efrommel

Last night I was on the dyno and the car mods are in my sig.
the pulls was on third gear.
The car dynoed 277hp 230tq the graph looks kinda of weird, other thing the car the day before was running 10.8-11.0 afr and at dyno was on 10.3 afr. The guy from the dyno says that maybe is the belt slipping because how the boost goes along the rpms. here are the graphs
Temp 78.09F Humidity 79%

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let me know what you think
thanks

JapEatr

iTrader: (9)

belt slip possibly,

efrommel

I am thinking that but want other opinions just to make sure

thanks

ralliartist

you used a dynojet, it doesn't put load on the car. On the street you have load. On a dynojet, the car will run richer due to not being under load. You can try to adjust your tune just for the dyno but I don't think it's worth it.

good numbers though for being so rich.

efrommel

But if I tune it and lean it a little there going to be dangerous to the street right?

but Thanks man that relieve me a little, but what you think about the graph. And the boost?

ohh other thing the humidity was very high. 79% and the temp was 78.09F

ralliartist

yea, you'd have to richen it back up for the street.

everything else looks fine to me. If you had belt slip, I'd think you would see a drop in boost somewhere or a drop in power, but it climbs at a pretty normal rate.

efrommel

well then its better to go a mustang dyno right?

ralliartist

mustang dyno's put down slightly lower numbers. but they are said to be more realistic. It all depends on you. Every dyno is different.

Dennisscars

Can't speak to the numbers but there is something to these new belts. Here's something I posted earlier about my experience with belt slip.

Heads up to those who do more than street boosting. I came across this belt gauge from Gates and since it was the magic "FREE" I ordered one. Gates link here The Two Guys Garage video in the link explains all.

It took what seemed like a good amount time to receive. To my surprise at 20k supercharged Z06 LS6 miles and almost 50 track days my belt on ole fatty indicated a good bit worn. All of my visual pretrack inspections belt looked like new and since this one has never thrown I was reluctant to change. Traditional thinking predicated that 20k miles is well under what is expected for "normal" usage for this type of belt.

My guess is that with the extra load of the larger supercharger, particularly at track boost/throttle frequency, causes an accelerated wear rate. My LSJ Atom with twenty some odd track days in one year of dedicated track use showed signs of wear as well. Looks like I'll be changing more regularly.

For the occasional street romp I'd suspect that it would last much longer. I tried to take a picture but it really doesn't do it justice.

So blaa blaa blaa folks check your belt, no reason to let slippage leave boost on the table.

BLAZIN07SS

iTrader: (7)

even 11.0 is too rich for an LSJ. lean it out to around ~11.8AFR