How does this NA spark table look?
#1
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How does this NA spark table look?
I started tuning Johnwag's car today (9:1, Gibb header, ARTech intake, 949 clutch). Unfortunately the dyno went on the lam and stopped reading output properly so we had to cut it short. I bumped spark up until it "sounded" like it wasn't increasing power based upon "that sound" of spark advance and the time it took to spin the brake. We used the Polish Det-Cans and never heard detonation.
AFR is 13.1-12.6 @4000rpm+.
The spark "block" around idle is to help the 11lb flywheel situation...which is a pretty awesome situation. We're going to take the car back when the dyno is fixed to get a number.
edit: I cleaned up some amateur ****.
AFR is 13.1-12.6 @4000rpm+.
The spark "block" around idle is to help the 11lb flywheel situation...which is a pretty awesome situation. We're going to take the car back when the dyno is fixed to get a number.
edit: I cleaned up some amateur ****.
Last edited by hustler; 09-11-2010 at 11:28 PM.
#9
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Thanks, I'll reduce a few of those. Do you agree with 3* spark to drop down to 91-octane Oklahoma fuel?
I'm somewhat impressed with myself for getting it so close to where the professionals put it.
I'm somewhat impressed with myself for getting it so close to where the professionals put it.
#10
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Making hard and fast rules like that makes me uncomfortable. That's probably going to be too much timing for 91, but I'd rather not make a specific recommendation on how much timing needs to be pulled so much as I'd rather recommend tuning with the fuel that will be used.
#12
Damnit, I'm glad Damon pointed me to this thread. I didn't run this much spark angle on my 1.6 when I was tuning it, but did find a good bump in output going from ~28 to around 30* in power, this on 93 octane. If you ran this much advance w/o hearing det on the cans, I may add in more angle.
Trey, do you mind sharing target AFR tables that you were using? Good stuff, thanks again for sharing.
Trey, do you mind sharing target AFR tables that you were using? Good stuff, thanks again for sharing.
#14
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#19
Damnit, here I was starting to tune in the 12.8 range, then 13.2 and made more power. Now I see Oscar's targets all above stoic except all the way up top, wtf?
Oscar, what compression ratio are you running, and what are you fueling with? I'd bet I could make bigger power by continuing to lean it out a bit and giving it more advance.
Oscar, what compression ratio are you running, and what are you fueling with? I'd bet I could make bigger power by continuing to lean it out a bit and giving it more advance.