445hp on a mustang dyno is close to 500awhp on a dyonjet

 

Not always. Your trap speed is the true indicator of power. You can make a Mustang Dyno say anything. I trap 113 with about 330whp on a Dynojet, and you trapped 121. That's an 8mph difference, which is about an 80-90whp difference on a Dynojet generally speaking.

 

121 mph on a trap I would say is more then ~ 415 whp on a dynojet...

simply comparing to your numbers maybe so but on average it would be more in the 450 whp range

 

What makes you think that? I wasn't just using my numbers, but those of many others. Mine is just the most direct example. Here are a few others that I know of firsthand:

03 w/alky dyno'd 350/350, then trapped 114.8mph
03 w/alky, cams, and AEM EMS dyno'd 400 and trapped 119.5mph
Jose Rivera (down your way) dyno'd 373 and trapped 116.7mph

Here are my combinations:
248whp = 104mph
282whp = 107.5mph
294whp = 108.5mph

All figures are on Dynojets.

 

ok well Scott from TTP-Engineering trapped I believe 115.5 or so and he dyno'd at ~ 410whp..

also ct9a gsr who dynod at 390 whp trapped 118 and I believe this was a mustang dyno.

so if this guy is trapping 121 id imagine he is 450 whp+ on a dynojet.

I mean we can argue forever on guesstimting what he could make using several different examples, but in the end lets just agree that 121 is a nice trap lol

 

sounds like this turbo is pretty comparable to a gt35r?
121 is a pretty sick trap. congrats!

 

He has the stock clutch also which makes him take it easy out of the hole. This makes for less "useable" power when you cant go WOT until after the clutch is engaged. The average HP on the run is lower because the RPM's are lower when you baby the launch.

Also Wartalon, you are comparing a 5 speed car with different gearing to your 6 speed car. That adds a little bit to the equation as well. Shifing speed also plays a part in the trap speed as well. I know his car is not shifting very well right now either.

One other thing, he is running out of gear in 4th gear at his 7850 redline, because he is using 225/45/17 tires. They are slightly smalled diameter than the stock size.

I am 90% sure that this dyno is roughly 9 to 10% lower than the dynojet at Topspeed. Reason being there was a car tuned at topspeed that made 42x whp there. It only made 381 whp on this Mustang dyno. Same exact tune, same boost, etc. etc. There is also another car that dynoed at both and it showed similiarly as well.

This mustang definitely doesnt read like Buschurs however.

I am fairly certain his car would be in the 480 to 490 whp range on a dynojet.

My $.02.

Brian

 

Where did you get this kit?

 

This was the Dynojet at Topseed like me : ), not a mustang

 

so you got the Greddy kit less the Emanage? that sounds great!! if so, how much money did you save?

 

I sold it to him

 

and where did you get it.? I'm looking for specs and info.

 

Yes, that is why I have never believed Scott's claims. He may make 400whp, but people trap 115-116 all the time with ~360whp, so if he really has 400+, then it's the 6spd gearing that is holding him...4th gear hits 111mph at 7600, and he's having to rev it to 8200 just to get his 115, so that may be what's holding back his mph. I'm not so sure, though, because his 1/8th-mile mph is only 1-2 higher than mine, and I'm not even at 350whp. You used Charles as an example when it supports my argument. He did 390whp on the TopSpeed Dynojet and trapped 118, which is exactly in line with what I'm saying. From what you were saying, he'd have to add 60whp to gain 3 more mph, but he would only need 30whp more, which would be 420 as I surmised earlier.

Anyway, as Brian said, there are previously unknown limitations here that are affecting the trap speed by 7-8mph: improper clutch and improper rev limit for such a huge setup. When he gets a proper clutch and raises the rev limit to 8200, then we'll see even more MPH probably...

 

The 390hp was on our 424x Dynojet here at the shop which nets cars that trap around 118mph. 330hp nets about 114mph and to run 121mph you would have to dyno around 450hp on our dyno.

Mustang dyno's are great tuning tools but are pretty useless when trying to compare hp number to track times as they never are correct, as the dyno shop can manipulate the numbers to read really high or low.


Edit: don't forget that we aren't just talking about peak hp numbers... anytime you install a larger turbo the peak numbers may remain the same but the hp curves don't drop down as far.. leaving more power in the upper rpms which helps run faster times.

 

im around 430whp on a Dyno Jet and i my traps speeds are around 120+mph