I doubt I'm the first person to suggest this, but I think it would be worthwhile if the Evo tuning community could make a concerted effort to establish some consistency in dyno numbers - within reason of course. I think it would really be an asset for the whole community if you could drive a 91 octane stock Evo IX down from one site vendor's Mustang dyno to another site vendor's Dynodynamics dyno and put down similar numbers...give or take 10whp/10wtq. There's no way to make anybody do anything and the vendors would have to come together on this, but it would really simplify the communication process among tuners and modders from coast to coast. Just my 2 cents. The SAE standards are only as good as the initial numbers they're correcting. As long as I've been into cars, regardless of make or model, dyno numbers have been all over the radar from shop to shop. It would be nice if this community, starting with the site vendors, could take a step forward.

 

You can't make them consistent that way. You just have to get multiple samples from each dyno and compare them with trap speeds. Not all dynos of the same type read the same, so you just have to use statistical analysis to get a bearing on each individual dyno and how it reads relative to others.

 

It would no doubt be a challenge, but I think the first step would be to establish a baseline range for all STOCK Evos based on model year. Instead of worrying about trap speeds as they relate to modified Evos just have each shop calibrate the dyno specific to a stock Evo. For example, make it 235whp for a stock IX, 225whp for a stock '05 VIII, and 215whp for previous models. Any increases in power as a result of tuning and/or modifications would be relative. It wouldn't be perfect but it would be much better than the current situation.

 

You can't randomly calibrate a dyno to read differently. Each dyno is different and behaves differently. Some can be changed to read MORE LIKE others, but that doesn't mean they all can change in such a manner. Even if they do change, just because they would read the same on the same stock Evo, it doesn't mean they'd read the same when that Evo was modded.

Then, you have more than 5 different AWD dyno types spread all over the country with different altitudes, climates, roller weights, settings, etc etc. Just taking one car to several in the same area would do nothing for the ones in other parts of the country. One extreme example, but valid nonetheless, is where I live at 6800'. The power is drastically different at this altitude. Not only that, but the power CURVE is drastically different in addition to the loss of power. Most places aren't this high up, but there are people who live at sea level, 1000', 2000', 3000', etc etc, and others who live where it's 100* at night (AZ) or 40* during the day (Boise?) with all combinations of elevation for that, too.

It's just not feasible. People already know what stock Evos do on individual dynos, and we use those numbers to better understand what a modded Evo on that same dyno has gained. We then also use trap speeds to verify those numbers against other dyno numbers from other areas.

 

I didn't know that. It was my understanding that a dyno can be manipulated, with vehicle weight for example, to read higher or lower on the same car.

 

Some can and some can't. They all have different software that does different things.

 

Up here in NorCal for example, almost every major shop puts down comparable numbers for comparably equipped Evos. It could have been coincidental I guess, but I doubt it. I can go to Vishnu's Dynojet, Gruppe-S's Mustang, EIP's Mustang and Speed Elements Dynodynamics and see no more than a 10-15whp variation in my numbers. I don't which one was set up first, but I think the local tuners prefer the consistentcy to at least measure themselves from time to time. I'm sure they also talk amongst one another occasionally too.

 

well..

i think its stil lnot apples to apples even if they are calibrated the same, as load varies on the dynos, parasitic loss etc...

and i dont think any tuner/dyno shop, is going to recalibrate their setup for one make of car....

cb

 

A lot of these Evo tuners with AWD dynos specialize in only Evos and WRX's. I don't think standardizing the numbers, at least on a regional level, would be a huge undertaking. I think it would be cool to see somebody post some numbers and not have to ask for a frame of reference. As it is right now it's a guessing game.

 

Vishnu has a dyno dynamics, so it makes sense that those dynos are all close. They are all low-reading dynos - that happens anywhere with similar dynos. They didn't do anything to make them read close to each other.

Also, you said those shops are mostly Evo and Subie. Well, calibrating for one car would not hold true for the other car.