10-12-2015, 11:55 AM | #1 |
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Dyno numbers - Stage 2 Dinan + M Performance Exhaust
Had my car dyno'd to see what she put to the wheel...
What do you think?? WHP: 567 hp Torque: 532 lb-ft
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Last edited by kris1858; 10-20-2015 at 09:25 PM.. |
10-12-2015, 07:05 PM | #2 | |
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10-16-2015, 09:04 AM | #3 |
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How much did it put down before?
You could simply gain more power with a flash tune, but no doubt, nice reliable power. |
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10-16-2015, 09:23 AM | #4 |
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I haven't dyno'd my car yet (in the plans for this Fall), but the Turner dyno sheet for their tuning module shows 585 HP/525 ft-lbs. So little more HP, but little less TQ. Every dyno is different, and I figure the Turner module might be a little more aggressive than the Dinan (since they don't have the warranty to worry about). So yeah, I'd say that seems right. Assuming 15% drivetrain loss, that has you at ~670 HP at the crank, which isn't too shabby
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10-16-2015, 09:55 AM | #5 | |
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10-16-2015, 10:44 AM | #6 |
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Considering 12-15% drivetrain loss, Crank power would be 644-667 HP and Crank TQ would be 606-628 lb-ft ...
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10-16-2015, 11:35 AM | #7 |
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C5driver - will do! The butt-dyno is impressed, and various methods of comparison (my favorite on-ramp, comparing speeds at various points on the track using the M Lap Timer app from before and after the module, etc... ) show noticeable increase in acceleration (once going fast enough to put the power down) (5-10 MPH faster). But my plan is to get up to Granite Dyno this Fall and get some real numbers. Will post here when I do!
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10-16-2015, 10:51 PM | #8 |
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Oh I see, thanks for doing the math. I just took a guess on the top of my head. Good numbers for the crank
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10-21-2015, 02:31 AM | #10 |
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How do you convert whp to crank? any formula? Thanks
-Noob regarding dynos.
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10-21-2015, 07:18 AM | #11 |
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Basically you just need to calculate drivetrain losses, which vary between types of drivetrains. I've always heard that BMW RWD has roughly a 15% loss.
CHP - (CHP * 0.15)= WHP CHP * 0.85 = WHP CHP = WHP/0.85 |
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10-21-2015, 04:31 PM | #12 | |
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For RWD you can consider 12% and for AWD you can consider 15%
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10-21-2015, 06:49 PM | #13 |
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M6-Coupe - not that I'm doubting you, but do you have any sources for that?
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10-21-2015, 08:41 PM | #14 | |
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You can read this article: http://www.torquenews.com/106/2013-b...wer-advertised
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10-21-2015, 09:18 PM | #15 |
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Interesting. This article - http://www.automobilemag.com/feature...rs4_dyno_test/ talks about 20% loss for AWD. I know RWD has more loss than FWD, so 15% makes some sense to me, but yeah it does mean the crank HP is pretty high. I could just be being optimistic hoping to have more power than I do though
I just found this - http://www.***********.com/showthrea...ion)-vs-Manual which seems to state clearly that DCT has MORE loss than manual. Performance and fuel economy being gained by quicker shifts and higher gear ratios. I dunno. |
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10-29-2015, 08:31 PM | #16 |
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one major flaw i find with drivetrain loss is the fact that we use a %. If each component robs X amount of hp, which is basically the power it takes to turn or move that component. Using a % infers that this loss would increase as power increases and that its not the case. If the car has a loss of about 75hp when it is stock and you then get a tune that adds 100bhp by using the same % you are saying the loss is now more than 75hp. Why would the amount of power needed to move the components increase just because the power increased?
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10-30-2015, 12:07 AM | #17 |
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Well some of the loss points DO change based on how much power/torque is pushed through them, (added heat, more stresses, etc...). Actual losses will vary based on RPM, drivetrain load, component temperatures, etc... so it's really a ballpark range anyhow.
FWIW I've found several sources that show automatics typically show 2-5% higher loss than manuals, and RWD loss range from 10-18%. |
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