Hey all,

I've been tuning my wastegate maps lately moving from an erratic ~22psi curve to try and hold a smooth 27psi out the top. I believe I have done a pretty decent job up to this point. I have been starting in 3rd gear at around 2500rpm for each run up to 6000rpm to start out with no corrections.

The way my wgdc maps are set up there is a significant spool increase by having a high duty cycle at low rpms. However this only applies to my 3rd gear pulls. If I start in 4th gear at 2500rpm spool is very slow and boost is actually lower by about 5psi all the way to redline.

My high and low gear maps are all set the same. I don't know if I'm running into surge and if that's the cause. If it is surge I don't hear that sound that's normally associated with it and my MAF voltages did not seem erratic. Should I utilize different high and low gear maps to correct it?

I will post my current map for critique and suggestions.

 

Got it figured out!

Logged it and found wgdc was only 48.5% under those conditions. I had left the target boost error table completely zero'd out except for the row which was -10% just in case things got out of hand.

Well I should have anticipated the higher gear with more load building boost faster and moved my target tables upward in the lower rpm to compensate. Feel like an idiot but I'm learning everyday!

 

Good catch, happens to the best, glad you figured it out though.