TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

whose got a tbi from hell?

Old Sep 6, 2004 | 10:32 PM
  #1  
1992rs/ss's Avatar
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From: Munster IN
Car: 92 RS, 05 GTO (sold), 10 TL AWD
Engine: 383 HSR w/DSC1
Transmission: 700r4
Axle/Gears: Strange S60/3.73
whose got a tbi from hell?

ok just curious, who here has the biggest, tire smoking tbi combo on the board, lets hear some specs and numbers.
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Old Sep 6, 2004 | 10:35 PM
  #2  
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Pablo has the fastest car physically. Dewey, Chuck and a few others should be running similar times pending funds and some down time permit wrenching, tuning and track time. My car is in peices now so I am out.
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Old Sep 7, 2004 | 06:00 AM
  #3  
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From: Portland, OR www.cascadecrew.org
Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
I'm going to cheat though, i've got nitrous
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Old Sep 7, 2004 | 09:28 AM
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Car: Turbo Buick
Engine: 3.8 V6
Frmula88 has the quickest combo I know of off hand.. low 12s

course its holley 4di
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Old Sep 7, 2004 | 10:12 AM
  #5  
Gunny Highway's Avatar
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From: The nation's capital
Car: 91 RS
Engine: 350 TBI
Transmission: 700R4
Yeah, from what I've read, I would say Pablo too. Although I'm working on catching him.
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Old Sep 7, 2004 | 10:30 AM
  #6  
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From: Portland, OR www.cascadecrew.org
Car: 1990 Camaro RS
Engine: Juiced 5.0 TBI - 300rwhp
Transmission: T5
Axle/Gears: 3.42 Eaton Posi, 10 Bolt
there are others who are doing pretty well. Jon Prevost was solidly in th 13's IIRC, if you look at the TPI regestry, there are plenty of good times, I'm only #25 right now.
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Old Sep 7, 2004 | 12:37 PM
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From: wisconsin
when new cam tuned-watch out.
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Old Sep 7, 2004 | 02:59 PM
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From: west michigan
Car: 89 RS
Engine: lo3
Transmission: 700R4 w/ B&M shift improver
Axle/Gears: 3.27 9-bolt posi
25thrss should be pretty fast. Last time i read he was planning on running alot of juice.

-chuck

btw, i just read your sig, where do people find those trenz billit grills? those things are sexy and last time i pm'd someone about it i never heard back. I'll pm you too, but incase you dont check those, email me ssxmac@hotmail.com

Last edited by ssxmac; Sep 7, 2004 at 03:01 PM.
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Old Sep 7, 2004 | 03:02 PM
  #9  
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From: Quad cities IL
Car: 96 s-10, and 89 camaro RS
Engine: 305 TBI with alot of mods
Transmission: 700R4 B&M shift kit
where is this TPI registry? Also how do i get added? I currently have a best of 14.9 but have spray now and SHOULD be in the high 12s or low 13s.
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Old Sep 7, 2004 | 03:47 PM
  #10  
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Car: Turbo Buick
Engine: 3.8 V6
he meant TBI registry, and there are a few CFI cars running much harder than mine, take ben or Tom 400 cfi for instance
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Old Sep 8, 2004 | 03:17 PM
  #11  
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From: florida
Car: 1992 camaro rs
Engine: 346 ls1
Transmission: t56
Axle/Gears: strange 12 bolt 3.73's
ive got you all beat lol 16.3 hahaha
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Old Sep 8, 2004 | 07:49 PM
  #12  
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From: Red Deer, Canada
Car: 89 Shortbox
Engine: 350 Vortec
Transmission: 700r4
Why do you care about TBI, you've got a super-ram.


Theres lots of guys that have built tbi motors, that would make 400hp with a nice big carb on top.
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Old Sep 11, 2004 | 10:08 AM
  #13  
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From: Morris, IL
Car: '91 t-top RS; '91 hrdtp Z28
Engine: LO3;383tpi
Transmission: 700r4;very nice 700r4
Axle/Gears: 4.10 zt posi, 3.70 auburn
I ran a 13.4 @ 106mph on a generic(ballpark range) chip. Then I swapped out the performer intake for an rpm airgap and a new chip. My first run with the combo yielded a shattered clutch, but on the up side I was .4 sec ahead of an LS1 z-28 at the 330' mark. He went on to run a 13.6.

I consistently beat my buddy's 12.7 sec mustang, and would guess I was at 400hp. Unfortuantly, the engine blew and I never had a chance to run at the track after I swapped clutches.

TBI is not hard to work with or make fast, especially if I could do it. You do not need to replace the 2bbl tbi with a big 4bbl carb either. With tbi, proper plenum is very important and is the key to delivering air to the engine, though the effects are different then with a carb to a point. My single largest gain was swapping out the performer intake with a 1/2" closed adapter plate to the rpm airgap with 1" open adapter plate. However, fuel delivery can become a problem, not so much due to lack of, but more so atomization.
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