I doubt that was the case. This is actually a very typical chassis dyno graph. Dynojets are typically known for having more erratic looking graphs that some of the other load bearing dynos. There are also smoothing functions that average the readings to provide smother slopes and make the graphs a little easier to read. Most dyno graphs without correction look like this and there is nothing wrong with it that I can see. I'm curious as to the dip in the graph and would be interested in seeing exactly what the converter was doing as far as slip % and lock up go.My only guess (and I'm no dyno expert) is that the tires were slipping on the roller?
Do you have one with the AFR reflected on the graph?
If you're actually having belt slip, you've got a problem somewhere else. There's no reason you should have any trouble pushing 10 pounds of boost through stock heads and cams via a fairly efficient blower, especially not with an 8-rib setup. I'm running a 2.9" pulley pushing 13 pounds of boost on a 6-rib setup, with this much wrap:
And that's with an inefficient Eaton. 03/04 Cobra guys regularly push 16 pounds through 4-valve heads with the Eaton on an 8-rib setup. No reason an 8-rib Procharger only pushing 10 pounds of boost should have any issues with belt slip.
No 8-rib. Stock 6-rib w/ stock tensioner and a 3" pulley
3" pulley with a stock crank and stock-ish top end should see 16-17lbs.....we only saw 8.
Ive been through hell and back with my car. The build has officially taken a year and 4 months. There have been so many issues that I've had to overcome.
I tried to dyno a while back (I made a thread about it) but I was slipping like a mofo. So I carbinite coated my pulley and got 1+ lb. I then decided to convert to 8-rib. Im running an 8-rib with a HUGE pulley. I saw a max of 10lbs, but my peak numbers actually came on a run seeing only 8psi.
I had some idea about how important belt grip was, but not this bad. Im going to swap out my crank for an 18% overdrive with a carbinite-coated 3.2 pulley. I should see around 18lbs
Not to break your balls but I posted a dyno graph earlier that is power over MPH in the same configuration as yours. What he is telling you in that regard is total BS.
what belt are you running??
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