So at 4k revs my power and torque seems to hit a brick wall, any thoughts on why this would be?



I have some DV's which I need to install.

Car has a Tubi and a tune.

Should I get another tune from a trusted tuner?

Thanks

Lee

 

That is a bizarre looking graph. Could you provide us with a few more details as to what tune you're using , etc.?

 

Sorry dude, I bought the car and it was already tuned.

I went with another GT2 and we both got identical looking graphs.... but he got a little less BHP. possibly the same tune?

He does not know the history of his cars tune also.

 

Though i do not have an answer for you, it looks like it could either be the actual dyno or if you look at the post below, it looks similar:


https://www.6speedonline.com/forums/...ant-996tt.html

How the heck does the graph go BACKWARD toward the end?

 

It's plotted over RPM, not time, so it tracks as the dyno opertor let off the gas aroun 6900RPMs and power dropped as RPM's receeded.

 

That may well be wastegate springs. You may have an issue with the wastegates not holding pressure at WOT above 4K...

Mike

 

Thanks, I will change DV's as I have them already.

How do I fix the wastegate spring issue? Sorry for newbie question!

 

It looks reasonable to me until 6500 rpm then the curves look screwy. I suspect operator error.
BTW, how did they figure how the get back to FWHP from WHP?

 

whp divide by .80 (generally agreed awd drive train loss)= crank hp

 

Here is the RWHP

 

This is not a good tune by just looking at it. Too many dips=loss of power. Software not reading hardware? I had a very similar issue and fixed it now. What is your AFR? What gear was this achieved in?