305 tpi 350 tpi are they the same.
Thread Starter
Junior Member
Joined: Jan 2002
Posts: 11
Likes: 0
From: Long Island, New York
Car: 1989 Iroc-Z
Engine: 305 TPI and as of now bone stock
Transmission: T-5
Axle/Gears: Little Ones
305 tpi 350 tpi are they the same.
hay im looking to swap my 305 for my friends 350. I have a t-5. Becideds the chip is there any other diffrence. Can i still use my exsisting Tpi unit? And does anyone have any sugeestions for a chip being that it will know be a 350 w/ a 5speed. I made a auto 350 into a stick last year and had no computer problems but know im upping the the motor. Anything anyone can think of please let me know
Joined: Mar 2000
Posts: 43,187
Likes: 43
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 aboard.
Have you checked the TPI forum? Searching there will probably yield better information than here.
The basics, as I understand them:
'85-'89 are MAF systems. The '89 was unique with the elimination of the cold start injector, supposedly possible due to improved PROM programming. 350 '87-'89 had slightly different timing tables, from what I understand.
'90-'92 are SD systems. PROM tuning is critical with any change to displacement or flow (cam change, for instance).
In all cases, 305 TPI used 19 lb/hr injectors, 350 used 22 lb/hr injectors. 305 and 350 have different knock sensors.
Other than that, the base, runners, plenum, throttle body, fuel rails, etc., etc., etc., are identical for any given year regardless of whether 305 or 350.
Starting with 86-1/2, Vettes used aluminum heads and the base was different because the aluminum heads don't have the exhaust cross-over passages.
Have you checked the TPI forum? Searching there will probably yield better information than here.
The basics, as I understand them:
'85-'89 are MAF systems. The '89 was unique with the elimination of the cold start injector, supposedly possible due to improved PROM programming. 350 '87-'89 had slightly different timing tables, from what I understand.
'90-'92 are SD systems. PROM tuning is critical with any change to displacement or flow (cam change, for instance).
In all cases, 305 TPI used 19 lb/hr injectors, 350 used 22 lb/hr injectors. 305 and 350 have different knock sensors.
Other than that, the base, runners, plenum, throttle body, fuel rails, etc., etc., etc., are identical for any given year regardless of whether 305 or 350.
Starting with 86-1/2, Vettes used aluminum heads and the base was different because the aluminum heads don't have the exhaust cross-over passages.
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