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

Bigger TBI Throttle Body?

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Old Oct 2, 2006 | 02:16 PM
  #1  
XxGeinNothingxX's Avatar
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Car: 1991 Camaro RS
Engine: 350 bored .30 over
Axle/Gears: Posi 342
Bigger TBI Throttle Body?

I was maybe thinking of stepping up to a larger body. Does anyone have a opinion or think its worth the money, I mean, I am sure it will help on down the road with nice work done, but what about now.
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Old Oct 2, 2006 | 08:24 PM
  #2  
Casey Butt's Avatar
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From: Troy, MI
Car: 1988 IROC-Z TBI
Engine: L04.3 = 305-310-336
Transmission: TH-700R4
Axle/Gears: 10-bolt, 3.42 posi
It depends on the other mods that you have done to the motor and exhaust. A stock L05 isn't really "air limited" by the Rochester 220 TBI, so in that case you wouldn't notice much difference. If you also moved to a more "freely" breathing intake element at the same time you might notice that your car picks its revs up quicker and breathes a little better up top ...but nothing dramatic because of the bigger TBs on a mostly stock 350 (or 305).

If you make other mods that allow the engine to demand more air (exhaust, heads, cam, etc) then you'll notice a bigger jump.

In any case, it shouldn't do any harm. I stuck a CFM Tech ported TBI (with bigger TB valves) and an open element air filter on a mostly stock L03. I did notice that the engine climbed up the revs quicker and was clearly less restricted up top, but I doubt that there was a dramatic increase in power simply because the stock exhaust is so restrictive ...there was no loss in mileage or bottom end, if that's a concern.
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Old Oct 3, 2006 | 02:35 PM
  #3  
XxGeinNothingxX's Avatar
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Car: 1991 Camaro RS
Engine: 350 bored .30 over
Axle/Gears: Posi 342
Ya, my car is pretty much stock I would say. I have full exhaust, open air element, and larger injectors, so you think I should hold off on the body?
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Old Oct 3, 2006 | 03:54 PM
  #4  
Casey Butt's Avatar
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Joined: Jun 2006
Posts: 307
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From: Troy, MI
Car: 1988 IROC-Z TBI
Engine: L04.3 = 305-310-336
Transmission: TH-700R4
Axle/Gears: 10-bolt, 3.42 posi
At this point you'd getter more bang for your buck from other mods ...cam, heads, etc. ...of course, depending on the cam and head flow, then you might need the bigger TB, but I wouldn't consider it a necessity yet.
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