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Old 06-29-2006, 03:00 PM   #1
firemanfrank
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"Dynapack" dyno numbers in!

Just had my car up on a Dynapack chassis dyno (wheels come off, hooks directly to the car's hubs):

127.4 hp
142.2 lbft torque




I'm VERY pleased with the torque figures, but the hp numbers seem to be more than just a bit off. The engine's hp/torque numbers should be running pretty close, but a 15 hp difference tells me something might not be right here.

I went with AutoOutcast, and his hp vs. torque numbers seem to be off as well (116.8 hp/134.3 tq.- modded ztec). This seems to be raising a few eyebrows on his thread as well ...

place your bets now!

So because of what AutoOutcast got, I am pretty sure that it is not my car. Anyone know anything about the "Dynapack" chassis Dyno? Is this a common result with their equipment?

I mean, ZX3chick made 129 hp/134 lbft torque on her stock ST. Now that's much more normal of a difference between hp/torque than with my result of 127/142.

Chime in peeps! Give me a hint as to what might be up with mine and AuotOutcast's dyno numbers!

(BTW, can't say enough good things about the people at SynapseMotorsport. They were pleasant, helpful, and professional!)

Pics From Today!

Travis (AutoOutcast) getting his car dynoed!

Morgan (operator/owner of Synapse Motorspots), Travis, and Chris (employee, Synapse M/S)

The ST getting put on the dyno!

Morgan, putting my car through a run!

The ST, getting plenty of air!

Travis, monitoring his car's results on the computer!



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Old 06-29-2006, 03:06 PM   #2
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Remember, those dynos are 10%-15% lower than a Dynojet and other "roller" type dynos that most of the dyno figures on here are from.

Good work.
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Old 06-29-2006, 03:14 PM   #3
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Quote:
Originally posted by Goat Roper
Remember, those dynos are 10%-15% lower than a Dynojet and other "roller" type dynos that most of the dyno figures on here are from.

Good work.
Thanks buddy! But please, tell me more about this hp difference?

I didn't know that dynos could be that much off from one another.

Do you know why this is? And why so much separation between the hp and torque numbers?

Just curious!
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Old 06-29-2006, 04:28 PM   #4
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It all depends on the dyno operator. I'd assume there is a correction factor for what wheel normally would have been on the car?
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Old 06-29-2006, 04:36 PM   #5
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Find you a real dyno (dynojet) this way every time you go back they will be correct 2 Diff guys running the dyno you will get 2 Diff dyno # with the dyno pac

Find a dynojet

Tom
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Old 06-29-2006, 05:54 PM   #6
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Quote:
Originally posted by 1turbofocus
Find you a real dyno (dynojet) this way every time you go back they will be correct 2 Diff guys running the dyno you will get 2 Diff dyno # with the dyno pac

Find a dynojet
Tom
LOL

There's a Dyno Dynamics 450 just 2 minutes from my house.

Problem is, I heard the guy just wants to do Vette's, GTO's, and stuff ...

So that's probably why, when I talked to him, he won't bend on a flat $250 per car for one full hour.

And there ain't no way I'm gonna pay $250 for just a couple of dyno runs!
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Old 06-29-2006, 09:50 PM   #7
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The Dyno Dynamics 450 isnt much better then the dynopac you did your dyno on , Look on the dynojet web site and see if there is one close to you

Tom
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Old 06-29-2006, 11:15 PM   #8
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tom the closest dynojet to us in upstate ny is somewhere around syracuse or bristol dyno in connecticut... while they may read higher i verified my a/f ratio and im content with my runs. morgan (operator of synapse) told us 75$ for 3 runs.... each of us got 5 or 6 pulls so he could get a quality baseline and truly see how the car was.
now if the 10-15% estimate of a dynapack reading lower is correct at a 15% correction for a dynojet, it puts me at 134hp and 153tq to the wheels...and if thats true... goddamn.....
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Old 06-30-2006, 12:35 AM   #9
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so if he already has a 15 percent drivetrain loss and then the 15 % lower because of the dynapack, then the 117/134 is a little bit more than what i would have on a real dyno because of the 30 % drivetrain loss b/c of the ATX...right? or am i just stupid and cant calculate...if so i'm a little discouraged of even trying to mod my lame ass atx :(
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Old 06-30-2006, 08:40 AM   #10
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Quote:
Originally posted by Auto0utcast
tom the closest dynojet to us in upstate ny is somewhere around syracuse or bristol dyno in connecticut...
Actually, there's one even closer: Walden, NY - 102 mi (1 hour 57 mins)

In distance, the other two are:

Bristol, Conn. - 120 mi (2 hours 35 mins)
North Syracuse, NY - 128 mi (2 hours 11 mins)

Quote:
... while they may read higher i verified my a/f ratio and im content with my runs. morgan (operator of synapse) told us 75$ for 3 runs.... each of us got 5 or 6 pulls so he could get a quality baseline and truly see how the car was.
Yeah, it was good to know that my A/F wasn't out of wack either (though they said that I probably could lean it up a bit). I got a total of 4 runs in (3 runs in 3rd gear, 1 run in 4th).

Quote:
... now if the 10-15% estimate of a dynapack reading lower is correct at a 15% correction for a dynojet, it puts me at 134hp and 153tq to the wheels...
So if I adjust for the 15%, does that mean that I'm actually making 146hp/163 trqe to the wheels? Not likely (all I have is just a CAI/Cat back).

But as I said previously, the thing that REALLY gets me is the RATIO betwen the hp and torque. It doesn't seem right?

If Ford lists my engine as making 151hp/154trq (almost a perfectly equal 1:1), then how in the heck am I now making 127hp/142trq to the wheels?

It's as if I've mechanically changed the dynamics of how my engine produces power/torque (which a CAI/Catback doesn't do).

Something doesn't jive here. The way I figure it, if the Dynapack's hp figure of 127 is the one that is correct, then my numbers should read 127fwhp/130fwtrq (whaaa!).

But if the Dynapack's torque number of 142 is right one, then my results should have been 139fwhp/142fwtrq (yippie!).

Phil Usher (who has an ST and is running a Website Journal on his car's mods) got 130fwhp/135fwtrq stock on a Dynojet. This ratio lines up PERFECTLY with how the engine is supposed to be producing "hp. versus trq".

Then, when Phil added a CAI/Tune, his numbers were 141fwhp/145fwtrq. AGAIN, his hp/trq ratios jive!

Hmmm. The Dynojets are what, only 2 hrs. away?
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