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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > 335D got dynoed today



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      04-13-2007, 12:05 PM   #1
peppernick
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335D got dynoed today

With the pending re-map, I thought I'll get before and after dyno readings for comparison.

Charlie at Surrey Rolling Road did a few runs with my car today.





The readings were pretty consistent. Because the car is an auto, only rear wheel BHP can be measured.





I would have thought the difference between crank and rear wheel BHP is around 25%. So with those figures, we are looking at 278BHP at the crank, whcih is 8BHP down from the manufacturer's quote of 286BHP.

Torque is at 335ft/lb. Again given the 25% difference, we are looking at 420ft/lb, 19ft/lb down from the manufacturer's quote of 439ft/lb.

However, the engine has only done 2500 miles.



This is the power curve printed on the brochure.





It'll be interesting to see what the new readings are next weekend at the dyno meet (at www.surreyrollingroad.co.uk) after the re-map on Monday.


Here is a video of the run. As you can see, the 335D is so silent that the engine and exhaust noise is completely overidden by the cooling fan noise.

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      04-13-2007, 02:59 PM   #2
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Just wanted to say I saw the previous pics of your car also and it looks awesome...you have dome some good work there!
But is the 335d really that much better than the outgoing M3??
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      04-13-2007, 03:54 PM   #3
peppernick
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Quote:
Originally Posted by 2GPP View Post
But is the 335d really that much better than the outgoing M3??
One is no better than the other. They are very different. Desirability depends on what you want from the car. Still, both very good cars.
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      04-13-2007, 05:23 PM   #4
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Quote:
Originally Posted by peppernick View Post
I would have thought the difference between crank and rear wheel BHP is around 25%. So with those figures, we are looking at 278BHP at the crank, whcih is 8BHP down from the manufacturer's quote of 286BHP.

Torque is at 335ft/lb. Again given the 25% difference, we are looking at 420ft/lb, 19ft/lb down from the manufacturer's quote of 439ft/lb.

However, the engine has only done 2500 miles.
You would expect 15% to 25% loss between the crank and the rear wheel. That said, 25% loss would be 296BHP (222.3BHP/75%) and 447ft/lb (335ft/lb/75%) at the crank and not 278 BHP and 420ft/lb.
If we assume your car is actually achieving 282BHP at the crank (although BMW quote 286BHP, that’s actually 286PS), then the driveline is “adsorbing” 23%; not to bad for an automatic, although I would have hoped BMW’s drivetrain would be more efficient, say 20% to 21% loss, which means you’re about 2% down on BHP etc, something I would put down to your low mileage.
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      04-13-2007, 05:57 PM   #5
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I'm always reading that BMW figures are generally quite modest, a bit disapointing to hear yours isn't quite on target

when are you getting remapped? mine is next week
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      04-13-2007, 07:49 PM   #6
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Quote:
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when are you getting remapped?
Next Monday 12.30pm :rocks:

I'm more interested to see the difference in 1/4 mile times and terminal speed at that. So it's Santa Pod time once again
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      04-14-2007, 03:32 AM   #7
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Quote:
Originally Posted by Art Man View Post
You would expect 15% to 25% loss between the crank and the rear wheel. That said, 25% loss would be 296BHP (222.3BHP/75%) and 447ft/lb (335ft/lb/75%) at the crank and not 278 BHP and 420ft/lb.
If we assume your car is actually achieving 282BHP at the crank (although BMW quote 286BHP, that’s actually 286PS), then the driveline is “adsorbing” 23%; not to bad for an automatic, although I would have hoped BMW’s drivetrain would be more efficient, say 20% to 21% loss, which means you’re about 2% down on BHP etc, something I would put down to your low mileage.

thought the bmw figure was at the flywheel not the crank or the two figures identical????

25% sounds a bit much for a 2wd car would have thought much less 4wd usually loses that much


peppernick~: do you think you could have got into the 13's with the car in stock trim considering you were so close?

thanks

carl
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      04-14-2007, 05:02 AM   #8
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AFAIK crank HP = flywheel HP

Maybe 13.8 with more practice. Honestly, the 14 was what I thought a pretty good run. With a remap, low 13s any time I would guess.
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      04-14-2007, 07:45 AM   #9
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well i might be going to the pod this weekend coming, undecided as of yet.

i managed to get a 16.6 out of a 318is before so i would say im quite a good 'launcher' so you think i might if im lucky and its a cool day get a high 13??

what was the air temp when you had your run nick??

now ive said this ill prob struggle to get into the 14's


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      04-14-2007, 07:55 AM   #10
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Quote:
Originally Posted by dxb335d View Post
thought the bmw figure was at the flywheel not the crank or the two figures identical????

25% sounds a bit much for a 2wd car would have thought much less 4wd usually loses that much
In this case crank = flywheel.

15% to 25% loss is for two-wheel drive. I would expect manuals to be nearer the 15% and automatics nearer to 25%. Can’t really comment on 4x4, not having any experience with them.
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      04-14-2007, 11:13 AM   #11
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Why are autos a higher % loss?
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      04-14-2007, 02:44 PM   #12
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Quote:
Originally Posted by dxb335d View Post
Why are autos a higher % loss?
the torque converter sucks the life out of it (even in full lock-up) mode
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      04-14-2007, 03:34 PM   #13
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the torque converter sucks the life out of it (even in full lock-up) mode
Couldn't put it better myself
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      04-16-2007, 03:37 PM   #14
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The 335i has consistently put out 270-280HP to the rear wheels with auto trans. Your numbers sounds really low for a car that is suppose to make 286hp.
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      04-16-2007, 03:57 PM   #15
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Quote:
Originally Posted by Insider View Post
The 335i has consistently put out 270-280HP to the rear wheels with auto trans. Your numbers sounds really low for a car that is suppose to make 286hp.
I've had race cars of mine on different dynos in the past and they've never made the same power.

You really need a 335i on that same dyno (and ideally the same atmosheric conditions) to make a fair comparison.

Regards

Chris
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      04-16-2007, 05:23 PM   #16
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peppernicks e92 got remapped today (i know cuz i speak to simon at e-maps who's gonna do mine...) - he said the car went to somewhere between 350 and 360BHP and about 720Nm of torquey goodness

can't wait to get mine done, those are some almighty figures

i'm sure the man of the moment will be on here soon enough to tell us all how good it is
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      04-16-2007, 05:46 PM   #17
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peppernicks e92 got remapped today ....

i'm sure the man of the moment will be on here soon enough to tell us all how good it is
Nip over to EvoTechnik and you'll see he seems pleased
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      04-17-2007, 02:55 AM   #18
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All done! The best mod so far for my 335D. She's a different car altogether!

:rocks: :rocks: http://www.e90post.com/forums/showthread.php?t=56727 :rocks: :rocks:
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      04-17-2007, 03:57 AM   #19
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Can't DMS do it without all the guinea pig and freezer bit ?
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      04-17-2007, 02:47 PM   #20
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