Wtf?
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
14.7 during acceleration is too high. You should be down around 13 to keep the combustion temperature low so you won't detonate.
Safety Car
Joined: Sep 2001
Posts: 4,134
Likes: 531
From: Glenbeulah Wi
With the ZZ409 cam and mini ram you need to shift around 5500/6000 RPM to take advantage of the cam and RPM potential of the combination. You should also be targeting around 12.7:1 AFR at WOT. I would not set the base timing at 12 degrees, since that will push total timing too high at WOT and create knock retard, which will kill power.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
With the ZZ409 cam and mini ram you need to shift around 5500/6000 RPM to take advantage of the cam and RPM potential of the combination. You should also be targeting around 12.7:1 AFR at WOT. I would not set the base timing at 12 degrees, since that will push total timing too high at WOT and create knock retard, which will kill power.
Hopefully something will work.
Melting Slicks
Joined: Apr 2001
Posts: 2,089
Likes: 214
From: Ca.
I shift pretty high, when I get the MSD6AL2 ignition box I will set the rev limiter to 5800 RPMs. Tomorrow I am going to run the stock tune and see what my tuner thinks with that tune on there. I am also going to drop the timing to 10 degrees and see how that works out and I also requested that my tuner sends me a tune with 12:1 AFR at WOT, just to see how it works out. I readjusted my valves today In case they were a little to tight, and I did find a small vacuum leak at the MAT sensor between the MAF sensor and the throttle body. Hopefully that'll take care of my idle surging. Maybe the new valve adjustment will have an affect on performance.
Hopefully something will work.
Hopefully something will work.
Thread Starter
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
As you changed injectors the injector voltage offset table also needs to be adjusted for those injectors-without that it's gonna surge. Don't know who's tuning, but if you mention adjusting the injector offsets and they say "huh?" then it's time for a new tuner-or learn how to diy.
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
As you changed injectors the injector voltage offset table also needs to be adjusted for those injectors-without that it's gonna surge. Don't know who's tuning, but if you mention adjusting the injector offsets and they say "huh?" then it's time for a new tuner-or learn how to diy.
Melting Slicks
Joined: Apr 2001
Posts: 2,089
Likes: 214
From: Ca.
If it's the same size injector and it's latency is close enough to the original you can get away with no changes to those. Otherwise it can be a PIA.......
