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L98 vs. LB9 TPI

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Old Aug 14, 2007 | 08:08 AM
  #1  
gcgarner's Avatar
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From: Morganton, NC
Car: '92 T/A WS6 Vert/1956 Chevy Nomad
Engine: 350 TPI
Transmission: 700r4 w/ Transgo Kit
Axle/Gears: 3.42 LSD
L98 vs. LB9 TPI

Is there any difference? I am thinking of buying a L98 out of a C4 Vette. I would like to use my current TPI (since I have it polished) and sell the other TPI. If there is any difference, what is it? Thanks!
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Old Aug 14, 2007 | 08:36 AM
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: L98 vs. LB9 TPI

You should be fine.
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Old Aug 14, 2007 | 08:44 AM
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From: Rhode Island
Car: 1989 GTA
Engine: 355 with Super Ram
Transmission: 700R4
Axle/Gears: 3.73 10 bolt with a True-trac
Re: L98 vs. LB9 TPI

only thing you need to keep from the L98 are the injectors.
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Old Aug 14, 2007 | 11:06 AM
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From: North Central Indiana
Car: 86 IROC
Engine: 383
Transmission: TKO 600
Axle/Gears: 3.54 Dana 44 IRS
Re: L98 vs. LB9 TPI

and you'll need a custom chip to run the bigger injectors. go to www.lsracingchips.com for a good chip for a good price.

You'll need to run your F-body fuel rail since the corvette one feeds from the opposite side.

You also cant run the corvette oil pan and oil pump pickup because it will hit your Y pipe.

You'll also have to route exhaust gas from the passenger side manifold/header into the back of the intake base if you plan on running EGR with the stock corvette intake base. If you use your f-body intake base you cant use EGR at all since vette heads dont have an exhaust crossover.

I can't think of anything else right now........

Last edited by 1MeanZ; Aug 14, 2007 at 11:10 AM.
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Old Aug 14, 2007 | 12:52 PM
  #5  
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Re: L98 vs. LB9 TPI

Different user, similar question for clarification. So ifI were to get a stock L98 block, I could use all of my LB9 components? Throttle body, runners, exhaust manifold, etc? Of course I would need the L98 chip, and bigger injectors as stated above. What size injectors does the L98 use, are they 24lb or are they still smaller than that? Thanks in advance.
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Old Aug 14, 2007 | 11:04 PM
  #6  
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Re: L98 vs. LB9 TPI

L98 is/has 22 pound injectors.
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Old Aug 15, 2007 | 01:55 PM
  #7  
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Re: L98 vs. LB9 TPI

would 25 lb injectors work also?
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Old Aug 15, 2007 | 02:00 PM
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From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: L98 vs. LB9 TPI

With chip tuning.
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Old Aug 16, 2007 | 09:08 PM
  #9  
1991CamaroRslow's Avatar
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From: Cincinatti OH
Car: 1991 L03 700r4 RS
Engine: 1987 WS6 Trans AM Lb2
Transmission: Th350 red neck Performance 3k stall
Axle/Gears: 95 Mustang 8.8 built with 3.73s
Re: L98 vs. LB9 TPI

25, 19, 21 pounders will all work without tuning just not very well. If you keep the 305 ecm keep your stock injectors and turn up the fuel pressure; I however would program a new prom chip for the engine with whatever injectors you buy.
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