Yeah the sim is sohc. You have to change all the cam profiles. overlap, duration when all events open and close. Its more difficult to do for dohc.
Heres some info i discovered for all the 4g15 guys
One cam tooth equals 9* on the 4g15
Advancing one tooth boosts bottom end by a few horse but topend goes to crap big time. You lose over ten horse from about 3k on up.
Retarding one tooth (turning cam counter clockwise) yielded the best results. You sacrifice about three horse between 2k and 3k but then the hp and torque rise an additional 10 hp! the torque curve also shifts up the rpm range about 500rpm.
Ive only tested the results driving a few times so far. I'll have to do more driving but i noticed no more flat spot at 3k. Pulls harder at high rpm too.
This engine was a dog at low and high rpm, all the power in the mid range. Now there is more power all the way to redline.
I believe this mod is worth the effort so far. One more note: I had to carve out the adjustment slots on the distributor to achieve the proper ignition timing. Other wise with the dist. cranked all the way, you'll get about 3* BTDC base timing.
Runs crappy that way. I'm sitting at 8* BTDC now. After modifying the dist. i can get up to 12*.
I'll see if i can save the pics from the dyno sim so everyone can see the differences. Sorry so long
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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t