Mustang Dyno - Do's and Don'ts?

[KatDiesel]

Well I get on the Mustang 1750 tommorrow and Wed. Any Do's and Don'ts I should know about regarding this dyno? I have only been on a Mustang once before and just want to make sure everything goes smoothly. Any specific settings I need to tell the operator?

 

[Jim Fulmer]

Yea, give me some input! James and I were thinking today( transmission guy and Jet engine mechanic thinking together..... lol) that I was blowing through the tires and not as much the dyno, guess I should pull a Piers and pile people in the truck bed



Jim

 

[Sled Puller]

Weigh your truck before hand.



Don't get dissapointed if the numbers are lower than a Dyno Jet, the Mustangs are more accurate.

 

[KatDiesel]

Originally posted by Sled Puller

Weigh your truck before hand.



Don't get dissapointed if the numbers are lower than a Dyno Jet, the Mustangs are more accurate.

I know the weight, I also know they read a lil lower. However in my case I'm willing to bet it'll be higher then my last two Dynojet runs

 

[HVAC]

OK, Fess UP

What was your dynojet run???



Better find as much weight as you can to load in the bed.



If you have time you might experiment with running on only *ONE* of the rollers on each side.

 

[John]

A good friend of mine (vendor) has stated several times to me that trucks exceeding 400 BHP do not dyno real well on a Mustang (chassis dyno) as traction (even when strapped down real well) becomes a limiting factor, thereby possibly skewing the real output of the vehicle.

 

[JGK]

Don't get dissapointed if the numbers are lower than a Dyno Jet, the Mustangs are more accurate.

Sled Puller,



Can you elaborate on that statement about the 2 brands? We had a dyno day at a local speed shop in December. He has a DynoJet. He said he did extensive research on these two, as well as others and opted for the DJ. He says Mustang asked DJ to write their software but DJ refused. Said Mustangs are sorta "messy", software-wise, as a result.



I'm no expert and I'm not trying to start any war here. Just trying to understand how these work for more accurate runs in the future.



Thanks,

-Jay

 

[Gary - K7GLD]

IF you're only looking for HP and torque numbers - NOT simulated 1/8th or 1/4 mile times, what does the weight of the vehicle have to do with a dyno reading?

 

[TxDieselKid]

Actually, I THINK I read where Kat said that it was going to be a Mustang 1750, the same, or simular to the one mentioned in THIS thread.



Andrew

 

[MattSt]

HEY! You going down to EJ's? When are you doing the pulls? I would love to stop down and watch and if he has time I would throw the 03 on there to see what it's putting out stock.



Give me a ring if you have time.

 

[RKohn]

A big fan is good for long runs, but you probably won't be on there that long. If ya wanna check your reflexes & your heart, don't chain it down and hop'er off the rolls @ 70mph. Shorter piles of rubber = quicker reaction time.

 

[Sled Puller]

Kat?

Is what Andrew said correct? If it is, traction won't be a problem.



If you guys want detailed answers, e-mail David at Mustang.



-- email address removed --

 

[HVAC]

Weight Vs. Dyno Numbers

Gary, I was schooled by Lawrence of DD regarding dynos. The DJ employs a large single roller on each side which will handle up to 1200 hp without traction problems. All the dual roller dynos (I know of) like the water brake version you would find at Cummins, or the Mustang have trouble with high horsepower trucks unless they weigh 10,000 pounds (not referring to the mustang now) like a commercial tractor. The tires are stressed more then you may know and deflection is caused. I have video of this phenomenon. When this reaches a certain point, the tires lose traction and the readings are skewed. Cummins won't dyno my truck since they know better. They have paid for a few sets of tires in the past and learned a lesson.



So, on the dual roller dynos you can hang in there longer if you put some weight in the truck to help hold it on the rollers.



Anyone, how is the Mustang more accurate then the DJ? I would suggest the DJ is more consistent as we as better at recording higher horsepower runs.

 

[Gary - K7GLD]

Thanks HVAC - I understand the need for weight as far as traction is required - but I suspect that some here think knowing the weight of their truck is necessary in order to obtain accurate dyno readings as far as HP and torque are concerned - not true as *I* understand it... It probably IS important if you want simulated quarter mile times on the dyno - but just for HP and torque, not as far as I understand the process - after all, I doubt they hafta know the weight of just a plain engine on an engine stand in order to obtain proper flywheel HP and torque...

 

[HVAC]

Weight

Yeah, who needs to know the weight for a dyno pull. I have used a G-Tech in which case you need the weight. The G-tech measures time and G-force. The variable is weight. The dyno (DJ) measures acceleration and time. The known constant with the dyno is the weight of the wheels. On a dynojet everybody weighs the same in effect. On the water brake dynos the power is accounted by applying a resistant force while measureing the ability of the engine to counter it.

 

[HeberRam]

Hvac... As I said before,you are the Man!!!



Have you ever thought to have your own TDR tread " just ask HVAC"







Steve

 

[HVAC]

I'm Retiring

Steve, I'm retiring to Morgan Utah to help Clay keep your trucks running properly. Maybe I could write a colume from up there

 

[Sled Puller]

Re: Weight Vs. Dyno Numbers

Originally posted by HVAC

Gary, I was schooled by Lawrence of DD regarding dynos. .

Well, there it is.

That is why Dyno Jets are best.

I was schooled by four different Dyno Jet shops, and wondered if they were all crazy.

I have spun my tires on a Dyno Jet, and I don't have 1200 hp.





Forget the dual roller dynos, they don't hook up.

 

[HVAC]

See

You prolly have 1000 horsepower like Don said. But there's no dyno that will hold you



I thought you might be more interested in why DD is not going to be part of the May Madness celebration this year. Something about nothing for them to prove

 

[JR2]

Nowel,

Say it aint so... DD says they have nothing to prove??? I hope they don't get caught with there pants down by one of the up and comming vendors.....





JR2