shanec

I've been comparing that chart above with this one, which is MudFlap's non-intercooled vortech car:



Granted, the peaks are different because they are different cars setup differently (besides the superchargers). The saleen peak hp is about 25 hp above the vortech peak hp. But on the low end, the saleen is also 25hp higher. If the vortech were slow to kick in hp, I'd expect to see more of a difference on the low end.

Similar thing applies to the torque curves. I see the saleen's peak torque being about 30 lb-ft higher. And on the low end, the saleen is about 40 lb-ft higher. So the Saleen did improve its margin over the vortech on the low end, but not by much.

I was really expecting the saleen dyno plot to look heads and shoulders better than a vortech plot on the low end of the rpm bad.

shanec

Update from my PM with Mudflap - they dyno guy stopped the car at 5800 rpm instead of running it through 6500 rpm. So there's a huge reason for the difference in peak power.

OK so to better compare apples-to-apples. If you line these charts up at the 5500 rpm point, they hp numbers are about equal. And then as you go do lower rpm, the Saleen has 25-30 hp advantage. So there's a difference that would feel noticeable. Not a huge difference, but maybe noticeable.

Mudflap

Yeah I wish they would have run the car to 6500, but oh well. I was not present and when I picked up the car 5 minutes before they closed that night, I just saw the #s on the dyno sheet being right at my desired target and went on my way. It wasn't until I emailed a copy to Seth at Brenspeed, and he replied that it was a 5800 RPM pull that I even knew about it. He said it was good power for the pull, and it probably would have peaked around 415 at 6500. This was on a 91 octane tune FWIW. Thanks for the comparo Shane, interesting.

shanec

I found another Saleen chart here - http://www.dragtimes.com/Ford-Mustan...lip-10364.html

As far as the relative shape of the hp and torque curves goes, it looks pretty much like the other saleen chart already posted here.

PolkThug

I've driven both styles and the twin screw feels more 'intant-on' to me, while the centri has more of a 'build up' feeling. (both fun either way)

My 1.5 cents...
You can use the dyno sheets to make generalizations, but as I've stated many times in the past, don't get too caught up in the specific dyno numbers. My sheet was SAE corrected to .98, meaning %2 was subtracted to get the numbers you see on the chart. We don't know how the other chart was handled. I've seen dyno operators abuse the correction factor before to try to impress people. There are all sorts of variables. I've even seen a dyno brake dragging slightly causing numbers to be lower. Its been a little while since a 'I'm bummed out because my numbers are low' thread, but I'm sure we're due.

Dyno sheets are great for comparing your car against itself for before/after mod/tune or cold engine vs hot engine, etc.

AKRA

I have a copy of the dyno from before I upgrading my Supercharger from the 475hp kit to the 3.4 pulley, Saleen extreme intake and JDM tune.

Before those above additions with the Saleen 475hp kit my car dynoed 397.34 rw/hp and 374.68 ft/lbs torque. It was dynoed at Saleen in Troy MI. I would post it but because I am a newbie the message board won't let me. Send me a private message with your e-mail address and I will e-mail you a copy.

Note: There was a drastic SOP differance when I added the 3.4 pulley and the Saleen Extreme Intake. It was nice before with the 475hp kit but it is exremely fast now.

Good luck,

Al