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      01-23-2009, 05:36 PM   #1
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Stock E90 M3 Dyno Results

I took a baseline dyno today with a DynoJet and the numbers looked pretty solid from what I see. I am doing a bunch of bolt-on's and software next week so we will get a 'before' and 'after' comparison. Enjoy.
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      01-23-2009, 07:40 PM   #2
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Nice. Thanks for sharing. 350 at the wheels looks good. Let us know the mods and I'll be watching for a follow up on the dynos.
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      01-23-2009, 09:21 PM   #3
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Very nice, Keep us posted on the bolt-on results
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      01-23-2009, 09:38 PM   #4
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man gotta love that torque curve
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      01-23-2009, 09:46 PM   #5
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Thanks very much!
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      01-23-2009, 10:06 PM   #6
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Niice run!! I got 343/252 but it was in high humidity and I think it was 97 degrees.
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      01-23-2009, 10:23 PM   #7
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great results & thanks for sharing. please get back to us with the ney dyno results after modding. what software will you use?
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      01-23-2009, 10:26 PM   #8
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What octane gas?
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      01-25-2009, 07:32 PM   #9
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Quote:
Originally Posted by arr0gant View Post
Niice run!! I got 343/252 but it was in high humidity and I think it was 97 degrees.
Best stock dyno plot I have seen. It has everything I like to see on a plot including A/F ratio. It is SAE corrected so none of that mattered. You can see the correction factor was .97 so if it was uncorrected he would have made more HP. Since he is in NC I am sure he is on 93 octane.
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      01-25-2009, 07:56 PM   #10
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Quote:
Originally Posted by King Tut View Post
Best stock dyno plot I have seen. It has everything I like to see on a plot including A/F ratio. It is SAE corrected so none of that mattered. You can see the correction factor was .97 so if it was uncorrected he would have made more HP. Since he is in NC I am sure he is on 93 octane.
Gotcha. I wonder how much difference it was 91 octane vs. 93 octane...
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      01-25-2009, 07:58 PM   #11
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I've come to the conclusion that it makes a big difference 91 to 93 octane and we know that more than 93 octane can probably make more power as well.
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      01-25-2009, 08:21 PM   #12
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I'm pissed. I can't find my Dynojet page. It had all that info as well. I can only find the pic I took of it and I idioticly missed that sae info, temp etc... Still I think 343/252 is good on 91 octane!!
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      01-25-2009, 09:11 PM   #13
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so it seems after 7K RPM, additional hp marginal....

The torque looks great / flat....the HP curve at 7k is almost near the max hp.....so pushing the engine past 7k RPMs up to 8k+ appears to only produce a few extra hps....
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      01-25-2009, 09:22 PM   #14
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Quote:
Originally Posted by King Tut View Post
I've come to the conclusion that it makes a big difference 91 to 93 octane and we know that more than 93 octane can probably make more power as well.
About a 20whp...
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      01-25-2009, 09:59 PM   #15
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My 94 octane should be nice then!
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      01-26-2009, 04:03 AM   #16
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cool power..350 on wheels..thats very good.
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      01-26-2009, 06:12 AM   #17
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Thanks for the plot.....and congrats on the good numbers. I was getting a lil scared with all these 330whp dyno's showing up.
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      01-26-2009, 06:40 AM   #18
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Very nice numbers the trq looks great, so how are some seeing 350-370 range
Than again I could be quoting vendor numbers


Does anyone have a good E46 M3 dyno sheet on hand for comparo. I guess where the glory lies is in the Trq band as they're similar there, but the E9x engine doesn't dip until the end of the rev range
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      01-26-2009, 08:25 AM   #19
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I want to have my M3 dynoed soon. Any recommendations as to which dyno I should be looking for to get as preceise results as possible? Any issues I should keep in mind / ask?
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      01-26-2009, 12:25 PM   #20
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Quote:
Originally Posted by PencilGeek View Post
Well, if you're looking for accurate results, I wouldn't use a roller dyno -- as they basically guess at horsepower based on the physics formula: F=M*A (Force = Mass * Acceleration). So they basically look at how fast you accelerate and the mass of the car, and basically guess -- or infer -- how much horsepower you've got. Once you throw in the inertial effects of the wheels, traction to the rollers, load put on the car by the straps, and the fact that I'll bet NOBODY actually weighs their car before the dyno -- you basically end up with useless results (with respect to accuracy).

So if you're looking for accuracy, the only choice you've got (short of pulling your motor out and putting it on a motor dyno), is to use a dyno that attaches directly to your hubs, places a hydraulic load on the motor, and measures torque exactly like a motor dyno does. Basically, you need a Dynapack or Rototest. I don't know which will be easier to find in Greece.

Now that I've said this, I predict the next 20 posts will be from people who swear by roller dynos, and will come up with all kinds of convoluted reasons why they're "good enough." Since you said you want accuracy, there's very little they can offer to give you what you want.

Click on my "Dyno Runs" link in my signature for a complete description and list of many tests I've already run on the M3.
HI PC, would you know a Dynometter that uses Dynapack here in Georgia?

Thanks,

Eric
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      01-26-2009, 12:30 PM   #21
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Hey PencilGeek, what should the horsepower and torque of the car acurately be (stock) when dynoed with a Dynapack?
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      01-26-2009, 12:32 PM   #22
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Alright. I'll be the first.

Roller dynos don't guess or estimate, they calculate torque and HP exactly based on the mass of the roller (not the car) and the energy necessary to accellerate the roller. Where the problem lies is translating that back to the engine. Just the same as the dynapack, they have to work in correction factors for STP. Then some bozo pulls a number out of his a$$ for gear losses, same as the dynapack.

The uncorrected numbers from the dynapack should not be significantly different from the uncorrected numbers from most any decent roller dyno with the exception of wheel slippage which is not a problem for the majority of cars.

I would expect the dynapack to be more repeatable, however, which is what you really need to compare before and after mods. But you didn't say that. We need to differenciate between accuracy and repeatability in these discussions. The Dynapack is no more accurate than the guesses that go into the correction factors, just like an inertial dyno.
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