smooth01

is it common practice to increase ignition lead 1 or 2 degrees over the whole rpm range do to a lowering of the compresion ratio?
i am asking this, because i have a low compression forged motor now but still running off the factory 2001 timing table combined with a boost timing table.
i have already bumped the timing up 1 degree over the whole rpm range.
the car feels like it doesnt have the power it used too (under N/A conditions)
, but the car was off the road for month while having the motor built

forged low comp. 347, procomp heads, tsp 233/239 .598/.603 112lsa, 60mm turbo, 10psi, m6, efi live 2bar tune

NoGo

iTrader: (2)

I bumped my timing 3 to 4 deg over the range, then just watched for knock. Not an exact science....but I didn't have any issues.

I run 7.9:1

When you drop the compression your car is going to feel a little pudgy. It is the cross that all of us high HP pump gas folks must bare.

To deal with the pudginess, I increased the motor size to a 383.

smooth01

thanks for your input
I have some valve train noise do to the cam now, will that drive the knock sensors crazy?
Still running the factory rockers and lifters, with chromoly pushrods

NoGo

iTrader: (2)

You may get some false knock with a fully built motor. Cut your timing a bunch in that area (4-6 deg or so) and see if the knock goes away. If it doesn't, then it is probably false knock.

If it does, then you need to reduce your timing.