Optimum timing on a ZZ4 crate
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Joined: Jan 2003
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From: Garibaldi Highlands, B.C., Canada
Car: '88 IROC Convertible
Engine: ZZ4 TPI
Transmission: 5 spd.
Optimum timing on a ZZ4 crate
What is the correct baseline timing?
New ZZ4 crate, TPI, Edelbrock Hi Flow Runners, TES headers, prom by Fastchips.
Thanks!
New ZZ4 crate, TPI, Edelbrock Hi Flow Runners, TES headers, prom by Fastchips.
Thanks!
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
The correct initial timing is set by whoever did the chip. It *should* be the same as a regular TPI, 6 degrees. Max timing at wide open throttle should be around 32-36 degrees, depending on what your engine responds the best.
Thread Starter
Member
Joined: Jan 2003
Posts: 217
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From: Garibaldi Highlands, B.C., Canada
Car: '88 IROC Convertible
Engine: ZZ4 TPI
Transmission: 5 spd.
Thanks Kevin, now here's what may be a dumb question but,...
The engine idles OK right now and is pretty much driveable, how much tolerance or leeway can (if any) can be compensated for by the ecm?
As I understand it the ecm pretty much controls timing.
The engine idles OK right now and is pretty much driveable, how much tolerance or leeway can (if any) can be compensated for by the ecm?
As I understand it the ecm pretty much controls timing.
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