I have HP Tuners and a friend of mine has a stock 03 5 speed Sunfire. He wants to know what the gains will be if I do it for him. Do any of you know? Thanks!

with something stock? pretty much nothing at all, tell him to spend that 450 on a TB and intake



1989 Turbo Trans Am #82, 2007 Cobalt SS G85

I think there are gains to be had, just playin with the spark tables gave my car a lot more power. Problem is nobody has tuned then dyno'd a stock car, so we can't really put numbers on anything.





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how exactly do you mess with the spark tables , in the high octane just raise them by 1 until you get knock?



1989 Turbo Trans Am #82, 2007 Cobalt SS G85

Before you play with them, you have to set the low octane and high octane tables the same, for both the regular tables and the PE tables. Then do some logging to figure out where you have knock, then adjust the areas you don't have knock up a bit, and the areas you do have knock down.





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well the stock tables are not the same, the high octane has alot more advance across the board



1989 Turbo Trans Am #82, 2007 Cobalt SS G85

Thats the point, you are tuning the high octane table, removing knock, then setting the low octane table the same, removing a couple degrees accross the board in that table, then you should gain power.





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How much power are we talking here....ball park

with intake and full exhaust



I have one true love in my life...And my girlfriend sits next to me in it

hard to say nobody has dynoed baseline, then made a bunch of changes to an NA car and compared the difference, im not sure how much you can get out of spark advance alone



1989 Turbo Trans Am #82, 2007 Cobalt SS G85

i'm a believer u can prolly get like 10 more HP out of a stock tune. i wouldnt say anymore then that.



MY 2003 SUNFIRE 15.33@88.5mph

"A N/A ecotec is not gonna give Honda's and Mitsu's that much of a run for their
money unless their blown or bottle fed.GM is still smokin crack!"
~1QWKZ24
www.streetracing.org, 08/2001

is there any another indicator of to much spark advance other then knock? is there any potential preformance loss other then timing being pulled from knock being present from advancing the spark?



|Forged 8.9:1 Wiseco Pistons|Forged Eagle Rods|HPTuners|60trim|Tial Wastegate|
|Precision Intercooler|2.5" Exhaust|2.5" Charge Pipes|630CC Mototron Injectors|
|Stock: Fuel Pump, Transmission, Manifold, TB, Head, Head Gasket, Ignition, Suspension...|

Yes, Acer, you can lose performance by advancing timing too far w/out Knock, but yet, none of us know what that point is yet, eventually someone will figure it out with a lot of $$ and dyno time.


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15.149 @ 91.26mph 3-18-2006