WhoDoYouThink

I am in the process of getting my car re-tuned. What would be the to use? A dynojet or Mustang dyno? I hear that mustang dyno's read lower whp than dynojet, why is this? Thanks alot.

_entropy

Don't even consider dynojet's for tuning. Mustang dynos can simulate any load you want, dynojets you're just spinning a drum that weighs what, 1500 pounds?

11SEC CIV

if your looking for max power #'s
dynojet will read more whp then mustang..not certain of % though
for tuning...either will do the job

Finland

It doesn't matter what dyno you use, as long as you keep using the same dyno after tuning changes.

From what I've read and heard, the MD dynos are conservative and tend to give you values that are 10 percent, or so lower than dynojets.

WhoDoYouThink

cool, anyone else?

HYREV2NR

[QUOTE=Boondock Saint]It doesn't matter what dyno you use, as long as you keep using the same dyno after tuning changes.
What he said!^^^^^^^^^^^^^^^^^^^^^

_entropy

Mustang dynos bring on boost realsticly, because they load the motor realisticly. Dynojets only use a 1500 pound drum, which is like putting the load of not even a 1500 pound car on the motor because your load increases as road speed and resistance increases. A mustang dyno is an infinitely better tool for dynoing, how many people on here do you know of that have trouble building or holding boost on a dynojet? lots.

f22b2tdave

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Napoleon Dynamite &raquo;</TD></TR><TR><TD CLASS="quote">Mustang dynos bring on boost realsticly, because they load the motor realisticly. Dynojets only use a 1500 pound drum, which is like putting the load of not even a 1500 pound car on the motor because your load increases as road speed and resistance increases. A mustang dyno is an infinitely better tool for dynoing, how many people on here do you know of that have trouble building or holding boost on a dynojet? lots.</TD></TR></TABLE>
couldn't have put it better, dynojets work fine for wot, but partial throttle tunes, nothign beats a mustang dyno. if you drive it anywhere other than down the 1/4 a mustang dyno is your best bet. or any load-bearing dyno for that matter, but i personally like the mustangs.

WhoDoYouThink

looks like mustang it is then! thanks for the info guys.

mrbsponge

i have only used a dynojet one time, for our supra and after tuning it on the dynojet it couldnt even make a full pass down the track.

sfter that

we switched over to an MD dyno, and the tunes have never been better, we actually load the cars a few hundred pounds more, like 2-300 more, so we can even see "worst case, real world scenarios"

and you can tune at each individual rpm quantity.

yeah dynojet is backed by nascar, soooooo what. all they are good for is measuring WOT. because not all cars, or cars gears are the same.


also you can do pretty nice 1/4 mile and top speed runs on an MD too

B18CXr

A mustang dyno is an infinitely better tool for dynoing

ditto

DRIVENRacing

voouch for mustang dynos...

RZFD

I started a thread on this a while ago.

https://honda-tech.com/zerothread?id=1220111

PeakBoost

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18CXr &raquo;</TD></TR><TR><TD CLASS="quote">A mustang dyno is an infinitely better tool for dynoing

ditto</TD></TR></TABLE>


ditto ditto

i have to admit though, it is very hard to get used to the marketing power #(dynojet) and the actual power#(mustang, superflow, dynapack).

we just tuned a car on our md-250 that was calibrated by the mustang dyno man Ron Phillips himself, to 226whp, took it to a dynojet 248x awd and it made 312whp on the same day within 1 hour, no changes made...
we will be comparing our md-250 with another md-250 this week, with another back to back comparison of the same vehicle, to see if the dynojets are really that far off....

the biggest thing most dont understand is that the mustang dynos use an actual load cell for direct tq measurement at the torque arm.

where the dynojets use a calculation of roll diameter, weight, and speed of the rolls, not a torque load cell....

dont even get me started on eddy current load control vs. water brake(dynojet)..

bump, this thread is good reading.

Peak

SOHC_MShue

More than likely your car will run leaner on the street than it will on a dynojet because its not actually putting the right amount of load on the engine. This could be very dangerous if you tune it to run a certain way on the dyno and then it runs leaner on the street.

Arturbo

Between the 2 dynos, mustang and dynojet, I'd pick a Mustang. But my 2 fav. are Dyno Dynamics or dynapak.

Me and Tony1 will be getting a dynodynamics once the shop is opend up here very soon.

tony1

Bottom line, you need to worry about who's tuning your car way before what type of dyno they are using. Yes, a mustang can do alot of stuff that the dynojet can't, but a good tuner can do alot more to keep your motor together than a bad tuner can! I've tuned ALOT of cars on dynojets and they all go down the track and drive just fine.

Arturbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Bottom line, you need to worry about who's tuning your car way before what type of dyno they are using. Yes, a mustang can do alot of stuff that the dynojet can't, but a good tuner can do alot more to keep your motor together than a bad tuner can! I've tuned ALOT of cars on dynojets and they all go down the track and drive just fine.</TD></TR></TABLE>
show off.

earl

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Bottom line, you need to worry about who's tuning your car way before what type of dyno they are using. Yes, a mustang can do alot of stuff that the dynojet can't, but a good tuner can do alot more to keep your motor together than a bad tuner can! I've tuned ALOT of cars on dynojets and they all go down the track and drive just fine.</TD></TR></TABLE>well said...

SpeedDreamz.com

dynojet 224xLC now has Eddy Current Load Absorption Unit, Torque Cell, and dynamic load control software. Perform loaded tests, including step, sweep, and wind drag simulation

WhoDoYouThink

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">More than likely your car will run leaner on the street than it will on a dynojet because its not actually putting the right amount of load on the engine. This could be very dangerous if you tune it to run a certain way on the dyno and then it runs leaner on the street. </TD></TR></TABLE>

Yup, that sounds exactly like what may be happening. It leans out up top even though the dyno showed it as running rich, it will detontate at 8k rpm but it was supposedly running super rich. and then partially it has to do with the tuner, who sucked ***!!! ( Turbo Technologies in Tacoma, WA )

Accel Junky

Its all relative. Just use the same one to detect changes.

Mustangs read lower, but they are more accurate.

DaZman69

if your using a dyno jet, its a good idea to polish it up with a street tune afterwards, so you can see how it performs under real load

Mase

A good tuner will make due with what he has to work with. ive used a handful and while i can say i like the features of dyno dynamics (and if i had to buy one, it would probably be one of them), however ive had less problems with dynojets.

while i still like to street tune vehicles before putting them on the dyno, ive done pretty well completely tuning on even a non-load bearing dyno (ie. dynojet). sometimes you dont have a choice if its a race car and u cant take it on the street.

i just got back from england and they had some dyno ive never even heard of. it seemed sorta accurate, but it wouldnt let the rollers go past 125 mph so i was screwed trying to dyno some of the cars in 4th gear.

but again, you have to make the best of what equipment you have to work with.