380 HP - 583 TRQ ??? Mustang Dyno

[JBushman73]

Just had mine on the Mustang Dynamometer. My graph reads 380HP and 538 Ftlb of engine torque.

To me that torque number can't be right. What could be the issue with it reading so high?

All I have is an 8lb procharger and exhaust.

 

[darkside03gt]

could be the way the parameters of the dyno are set up.

I have heard of dyno shops messing with the parameters in order to make you think you gained a bunch of hp from one of their tunes when you only really gained like 10hp. One guy i talked to claimed 45hp from a custom tune on a almost stock gt.

 

[40th GT]

Wow..that's

 

[ttop88]

My guess would be torque multiplication. Your car an automatic?

 

[Screamin' Demon]

I was there to witness this. Its rather strange

 

[bdcardinal]

how were they measuring rpm? when i had the mustang dyno'd they had some weird way of measuring it and one of the guys in my club made 850ft-lbs and 50hp on a hci 95 cobra.

 

[ttop88]

Is the car an automatic?

 

[Screamin' Demon]

His car is not an auto. My buddies trq. was wayy up and hrp seemed way too low and this is a turb 5 spd car. Another LS2 GTO w/ swapped heads and supercharger was also low on hp.

 

[ttop88]

Parameters of the dyno are way the hell off then.

 

[JBushman73]

Its a 5 speed. The guys doing the dyno didn't measure RPMs.

The sheet shows:

Total torque (Ft-lbs) 783 Max

Eng Torque T WC (Ft-lb) 538 Max

Eng Power T WC (HP) 380 Max

The torque is definitely not correct, and now I question the actual HP number too. Oh well. Thanks for the responses. Bushman out!

 

[jivepepper]

That's why I never liked a Mustang dyno. To easy to screw with the numbers.

 

[Stan Weiss]

Horsepower (HP) = (Torque x RPM)/5252
They need to measure RPM

Do you have any kind of printout from the dyno run?

 

[bdcardinal]

ya how can you not measure RPM? i can see maybe using the OBD2 connector, but as stated you cannot get hp numbers without RPM. in generaly i dont like dyno's for hp and tq numbers. all they are for is to brag online and at car meets. plus most tuners ive seen are just interested in high numbers and WOT pulls. good tuners care about that and normal drivability.

 

[JBushman73]

Horsepower (HP) = (Torque x RPM)/5252
They need to measure RPM

Do you have any kind of printout from the dyno run?

If 380 HP is correct............. I shut down the car when the HP graph dropped and that was at exactly 5k rpms. The dyno guy yelled the second the HP dropped and my tach was at 5k. Using the formula above I came up with..........

400 TRQ X 5000rpms/5252 = 380 HP

Until I can get to another dyno day, I'll have to go with having 380HP 400TRQ.

I've got the printout but I don't have a scanner and taking a digital doesn't show very well.

 

[04YELLOWGT]

That's why I never liked a Mustang dyno. To easy to screw with the numbers.

Mustang dynos are the only way you can really tune a car unless you’re at a track or on some back road with a computer. They also give you more real life numbers than a dynojet (unless the dynojet is loaded, which most aren't). Dynojets are more of a bragging rights dyno since you can't add a load to them. That is the reason Dynojets always read 30-40+ higher than a mustang dyno.

This is also assuming that the mustang dyno is configured right.

 

[ADRENLN]

mustang dynos are useless. any thing the operator enters can throw the thing off.

 

[Rick 91GT]

Mustang dynos are the only way you can really tune a car unless you’re at a track or on some back road with a computer. They also give you more real life numbers than a dynojet (unless the dynojet is loaded, which most aren't). Dynojets are more of a bragging rights dyno since you can't add a load to them. That is the reason Dynojets always read 30-40+ higher than a mustang dyno.

This is also assuming that the mustang dyno is configured right.

100% correct.... I find the tune coming off a proper set MD is way more accurate then the DynoJet.

 

[Stan Weiss]

If 380 HP is correct............. I shut down the car when the HP graph dropped and that was at exactly 5k rpms. The dyno guy yelled the second the HP dropped and my tach was at 5k. Using the formula above I came up with..........

400 TRQ X 5000rpms/5252 = 380 HP

Until I can get to another dyno day, I'll have to go with having 380HP 400TRQ.

I've got the printout but I don't have a scanner and taking a digital doesn't show very well.

Doesn't your printout tell you at what RPM you made what Torque and HP? If you are off by a few hundred RPM the troque goes up, and the 538 starts to look more real.
5000 = 399.2
4900 = 407.3
4800 = 415.8
4700 = 424.7

 

[jivepepper]

Mustang dynos are the only way you can really tune a car unless you’re at a track or on some back road with a computer. They also give you more real life numbers than a dynojet (unless the dynojet is loaded, which most aren't). Dynojets are more of a bragging rights dyno since you can't add a load to them. That is the reason Dynojets always read 30-40+ higher than a mustang dyno.

This is also assuming that the mustang dyno is configured right.

Well I guess for the last 4 years I have never been tuned correctly it's amazing it still holds together. I actually trap higher the my dyno numbers wouls suggest. A mustang dyno can read anything it wants since it's operator manipulated.

mustang dynos are useless. any thing the operator enters can throw the thing off.

There not useless just the numberes vary to much from one to another. They are fine for tuning.

 

[TGJ]

Mustang dynos are the only way you can really tune a car unless you’re at a track or on some back road with a computer. They also give you more real life numbers than a dynojet (unless the dynojet is loaded, which most aren't). Dynojets are more of a bragging rights dyno since you can't add a load to them. That is the reason Dynojets always read 30-40+ higher than a mustang dyno.

This is also assuming that the mustang dyno is configured right.

Most of the Dyno-Jets out there have load-bearing capability that a Mustang Dyno has, those that don't have an upgrade option for this. These Dyno-Jets are far better for tuning than Mustang Dyno's are. You put them in load-bearing mode and tune the car like you would on a Mustang Dyno. Then you switch them over to Inertia mode for the money shot. These Dyno-Jets in load bearing mode have the same inherit fault that Mustang Dyno's, you can fudge the numbers as you feel fit.