Yes ultimate lurker a dynojet does have a Rpm pickup, Thats how it calc. Hp. engine Rpm Vs. roller speed. It's very basic. that's why you want 1:1 to the ground.

 

Asura a dynapack is a very cheap and inacurate Dyno. Most big time tuners use Dynojet or Mustang Dyno. I use a mustand Dyno.

 

Asura a dynapack is a very cheap and inacurate Dyno. Most big time tuners use Dynojet or Mustang Dyno. I use a mustang Dyno.

 

Sorry, I don't follow your logic here. Amuse and UL are both big time tuners. They also both use dynapack. Accuracy and precision are both required to tune a car well.

 

When I mean big time tuners, I mean lingenfelter, Race marque systrems, Comp-tech,vortech, and so on and so on. There is a reason, repeatablilty. I don't mean run after run , I mean running a car then running it a week later and getting almost the same numbers within 2Hp. We could debate the different dyno's all day long. I'm not trying to take anything away from ul or amuse, just trying help answer some questions. I have used both dynojet and mustang dyno, and seen the dynapack in use. I have tuned evryhting form Honda cup challenge cars to Twin turbo NSK's to supercharger Bmw's and has far has accuracy,precision, and repeatabilty mustang dyno in hard to beat. Oh and just tuned Yellow streaks car to 292 rwhp, which would be about 312 on a dynojet.

 

Yeah, the Dynapack is cheap - now you tell me after all that research I did. Sorry 455, but if that was the case, I'd have bought two sets right away instead of saving my pennies to go to an AWD setup.

1. O.k., let's make it simple on the 1:1 gearing thing. What will happen to the reading if you're above 1:1? And below?

2. The Dynapack is not cheap or inaccurate. In fact, they get rather expensive - the cheapest system is $43k (they dropped the price last year), which is quite a bit more than a Dynojet 248 ($27k). Of course, you don't have to dig a hole or buy a lift, so they save money that way. They're also extremely consistent as they eliminate variables. They are capable of measuring variations that most other dynos can not (there's a new unit from Sweden that looks pretty good "rototest" or something). Any time you introduce inertia into the equation (dynojet and mustang), you introduce variability - even the low inertia Mustang has a 2000 lbs equivalent inertia setup. Same goes for having to worry about strap down tension, tire inflation, wheel slip, etc.

3. If you want to talk big time, Dynapacks are now owned by TRD and Ford, and are being used by 'lesser' folks like Apex-i, DC Sports, etc. in developing products. Dynojet owns the market right now thanks to low cost and good marketing, but that doesn't mean they're the best.

I've always said that any dyno can be useful if you know how to use it and control the variables. Its not the tool, its the operator. That said, if you don't know the details, you should choose your words more carefully.

UL

 

[QUOTE]Originally posted by ultimate lurker
[B]Yeah, the Dynapack is cheap - now you tell me after all that research I did.

 

Theoretically, yes. But in the grand scheme of losses, you're talking about a differential in the sub 1% range - which is within run to run variation due to coolant and intake temps, tire friction variations, etc. That's why I'm telling people to look at load time first, gearing second.

UL

 

So i am going to go dyno my car again next week should i tell them to use 3rd or 4th gear. I have a Comptech SC so you be the judge of what the load time will be.

 

Damn, I'm stupid, but how the hell do you tell load time? I know "SMACK" Is that just the amount of time it takes for the dyno to spin to redline?

NMs2000, from what I gather it really doesn't make that much of a difference between 3rd or 4th gear runs. For example when I dynoed my car stock back in the first couple months of ownership my 3rd gear run was 1hp less then my 4th gear run. I don't have the dyno anymore as that was nearly 3 years ago.