My best friend dynoed on a Mustang dyno then a Dynojet and was only 3 rwhp higher on the dynojet with his 03 cobra.

 

wow, I am surprised, I have always heard for years how mustang dyno's put out much lower numbers...like someone said...about 15% or so...

Hmm, thats interesting.

 

They are, someone did a write up on this a while ago. If I had more time I would search for it and post it. Mustang Dynos are technically more accurate but since few use them right now, they are considered "low". You will see less RHWP. Something was wrong with your friends 03 Cobra at one of the occasions (or right, whichever way you look at it).

-Todd

 

The dyno's were 2 days apart. 367rwhp Mustang Dyno, 370rwhp Dynojet. We were told by the shop with the Mustang dyno that they gave the same #'s, but the Mustang dyno could do other things. i.e., track times, loads etc.,

 

They read numbers differently from the car. I will find this thing now, if anyone else has it, post it!

-Todd

 

Here is an article on the differences between a Mustang and Dyno-jet.

Chevy High Performance June-2003

In that article they compare a Dyno-jet 248 and a Mustang MD-250. The car they used was a 2000 Z28 M6.

Here is a quote from the article.. "The Dynojet measured 5.1 percent higher horsepower in Fourth gear, 7 percent higher horsepower in Third gear, and 8.2 percent higher horsepower in Second gear."

Here is a jpg of the raw numbers on that test.


As you may or may not know, the Mustang Dyno adds resistance to the rollers using a very large electric brake called an eddy current. One of the factors it takes into account when adding the load to the vehicle being tested is the aerodynamic drag coefficient. The lower the drag of the car being tested, the closer the numbers will be to the dyno-jet numbers. On the mustang the load added to the car is represented by a calculation of how much horsepwer the car requires to run at 50 mph on a flat surface. However, the drag coefficient is not the only thing factored into this number, it also includes rolling resistance, and several other factors that I dont know. Mustang guards this calculation fairly closely and would not give me the break down.

On a 98 ls1 A4 camaro the hp at 50 number is 12.4. As a point of reference, a 97 lt1 A4 is 13.2, so obviously the dyno is adding less load to the ls1 due to it being a little more efficient set up at speed. Thus the differences shown between the mustang and the dyno-jet will be smaller.

Back to the matter at hand. The car dynoed 299 stock. Using the CHP magazine numbers that would put it at 314 on a dyno-jet.

The ls1-tech database is not cooperating right now so I had to go to the evil ls1.com site to get some stock numbers. Stock ls1's are dynoing between 291 and 322 as shown in this thread. We all know that ls1's vary widely in hp numbers stock. This car is about in the midrange of those numbers if you use the CHP articles 5.1% number.

I hope this helps address the bullshit claims, but as the CHP article says "The bottom line: dyno numbers are for show, and track times are for the dough!" We are taking the car to the track on tuesday, if the weather clears up, and the numbers will be posted in this thread.

Mike

 

All dyno's have different results. Dyno's are tuning tools and to see that mods are working numbers mean nothing! it is the track performance that matters. The Dyno is a tuning tool that is all it is for tuning and to make sure everything is ok. So I believe the numbers the man is saying he has no reaon to lie.

 

I feel like im at panchos, rasing the flag up

 

Finally

I read through this whole post, and everybody who was responding was completely missing the point. I know Mike, and I know this wasn't posted as a, "Hey, look at the numbers this car put down..." He just wanted to show the mod for mod HP gain, something that people regularly ask for. It's cool when you can slap a mod on a car and have some kind of documented proof of how much HP you can gain with it.

BTW Don, glad you dropped the snake for another LS1.

 

I am the other owner of The Horsepower Factory. From what I can see, alot of the people calling bullshit are running in the 13's. I have been building and racing cars for almost 20 years. I was also one of the first members on this board to run mid 10's in a full weight 2000 firehawk with a stock rotating assembly, heads, cam, and a 100shot. My point being, this car is going to the track tomorrow night(weather permitting), it WILL put up the numbers that the owner wants. That is how confident in this car that I am. All the naesayers about this will be hard-pressed to argue with timeslips. I have had other customers dyno their car on our mustang and then dyno it on a dynojet and their numbers are usually with 7% of each other. Believe it or not, that is what the car put down. For those who still want to call bullshit, feel free to come on down and try out the dyno for yourself.

 

I think the only thing anyone is questioning is the stock numbers nothing else, only for the fact that is an auto on a mustang dyno.

All the gains seem about right..some even seem a little low.

 

check out car craft this month. They put a stock ls1 crate motor on an engine dyno and it made 401hp. Even figuring a 20% drivetrain loss through the 4l60e, that is 320.

 

Well we got rained out last night... so I guess the proof will have to wait until next season.

 

I call b.s. on those actually being the numbers. However, I don't call b.s. on it actually dynoing that.. every dyno is different.. That could very well be uncorrected as well.

It is next to impossible for the car to make 350rwhp in an automatic with boltons on a Mustang dyno.. there are CAMMED automatics that don't even make that on a Mustang. Its obvious that this particular dyno is different than the others.

Peace,
Josh

 

I put down 316 and 341 w/a lid and cut out, does that mean i have a MIGHTY 98? its and auto too

 

Was that on a Mustang dyno?

 

Dynojet

 

so holy **** your car would be like 304ish with a 98 bs your lying no way Comeon poeple stop with the bs flags accept the knowledge shut up and learn. Noone has a reason to lie maybe his dyno is generous does it matter not one freaking bit.

 

Yes it does matter otherwise numbers have no meaning at all. In fact, I notice you have them in your sig...why?? Because if "it does not matter one freaking bit" if they are even accurate or not, than whats the point on even listing them??

 

I think that he is saying that the point of the thread was to show the gains from particular mods, and that the base numbers dont really affect that.