I just installed my PR chip today. Tomarrow I am going to put in the 160* thermostat and advance the timing, but how far did you guys all advance yours? Now its set at the stock setting 6* below TDC, so what do u think, 12*, 14*, or more?

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission

Current Mods: Edelbrock TES Headers, Hooker Cat-Back System, Performance Resource Chip, 160* Thermostat, Accel 8.8mm Ignition Wires, K&N high flow air filters, gutted air box, gutted MAF sensor, Throttle Body Coolant By-Pass, Homemade Ram-Air, Falken ZIEX Z-Rated Tires.

1/4 mile times without chip:
Best ET: 15.7 @ 89MPH
Best Corrected ET: 14.5 @ 96MPH

 

Come on guys, I need help here!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission

Current Mods: Edelbrock TES Headers, Hooker Cat-Back System, Performance Resource Chip, 160* Thermostat, Accel 8.8mm Ignition Wires, K&N high flow air filters, gutted air box, gutted MAF sensor, Throttle Body Coolant By-Pass, Homemade Ram-Air, Falken ZIEX Z-Rated Tires.

1/4 mile times without chip:
Best ET: 15.7 @ 89MPH
Best Corrected ET: 14.5 @ 96MPH

 

Um....heh..i didn't advance mine...but from what the guy at PR told me it'll run fine with advances in timeing and he told me not to run anything colder than 170* thermo....

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89 IROC-Z 350 TPI

-Flowmaster Cat-back

-MSD 8.5mm Wires

-K&N AirFilters

-Ported Plenum

-Performance Resource Chip

Comeing:

-MSD GM Replacement Coil, and 6A or 6AL amp.

-Gutted Airboxes

-Edelbrock TES Headers

 

Actually, I had mine set at 6 degrees, then I went down the track and I ran consistent 14.3..... Keep that in mind...

I decided I wanted to see what the motor was running for timing at 3000 rpms. I found out I was at 42 degrees, with the computer advance Way to much..

So I set base timing at 0 degrees, and i rechecked the overall advance at 3000 rpms with the TPI and I it brought the total advance down to 36 degrees.

And then I took the car back down the race track.... I pulled of consistent 13.8's. That was a drop of half a second by less timing...

So the moral is:

More timing is not always better.


And yes, I did NOT have knock retard either going down the track the first time.... So let me put everyones mind at ease about that....

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Sportsman II 72 CC heads, Edelbrock 1 5/8" headers and Edelbrock cat back exhaust, hi-flow cats, Trans-go shift kit, SLP cold air induction, SLP roller camshaft, 24lb ADS injectors, AFPR, 3.45 rear end gears, and other goodies...

 

Raven is correct IMO, if you advance it too much you will get excessive retard from the knock sensor and kill performance. You should start with 6 deg and do a test run with a scan tool to determine ECM advance and knock retard. Then calculate total timing as follows:

Initial + ECM - KS Retard = Total Timing.

Aim to get that total timing figure at around 36 to 38 degrees.

I know someone who got their best results by setting initial timin to 3 degrees. They were running a TPIS chip, and a few mods on a 305 TPI. The car went 13.8 secs with 3 deg initial.

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1987 Chevy Camaro IROC-Z
1998 Ford Falcon XR8
My IROC-Z in Sydney, Australia.
Thunder Down Under home page.