Since this came up in the general forum, I thought I had better post the chart over here.

Tune was by Cobb in Plano, on an AP V2. 2010 GSR.


Mods are pretty basic, and low cost...

• Cosworth drop-in
• AMS HFC
• HKS catback (65mm, not the usual 3", and bought used, and cheap!)
• Grimmspeed 3-port EBC
• Boost pill removed
• Cobb AP Protune

Results were impressive for such a small outlay.

319 AWHP / 357 Lb ft , on a Mustang dyno.

Looking at the chart, the torque peaks really high at around 3500 RPM, then drops smoothly to around 210 at 7400. It is, however, still around 280 at 6000 RPM.

Power seems to hit 240 around 3500, and maintains 300+ from around 4700 to redline.

Boost peaked at 25.99, tapering off from around 5400. I think target value at redline was 18.

Ambient temp was in the 60s.

This graph doesn't look like others I have seen on here. It hits higher torque, early on, than cars with similar mods, but it seems like a steep drop thereafter. Not that I am complaining. I love that torque hit low down, and the drop off is really only relative to a high peak.

What do you think? Does the curve look unusual?

 

if you're running the stock or unmodded WGA it may have issues holding boost, hence the big drop. If you tightened it or upgraded it, you'd probably smooth the curve out. A Cobb Protune from a Cobb shop is not likely to have a tune problem, so I'd be thinking mechanical causes.