Joe Z

iTrader: (10)

^^ Yeup.....

Should be close to Top Speed if I remember right... I got have the data pulled to double check the mph during our 6th gear pulls..

Jz

caymandive

iTrader: (2)

Indeed. Top of 6th is max speed of 170mph.
http://www.roadandtrack.com/assets/d...d/0108_ISF.pdf

houstonT

Yes, mine was SAE corrected, here it is by RPM:



Here it is by MPH (almost 170):

TherealFIG

While I would agree if I were in search of the peak number, I think I can take the same measurements (with this baseline held constant) and still weigh it on a percentage basis. Area of the curve and shape are what matters most to me and should to anyone looking at performance gains. Peak numbers will always vary IMO. I just wish I had done it while it was setup before for arguments sake.

Fig

Joe Z

iTrader: (10)

Hey Peter... anyway you can set these graphs with smoothing set to 5?? you will see a major difference....

Joe Z

houstonT

Actually, not a major difference, rather a very small difference. Peak dropped by 3 rwhp.

anajri

Caymendive

I think the torque curve and the HP curve do not cross @5250 is because the torque axis and the hp axis are on different settings or values.... if this is not the case then forget this post

by the way congrast on your 1/4 time !!!!!

Joe Z

iTrader: (10)

Interesting.. thanks for trying...

Our Dyno Jet runs in 6th gear repeated the same peak rwhp several times in the 333 rwhp range..
Which was basically an approx 20% loss in the drivetrain..

Jz

LexISguy

I just checked out the Hennessey website no longer mentions there ISF. Did they drop the project?

TherealFIG

here is my dynojet run from today.
6th netted slightly higher peak, but 5th felt safer on the dyno at 175.



I would call the difference negligible.