Every--EVERY motor will be different. 3* advance on intake a 1-1.5* retard on exhaust for the current motor.
unorthodox racing suggests 2-3 retard on exhaust and 1-2 degrees advance on the intake.
Main problem with the Apex ITC is that it is not boost/vacuum referenced. To my knowledge only the HKS EGC was boost referenced. You can set up the ideal ignition advance while under boost but then mileage and off boost performance will suffer. Vice versa--if you set the map for off boost mileage/performance then you will detonate or worse when in boost. The MSD Boost Timing Master retards ignition a set amount per pound of boost. In all honesty though I consider the MSD BTM a pile of crap and it would be somewhat difficult to make work on distributorless ignition. Jacobs BoostMaster had a completely seperate ignition curve when in boost. Worked pretty well but they are no longer made and rare. You would be better off getting a stand alone ignition computer instead of a piggyback.simann said:Messing with cam timing or "phasing" is something that the novice does not need to do without reading some good tech articles out of any hot rod magazine.
Just retarding the cam timing is not the only way, you must adjust the ignition timing as well!
Its like a husband-wife thing. You cant have the perfect baby without the two. LOL
All your doing is trying to squeeze a little more fuel/air into the combustion chamber all without pre-ignition ( detonation) or melting a piston from running to lean (advancing the timing on a turbo motor).
Or you can put some race fuel in the mix, and even run stock igntion/cam timing and put more boost in the chamber.
I would say get an Apexi ITC ( ignition timing controller ). its alot easier than fooling with the CPS and having only ONE set degree of ignition timing. That little device allows like 5 or 6 different rpm increment ignition timing maps! Much like an SAFC is to fuel.
Very cool. Advancing or retarding both intake/exhaust cam will move the power around a bit but becuase the stock 7M cams are incredibly mild with little to no overlap (depending on cam timing) you can really increase the power band by changing the timing individually. Good luck and please report back how you do!turbodhbar said:Thanks Dean,I am not into the bling thing. I asked this question because most of my engine building has been domestic cam in block V8's.I say most because the only non V8 has been my 7MGTE.
I use to racing 1/ 2 mile dirt track and you could change how the motor responded out off the corners and down the straight with cam timing. advance more bottom end , retard more top end.I rebuilt my 7m two years ago.and put 6k on it that summer as my daily drive.
Didn't have any reliablity issues only a couple small problems . Last year a change of job kept me from driving it at all, 0 miles . now that the motors is well broke in I want to start some upgrades. Hoping to take it to Watkins Glen and possibly Pocono and run the road coures So I am looking for info to find out if the 7M would respond the same.