dyno numbers i can't believe, check this out!

[mr.b]

ok, i just dynoed the stang at my friends' shop. This is on a mustang dyno that is about 6 months old. My car is a bone stock 91 gt 5 speed, 68,000 miles, with weld in 3 chamber flowmasters. Smog, ac, 87 octane, 8 degrees timing, cats, air pump, silencer still in it, the whole deal. It made 245 hp and 292 ft-lbs at the wheel. I couldn't believe it and they were skeptical too. We ended up making 7 total pulls and they were all within 8 wheel horsepower. They even rebooted the machine on one of them. The machine had also be recalibrated about a week ago. The last time they dynoed a car was about 3 days ago, a stroked windsor with a procharger and a glide that made 480 at the wheel, which seems right for what he had. So, let me hear what you guys have to think about this.

Oh yea, these guys did not inflate any numbers, i have been friends with them for a long time. I knew the exact weight of the car also, 3360 me in it.
I drove the car each time and watched the dyno read outs and the afr, which was on the rich side (11.8-12.0).

 

[RYC CUKR]

I got some high dyno #s one time and found out what had happened. They had entered the wrong rear gear ratio. They set it up for 3.08s when the car had 3.27s in it. That made my numbers a little high. 245 at the wheel sounds like a lot for basically a stock Mustang with only 8 degrees of timing.

 

[FiveOfastback]

I got some high dyno #s one time and found out what had happened. They had entered the wrong rear gear ratio. They set it up for 3.08s when the car had 3.27s in it. That made my numbers a little high. 245 at the wheel sounds like a lot for basically a stock Mustang with only 8 degrees of timing.

Great point about gear ratio, I beleive that is a factor when setting up the dyno for a pull. Also what gear was the car in, when they did the pull?

 

[mattkimsey]

haha, thats like 270rwhp on a dynojet.

 

[Look Its Aaron]

hm, you are not the only one who doesn't believe those numbers.

Maybe you have gt40 heads and dont know it?

 

[mr.b]

the rear gear doesn't really matter with affecting hp's that much. look here read the one about differential gear change
my car was in fourth when i did all pulls.


http://www.mustangdyne.com/faq.htm

 

[JUCD 5.0]

Haha IF your stang is completely stock which it either isnt or the Dyno is WRONG a 91 GT only has 225 Hp stock so how in the world would you pull 245 hp on a 14 year old car is beyond me. !
1. it isnt stock or
2. That dyno is screwed up
I'm not tryin to be negative but thats not to believeable sorry.

 

[mr.b]

i am looking for reasons why, obviously i know what numbers it is supposed to make.

 

[JUCD 5.0]

Maybe you got some goodies under that hood you may not know about??

 

[mr.b]

not quite

 

[RacEoHolic330]

a 91 GT only has 225 Hp stock

And that's at the flywheel too. So it's around 195 stock at the wheels

I'll be the first to throw the flag

 

[GroverDill]

messed up calibration on the dyno.

JBA here in San Diego has a overly friendly dyno as well.

 

[mr.b]

why do you have to throw the bs flag? i am telling you what numbers i got and that i am questioning them. it's not like i am saying i have some beast, factory freak, crap like some people would say. i am just trying to figure out how the dyno could possible read to high. just some informative answers to this question would be appreciated.

like i said, we put in the correct weight, the correct drag coefficient, and rebooted the machine

it would be nice if there were some dyno operators on here that could give some advice.

 

[jackchan]

sounds like to me that a dyno guy could fudge on horsepower whenever they wanted to make people think you they had more power than they actually did...........in a chip tuner situation.....now that isnt funny one bit. Kinda pisses me off!

not knocking on your car, but why would you do 7 dyno pulls and not remove your air silencer nor advance your timing on any of the latter runs?
Jack

 

[RacEoHolic330]

I know, you're not lying. You saw what you saw. I just wanted to throw the flag before anyone else did eventually.

What you should do is throw the car on another dyno and see what kind of numbers you get out of it. That will tell you if your friend's dyno is screwy

 

[mr.b]

i did remove the air filter,picked up 3 hp. turned the timing to 12 degrees, no extra power was recorded, but this could be because of the 87 octane fuel. i just didn't feel like typing about how i picked up 3 beast horsepower by pulling the filter out when it was already reading high.

 

[jackchan]

ahhh. kewl hey posts those dyno sheets.......we love pics! when we dynoed a customers car we ran up to around 3000 then punched it. in 4th gear which was one to one ratio............what gear did you do your pulls in?
Jack

 

[mr.b]

scanner is at work, only thing i can do here is take a digital cam pic which may not be to clear, i will see how it does and possibly put that on here

 

[Daggar]

Sorry man... the bottom line is that the dyno result you got is wrong. I've seen stock motors with power adders and complete exhaust systems put down roughly 260 to 270 at the wheels. That's running between 6 and 8 lbs of boost with no other real mods. For your motor to put down those kinds of number without forced induction or nitrous just isn't going to happen. About the only thing that dyno graph might be good for is posting onto your window for bragging rights. hehe

 

[DMAN302]

definately wrong..may feel good, but not real numbers for any stock or bolt on 302 without a set of heads.