We tested out the numbers on our dyno (Mustang) against Dynojet and the dynojets always read higher.. We have 3 dynojets in our area and they are are pretty consistantly about 12% higher. The tunes come out way better on the mustang due to the superior load control. Never tried a Dyno Dynamics, but honeslty the mustang dyno translates to real world so well I have no desire to use any other dyno except for comparison purposes.. A buddy works as a mustang shop and hes gotta little turbo CRX, it put down 296HP on their dynojet, he brought it over for me to retune on a different system, we did a baseline pull just to compare before and after and on our dyno it read like 265HP or somthing like that. Car ended making 312HP on eCtune over crome on the same boost, was a stock LS with 16G .. I wonder how much that is on his dynojet lol..

 

only one way to find out... put it on the dynojet or get weight and e.t.

 

Problem is variables and the user being able to change settings. This is why I will not tune when travel tuning on a Mustang Dyno / Dyno Dynamics or similar unless I personally know the operator (Thanks Mrbsponge ). I tuned a car a while back. It made around 450whp. I can't remember exactly. I argued to the end the car was making more. Owner was upset. Right after the dyno we took it to the track. Car went around 145mph. Again I can't remember exactly as it was a long time ago. Then on the flipside. I used Mrbsponge's Mustang Dyno. Car made 790whp. Car went 150mph with a 2.2 60ft. This is the only issue I have with these dyno's. Though it was great when Dyno Dynamics came out with their ShootOut mode

 

I know of a 2 friends somewhat like that too, the car made something like 480~ on a Gt40@25psi couldn't figure it out for all hell, the car ran fine though brought it to the track ran a 10,1@148? I could care less about the numbers if the car runs right but i've heard a couple stories that the dyno shoots out random numbers time to time. I remember a K crx putting down like 232 on a fully built motor that was suppose to put out 280-290. Just curious if anyone has had it happen that owns a DD. On dyno my n/a K car made 211/154 on dynojet, then 225/167 on a dynapack 2 days apart same weather/humidity conditions.

I guess as ppl said it's the dyno operator putting in the wrong values for temp, etc It makes sense as both shops we're new and dyno had just been installed maybe 1 1/2 - 2 months before.

 

I think the descrepencies are in the operators.. If they arn't set up properly, or are messed with then its very easy to have random results. That CRX after I retuned it went 11.6@116 (full interior - hood) at the track like only a few hours after I tuned it.. The last pass it woulda gone faster, the short track was like almost .5 faster all the way to the 1000FT but I couldn't get it in 5th (B16 tranny with 4:9 final) and coasted to a 11.7@106..

 

we have used a DD before & was not really impressed with it. thier is a controller that u can spin & it will affect the brake so u get a higher # very easy. its normally used for when a car is spinning really bad.

but we always use our MD cant go wrong with it. exp the sport compact version.
the BIG *** brake is what gives it its advantage over the other dynos. but nothing is really as solid as actually driving down the track. Data doesn't get any better than that.

 

ive had 2 cars run on a dyno dynamics. the one i was on sure as hell didnt read lower. one was a civic with a 7.5:1 comp d series and a dsm 13g that made 282whp and the other is a mustang that made 588, which i then redynoed on a dynojet and it made 494.

however, the dyno was literally brand new (a day or so old) so the operator might not have had it calirated correctly yet.

 

I have had more problems with FWD on mustang dynos then DD. IF you do not know how to run a DD, you will ALWAYS have problems.

 

what kind of problems?
traction?

 

Always. Japtrixs dyno and HP logics dyno. It is a mustang dyno problem. I think different strap locations would help, but it is deeper then that.

 

Mustang Dyno (and others) hold the car in place from the front and back (with straps) while a Dyno Dynamics dyno pulls the car DOWN into the rollers which allows you to get better traction and more consistent results each pull. DD also cuts their rollers differently than anyone else and I KNOW this helps a ton and also why slicks NEVER work well on a DD unit.

The other difference between a DD and a Mustang is the roller mass...you will always be able to notice minute changes in power output with less mass on the roller (when using steady state or during a pull) which is a nicer feature of the DD unit as well.

I looked at a lot of dyno units before I purchased mine, and used a few as well. It came down to the DD and the Mustang and after using both, I went with the DD unit...and for the MOST part, I am glad I did. There are still some things (software related) that havent been addressed properly since the new digital units came out.

 

We have the same axle tie downs that pull the car directly downwards as well as front and rear ties.. I would have to say one weak point of the Mustang dyno is the intuitiveness of the software. It lacks alot of simple usuable features, but it does have some very nice graphing ability if you dig deep into the software.. You are right about the rollers being lighter, but it has yet to be an issue..

 

I may be wrong but doesn't Dynajet have new load bearing dynos where you can adjust the amount of brake?

 

[QUOTE=ALL IMPORT;41106920]we have used a DD before & was not really impressed with it. thier is a controller that u can spin & it will affect the brake so u get a higher # very easy. its normally used for when a car is spinning really bad.

Your refering to the **** that adjusts the ramp rate, if the dyno is used in shootout mode the ramp rate is set the same every time.

 

[QUOTE=cpl racing;41119877]As long as you know what ramp rate to set on a given application, NA, FI and NOS then its all gravy with the DD. One thing to note is that you should know a ball park figure of what power the car is going to make and u adjust the ramp rate accordingly.

Ramp rate is the rate of acceleration on a given run in KM/hr.

Lastly, any tool in the hands of a person that has ill intentions (wanting to show more power) or inexperience will most likely yield skewed data. I have set my own DD as it was instructed to me by the tech at DD and in my case I dont really care if it reads lower than the local DJs. Why ppl always say these DD read lower and not why do the DJs read so high?

 

For what its worth:
The KING dynojet reads 9-10% higher than Suja1s DD.
We saw this with 3 completely different setups.

More and more DDs popping up. I know 3 shops in Chicagoland have purchased one in the last couple years.
Tuners love em', Dyno# braggers hate them...
In the end its all about the final tune.

 

People always complain how our dyno reads low.... I still love it lol.. Its the closest you'll get to real world loading period. Funny cause we had a twin turbo viper on it a couple weeks ago. made like 937HP/1000.4TQ doing 4th gear pulls. The owner had it over at a dynojet to get some comparision numbers and he had to do 5th gear pulls to get it to fully spool. made 1055HP on the DJ.. Proper loading makes such a huge difference when dealing with really high boost/power..

 

Tuned on a MD for the first time ever and its so much nicer than a DJ. Only issue was having to explain to the customer why he didn't make as much as he thought he would. Oh well, I don't think I'm going to be tuning much on dj's anymore. Not after yesterday.

 

We did a couple decent comparison pulls to show some differences.....
I had previously made 204whp on a DJ(lowest reading in Chicago at that) and after a larger intake and more tuning, only made 198whp on a DD. After I saw a near stock H22 make 151whp and i/h/e H22s making 160-170whp on the same day/dyno I was at ease with my 198whp. AFRs were a lot nicer, powerband went a little longer and sure as hell felt smoother.(My initial concern of course was, is something wrong with my motor after all this abuse???)
I have no problem admitting I used to get hung up on numbers, I have since learned.
Dynos are for tuning, not bragging. Well, unless of course you're doing the bragging b/c you just proved someone Dead Wrong after they had their heart-broken by The Heart Breaker-DD!