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April 3rd, 2006, 06:22 PM
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70mm throttle body and throttle
has anyone come up with a solution yet for the difference in air flow with a 70mm throttle body since it flows more for a given tps value. Wide open throttle is no prob, but anywhere between that and idle it seems like computer confused and hesitates.
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87 Grand National w/ T-Tops - TA-49 , 009 injectors, 70mm Precision throttle body and plenum with RJC power plate , Hooker equal length headers , Hooker 2.5" Cat back, 3" Downpipe , Red Stripe Converter , Alky injection , turbotweak alky chip , self ported intake manifold with tower removed. DRIVE IT LIKE YOU STOLE IT !!!!!!!     
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April 4th, 2006, 11:40 AM
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70 mm
Do you have a popping at about 1/2 throttle when you stab the throttle fast?
If you slowly ease into it, it doesn't seem to happen?
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1987 TURBO T Orig owner  might sell 2006 IBM GTO 1 of 115 made 
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April 4th, 2006, 11:57 AM
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most guys that make chips can compensate for that.
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Race Jace, Jason Cramer RJC Racing The leaders in Performance Buick Product Developement. Click here to e-mail RJC Racing 1st ever 9 sec TSM car!! 2002, 2003 & 2004 GSNats heads up TSM class winner 87 GN TSM Street car 9.63@141 RJC Girdled stock block,200 trans, RJC A.D.Power Plate-p, full interior, cold A/C, with lil Jace's GN carseat in the back! New best 6.05 @ 113 1/8mi at 2007 West coast nats in Phoenix. (To bad I did not get a chance to run the whole 1/4 at this event....)
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April 4th, 2006, 06:00 PM
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no popping, its just more like the computer gets confused and hesitates.
I got a chip from eric which I thought I mentioned about the 70mm.
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87 Grand National w/ T-Tops - TA-49 , 009 injectors, 70mm Precision throttle body and plenum with RJC power plate , Hooker equal length headers , Hooker 2.5" Cat back, 3" Downpipe , Red Stripe Converter , Alky injection , turbotweak alky chip , self ported intake manifold with tower removed. DRIVE IT LIKE YOU STOLE IT !!!!!!!
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April 4th, 2006, 06:11 PM
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Like Jason said, I think the only way to properly take care of that is with a chip. The computer is looking for, if air mass=A, throttle position should = B and O2 should = C. Then D (pulse injector width or whatever) should equal X. A and C dont = B and dont come close to matching and the computer doesnt know what to do. Not the most technical answer but you get my drift. Its like running a #28 accelerator pump nozzle (for a 600CFM holley) on a 750CFM Holley which should have a #31 pump nozzle. A bigger and faster pressure drop requires a bigger and faster pump shot of fuel.
Last edited by VadersV6 : April 4th, 2006 at 06:13 PM.
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