305tpi 350tpi
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Joined: Dec 2001
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From: il.usa
305tpi 350tpi
have a 91 camaro with 305 tpi/auto trans,would like to install 350 tpi, but do not have the injectors for the 350,will the 305 injectors fit? will i have to change the computer out or change the computer chip?
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Welcome!
The 305 & 350 TPI's are the same except for the injector flow and regulator pressure.
Quite a few guys are running a 350 under their 305 TPI by getting or making their reg adjustable. Higher pressure on 19 lb injectors will feed a 350 fine. In fact, I know a guy who has a ZZ4 that's heavily modified who runs better times with 19 lb injectors than he did with 24 lb! Of course, our altitude is probably making that possible to some extent, and he is using a custom PROM, but a more mildly modified 350 at sea level can be just fine with the 305 injectors.
You should be able to get by with the 305 chip until your modifications become more extensive. PROM burning is a good way to tweak more power out of a TPI, though.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
The 305 & 350 TPI's are the same except for the injector flow and regulator pressure.
Quite a few guys are running a 350 under their 305 TPI by getting or making their reg adjustable. Higher pressure on 19 lb injectors will feed a 350 fine. In fact, I know a guy who has a ZZ4 that's heavily modified who runs better times with 19 lb injectors than he did with 24 lb! Of course, our altitude is probably making that possible to some extent, and he is using a custom PROM, but a more mildly modified 350 at sea level can be just fine with the 305 injectors.
You should be able to get by with the 305 chip until your modifications become more extensive. PROM burning is a good way to tweak more power out of a TPI, though.
------------------
82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).
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