt ram (SR) but I'm worried about the hood clearance and the emission aspect so that is out. Let me know what you guys suggest as my next major enhancement.

I have been dyno'd at 260rwhp but know there is more there. I didn't have a smooth arc on the dyno.

L8R

BLACKBEAST
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Old Mar 23, 2003 | 08:56 PM
  #2  
c4boom's Avatar
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From: concord New Hampshire
Car: 87 iroc and 88 k2500 tbi truck
Engine: l98 and lo5
Transmission: 700 r4's babby
i know your not going to want to hear this but you will need to get in to prom burnig. that way you can smooth out that arc and pbly gain 20 or more horse. that and get a better base for that intake the stock one is killing you
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Old Mar 23, 2003 | 09:28 PM
  #3  
BlackBeast'88's Avatar
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From: Odenton, Md
Car: '88 Formula
Engine: 355cid
Transmission: T-5
c4boom- what would you suggest for a better base? Big mouth manifold or what? Thanks
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Old Mar 23, 2003 | 10:10 PM
  #4  
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From: concord New Hampshire
Car: 87 iroc and 88 k2500 tbi truck
Engine: l98 and lo5
Transmission: 700 r4's babby
there all about the same but for the price the big mouth is hard to beat

with a new base and some work on the prom you would be over 300 pbly

Last edited by c4boom; Mar 23, 2003 at 10:13 PM.
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Old Mar 23, 2003 | 10:34 PM
  #5  
BlackBeast'88's Avatar
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From: Odenton, Md
Car: '88 Formula
Engine: 355cid
Transmission: T-5
Are we talking personal experience or what? Just want to be sure because I was thinking about going with the big mouth from TPIS.

The Beast!
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Old Mar 23, 2003 | 10:35 PM
  #6  
IROCZ88x's Avatar
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From: marlborough/dartmouth, MA
Car: 1988 IROC-Z
Engine: LB9
Transmission: 700R4
maybe u should look into the Accel super ram...i dont have a 350 but i think it looks like a good option..a little pricey however
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Old Mar 24, 2003 | 12:51 AM
  #7  
D Stroy H8's Avatar
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From: Las Vegas, NV
Car: 1990 Iroc-Z
Engine: L98
Transmission: 700R4
Oof the SR is crazy expensive!

Grab a new base. How many runs did you get in on the dyno? You might benefit from testing and tuning the AFPR as you might not have ideal fuel pressure. Never heard of breathless before -Did they burn an actual prom or this some off the shelf crap?
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Old Mar 24, 2003 | 12:54 AM
  #8  
280Z28's Avatar
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From: Katy/Houston/UT Austin
I picked up over 40 hp by siamesing my runners and base. All for $40 in gaskets and cutting bits.
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Old Mar 24, 2003 | 09:15 PM
  #9  
BlackBeast'88's Avatar
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From: Odenton, Md
Car: '88 Formula
Engine: 355cid
Transmission: T-5
I made 3 passes on the dyno. The last one being the best. Breathless performance is a shop out of FL but they don't burn custom proms anymore. I guess I can't port my SLP runners any further can I?? I guess I'll have to go with TPIS big mouth manifold unless someone else can suggest more mods.

The BEAST!!!
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Old Mar 24, 2003 | 09:33 PM
  #10  
c4boom's Avatar
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From: concord New Hampshire
Car: 87 iroc and 88 k2500 tbi truck
Engine: l98 and lo5
Transmission: 700 r4's babby
that base is your big plug in power at the moment
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