6L.IROC-Z

iTrader: (6)

Have any of you guys had expeirence setting a timing curve for a carbed setup? The curve i have in the car now is at 36* at 6000-6900 rpm.the spark plugs show no signs of detenation at 36* i want to play with the timing some but how much is to much 38*,42*? the track is closed and a havent made it to the dyno yet. knock is hard to detect with no knock sensors and loud exgaust. any info would help me out

Project GatTagO

iTrader: (7)

I doubt you will see any huge gains by bumping the timing past 36 degrees.

Andrew

dynocar

You seem a little agressive on timing, on a given head a carb application will not accept as much timing as an EFI application due to a carb's greater cyl to cyl fuel distribution problem. Your 36* would be right in there on the old '60s' iron heads but on todays fast burn combustion chambers, 24-28* is where we would want to be with EFI. The most timing you can run does not usually equate to the most power. Just my opinion of course.

Doc

iTrader: (9)

I applaud your experiment. We recently slapped a 5.3 truck motor with the Vic Jr. Intake, holley carb, 224 cam, p/p/ozv heads combo on a 83 foxbody. We used my old 98 pcm to control spark and kept the knock sensors hooked up to set the spark. We ended up with about 32 @ WOT. Ofcourse we had EFI Live and a LC-1 to back up everything else backed up by the dynojet. Bottom line get some instrumentation and the guessing is gone. More power to ya!
Now how about a intake elbow, TB, and fuel injection rails to up the ante and really spank some unsuspecting folks with your camaro?

jimmyblue

iTrader: (11)

Or go the other way and see if that GMPP fuel pump /
HEI adapt-em-up kit ever made it to retail... back to
the good ol' days of 1 wire engine management
If it doesn't have to run the injectors there's only
8 reasons left for all that wireball and fussiness.

30 degrees, all in by 3000 is the old school SBC rule
of thumb I think.

6L.IROC-Z

iTrader: (6)

doc I totally agree with you instrumentation = no guessing. so 36* is problably my best bet till i get it on the dyno and/or at the track.dynocar i had the same thoughts as you at first i pulled up my buddys tune in his 99 m6 with a g5x2 and it was at 29* so thats what i put tuned in to msd box,went for a drive and it felt like i had a gooseneck trailer hooked to the bumper,iput the 36* back in it and it felt a lot stronger.so that got me wondering 36* is good! is 38* better? i agree with you too more timing dosnt allways equel more power. thanks for your input

ty_ty13

iTrader: (42)

i believe your the guy that runs the cheap street at jackson right? fast car! mine wont be in that class but it will be in some of the "King of the Street" races...

you ran some 5.8x didnt you?

i may see you around..

6L.IROC-Z

iTrader: (6)

no, thats not me. but ill take the 5.8x. my car has only been together for about 5 weeks now.