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TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.

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Old 03-24-2007, 10:10 PM   #1
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sluggish on bottom rpm

i have a 89 305 tpi its an iroc but i have been having problems on the bottom end the response is off a little from 1000 -3000 it idles funny but when i take off as soon as i hit 3000rpms its like a new engine anybody know whats wrong
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Old 03-25-2007, 04:25 PM   #2
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Car: 89 GTA Nighthawk
Engine: 389 CID Vortec TPI
Transmission: TCI 700R4 w/Vigilante

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Re: sluggish on bottom rpm

Look for a vacuum leak. Check TPS setting.
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389 CID Vortec TPI Engine, 428 HP, 507 TQ. Wheeler Vortec Heads, KB, Comp Cams, Crane, Eagle, SLP, Accel, Fluidamper, Vigilante, TCI, Spohn, Lakewood, Hedman, Flowmaster, Random Technologies, Be-Cool, Granatelli, Goodyear, Bosch, SDPC Intake, Texas Speed, Custom Chip and Ford Motorsport (30 lb Fuel Injectors).
11.894@114.3 mph.
Sacrificed to the God of Speed: (2) 700R4's, 3 TC's, 3 sets u-joints, one driveshaft, one camshaft, one bent rod, 3 blown head gaskets and two blown motors.
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Old 03-25-2007, 04:25 PM
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