Dyno variances
 

What do you guys think:

Vette doctors performance built my 416 and tuned it to 530 rwhp. The car runs great. I thought it would have run a little faster than the 122-125 trap speed that it ran at AAA.

I installed a FAST 103 and 102MM TB. We are almost done with the tuning and are around the 450 rwhp range.

The VD dyno was a land and sea dyno. The JBA dyno is a load bearing dyno. Do you guys think that there is enough difference in dynos for the huge difference in power.

If its a loaded dyno then very much so. One is probably a mustang dyno and the other is a dynojet.

That seems like too much to me. In my case I ran 380 and 391 on a mustang and dynojet respectively. The car was setup almost identically AIR.

Weren't you at 465 with your previous setup and running 122 traps? If so, that's a fair indicator this engine may simply not be making anywhere near 530 RWHP, which I would think in a Vette would put you closer to 130.

The first H/C/I ls2 made 490 and would run 118-120. The ls3 stroker made 530 and would trap 120-123, almost 124. I thought it had more in it because it didn't feel like it pulled up top like the ls2. That's why I got the FAST and the TB. The only way to find out is to take it to the track.

The first H/C/I ls2 made 490 and would run 118-120. The ls3 stroker made 530 and would trap 120-123, almost 124. I thought it had more in it because it didn't feel like it pulled up top like the ls2. That's why I got the FAST and the TB. The only way to find out is to take it to the track. I made more power after they were done then when I drove it in. I will go drag racing soon and see what she traps.

Regardless, I will have to put the car on a dynojet dyno for NASA.

When's that gonna be? The 14th.

Hot Rod mag did a dyno compare a few years ago. Same car taken to 4 shops without changes to the set up


And the whole article....

http://www.hotrod.com/techfaq/hrdp_0...e/viewall.html

Not the 14th. Speedventures has a points systems that determines the class. I have enough point to force me into the unlimited class.

NASA is strictly a pounds per horsepower system (when you have a major engine mod). It will be in Jan or Feb.

That's what I thought. The spread is not *that* big. 530 vs. 450 is pretty major. Maybe a combo of difference between Mustand and Dynojet and shit hot day vs. a nice cool day? Even that seems a little much.

How did they determine RWHP with just the motor?
Is that called a scientific guestimation, like global warming?

There are a myriad of variables between the flywheel and the where the rubber meets the road and every car is different.