These are just some results from 2 of the local dynos, here in Twin Cities, MN.

Nothing was changed between dynos, not even the oil.

Mods:
111K miles Stock block VIII
IX turbo
AEM Intake
Kelford 272's
EPM 02 dump
Ebay FMIC
Ebay TBE
Forge BOV
1200cc Inj.
Walbro 255
E85

 

all I know that the mustang read 40whp lower than a dyno jet.

 

That is not always true. It varies from dyno to dyno and climate conditions, etc. It is better to have a dyno that cannot have their correction factors changed. This leads to straight numbers from the car, and no human can inflate correction factors to beef up the numbers.

 

yeah theres always a big difference with MUSTANG dynos, take for example a

TTP's MUSTANG DYNO
&
BUSCHUR's MUSTANG DYNO

both read differently, it all depends on what the shop has the settings set @

 

I made 465hp 410 TQ @ RS Motors so I should be over 500 at Maps..

 

That car needs to get back on the dyno. The other 6262 I had did 486/434 @ 27 psi. Time for bigger injectors.

I think my dyno reads pretty close to gst. Everytime I max out a set up on some kind of injectors and pump, it's similar to GST's numbers. It's just numbers. Let it rip at the track. Right Kevin!

 

Nice!

And ya you cant say 40whp less from a Mustang vs a Dynojet is true, you have to go by percentages.

In this instance, the Mustang reads 6% less. But on another comparison sheet I saw from an LS1 Trans Am on a Mustang compared to a Dynojet, the difference was 12%

Youd read just under 500 since his differences were 6%, youd make 492whp. (465 x 1.06 = 492)

 

I did the Dynojet pulls for fun & the money went to a good cause, breast cancer.

Next goal is to go back to the Mustang and crack 400. And yes, at the end of the day this car rips looking at EITHER #

 

I heard TTP just had a Mustang technician come down and calibrate it to the correct standards.

Even then, the reason TTP's was different was because they used correction. When you're living in a state that's 80-90 degrees compared to a state that's in the 50s, some correction should be made.

Whatever...a dyno should be used as a before/after and not to compare between different dynos.

 

TTPs dyno seems to read quite a bit lower than it use to. Should be on par with others.

 

Fyi to get the true numbers from a d.j.dyno is to put it on non corrected and that's it cause it can throw the dyno reading off a bit if its on sae and the sea level is not exact .Also when a dj reads it should say on the bottom of the page of the sheet 1.0 correction not 1.02.

 

I always heard the mustang dynos read low, but accurately.

 

I find it interesting that the torque is so much higher than the hp on the Dynojet reading which is not the case on the Mustang.

 

Since the pictures hurt my eyes I'm stealing the numbers from the OP's sig:

386/381 Mustang Dyno
410/427 Dynojet

 

The tq. reads higher b/c of how the dyno loads the car. Less load from the dynojet resulted in the higher tq. figure than hp.