Where to set timing with 9psi powerdyne

[nails79]

just finished installing the 9psi powerdyne kit, several snags along the way nothing major. i set the timing at 6* before installation as per the directions, just wondering where i should be setting it now. i know every car is different but is it safe to go to the 10-12* range? (not that i can see the timing pointer any more) motor is a 306, lunati cam, gt40 y heads ported, 42# inj, 80mm maf, 255lph pump, cobra intake, had the timing at 16* when in NA form. the car is also rich as all hell at idle, i have the fuel pressure set at 36# with vaccum off, plugs gapped at .034", also car takes about 5 minutes to idle strong and properly it wants to stall out. thanks for any help.

[Jeff Chambers]

You don't say what PCM you have, which would tell me what kind of total advance is being commanded. The 9psi PD kits rarely make 9psi, usually more around 5 or 6 so at that point I'd be looking to retard the timing 3 or 4 degrees under boost; total timing probably around 27 to 29-degrees. This of course depends on what your compression ratio is in the motor. The car's going to run off-kilter until you get a tune on it. I'd find a dyno tuning shop in your area a make an appointment for a custom tuning session.

[nails79]

thanks for the reply, i'm running a stock A9L computer, no boost controller and 9.3-1 compression. i haven't beat on the car yet, shifted 2nd gear at 5300 and saw the boost gauge at 6psi, not sure how much more i can get out of it, kind of afraid to try with out a good tune. using msd dizzy, coil, and 6AL, definitely have enough for a good spark and more than enough fuel. so with all listed i should be able to set the base timing at 10* until car is dyno tuned??

[Jeff Chambers]

With the A9L and a base timing of 10-degrees, you'll have a total timing of 27-degrees by about 3000rpm. This should be safe if you are rich as described at 6 psi. Every car is different though so my real recommendation would be to pull a few extra degrees until you can get it on a dyno. Hopefully the shop you go to can actually datalog during the run using something like a SnEEC datalogger. That will let you see what kind of timing you're actually getting under load.

[nails79]

Thank you for the help Jeff