DIY PROMDo It Yourself PROM chip burning help. No PROM begging. No PROMs for sale. No commercial exchange. Not a referral service.
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So I've been tuning my car now for 1.5 years, have it running pretty damn good. I'll start by saying yes I've searched but still have some general questions, used to chat with Grumpy when he was alive (damn I wish he was still around now that I know more about what I'm asking). I still have a general basic question though:
So my tune is giving my motor Id guess what it wants because of the performance however, in general. A v8 SBC wants a fair amount of timing from idle to about 3000, then a spark map would be at max spark after 4800rpm. The anamoly being at cruise (1400-2000rpms / <30kpa) around 40degrees total.
The trouble I'm having is 1. am I right in my general thought and 2. I can't get rid of a bit of ping around 2000-2500 33-50kpa map pressure
I'm runnin no blower at the moment, a HSR intake, 58mm TB, 60# injectors, hooker 2210's, Dart Pro1 Alum heads (64cc / 200cc) 1.5 Harland sharp RR's and a Comp Cam: Lift: .520int/.540exh | Duration: 288int / 315exh | 113LSA
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1991 1LE 46K miles, 383 forged Eagle rotating assembly, Procharger P1SC, Dart Pro1 alum heads, 64cc/200cc,Harland Sharp 1.5 RR's, Comp Cam (Duration I:.520/E:.540 Lift I:236/E:248 113LSA), MSD 8336 Distributor, MSD 6+ Digital spark box, Holley HSR, 60# injectors, Hooker 2210's, Mufflex 4" catback,58mm BBK TB, Tremek TKO600, Spec Stage 3 clutch, Strange 12bolt w/3.73 gears, Spohn SFC,Spohn solid rear swaybar, Spohn LCA's, Spohn Adjustable TA, Denny's Nitrous Ready Driveshaft, $59 code, custom tune.
327rwhp / 485ft-lbs @5PSI boost. Both numbers having the timing 12 degrees retarded from where the timing needed to be. Re-dyno soon.
Last edited by AC; 06-28-2009 at 02:51 PM.
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new symptoms have developed since that last post and I'm leaning more towards the distributor taking a dirt nap or being off a tooth or two on the cam.
The car has now 3x times over the last 500 miles just died in the middle of crusing. I come to a stop, key on and ALL looks good every one of the 10 guages I have in the car. I go to start it and BANG!! The backfire is so bad you'd think someone just lauched a TOW missle or set of a M100. Then car just cranks and cranks and cranks, no fire.
I'm ordering a new MSD or Mallory distributor and digital ignition box this week as well.
