3rd Gen / L98 Engine Tech 1982 - 1992 Engine Related

TBI bolt on question or whatever

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Old Mar 31, 2005 | 09:14 PM
  #1  
badasschevy625's Avatar
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From: plymouth-canton, Michigan
TBI bolt on question or whatever

hey my buddy just bought an 89 rs and he or me has never play around with one of these motors so i am just wondreing what are some basic bolt ons or some easy **** to do to throw him inot the 13s or so or is this hard to do thanks let me know

chris
Old Mar 31, 2005 | 10:08 PM
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cc89formula's Avatar
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From: Amarillo TX
Re: TBI bolt on question or whatever

305 or 350? TBI? if its a 305 its junk dont bother. If its a 350, its junk but you can work with it. TBI sucks so I would carb that thing. After you carb it, it should be pretty easy to figure out how to get HP.
Old Apr 1, 2005 | 06:26 AM
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badasschevy625's Avatar
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Re: TBI bolt on question or whatever

ya man i know its garbge but my buddy just wants it so he doesnt get embrassed by like a mini van lol and does carbing it really help that much
Old Apr 1, 2005 | 08:45 AM
  #4  
92'RS-DFI's Avatar
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Re: TBI bolt on question or whatever

I had a 305 tbi in my car before I switch motors. I got it running 14.89's. It's hard to mod a tbi car. If you want it fast and want to do it cheap go carb or TPI setup. I still have the motor and it was strong just not fast!
Mods on 305
4.10 gears
3200 converter
shift kit
long tube headers
mufflex 4in header back system
I never had a bolt of the motor. I think a big cam and some computer mods would get you where you want to go.
Old Apr 1, 2005 | 11:55 AM
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Chrome383Z's Avatar
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From: Shelbyville, IN
Re: TBI bolt on question or whatever

You need to cut a hole in the floor so you can go to TRUE WOT, been saying this for years... *no one listens**sigh**
Old Apr 1, 2005 | 12:18 PM
  #6  
cc89formula's Avatar
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Re: TBI bolt on question or whatever

Originally Posted by badasschevy625
does carbing it really help that much
IMO yes, because a carb is much easier to tune and you can do away with the computer stuff. I think with the right manifold and carb you could pick up maybe 45 hp. Maybe im a little over on that, but I really think the TBI holds you back. If my car werent TPI I would go carb, but I love the torque the TPI motor puts out.
Old Apr 1, 2005 | 03:28 PM
  #7  
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From: Cincinnati, OH
Re: TBI bolt on question or whatever

TBI isnt limiting the car from the factory, its the heads and cam. I wouldnt touch the engine, just do a full exhaust, posi, 3.42s (A4) or 3.73s (T5), ~2600 torque converter (if A4), open element air cleaner, subframe connectors, lca's... It'd be a 14.8-15.0 car which isnt exactly burning up the street, but it'd be ok. To see low 14s or high 13s you'll need heads and a cam, which requires tuning. Regardless, a good dyno session and used 350 injectors wont cost much more than a carb and you'll keep the drivability of FI. A carb is nice if you do heads/cam and really dont want to have someone tune it or take the time to learn it yourself.

Or do the above mods and put a 100 shot on and up the fuel pressure. He'd be where he wanted. I'd probably step up to some 350 injectors though just incase.
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