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Old 01-08-2008, 04:25 PM   #1
team trucha racing
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Default mustang dyno #'s to dynojet #'s

i have an 04 sti stage 2. mod's are ti-tek catless d/p, blitz nur spec catback, hks u/p,perrin equal lengthe header, aem cai,re-circulated greddy type-s bov,perrin stock inlet, acessport v2, was tuned a while back @ harman motive on they're new mustang dyno and the car made 273whp and 293wtq on 91 oct. and 291whp and 309wtq on 95 oct. i want to know what kind of power i would have made on a dynojet with those number's.if there is a formula for that. just curious so if someone can help i would appreciate it. thanks.....



-Rob
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Old 01-08-2008, 04:28 PM   #2
PowerTrip
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I think Harman's Mustang reads about 12% lower than their old Dynojet. For reference my old '06 STI with just a Cobb TBE dynoed around 262/284 on Harman's Mustang.
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Old 01-08-2008, 05:06 PM   #3
Farnk
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I've wanted a formula for that for months. Best I could come up with was that its about 12-15% lower than a dynojet which is still just a guess. And imo seems to be too much.
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Old 01-08-2008, 05:26 PM   #4
team trucha racing
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thats what i fugured about 15% so im probably making around 312whp and 336wtq dynojet power.
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Old 01-08-2008, 06:29 PM   #5
PowerTrip
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Quote:
Originally Posted by team trucha racing View Post
thats what i fugured about 15% so im probably making around 312whp and 336wtq dynojet power.
It's closer to 12%...
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Old 01-08-2008, 07:34 PM   #6
cpturbo
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When are you people going to realize that a dyno is a TOOL not a gonadal measuring stick? Area under the curve from one tune to the next is all that matters as well as safety within that tune. If you want to compare your car to other cars, then take it to a track and settle it there. Many with less hp power on dyno A have whipped the fan boy on dyno B.
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Old 01-08-2008, 07:44 PM   #7
Dave D.
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Quote:
Originally Posted by cpturbo View Post
When are you people going to realize that a dyno is a TOOL not a gonadal measuring stick? Area under the curve from one tune to the next is all that matters as well as safety within that tune. If you want to compare your car to other cars, then take it to a track and settle it there. Many with less hp power on dyno A have whipped the fan boy on dyno B.
You're no fun anymore.
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Old 01-08-2008, 09:32 PM   #8
AZScoobie
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There is no formula. Each dyno reads different and has different weight rollers. You can make any dyno read what you want it to read by altering it.

Clark
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Old 01-08-2008, 09:36 PM   #9
Paintballguy
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Quote:
Originally Posted by AZScoobie View Post
There is no formula. Each dyno reads different and has different weight rollers. You can make any dyno read what you want it to read by altering it.

Clark
Which is why people shouldn't be all upset about dyno numbers.

Run it at the track to get some real numbers that mean something.
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Old 01-08-2008, 11:19 PM   #10
downsti
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Quote:
Originally Posted by AZScoobie View Post
There is no formula. Each dyno reads different and has different weight rollers. You can make any dyno read what you want it to read by altering it.

Clark
Quote:
Originally Posted by Paintballguy View Post
Which is why people shouldn't be all upset about dyno numbers.

Run it at the track to get some real numbers that mean something.
very important stuff
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Old 01-09-2008, 06:32 AM   #11
sjl1614
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I had my car on a Superflow dyno. On SAE numbers, it made 326 awhp & 342 tq. The software on the dyno can convert to dynojet #'s, they are 358 awhp & 376 tq. Dyno jet are known to read about 10-13% higher than the actual power, we can thank Harley for that. I also had the car on a dyno dynamics dyno, there it was 271awhp, didn't get tq #'s since it was a dyno day.
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Old 01-09-2008, 08:37 AM   #12
speed industry
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I have a Mustang AWD dyno, and know that it will spit out lower numbers than any other dynos around. I also know that it pushes back harder than any other dyno around..that's why there's no street tuning needed after getting tuned on my dyno. I also know that low 300's on my dyno equals a high 11 second Subie, which has been proven...so the numbers are secondary to the robustness of the tune you get.

I'd be happy with those numbers on a Mustang dyno. How does the car drive? Are you happy with the performance?
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Old 01-09-2008, 08:45 AM   #13
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Quote:
Originally Posted by speed industry View Post
How does the car drive? Are you happy with the performance?
Exactly, because ultimately, that is ALL that matters.
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Old 01-09-2008, 10:15 AM   #14
tux121
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I would just stick with the Mustang Dyno #'s. Makes it more challenging.
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Old 01-09-2008, 12:51 PM   #15
sponaugle
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Quote:
Originally Posted by sjl1614 View Post
I had my car on a Superflow dyno. On SAE numbers, it made 326 awhp & 342 tq. The software on the dyno can convert to dynojet #'s, they are 358 awhp & 376 tq. Dyno jet are known to read about 10-13% higher than the actual power, we can thank Harley for that. I also had the car on a dyno dynamics dyno, there it was 271awhp, didn't get tq #'s since it was a dyno day.
Quote:
Originally Posted by speed industry View Post
I have a Mustang AWD dyno, and know that it will spit out lower numbers than any other dynos around. I also know that it pushes back harder than any other dyno around..that's why there's no street tuning needed after getting tuned on my dyno. I also know that low 300's on my dyno equals a high 11 second Subie, which has been proven...so the numbers are secondary to the robustness of the tune you get.

I'd be happy with those numbers on a Mustang dyno. How does the car drive? Are you happy with the performance?
First, you should not be using SAE corrections. See http://forums.nasioc.com/forums/showthread.php?t=873912 for a detailed explanation why.

Second, the Mustang as well as many other loading dynos can adjust the length of the pull to suit the tuner. You can make the Mustang run faster by reducing the load, and effectivly get close to the ramp time of the dynojet ( the closeness depends on which rollers you have). You can also make the pull take 15 seconds, or 200 seconds. As well, you can also use the simulation mode to add more drag at higher RPMS but less drag at lower RPMs in an attempt to simulate real road drag.

The most important thing is to pick one ramp time/rate for all tuning of the same car, so you can get an accurate reading of what changed. I personally prefer the target run time config, as it makes reading very consistant pull to pull. If your dyno operator doesn't understand what the "Vehicle Simulation" selection on the Mustang dyno does, you should be concerned. A professional should know his tools, and know them well.

Cheers,

Jeff Sponaugle
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Old 01-09-2008, 02:11 PM   #16
4SFED4
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Quote:
Originally Posted by cpturbo View Post
When are you people going to realize that a dyno is a TOOL not a gonadal measuring stick? Area under the curve from one tune to the next is all that matters as well as safety within that tune. If you want to compare your car to other cars, then take it to a track and settle it there. Many with less hp power on dyno A have whipped the fan boy on dyno B.
+ whatever it takes.

A chassis dynomometer is a comparitive tool, not an absolute one. Even dyno results for the same car performed on different days cannot be empiracally compared as fluctuations in the weather will result in differences. If you think the "correction" factor is 100% accurate and will correct for temeprature/humidity etc... well, it doesn't, not perfectly anyway. Also... it has been shown that how a car is strapped down can affect results. So... make your changes, make a pull... it is better or worse? Repeat until you have reached the maximum amount of power you are willing to make for a given octane and safety threshold.

If one wants to believe one has more horsepower so one can compare oneself to what others have than you need the type of help that is not regulary and readily availale on this forum!
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