[limited]

Just had my car dyno'd on a mustang dyno (hitting rev limiter@5800) and got 424/460, what would that be on a dyno jet?

More interested in people that have dyno'd on both, but any idea would be appreciated

[Willy Mo]

honestly it depends on how the dyno's are "loaded". Tuners can load them light or heavy. But usually dynojets have dynoed a little higher in MY experience. Maybe 5-10hp

[Black Bullitt]

Originally Posted by limited Just had my car dyno'd on a mustang dyno (hitting rev limiter@5800) and got 424/460, what would that be on a dyno jet? More interested in people that have dyno'd on both, but any idea would be appreciated

Nice numbers. Dyno sheet? Sorry can't help you on the conversion.

[limited]

Originally Posted by Willy Mo honestly it depends on how the dyno's are "loaded". Tuners can load them light or heavy. But usually dynojets have dynoed a little higher in MY experience. Maybe 5-10hp

Watched them input info, they even put my car down as weghing 3800#, it was a dyno day and #'s seemed about par with what was dyno'd and what they had done before

[JakeM]

There really is no "conversion".... Remember the dyno is just a tool to dail your car in. People get to stuck on the numbers... Take it to the track if you really want to find out what your car is made of... Dyno numbers are just good for bench/internet racing.

[Willy Mo]

I dont think he is worried about high numbers but the difference between the 2 brands od dyno's.

[JakeM]

Why would you care what brand the dyno is? As long as it is one of the big three anyway?

Also, if Joe did his tune he has nothing to worry about anyway. Joe is awesome.

[limited]

Originally Posted by Black Bullitt Nice numbers. Dyno sheet? Sorry can't help you on the conversion.

no scanner, but the hp curve was climbing til it hit limiter and the torque curve,should I say lack of, was flat as hell,from what I can tell from sheet it was at 450 @ 2000 staying flat till ~4200 then dropping to ~420 then finally falling to ~395 @ 5800

[gragra73]

I have heard that the difference is 11-12%.

[Bullitt5339]

Yeah, even the same dyno brand and models don't read the same. The Mustang dyno can be manipulated by the operator to read pretty much whatever they want.

A good example is my car a couple years ago:

On 3 different DynoJets within a month, with the same car, same mods:

BWR - 256rwhp
Comp Auto - 262rwhp
ProDyno - 271 rwhp

As long as you use the same dyno, with the same setup in it for every run, it's a tool to compare how well your mods are doing, and the current state of your tune.

[limited]

Originally Posted by JakeM Why would you care what brand the dyno is? As long as it is one of the big three anyway? Also, if Joe did his tune he has nothing to worry about anyway. Joe is awesome.

\
curious, why not. it does help knowing, remember I am on stock long block. 424hp is safe on a dynojet, just getting an idea on what to compare to on a popular dyno

[limited]

Originally Posted by gragra73 I have heard that the difference is 11-12%.

Thats what I am afraid of, that would put me in a different cat. with stock LB

[JakeM]

You can't say this number is safe or that number is safe... People get hung up on the numbers. The numbers mean nothing really. You want a safe tune, numbers be damned. Some people have been running on tunes nearing 500rwhp for years. Are thier tunes unsafe? Even though they have been running them for years? Sure, generally around over 450RWHP on a stock two valve is the limit. But a dyno operator can manipulate the numbers to read whatever he wants. Again, the key is that you have a good tune. If you have a good tune, who cares what your numbers are as long as you are happy with the car, right?

Don't get me wrong, you can strap your car down to a hundred dyno's if you want. But its a fruitless effort. Because the numbers really do mean nothing but bragging rights. The only true real world measure of how much power your car has is time slips. If you are truly worried about reliability you should never have installed forced induction on your car. Its a risk you take once you add more than factory power.

[tbirdscwd]

It depends entirely on how the tuner sets up the load for your car and on the calibration of other dyno. On average, mustang dynos read a bit lower than dynojets because mustang dynos increase load in accordance with speed to take into accound wind resistance whereas the load placed on a car running on a dynojet is constant.

[JakeM]

Originally Posted by tbirdscwd It depends entirely on how the tuner sets up the load for your car and on the calibration of other dyno. On average, mustang dynos read a bit lower than dynojets because mustang dynos increase load in accordance with speed to take into accound wind resistance whereas the load placed on a car running on a dynojet is constant.

Thats not entirely true. You can set up a dynojet to "load up" like a mustang dyno. I have a spreadsheet that basically gives you a step by step on how to get a loaded dynojet to introduce load in the same method as a Mustang dyno.

In my experience, fewer tuners that have dynojets actually cough up the extra money for load cells and they are just statically loaded. Via the weight in the drum. Where as Mustangdyno's come standard with load cells.

I don't have my flash drive with me right this second, but if you want the spreadsheet PM me. I can send it to you. (Goes for anyone)

[limited]

Originally Posted by JakeM You can't say this number is safe or that number is safe... People get hung up on the numbers. The numbers mean nothing really. You want a safe tune, numbers be damned. Some people have been running on tunes nearing 500rwhp for years. Are thier tunes unsafe? Even though they have been running them for years? Sure, generally around over 450RWHP on a stock two valve is the limit. But a dyno operator can manipulate the numbers to read whatever he wants. Again, the key is that you have a good tune. If you have a good tune, who cares what your numbers are as long as you are happy with the car, right? Don't get me wrong, you can strap your car down to a hundred dyno's if you want. But its a fruitless effort. Because the numbers really do mean nothing but bragging rights. The only true real world measure of how much power your car has is time slips. If you are truly worried about reliability you should never have installed forced induction on your car. Its a risk you take once you add more than factory power.

I am not worried about bragging rights or #'s. This is the first time my car has ever been on a dyno(2 years on this set-up), did it because it was cheap(dyno day) All the posts I read of 2v breaking has had dyno jet #'S. This was Joes conservative tune and he left parameters open for me to adjust, so comparable #'s are beneficial to me

[roush02]

Originally Posted by Bullitt5339 Yeah, even the same dyno brand and models don't read the same. The Mustang dyno can be manipulated by the operator to read pretty much whatever they want. A good example is my car a couple years ago: On 3 different DynoJets within a month, with the same car, same mods: BWR - 256rwhp Comp Auto - 262rwhp ProDyno - 271 rwhp As long as you use the same dyno, with the same setup in it for every run, it's a tool to compare how well your mods are doing, and the current state of your tune.

I had almost 40 hp differance on two dynojet dynos. Like someone else said take it too the track if you really want to know.

[tbirdscwd]

That is really good to know Jake. I was always told (by many dyno tuners themselves) that the dynojets are not able to adjust the load on the car. The tq readings are determined by how fast a car can accelerate the weighted drums vs a brake type drum setup where the load is introduced based on specific inputs. I would be interested to see how this is achieved.

[JakeM]

Originally Posted by limited I am not worried about bragging rights or #'s. This is the first time my car has ever been on a dyno, did it because it was cheap(dyno day) All the posts I read of 2v breaking has had dyno jet #'S. This was Joes conservative tune and he left parameters open for me to adjust so comparable #'s are benificial to me

LoL.. Ok, but what I am saying is that the numbers mean nothing... Dynojet or not........ All those posts about 2v's breaking on dynojets with dynojet numbers mean nothing. Why are comparable numbers benificial to you? The tune on all those cars that broke is more than likely vastly differen't than your tune. Therefore, the numbers are useless. Because those cars broke at "X" amount of horsepower does not mean your car will or will not break at "X" amount of horsepower as well. This is what I'm getting at. Comparing the numbers is going to do nothing for you but make you worry needlessly or overconfident.

[Bullitt5339]

Originally Posted by limited I am not worried about bragging rights or #'s. This is the first time my car has ever been on a dyno(2 years on this set-up), did it because it was cheap(dyno day) All the posts I read of 2v breaking has had dyno jet #'S. This was Joes conservative tune and he left parameters open for me to adjust, so comparable #'s are beneficial to me

Whether it's 424 or 444rwhp, your chances of breaking something are the same. I've seen plenty of cars with Dynojet dyno sheets and awesome tunes with 420rwhp grenade just like 450rwhp cars.

The point is, the difference isn't enough to matter when dealing with longevity.