I pretty much have an idea as to whats going on.

With my old tune (21 psi) with higher timing values I was getting strong launches off the 2 step set at just 5906 RPM. Now with my new tune (25psi) with much lower timing values I just bog horribly off the 2 step set even as high as 6100 RPM. What can I do to remedy the new tune to launch? Increase the timing at the 2 step load values? Any help is appreciated.

 

anyone?

 

Log the car and see what is happening. I have seen knock go through the roof doing 2-step, and then the car is stuck in the low-octane maps until it can recover.

 

boost would build more if the ignition was retarding and adding fuel from the ecu interpolating between the high & low octane map

 

I think that was the problem. I actually went down to 5800 and it fixed the problem. It kinda seems backwards but it worked.

 

It helps to slowly ramp to the 2 step, don't just mash the pedal. That usually prevents knock

 

Good advice...thanks.

 

This is what I do. Mine is set at 5300 rpm and I don't bog and pull 1.7 consistantly.

 

My logs confirm the above.

 

What boost levels and loads are you seeing during the "stationary rev limit"? I don't see why any peak boost changes would ever effect this area of the tune? Especially in the higher rev ranges. I could see if you were in the "ramp-up" areas but thats wayyyy lower in RPM.

 

probably there is less timing and more fuel were it engages now. usually the 2step load is between 120-160.

 

Well, I certainly never alter my 5500-6500 rpm/120-160 load areas when tuning for different boost levels.

 

You never know what the tuner did