Really low correction numbers?!!?

[dub2gsx]

I have 680cc injectors on my set up and my correction numbers are really low. They are set for -38% high and -37% low across the board! I don't know why they are so low, just hoping to see if any of you all have low numbers too. The thing is I did a pretty good run at the track even though my tuning was set just on base line numbers, not fine tuned at all. I had a 13.2 at 101mph on 91 octane, with boost set at 17 psi (plus on the stock clutch that slipped pretty bad in second gear). I didn't have my logger with me that night because the battery was dead right before my friends and I were going to the track ! That night was hot too so my timing was getting pulled a bit. It was my first time at the track ever, and I only was able to go on four runs.

If anyone has a simular situation or knows why they are so low please help me!

Brian

 

[spyderturbo007]

That sounds about right. Baseline correction should be about -34% on the SAFC. Combine that with compensation for the pig rich factory maps and you should be a little more negative. If I remember correctly, the factory map is for 9.5:1, whereas most guys / gals run in the neighborhood of 11:1. So you will need to go more negative than the baseline correction numbers to lean out the AFR.

I would say if your timing curve looks good and your FT's are close to 0 at idle / cruise to "drive on".

 

[dub2gsx]

That good, I thought my car was just nuts

All of the other dsm guys around here were confussed on why they were so low but I always just told them hey my car runs great like this I don't see how it's so bad. I was just scared to turn up the boost past 17 psi untill I found out that my numbers were close to being right. I turned up the boost 2 psi and I can feel a nice difference. Can't wait to hit the sweet spot on this turbo. Thanks for your input!

Brian

 

[spyderturbo007]

I turned up the boost 2 psi and I can feel a nice difference. Can't wait to hit the sweet spot on this turbo. Thanks for your input!

Brian

Ahhhhh......The "butt dyno" hard at work.

Whenever turning up the boost, I like to take a look at airflow numbers. It is possible that you are turning up the boost and not getting a proportional increase in flow. Back to the old rule of boost = heat and airflow = power, you can see where I'm going with this.

Also, there is no reason to run more boost than you need, as it just puts more stress on the motor. I would take a look at your airflow at 17psi and compare that to your airflow at 20psi (or whatever you turned it up to).

I'm too lazy to go back and check your profile, so I can't even comment how high you should be able to run the boost. I need to stop being so lazy at work........