qship5

So I got a chance to dyno my car today and was a little disappointed. It was done on a Dyno Dynamics dyno which I understand from previous experience is probably the most conservative dyno out there. I dynoed 399 hp and 390 lb-ft tq at the wheels. I was expecting more like 430 -440 hp. I've got the Renntech stage 2 ECU tune and the CF intake from MHP. I know dyno numbers are just that...numbers, but what do you guys think?

BTW I did edge out a CLK black series that was there. (It's stock) The HP numbers were very close between the cars, although his 3rd run fell of by about 15 HP, but I showed about more 15 lb-ft tq and the peak arrived about 800 rpms earlier.

Qship

DFW01E55

Look at it this way, all the BMW guys who were watching were envious of your torque! And the sound was great!

I think you're right where you should be, here's a bunch of 63 dynos.

The exhaust manifold my be the restriction now.

In the end, the numbers probably mean low 12's at the strip .... DR's and headers, who knows?

qship5

Yes, the torque from our motors is what gives us the edge in the real world, on the street. It was good to have more than one AMG at the meet and dyno today!

DFW01E55

I just posted my sheet from today into that referenced thread.
Despite being a bit short on torque compared to yours, I've never thought it was short on power. If it was 20 degrees cooler, our numbers would be much more attractive.

mrtesting

is that in hp or whp? I thought most dynos counted the power at the wheel, rather than as a whole..? in which case, 399whp is well into 460bhp zone..

mthis

do you have a sheet they gave you to show us. and are they corrected number or non? 4th gear 5th gear ?

bfnnrgn

Dyno day

DFW01E55

Yeah, the king was missing.
What's the update? Did they start your car?

bfnnrgn

No. They were supposed to last Tuesday. However they didn't have the oil dipstick...of all the things...and they won't get one until this Tuesday.

qship5

The numbers are wheel horsepower and from prior experience with this dyno and lots of cars that have run on it, the whp numbers tend to be at least 20% below the numbers at the crank.

qship5

I agree our numbers could easily be improved on a cooler day and if there was better airflow in the dyno area. The fans there just don't create enough airflow to simulate the car moving at speed. As far as the torque is concerned, I think both our cars are certainly very fast and I found it more interesting that the torque curves looked similar, except that mine reached the peak sooner. Perhaps that is the result of the Renntech ecu tune.

Overall I think we probably posted some of the higher numbers for the day. That is until Mark's GT got on the dyno and posted 677 rwhp.

qship5

BTW, never meant to imply you were down on power, just looking for what I got for my money on the mods. I would expect a modded 63 engine to make more power than a stock one, but that wasn't really the case between yours and mine on rwhp, but the tq did seem to show an edge to the ECU tuned motor.

qship5

Here's the dyno sheet. I think it was done in 4th gear and I don't know if it was corrected.

FishtailnZ

DD dyno's are called "The Heartbreaker" for a reason *L*. But it's just a number, and yes they do read lower than the more common Dynojets. My ex SLK55 only put down 260ish rwhp on a DD machine, when other SLK55's show at right around 300 on a Dynojet. But mine still ran 12.7 at 110 to 111 traps at the track so it wasn't down on power for sure - just in dyno sheet comparisons *L*.

DFW01E55

I understood.
Your torque comes on more quickly and goes higher ... the benefit of the tune.
Both cars suffer a slowdown in the curve from 2900 to 3300 rpms. Must be a load limiter in the software. It doesn't happen to all 63's, but it shows up to some degree in a lot of the dynos.

Bigbob

With just the ECU 2 tune you should have had about 410 HP and 388 tq to wheels. You might want to put your stock air box back and see if there is any difference. We use a dyno jet dyno and usually look for about a 20% loss in the drive train.

hooleyboy

Ive seen about 10 C63's on a dyno dynamics bone stock and after ecu tuning I've been on a dyno dynamics and had over 100 pulls. Bone stock C63 puts down around 330ish whp. New M3's on dyno dynamics bone stock but down about 315whp and like 250wtq. Your car is right were it needs to be.

mthis

17.5% not 20% thats are drive train loss and 5th is the gear not 4th. the dyno you did is still good but with that u have you should be higher. yes i understand that dyno dynamic shows lower numbers. thats y no one uses it. good luck. stay safe.

mthis

330ish stock thats low. my car stock on a DYNO JET made 375whp which my 17.5% is 455hp give or take a few. hows that making 330 and saying thats accurate. 330whp = 400hp to crank.

can you guys expaling to me and plese someone prove me wrong. thanks

hooleyboy

Dyno dynamics read about 11% less than dyno jets. I had a dyno jet run not to long ago and put down 389whp thats just about in line with 11%. How these numbers are calculated is beyond my ability Truth of the matter is Dyno Dynamics dyno are just about the best dyno made. people get upset with lower than expected numbers but it more of a true HP number.
Dyno Dynamics= heartbrake dyno.
Dyno-jet=ego dyno
I had my heart broken on a Dyno Dynamics many of times and it sucks, so for a morale boost I did a pull on a dyno-jet.
IF you want higher numbers on a dyno run race fuel 100oct. Its good for about 15whp more. IF you want other numbers try a Mustang or a MAHA dyno.

jturkel

+1 100%

hooleyboy

Stick with one dyno its the best way to go. I use dyno dynamics but it might not be for everyone. If a dyno jet closer for you use that. just stick with the same dyno when doing mods.

qship5

There was a local club member there that owns an E92 M3 and he mentioned that his car only showed 300 rwhp on this dyno in stock form.

jturkel

not surprised about that M3's whp.....apparently they also only dyno 270-280 wtq......sad IMO

Martin in Australia

Oops, wrong thread!