Sinister Subaru

Awesome car, but making 650 hp at the fly, and then only 46x at the wheels would **** me off, even though I understand the parasitic loss caused by AWD.

With 650 hp I'd be pretty pissed if I didn't crack into the 10s in an AWD car.

Most definitely an awesome STi though. I'd be happy to have it sitting in my driveway!

thunder_sti

iTrader: (5)

Sweet clips,,,

SubyN00by

iTrader: (15)

You must not be familiar with the Gruppe-S heartbreaker dyno...

Sinister Subaru

Ummmm, can't say that I am. Care to explain?

SubyN00by

iTrader: (15)

that freakin dyno breaks hearts up and down the block...people see anywhere from 25-100hp difference from other dynos. (= It's pretty funny...

Sinister Subaru

Yikes! Somebody needs to get their dyno calibrated!

thunder_sti

iTrader: (5)

^^^^I agree ^^^^

Sinister Subaru

A "heartbreaker dyno" could be construed as a positive thing (I guess.....) but when I'm paying hard-earned money I want something that's as accurate as possible. Granted, ALL dyno readouts are going to vary depending on which shop you use (even with the same model dyno), as there are many variables that come into play, but when there's one dyno reading 100 hp more/less than another, that's a problem.

Obviously an STi motor belting out 650 hp cost some serious coin, and when spending that much money, I just want the most reliable information. It's one thing to dyno with your new catback exhaust, but it's another thing to dyno with a motor you just dumped $15,000 (probably more) into.

mudman

From what I've seen on these boards, the Gruppe-s dyno, DBTuned dyno and EQ's road dyno software all seem to read about the same within a few horses.

Stock STi numbers are a good barometer.

SubyN00by

iTrader: (15)

Sinister, Mike has his dyno setup for tuning, not to readout the highest numbers possible. Also, different types of dynos will read different, (ie dynapack, dynojet, mustang, etc). People know that Gruppe-S numbers are in a league of their own.

gruppe-s

iTrader: (22)

Maybe some other shops need to have their dyno's calibrated... Don't you think it's a bit fishy that some dynos are producing WHP numbers that are higher than the turbo (on the car) is rated for at the crank? If you look at the trap speeds on the cars we have tuned, the theoretical ACTUAL WHP is well in line with what these cars are making on our dyno. The key thing is to look at the delta between what the car made stock and what it makes now. A stock 04 STi makes about 220 WHP on our dyno.

Our dyno is set up to give our customers the best possible tunes; not to inflate their egos with false or meaningless dyno numbers. A car will make the same power regardless of what dyno it was measured on. That being said, I understand where you're coming from. It'd be wonderful if we could have some sort of universal consistancy between dyno numbers but alas, only in a perfect world.

Thanks,

Geoff

RedStage

iTrader: (4)

Accuracy > Fake #'s

Sinister Subaru

True. What type of dyno is it? I hear that Dynopak reads the lowest, and then the Mustang dyno does.

As for the highest numbers, I personally wouldn't be looking for the highest numbers, but realistic ones. I'd personally rather have a conservative reading, but not tons of hp too conservative.

Everyone (that knows anything) knows that dynos are nothing more than tuning tools, but it's still nice to see some accuracy. No, you can't use a dyno and say, "Hey, this car will run 10s," but you should be able to use one and say, "The 10s should be feasible with this car, judging from the power it's making." People make the mistake of "dyno racing," when in fact the most accurate way to tell what type of power a car is making is to take it to the track.

gruppe-s

iTrader: (22)

It's a Mustang 4WD Dyno but even different Mustangs read differently depending on their calibration. Dynopacks read the highest. Part of the reason is because the dyno connects directly to the car's hubs, bypassing the rotational mass and frictional loss created by the wheels and tires.

Again, the numbers don't really have anything to do with being conservative or optimistic; the car will make the same power regardless of what that numbers say. It just depends on how you measure WHP. For instance, the standard for measuring 1 WHP on a Dynojet is an F150 pick-up IIRC.

Dynos actually weren't originally designed as tuning tools and many of them still aren't used as tuning tools. Loading dynos like Mustangs, Dyno Dynamics, and Dynopacks are designed for tuning but Dynojets (which aren't loading) are not. They're designed to measure a cars output as compared to another car. This would be useful for Spec race cars or for people who simply want to know how much power a certain modification added to their vehicle.

-Geoff

Sinister Subaru

D'oh! That's right, the Dynopack is the highest rated! My big mistake!

Thanks for the tips, Geoff. I would most definitely want my car dynoed with the wheels ON my car, because after all, I drive with wheels ON my car.