All old school MD dyno's I've personally been on read right at 13% lower. This argument has been beat like a dead horse.

Point is... your clutch's hub drive can't take it. Either keep replacing it... or move to a clutch that has a better designed hub... or contact Evan @ Exedy USA and see if he can help you out.

 

I agree with you on the clutch hub, completely.

Regarding the horsepower #s on the Mustang vs. dynojet matter, I'm really not sure why you are trying to convince me that you are right. Honestly, I really don't care what the percentage difference is between the two dynos. Remember, I DIDN'T say it. tcompusa is the one who made that comment. Go convince him because I could care less one way or the other.

 

Well I couldn't care less. So why don't you talk to him

 

Don't suppose you have a dyno graph with a boost plot you'd post up ^_^

 

+2 on this^^^^

 

Thankful to have good men like you on the job!

 

Not here. I have a print out of it somewhere at my shop.

 

Im curious, does the clutch slip on launches? 660wtq on a MD is a poop ton! Definitely puts it near its limit.

Also, is this an SR or HR?

 

The clutch had not been slipping. But, I never launched the car on a good, sticky tire. Just street tires. Most of the abuse occurred by simply rolling into the throttle on the street. That's why I'm surprised this happened.

I'm not sure what you mean by SR or HR?

 

Very strange. The clutch comes in with two pressure plate versions, SR being standard and HR being heavy duty. I was just curious if it was the standard or heavy pressure plate.

The HR is rated to 880ft-lbs at the crank and the SR is rated to 660 or 670 ft-lbs at the crank.

 

Well, I think mine is just the standard version. But here's the thing, the clutch never slipped. In fact, I wouldn't have known anything was wrong with it if I hadn't taken it out for transmission upgrades. It was then that it was inspected and we discovered what we did.

So, I'm thinking that the basic design is going to be the same even on the HR version with the same basic hub - which is the flaw in the design. The HR probably provides more clamping force for a higher torque rating, but that doesn't fix the fact that the parts are poorly designed for this type of power, IMO.

 

We havent seen that issue. When I get to the shop monday I will pull my CH16 out and show you what it looks like with 15k and 630 ft lbs. If the Mustang really does read 13% less than a DJ and you were making 800 ft lbs, you are

#1 one of a few to get that close.
#2 at the edge of the clutches design limit

Aaron

 

Oh yea no doubt the designs are the same at the hub, I was just curious which version you were making 660wtq on

 

speed industries dyno is 20% lower then a dynojet.. we tested this on scotts evo.

he only made 514/416 on their dyno and his car will go 140mph+ (the dyno room doesnt help at that place though - it gets hot)

i think way2qik's car almost goes 160. if you didnt want this mentioned ill edit it man.. sorry.

 

Tom, I don't care that you've put it here in the thread. I just want him to argue with you and not me about it