I need some help on my torque curve and horsepower curve. This is my first turbo combo and I just got it together, been beating on it all summer and just trying to make sense of the data for changes over the winter. The question I have is the horsepower and torque curve do not cross at 5200 it is way higher in the rpm band. From what I have read and seen they should always cross at 5200. Does any one have any insight on this. Here is the combo stock 6.0 with 317 had ported by me just speed bumps removed. S475 T6 cam is 231/239 @.050 .617/.623 valve lift on a 114+4. Best time was 10.5 at 127 on 10 lbs car weight is 4100

Any help would be greatly appreciated.

 

I forgot to post the math channels

 

Your pic is in mph not rpm, but it's just a datalog that is the ECU's guess, it's not the same as a dyno graph. You need to get it on a dyno to see the graph and crossover at 5252.

 

Sorry I didnt catch that. Would it make a difference being at the track versus data logging it on a dyno. Here is the data log with rpm.

 

To even have a chance you would need to be in your 1:1 gear at a low enough RPM when you go WOT. Even then, I wouldn't guarantee that it shows the right numbers or RPM crossover. You really need to have it on a dyno using the dyno printout to accurate see the graphs with RPM crossover.

 

Thanks for the reply. I guess then I can only use it for reference only for peak torque numbers on not dropping below that. Does the math on the math channel look correct for torque.

 

I would look it is as a baseline for changes to see the impact.

 

Sort of related, but how accurate are the crank power estimates from fuel flow?

 

Those are actually decent, at least when I've compared them to logs and looked at airflow consumed.

 

Ideally you'd want to be recording and making changes at the track and not the dyno anyways right, especially if you've already tuned the car on the dyno?
I've heard so many people say that what works on the dyno may not be what works on the track is why I say that.

 

I got the impression that the OP hasn't had the car on the dyno. I was simply saying that a dyno is really the only time i've seen the 5252 cross. All these math calculations are either horribly inaccurate or shifted. I do agree though that track vs. dyno.......track all day.

 

 

That is a correct statement from ddnspider, I have not had it on the dyno. This has been street/Track tuned. First time on tuning a boosted application and according to the wallace calculator the fuel flow/ hp/ weight/ injector duty cycle/ trap speed of the vehicle are pretty close. Thanks everyone for there input on this.