[Z06] Dyno done, but there is a problem...
Thread Starter
Heel & Toe
Joined: Dec 2006
Posts: 21
Likes: 0
Dyno done, but there is a problem...
I just got back from doing my dyno, had 4 pulls and this is the best one, however they all had a problem around 5300-5400 rpms, if you look at the sheet you can see, what could be causing this?
I'm completely stock except for WO tires all around.
I'm completely stock except for WO tires all around.
Burning Brakes
Joined: Nov 2004
Posts: 988
Likes: 4
From: Livermore CA
If you look close, torque and HP do cross at 5250, Most tunes have a maximum commanded power enrichment for about 100 to 200 rpm on either side of the torque peak for engine protection. This looks like it is being commanded too rich at that RPM. I wouldn't make any changes until, as others have suggested, you see what the A/F ratio was during a pull. That's too low of an RPM for valve train harmonics to be entering in. The other cause would be knock at your torque peak causing your computer to pull timing. Knock retard can be monitored during a run also.
