I know the whp is probably not close to any particular dynos, but is it accurate enough to judge performance increases by? Reason I ask is today I tried out some high boost expirements with the car. Same road, same conditions, same car.

31psi yielded:

2byte load max of 338 @ 6300rpm (31psi)
2byte Airflow max of 2917 @ 7800rpm(29psi)
lb/min max of 58.4 @ 7800rpm(29psi)
WHP max of 534 @ 7800rpm (29psi)
TQ max of 376 @ 5400rpm (31psi)

29psi yielded:

2byte load max of 312 @ 5400rpm (29psi)
2byte Airflow max of 2698 @ 7700rpm(29psi)
lb/min max of 54.4 @ 7700rpm(29psi)
WHP max of 490 @ 7700rpm (29psi)
TQ max of 348 @ 6100rpm (29psi)

All tests done with pump 93, stock engine and cams.

Any thoughts or ideas?

SQ

 

I'm assuming you're talking about the loggable data items, and not the power estimate in the "view log file in graph" mode?

I ran an evoscan log while doing a dyno run on a mustang and the peak numbers were pretty much spot on (within 2hp/tq). You can't just look at the highest WHP number on the log though, you have to kind of already know around what rpm you make peak power at and look at the WHP number at that rpm. For example my logs say I make like 390whp at 7500rpm, but I know I peak around 6200rpm. Looking at the whp at 6200rpm was 371whp in evoscan and the dyno said 370 peak power.

 

yeah I was reffering to the loggable data. I have no idea what rpm I make peak power at, but I would assume it is pretty high up there with the bigger turbo?

I need to go to the dyno before I install cams for comparison, but I think it would do around 440-450 on a dynojet as is based on my trap speed from the other night. If it actually hit close to the numbers evoscan reports, that would be beyond any of my expectations! haha

SQ

 

JohnBradley came up with those estimates originally and said something about being able to look at the 2-byte airflow, and looking for it to drop a little or plateau and then begin to rise again, and that was supposed to be where your peak power was. Might try looking for that.

 

I looked over my logs and the airflow never drops or plateaus. Always rising from WOT to letoff. Maybe that is just the nature of the bigger turbo? Hopefully JohnBradley will chime in here.

SQ

 

2 byte airflow will jump in fairly large increments all at once...like 15-20hz segments. It will then slow down to 5-6 and then revert right around when peak power is produced in my experience. A large turbo still wont help small cams as far as peak hp at peak rpm.

The numbers are only constant with an air filter that doesnt screw with the MAF and a stock MAF (things like MAFT or MAFT Pro invalidate). It is also based off airflow so changes like higher compression pistons, electric water pumps, taking belts loose, etc. will not register in its ability to estimate hp. Remember its an estimate and really only truly valuable as a before and after. I tried getting it as close as possible but is not infallible.

Torque should be pretty much spot on since its boost relative and the turbo hasnt reached peak airflow yet.

 

Ok thanks JB. So it would be safe to tune according to the estimated hp as long as no other variables are changed?

Here is the logged airflow data, where do you think it is peaking at in your opinion?

477.8434375
506.6398438
521.0871875
545.8540625
577.9920313
600.8915625
606.6901563
662.0225
698.4848438
789.5915625
844.7273438
889.0521875
955.686875
1026.940781
1101.143125
1281.5875
1416.625938
1565.42375
1741.54375
1881.791094
1981.841406
2074.422344
2122.187031
2178.502188
2215.849063
2309.314531
2362.976094
2379.585625
2458.407188
2495.459219
2532.118125
2592.364531
2658.016406
2677.9675
2734.5775
2755.707969
2789.713281
2813.98875
2854.578906
2882.195938
2914.432188
2917.282344

Thanks guys,

SQ