Boosted Tuning

iTrader: (12)

18% difference?

My math says its a 14% difference...

Corrected DJ # = 578

UNcorrected DJ = 572

MD number = 493

493/572= .8618

So a MD is 14% less then a DJ.

David Buschur

iTrader: (53)

Great information and thanks for posting it up. That is a big spread in power. Switzer performance is right down the street from here, he has/had an AWD Dynojet. His dyno to mine and Mike at AWD's dyno to mine is about 13% difference, mine being lower. BTW, Switzer only uses our dyno now, his is taken apart and under a cover, I guess that says what he prefers He did some datalogging on his dyno, then the road on the way here and then on our dyno, he saw what the facts were. Road compared to our dyno were spot on the money, boost, spool up, AFR's etc. Anyone want to buy an AWD Dynojet? Contact him.

JohnBradley

iTrader: (30)

I'll find some dyno plots where we shifted on the dyno. I am not sure why it does but right at throttle chop it will almost always spike when vs MPH or a really violent chop. The fact that I saw power nose over prior to that and know what the gearing should be versus rpm in that pull helps too

aaron

jasnm21

iTrader: (3)

I do believe that math is wrong because if you do 493*1.14 you get 562... However if you do 493*1.16(572/493) you get 572. I am just saying and I may be looking at it backwards.

AndersEvoIII

This is one of those 5th grade math problems:

The Mustang reads 13.8% lower than the DynoJet numbers.
The DynoJet reads 16.0% higher than the Mustang numbers.

They're both correct and correspond to the same numbers...

EVO IXMR

iTrader: (6)

Listen the fact of the matter is k.h.c has a low reading dyno and the tuner doesn't due tune his maps..Now your put in the system as a low reading mustang . We now you have 3 that are real deal low reading mustang dyno's in the evo world..Great job petey for what the car is it's a beast..

1.buschur
2.stm
3.k.h.c.

compscibOi

iTrader: (19)

Haha! The master has spoken, and I agree 100%.

Dyno's should only be used as a tool to tune and diagnose engine performance. To truly simulate what the car does on the road an AWD Mustang Dyno with Eddy load simulation is preferred and what I only use for my Evo.

Dyno's differ. Only track times and good driving can be compared, when weight is disclosed on how a car performs differently than another.

E-Spec@Tach Motor Works

iTrader: (11)

Great info Petey!!

Please fill us in on why there's 85hp difference in hp but only 40hp difference in tq? Why doesn't the difference carry over to the peak tq output?

Also the tq curves were different from one dyno to the other? Were these both 3rd gear pulls??

Thanks for sharing your findings with the community!

jasnm21

iTrader: (3)

Add Doug's Dyno, GST and CBRD in there to make that statement correct.

JohnBradley

iTrader: (30)

RPM synch can do that if its off a little. Obviously it wouldnt be off too much but 100 rpm can make a difference.

t-revzr

iTrader: (7)

Is it safe to say a mustang dyno and dyno dynamics are really close then as well too?

Boosted Tuning

iTrader: (12)

If the dyno dynamics is ran on 1.0 CF.

The problem is most shops with DDs change the CF to 1.15-.20 to try and represent dynojet numbers.

VETDRMS

iTrader: (3)

Wow, that's a pretty big difference. But unless you are e-pening for numbers the real focus should be on using dynos to measure incremental improvements.

AWD Motorsports

iTrader: (211)

Thats what i noticed right away as well.. both the curves are not the same so you need to view the chart before that high spike to get a better idea of the difference.. that spike for 25rpm on top is meaningless in the peak #..

usually MD dynos read about 13% less than ours..

Mike

Boosted Tuning

iTrader: (12)

^^ Im not wrong.

But your not either