Dynos.. Mustang, DynoJet and Dynapack

[Element Tuning]

The Dynajets I've been tuning on read pretty low. My FRS baselined at 150 whp (6 speed). Another I tested the owner's car baselined 159 whp. For NASA testing I use these because they don't read far off a Mustang I also use so if I use the Mustang and have to add +10% it's a big penalty.

It's really just about the delta so as long as you have a good baseline any dyno will do the trick really. Customers don't always see it that way as it's more glamorous to use a dyno that gives you an extra 30 hp even though the delta from stock is the same.

Thanks,
Phil Grabow

[mid_life_crisis]

Originally Posted by Toma

Definately not a myth. But some caution is in order. All dyno numbers can be fudged.

Definitely need to be careful. There is a part I didn't include that states that the results need to be "repeatable". I read that as you better come up damn close to your declared numbers if we call you for verification tests.

[Toma]

Originally Posted by SubieNate

I think it depends on what they're calibrated to. Since they're not super well known or "industry standard" the one my brother's car was tuned on was calibrated to approximate at Mustang Dyno's numbers. His stage 2 setup with a protune put out 230whp on it. Stock STi's run 205hp/220tq, stock 2.5L WRX 185hp.

Cheers
Nathan

A dyno shouldn't be calibrated to anything except the exact mass placed at an exact length on the load cell. Thats how load dynos are calibrated. They arent supposed to be fudged and manipulated to approximate something else.

[SubieNate]

Originally Posted by Toma

A dyno shouldn't be calibrated to anything except the exact mass placed at an exact length on the load cell. Thats how load dynos are calibrated. They arent supposed to be fudged and manipulated to approximate something else.

As an engineer I would agree, and I don't know the tuner/shop my brother had the work done at personally, but from a business standpoint I can see the logic in wanting your setup to read closer to something people recognize as a standard. It may be that the owner has just from experience found that cars read about the same on his dyno as a Mustang Dyno so that's what he tells his customers it's comparable to reading wise since it's not one of the big 3 brands.

Cheers
Nathan

[Toma]

Originally Posted by SubieNate

As an engineer I would agree, and I don't know the tuner/shop my brother had the work done at personally, but from a business standpoint I can see the logic in wanting your setup to read closer to something people recognize as a standard. It may be that the owner has just from experience found that cars read about the same on his dyno as a Mustang Dyno so that's what he tells his customers it's comparable to reading wise since it's not one of the big 3 brands.

Cheers
Nathan

But any load dyno should read about the same....and they do. Ive owned a mustang and a dynodynamics and worked quite a bit on super flow. Unmolested, they are all very close. We know dynojet was a deliberated fudge but also an inertia dyno first and foremost.

Locally here, a gt500 just dynod 720 on a dynocom and 590 on mustang. I would put it at 650 dynojet based on experience.

[Element Tuning]

I am also noticing a trend on this forum for using "standard" correction instead of SAE because it will result in a higher number. I also notice the trend of not including a stock baseline pull or even noting what the power is.

It's all fine as long as know the delta and the reader can see that 190 hp on one dyno is really the same gain as 170 hp on another.

[Toma]

Originally Posted by Element Tuning

I am also noticing a trend on this forum for using "standard" correction instead of SAE because it will result in a higher number. I also notice the trend of not including a stock baseline pull or even noting what the power is.

It's all fine as long as know the delta and the reader can see that 190 hp on one dyno is really the same gain as 170 hp on another.

Yeah, STD is a nice couple percent bump lol.

The FRS is a weird car. My Dynodynamics USUALLY reads lower than a Dynojet, but I pull the FRS in fifth (1:1), and getting 159 to 168 for STOCK ones. Which seems very similar to Dynojets, but noticing a lot of Dynojet guys pull them in third???

[86pro]

Ive known that dynopacks read lower than others. the OP says the average is higher but doesnt clarify. it all depends. For instance a high horsepower car on a dynoject with no weight on tires read lower than dynopack. the slipping and stuff makes it low. cant get it to roller. therefore dynopack is more accurate for that. A lower horsepower car on a dynojet is fine. as for saying ALL cars avg higer on dynopack, there are so many factors to consider. It just isnt that simple.

[Element Tuning]

Originally Posted by 86pro

Ive known that dynopacks read lower than others. the OP says the average is higher but doesnt clarify. it all depends. For instance a high horsepower car on a dynoject with no weight on tires read lower than dynopack. the slipping and stuff makes it low. cant get it to roller. therefore dynopack is more accurate for that. A lower horsepower car on a dynojet is fine. as for saying ALL cars avg higer on dynopack, there are so many factors to consider. It just isnt that simple.

Every Dynopack I've ever used reads higher than most dynos and it should, no wheels and tires.

[Element Tuning]

Originally Posted by Toma

Yeah, STD is a nice couple percent bump lol.

The FRS is a weird car. My Dynodynamics USUALLY reads lower than a Dynojet, but I pull the FRS in fifth (1:1), and getting 159 to 168 for STOCK ones. Which seems very similar to Dynojets, but noticing a lot of Dynojet guys pull them in third???

Yeah in NA I will pull 3rd for power pulls or 4th (If I want to load it more for tuning) to cut the length of the pull time down. I don't get much of a difference in the peak power with the two different gears (NA) but it can change the shape a little.

For boosted application 3rd gear is too short.

I've tuned all over the country and even the same dynos will read different from location to location. The AWD Dyno Dynamics I use in Seattle reads the same as the local AWD Dynojet.

I remember tuning on a dyno and getting really high numbers. I even told the customer it seemed too high. Later I found out it was in STD correction vs. SAE and the difference was +5% which is huge on a 650 whp car. I think the temperature can make a huge difference in the SAE vs. STD correction.

[kombatlion]

Good Morning guys I need help I have a question... in the mustang dyno there is a input called power@50 I have seen diferent tuners change this numbers for example importuner frs shootout show that they used 12.2 my tuner used 14.5 and my frien tuner used 13.7

what aro those numbers for and what does it change the ones that tunes with the 13.7 had 178whp and 192 corrected whp

http://www.importtuner.com/events/13.../photo_01.html#

[fooyc]

So far I have try both the dynojet & Dynapack on my stock car. both show about 160whp (on pump gas).

Dynapack is good for places where we cannot dig a hole on the ground.

[RacelineUSA]

Who says you have to dig a hole for all other dynos.

[NYCsubaruBRZ]

so if i made 184.7 on the mustang dyno at prime motoring then it would be ~210 on a dynojet?