right now its at 6*, stock setting..should i advance it or retard it,, what should i do with it with my mods,, thanks
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1988 GTA Trans Am 350tpi: 42k miles,3:27 BW rear, aftermarket t-tops
Hotchkis: subframe connectors & strut tower brace
Flowmaster: 3inch exhaust& dual chamber muffler
Accel: 8.8mm wires, ignition module, cap&rotor, u-groove spark plugs
Edelbrock: 52mmTB, intake & runners
K&N: filtercharger
TPIS: 170* stat, afpr, mat relocation kit
March: performance crank and alternator pulleys
Hypertech: 176* dual fan switch
Other mods: ported plenum, gutted cat, tb coolant bypass
Future mods: Edelbrock tes headers, transgo shift kit& corvette servo,1.6 roller rocker arms, flux capasitor(to make time travel possible)
CAR NOT RUNNING AFTER INTAKE INSTALL!!
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1988 GTA Trans Am 350tpi: 42k miles,3:27 BW rear, aftermarket t-tops
Hotchkis: subframe connectors & strut tower brace
Flowmaster: 3inch exhaust& dual chamber muffler
Accel: 8.8mm wires, ignition module, cap&rotor, u-groove spark plugs
Edelbrock: 52mmTB, intake & runners
K&N: filtercharger
TPIS: 170* stat, afpr, mat relocation kit
March: performance crank and alternator pulleys
Hypertech: 176* dual fan switch
Other mods: ported plenum, gutted cat, tb coolant bypass
Future mods: Edelbrock tes headers, transgo shift kit& corvette servo,1.6 roller rocker arms, flux capasitor(to make time travel possible)
CAR NOT RUNNING AFTER INTAKE INSTALL!!
Junior Member
I have mine advanced to 8 you could go with 8 - 10. I wouldn't go any higher than that or you might have a problem with the knock sensor/ ECM retarding your timing. It was a nice SOTP improvement over stock.
Member
When I was still TPI last year, I advanced from 6 to 12 degrees. On the G-tech, I gained 3 tenths. The ECM didn't seem to have a problem.
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91 Firebird Formula. Converted to carb. Holley 750. Forged Flat top pistons. 10.5 to 1 compression. ZZ-9 Cam. Ported L98 Heads.
150 shot NOS, 700r4 w/ 3000 rpm converter and 3.73s in the back. Headers w/ full dual exhaust. 27.5 inch McCrearys. (free slicks)
12.98 @ 106 Natural,
11.83 @ 113 NOS.
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91 Firebird Formula. Converted to carb. Holley 750. Forged Flat top pistons. 10.5 to 1 compression. ZZ-9 Cam. Ported L98 Heads.
150 shot NOS, 700r4 w/ 3000 rpm converter and 3.73s in the back. Headers w/ full dual exhaust. 27.5 inch McCrearys. (free slicks)
12.98 @ 106 Natural,
11.83 @ 113 NOS.
Ron,
With your cooler air charge, free-flowing exhaust, and improved intake, you're probably getting plenty of intake charge into the cylinders. Because of the pressure, I would keep the limit to no more than 10° with a stock PROM (stock timing curves). If you have a serial scanner, you can experiment with higher base timing until your knock counts start increasing and the EST begins retarding spark. Lacking the scanner, and presuming the timing marks are accurate, stay at 10° or below on pump gas.
BTW - I ran a 16.29 ¼ set at 12° BTDC and a 15.86 with 8° BTDC. Think my spark was getting retarded?
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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0
With your cooler air charge, free-flowing exhaust, and improved intake, you're probably getting plenty of intake charge into the cylinders. Because of the pressure, I would keep the limit to no more than 10° with a stock PROM (stock timing curves). If you have a serial scanner, you can experiment with higher base timing until your knock counts start increasing and the EST begins retarding spark. Lacking the scanner, and presuming the timing marks are accurate, stay at 10° or below on pump gas.
BTW - I ran a 16.29 ¼ set at 12° BTDC and a 15.86 with 8° BTDC. Think my spark was getting retarded?
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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0