Mustang & Dynojet?
There is no set percentage difference. Mustang dyno's take into account weather conditions, which obviously vary from hour to hour so there is no way to have a set percentage to calculate.
I've seen as little as 3 percent and as high as 15 personally.
I've seen as little as 3 percent and as high as 15 personally.
Thread Starter
Staging Lane
Joined: Oct 2005
Posts: 71
Likes: 0
From: houston,tx
The reason I'm asking is because my car made 480rwhp@5.5psi on a dynojet and took it to a different shop to up the boost and retune. Now its making 503rwhp@12psi on Mustang dyno. The hp doesnt look like it went up much with the extra 6.5psi. So I was wondering what the difference is between the two.
TECH Addict
Joined: Jun 2005
Posts: 2,660
Likes: 14
From: England
Originally Posted by The Reapar
There is no set percentage difference. Mustang dyno's take into account weather conditions, which obviously vary from hour to hour so there is no way to have a set percentage to calculate.
I've seen as little as 3 percent and as high as 15 personally.
I've seen as little as 3 percent and as high as 15 personally.
Mustang Dyno's have no more to do with the wheather than HBO does.
Correction factors such as SAE correct for that sort of thing.
Mustang Dyno's are load bearing dyno's whereas most dynojets are inertia dyno's. This means as a rule Mustang dyno's will better represent comparable numbers to SAE Net as quoted by the manufacturers, once you have accounted for drive train loss anyhow.
Mustang dyno's will show lower, but more realistic numbers than Dynojets. And they are also better for tuning.
A formula I found is:
Dynojet Hp / 1.07 = Mustang Dyno HP
Not sure of the origins behind the formula, but from observations it seems to actually work pretty well. So 503rwhp on a Mustang Dyno is ~538rwhp on a Dynojet.
Do watch for STD and SAE correction as well as Graph smoothing. All of these can significantly alter the numbers produced.
Search this forum there was a really good thread about Dyno types a week back or so.
Well .....on an old set up of mine i was on a dyno jet and got 395hp 372tq. one week later with no mod changes i went to a mustang dyno and got 370hp 351tq. i now always use the same mustang dyno when i need a re-tune. my car now is at 463hp 414tq on the same mustang dyno.
12 Second Club
Joined: Jun 2005
Posts: 1,119
Likes: 0
From: Chitown
Depends alot on how the dyno is tuned in.... on the Mustang/Dynojet war I really like mustangs cause of the load. But if you have done weight reduction its best to know your weight or the tunner will put in your stock weight.
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Go to dyno forums......I posted this thread a month ago....dynocar and everyoe else has saide the same thing over and over...It's called mustang vs other dynos....and for my 2 cents, dyno jets usually produce higher #'s...go to the track....dynos are good tuning tools..
