I'm not sure if I'm in the right place but here's my question. I heard that the mustang dyno readings are under rated by 15%, is this true????

 

depends how the dyno is calibrated.....

 

Its only underrated if you're using it to bench race. If you're using it properly as a development tool it doesn't matter as long as your runs are performed under consistant conditions while testing incremental changes on the same engine. You can't compare the output of one dyno against the output of another, especially if it is of a different type such as a dynojet 248c.

 

All i know is when i put my GSR on a dynojet i put down 144WHP. When i put it on a Mustang dyno i put down 125WHP. Now the owner of the mustang dyno said that the mustang dyno was under rated by 15%. Thanks for all your input.

 

whoa! i can tell you first hand what the differrence is.

almost all mustang dynos have a load cell and the operator is required to enter vehicle specific information (vehicle weight, power required at 50mph, etc) so the dyno can apply specific force, hence "actual" #'s. also a dynojet is an "inertia" dyno and can only be used for w.o.t. tuning. where a mustang can apply a specific force, and a car can be tuned at any given rpm, therefore giving an actual tune. how can a dynojet properly tune a car? it can't really. its basicly a toy for wot use. a dynojet also cannot let a tuner or car owner know about an overtaxed/inadaquate fuel system, ignition system, clutch etc.

i researched dynos for many years before purchasing a mustang md1100se. also to note every dynojet owner i asked told me the only reason they owned one was because of the name... ha! i have seen first hand cars tuned on dynojets and the customer taking the car home to blow up solely because it is tuned at w.o.t. and no load/or improper load is applied.

 

Wow, thanks for that info snoochie. Now I want to get my car tuned on a mustang dyno =/ But I don't want to pay another $350

 

Damn!!! for $350.00 you can drive here and back (mad,wi) for less than that including food and gas. what they charge at your local mustang facility anyway? what model and options do they have? what do you have for ecu?

 

The mustang dyno is at Central Florda Turbo. You can check their site http://tunedbycft.com/cms/.

I got tuned at a local shop on a dyno jet. The dyno jet didn't have the big magnet to put load on the car. =/ I was kinda pissed.

Oh and I'm running Chrome

 

well a chrome tune shouldn't cost that much unless your'e on the dyno all day long, damn!!! you should check on which model mustang dyno they have, although 95+% of mustang dynos have a load cell, they are available w./alot of diff. options, and capabilities... if they don't have at least a md500se then they don't have much...

 

How much would you expect a chrome tune to cost and how much for a hondata s200/s300 tune

 

depends on your setup, n/a or forced. and how much tuning you want done, it takes more time to do forced induction cars. an n/a car on chrome shouldn't take more than an hour tho.

 

good info snoochie boochies!


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSR in Progress &raquo;</TD></TR><TR><TD CLASS="quote">All i know is when i put my GSR on a dynojet i put down 144WHP. When i put it on a Mustang dyno i put down 125WHP. Now the owner of the mustang dyno said that the mustang dyno was under rated by 15%. Thanks for all your input.</TD></TR></TABLE>

man, that seems kinda low. is your gsr stock? mine got 164whp on a mustang dyno.

 

No Mustang dyno's do not read low.

DYNOJET is the only company in the industry who fudges there number. They have a fudge factor which increases the correct inertial Hp higher. This fudge factor is very indepth and is not a set value.

So this 15% you hear of is dynojet fudging there numbers not Mustang reading low.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Snoochie Boochies &raquo;</TD></TR><TR><TD CLASS="quote">depends on your setup, n/a or forced. and how much tuning you want done, it takes more time to do forced induction cars. an n/a car on chrome shouldn't take more than an hour tho.</TD></TR></TABLE>

Boosted, and he didn't tune for more than an hour. I'm gonna go back and ask for a dyno sheet and post it up here

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by trickeng &raquo;</TD></TR><TR><TD CLASS="quote">No Mustang dyno's do not read low.

DYNOJET is the only company in the industry who fudges there number. They have a fudge factor which increases the correct inertial Hp higher. This fudge factor is very indepth and is not a set value.

So this 15% you hear of is dynojet fudging there numbers not Mustang reading low. </TD></TR></TABLE>

never heard of anything like this... hmmmm...

 

+1, i've only heard what you previously posted and that was from the person who dynod my car and has both dynos

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Snoochie Boochies &raquo;</TD></TR><TR><TD CLASS="quote">

never heard of anything like this... hmmmm...</TD></TR></TABLE>

???? its a fact! not debateable! Marc Dobeck wrote it in i hot rod magazine. he is the creator of dynojet.

 

i'm gonna have to disagree here. your previous post would need alot more info as to why it is true for me to even consider it...

 

you can disagree with what ever you want.

here is the exact wording from hotrod mag:

The DYNOJET fudge factor straight from the horses mouth!!!

While many think that the industry standard for chassis dynamometer HP is DYNOJET, there may be something you don’t know or have a hard time believing. That the numbers reported on a DYNOJET are fudged higher simply to make them more acceptable.

In a recent article printed in HOTROD Magezine, Mark Dobeck the creator of DYNOJET spilled the beans on the “fudge-factor”.

Here is a quote from that article:

“One of the biggest headaches of DYNOJET’s go-it-alone chassis-dyno project was figuring out how to assign meaningful power numbers in the face of unknown inertia from the moving parts of the hundreds or thousands of engine, driveline and tire combinations. Wrestling to fully understand inertia and powertrain losses, Dobeckand his team quickly realized that the standard physics formula of weight, time, and distance for converting acceleration into horsepower simply didn’t work----the derived number was always lower than accepted numbers. They poured on resourses and burned up time and money investigating it, but no matter what they did, the math never added up.
DYNOJET’s final number-fudge was arbitrarily based on a number from the most powerful raod-going motorcycle of the time, the ’85 1,200cc Yamaha Vmax. The Vmax had 145 advertised factory horsepower, which was far above the raw 90HP number spit out by the formula. Meanwhile, existing aftermarket torque-cell engine dynamometers delivered number that clustered around 120. Always a pragmatist Dobeck finally ordered his chief Engineer to doctor the math so that the DYNOJET 100 measured 120HP for a stock Vmax. And that was that: For once and forever, the power of everything else in the world be relative to the ’85 Yamaha Vmax and a fudged imaginary number. Dobeck’s engineering staff was dismayed by the decision, but the DYNOJET 100 exclusively measured surplus power available to accelerate the vehicle’s mass – no more , no less – and that was true even if the modification was a low inertia flywheel or lightweight wheels.”

So the next time you want to compare your DYNOJET HP numbers to other chassis dyno’s, you must consider that your DYNOJET numbers are at an unfair “fudged” advantage.

 

that may be true that a head dynojet guy made that decision/and those machines are "fudge machines" my knowledge of chassis dynos is based on all that i have learned from mustang over the past 5 years and that's why i went with them.... not to mention, all i have learned from dynojet owners.