RETed

I believe the two DynoJet were about 2-3 hours away, and runs were made on the same day.
I *think* the CF's were almost identical.
Yet, the dyno runs were 8hp difference on a 200hp run.
That's pretty bad.


-Ted

rx7tt95

If you're getting wheelspin on a Clayton (twin roller), the car isn't strapped down properly. I've been using a Clayton here locally for about 3 years with no wheel slippage issues. The Clayton read, on average, about 3hp less than the local dynojet. I used to go back and forth testing between the two. The downside to the Clayton is that company support is virtually non-existent and they can be troublesome to keep calibrated which makes them useless for tuning (different calibrations lead to different hp numbers, ie. no reference point). But they do offer inertia and resistance-style runs and can therefore do everything a dynojet can do. The local Clayton even has a five gas analyzer. If it were consistent, and I had the money, I'd go with the Clayton. Then again, I've seen many dynojets that weren't properly maintained/calibrated as well

adictd2b00st

i was on precisions site and noticed theres a bunch of options for the pt61.... if u don't mind me asking what are the specs on yours? i'd like to call them today and see if they have any available, looks like this will be the turbo i end up going with, thanks

Zero R

iTrader: (1)

Just so your aware Dynojet makes a eddy current dyno.

enzo250

yeah there jumping on the bandwagon but there still using heavy interia rollers

Zero R

iTrader: (1)

I'm of the opinion that if you go where they care about their equipment and quality of work and use that same equipment for all you tuning needs you should be fine regardless of the numbers.

Kahren

iTrader: (13)

the SAE correction should be the same on pretty much all dynojets. so say you dyno one car at one dynojet then dyno at a diffrent elevation u should get the exact same number as teh first one. now if you turn off the SAE correction then the runs will have diffrent power and obviosuly it would. the diffrence in power is even more so if the car is making a lot of power since its the % that changes and not a hp amount. ive VERY consitent results with all the dynojets i have been to throughout a few states around me with the same car. the only time the numbers will be off if the car is INCONSITENT!!!! and that happens more often then peopel think. thats why i alwasy say DONT "GHETTO" the mods you install

Gorilla RE

iTrader: (1)

wargasm''((I agree, a Mustang-type dyno is better for tuning. A Dynojet is better for getting "real numbers" - because that's what about 90% of RX-7s are dynoed on.))''
ummm... a mustang dyno is better for tuning and REAL HP numbers. a dynojet is only guess'n at the RWHP, so what if 90% of RX-7s use them it doesnt mean their right.

Wargasm

A "real" number is something useful for a comparison.

If I come out with the Wargasm-5000 Dyno and declare that my car has 9,883.01 HP as measured by my dyno... great... does that tell anyone anything useful? No.

If 500 other people use my dyno and all get numbers from it.. now you've got something useful.

Because most RX-7 dynos I have seen (probably 95% or more) use the Dynojet number, that is what is useful. Whether or not a Mustang or Dynojet comes closer to the true hp is irrelevant.