My Dyno Results

[Twitch] · Sep 17, 2005

It was dyno day at a local shop so I said why not try.

It was raining today with humidity at 94% and temperature of 59F. Also, the dyno used was a MAHA dyno.

My mods:
- Mac ProChamber O/R
- Diablosport Predator
- Granatelli Intake Plenum
- Homemade CAI(I doubt that helped at all)

As you can see, Im running REALLY rich, 12:1 to 11:1 A/F ratio. I'm going have to lean it out with Predator and go back for another run.

So, what do you guys think?

Maza4ever14 · Sep 17, 2005

wow thats cool they even have ur flywheel hp and trq

ADRENLN · Sep 17, 2005

weird i never saw that before!!!

LI98GTStang · Sep 17, 2005

That a/f really tails off there in the upper rpms. I'm suprised that the out of the box tune from Diablosport does that. Wonder what the stock tune would look like?

[Twitch] · Sep 17, 2005

LI98GTStang said:
That a/f really tails off there in the upper rpms. I'm suprised that the out of the box tune from Diablosport does that. Wonder what the stock tune would look like?

Anyone have any idea what could cause it to run rich, because my mods are supposed to make it run leaner(CAI, Intake Plenum)?

I talk to the guys who did my dyno, he suggested me to lean it out around 5%.

twogts4us · Sep 17, 2005

Maza4ever14 said:
wow thats cool they even have ur flywheel hp and trq

It's simply a calculation / estimate / educated guess. It's about as valuable as those internet equations that go something like this:
"This is amazing - try this on a calculator...multiply the first three digits of your phone number times 3. Then multiply the last four digits of your phone number times 2. Then divide the first number by 3 and the second number by 2. What do you have? It's YOUR phone number - Oh My God, how does that work?!?!"

hotmustang331 · Sep 18, 2005

Thats definatly odd. Your HP should be higher,but maybe its the dyno.

AND WHY ON EARTH DID HE STOP AT 4500RPMS?!?!?!!?! You would have made more power lol...at least take it to 5500. these cars peak at around 4800....on my dyno before the cams I had the guy pull it to 6K. Not sure what Tim pulled it to after the cams, because he still hasnt emailed it to me lol.

IMO you should go to a dyno jet and pull it to 5800, its not going to hurt anything. BTW congrats on the #s.

[Twitch] · Sep 18, 2005

hotmustang331 said:
Thats definatly odd. Your HP should be higher,but maybe its the dyno.

AND WHY ON EARTH DID HE STOP AT 4500RPMS?!?!?!!?! You would have made more power lol...at least take it to 5500. these cars peak at around 4800....on my dyno before the cams I had the guy pull it to 6K. Not sure what Tim pulled it to after the cams, because he still hasnt emailed it to me lol.

IMO you should go to a dyno jet and pull it to 5800, its not going to hurt anything. BTW congrats on the #s.

I know, I even told him my redline but for some reason he stopped at like 4500

hotmustang331 · Sep 18, 2005

He must be really old school lol, and he just made you throw your money away by not pulling it to ATLEAST its peak HP. Call up some local dealerships and ask if they have a dyno. Alot do, and it costs around $60 for two pulls. Well worth it IMO, because I dont trust the above A/F reading....I think its wrong. My A/F was around 14-15 before the cams....I had full exhaust, and some intake work...but I had a chip so maybe that what leaned it so much. Anyways, good luck.

[Twitch] · Sep 18, 2005

hotmustang331 said:
He must be really old school lol, and he just made you throw your money away by not pulling it to ATLEAST its peak HP. Call up some local dealerships and ask if they have a dyno. Alot do, and it costs around $60 for two pulls. Well worth it IMO, because I dont trust the above A/F reading....I think its wrong. My A/F was around 14-15 before the cams....I had full exhaust, and some intake work...but I had a chip so maybe that what leaned it so much. Anyways, good luck.

Costed me only 40$ for 3 runs that days since it was Dyno day. He was using LM-1 Wideband O2 Digital Air/fuel Ratio Meter with a sniffer since I have no cats. Normal rates are 60$ like you said. I'm going to have to go back again to tet again, but this time, all the way to 5700rpm.

[Twitch] · Sep 18, 2005

Here's something weird. A 2005 Mustang GT ran on the same dyno and same shop I went to and here are the results.

I'm supposedly making more HP and torque that a 2005 Mustang GT

billfisher · Sep 18, 2005

most of the dyno's i have read have had the 05 at 272 rwhp.

hotmustang331 · Sep 18, 2005

Yea, somethings wrong....take it elsewhere I dont like the look of these #s, and how everything is looking. Seems like somethings wrong.

deftsound · Sep 18, 2005

yea something is definately wrong haha, im pretty damn sure that 05 should dyno atleast 250

mogs01gt · Sep 19, 2005

that dyno operator should have pulled your car to 6k. You will probably be over 230rwhp

300bhp/ton · Sep 19, 2005

[Twitch] said:
Here's something weird. A 2005 Mustang GT ran on the same dyno and same shop I went to and here are the results.

I'm supposedly making more HP and torque that a 2005 Mustang GT

sadly I think not.

This just looks like a case of a badly ooperated dyno.

The flywheel reading is supposed to be an educated guess, but the dyno will allow the operator to change some of the variable so in reality its just a pointless stab in the dark.

And besides the 05 GT we know will be making 300bhp SAE Net as this is what they are rated at, so any reading significantly lower means a broken car or a dodgy dyno (operator possibly included).

twogts4us · Sep 19, 2005

Yeah, the 05 dyno graph is fudged up - 283 flywheel HP and then 227 RWHP ???? What the hell did they have hooked up to the car - a generator making electrical power for the whole building? A 56 HP loss is out of line...

[Twitch] · Sep 20, 2005

twogts4us said:
It's simply a calculation / estimate / educated guess. It's about as valuable as those internet equations that go something like this:
"This is amazing - try this on a calculator...multiply the first three digits of your phone number times 3. Then multiply the last four digits of your phone number times 2. Then divide the first number by 3 and the second number by 2. What do you have? It's YOUR phone number - Oh My God, how does that work?!?!"

From the shop rep:

the way our dyno works is it calculates the whp...then as soon as you let go of the gaz (the pull) it starts calculating the drag (loss) of the drivetrain...thus giving you an accurate number on your hp at the crank....whp and dyno pulls should be used as a reference for penis size... it a tuning tool....not something to go an brag about.... but hey who I am to think I will change anything in the virtual world of internet car tuning.

forpit2000gt · Sep 20, 2005

does the CAI and Plenum act the sme on 05s as it does on pre 05s as far a leaning a little? The Diablo tune may be mosty of the problem. Why didn't they do a couple of pulls? Where I am you got three.
Pulls made in 4th gear and up to redline.

[Twitch] · Sep 20, 2005

forpit2000gt said:
does the CAI and Plenum act the sme on 05s as it does on pre 05s as far a leaning a little? The Diablo tune may be mosty of the problem. Why didn't they do a couple of pulls? Where I am you got three.
Pulls made in 4th gear and up to redline.

We all did 3 dyno runs.

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