Mustang Dyno's are designed to accept drag racing passes full on with load bearing rollers, have the quarter mile software and unlike a Dynojet 424x with eddy current brakes (a $15000 option), the mustang dyno can display HP and TQ figures while IN load mode, whereas Dynojet cannot.

Furthermore Dynojet cannot safely accept highline biased AWD vehicles as the rollers are not linked together. The front and rear spin at independant speeds which can damage expensive drivelines in Skyline, Porsche, VW and Lamborghini.

 

Drag racing is done at the drag strip not on a dyno. Nobody cares if you can run an 11.5 on a dyno.

Our DynoJet has eddy current PAUs on both rollers. Although we can not do 1/4 mile passes, we have 3 tracks within an hour of us and another two within 2 hours.

Who cares if you can get HP and TQ readings IN load? What benefit does that have to a tuner?

Would the cars you mention be damaged if tires were spinning different speeds on the street? What is there to prevent that from happening?

 

You can use the simulation part of the software to change the grade to simulate going up or down hills, you can change the grade percentage on the fly as you are driving if you wish. The ramp up rate can also be changed to somewhat simulate wind resistance with higher speeds.

Indeed, and the dyno does the same if you sync it for whatever gear you are doing a pull / driving / tuning in.

For ecu-controlled boost, having it hit load as close as possible to the street is pretty important. We do alot of ecu-controlled boost tuning so this was imperative for me, which is the main reason I did this test

Indeed, I check most cars on the street as well. The track cars I test in most gears on the dyno and street, and if possible, the track too.

I really didn't start this thread to start a dyno vs dyno war. In fact, my only experience is on a Mustang dyno so I really have no standing even bringing something like that up, so I didn't/don't.

I started it to share some data that I thought was interesting.

I agree with this. I have yet to use this feature and probably never will. The straps are strong but I don't have that much faith in them.

This is actually a pretty damn cool feature, more so with standalones with real-time tuning and not the stock ECU (unless you are using COBB RT maps). You can have the dyno hold a certain MPH or RPM. Seeing real-time TQ numbers allows you to see if you are hitting over or under MBT for each load cell. It also makes tuning cruise and partial boost AFR much easier as you can hold each throttle position at each load cell easier.

 

Tuning 1-4th on a dyno with the proper load, will reap the results at the track.

Tuning a 3rd gear pull or a 4th gear pull does NOT mean the car is tuned for a quarter mile run. Period.

Who cares if you can get HP and TQ in load? I do. Knowing the changes you make are reaping benefits while the proper load is applied as it would be on the street should be important to any competant tuner.

 

Do you use these features? How much do you charge for a tune for uphill driving? Say the wind is blowing hard from the north at about 20 mph, do I need a retune? You know I am kidding. Basically these are features that will never be used.



Which basically compensates for you being on a flat road and no wind. Do you weigh each car before you dyno it so you input the proper weight? How do you adjust for different aero on the car? What cd value do you use for a wingless evo versus an evo with a wing and a vortex generator?



ECU or speed based boost? Weather has a huge effect on spool. Even if you completely dialed in your speed based boost on the dyno, weather changes will mess it all up. Then there is the uphill downhill wind thing too................



That is good for your customers. All good tuners should.



I used a Mustang Dyno practically every day for 6 years at my last shop. I hated that dyno. It was difficult to operate, the ign pickups sucked, sweeps through MPHs sucked. Give me an ON OFF button like a DynoJet and I am set.

I found it interesting also. I wonder how much different the boost curve would be on a DynoJet. My guess is not much.



On the MD we had at the last shop I worked for, we had a couple cars launch off the dyno. Not a good thing but it was in ground so no major damage.

Its cool and fun to rip through the gears but its not like being at the drag strip. The car is not loaded the same and beyond about the mid 12s, its not very accurate.



Spending the time to get each cell to "mean best torque" must be extremely time consuming. How much do you charge for a tune? (kidding again) How many different combos of timing and AF can be used in each cell to reach the MBT? I am sure you can see where I am going with this.

Light throttle driving is a constantly changing environment. A dyno that "holds" rpm or load is basically useless. Light acceleration on ANY dyno does just as good a job simulating light throttle operation. Holding a car at a certain RPM or MPH is outside of normal operating for a car. I can see no use in this for tuning a turbo car.

I am not trying to start anything. I just dont want people to believe that a tune on a certain dyno is any better than another dyno. All dynos provide enough load to tune cars fairly accurately.... What is most important is who is behind the keyboard.

 

You tune a car in 1st gear? Is your tune different in 1st gear than it is in 5th gear?

Are you saying that my car that has never been tuned in any gear but 3rd is not tuned for the drag strip?

Are you saying that you tune part throttle for HP / TQ ?

 

Actually yes I do. For every tune? Nope. Will I be using it more often now that I know for a fact our dyno matches street load? Most likely.

No I don't. Do you? I said "simulates" so yes there is no right answer to this. Can we set the weight for each car based on their weight changes? Yes we can. Do we? For cars that are obviously changed weight from stock, we try to, to the best of our knowledge.

Ecu load-target and also Ecu Psi-target boost. Again, that was the main reason for me starting this thread, to see how close our dyno matched street load so I would know how much time was needed, off the dyno to set all the boost tables correctly to match where the customer actually drives. With ecu-boost, dialing in the WGDC, Load-target and error correction tables correctly are imperative to how the boost control system can correct itself to changing conditions.

RPM is used for ON/OFF on the mustang dyno. We synch RPM to roller speed.

I would be interested in this as well. Like I said previous, all my experience has been on a Mustang. I used a dynojet about 10 years ago for about 30mins so my experience with them is lacking. I will not pretend I know everything or even 10% about them. It would however, be interesting to see the same kind of "test" done.

To be honest I do not use this feature since I do mainly stock ECU tuning. Mike, however does a lot of AEM EMS / Hydra / Etc stand-alone tuning and does use this feature to build maps from scratch on cars that he does not have base maps built for already. So yes this feature is used on our dyno, just not by myself yet. So again I would not be the authority on this, I only know it is a feature.

I agree with this 100%. Again, a dyno is a tool and not a e-***** device. I believe in this wholeheartedly.

 

[QUOTE]1st-4th, yes. The AFR's and accel enrichment is different than in a one gear sweep.

I do not know the details of your car. This is an Evo forum.


We tune under load for WOT and a multitude of conditions.

 

yeah,

the mustang dyno rocks.

period.

i love boost on the dyno matching boost on the street. and not having to turn it up or down, like i have tuning on other dynos then going to the street.

cb

 

Tis why we just changed our order at the last minute from the 424x to the AWD500SE.

We saw too many limiting factors for a long term relationship with an inferior Dynojet model.

 

yeah, i have nothing but good things to say about our dyno....

cheers

cb

 

Mitch - You are correct, I did sell you your dyno as well as a few other shops on EvoM (CBRD in particular since he's in this thread)

 

dildojet

 

Tim Gentil?

 

yeah,

tim is a cool cat.

cb