09-23-2012, 09:37 AM | #1 |
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Dyno Day
Attended a dyno day yesterday with a few of my buddies. I'm running a stock tune, but with a maddad midpipe and remus axle back. These are 5th gear pulls. My buddy with a 2002 E46 M3 w/ euro headers ran 288 whp/242 tq and another buddy with an E92 M3 ran 343 whp/255 tq. I'm not sure how to dissect dyno numbers, but enjoy.
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09-23-2012, 01:10 PM | #2 |
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Those are obviously at the wheel numbers and seem pretty high for a mostly stock car with just 2/3 of the exhaust is modded. I know that dynojet numbers read much higher than Mustang dynos. My recent dyno run on a Mustang dyno (car 100 % stock) just before the install of Evolve Race exhaust with N55 mids ended up with almost identical numbers with what GIAC reported in the past for their stock 1M: max. 294.2 hp and 342.9 lb.-ft of torque which (if I follow what my dyno operator and others suggest) should interpret like a minimum 353 hp (or 358 ps) and 411.5 lb.ft (or 558 nm) crank. I was told to multiply the atw numbers by 1.2 to reach calculated crank numbers for a well calibrated Mustang dyno. And since I matched exactly the same of GIAC test I kind of feel safe about the dyno that I used.
Either way, there is no denying that BMW claims of 340 ps and 450 (+50) nm are somehow underrated, especially the torque figure. 1M is closer to 360 ps and 560 nm and sweet spot is anywhere between 2500 to 5000 rpm. Another note I observe, the hp does not fall very sharply like other stock N54 versions and stick pretty well till almost 6500 which is where you should consider changing the gear already anyway. I like the way that M engineers designed stock map. By the way, what was the fuel you were using at the time of dyno? Last edited by ozinaldo; 09-23-2012 at 01:17 PM.. |
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09-23-2012, 01:34 PM | #3 |
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It was either 91 or 93...can't recall.
As far as dynos go, not all dynos are created equal. Dynojets do read higher than mustangs, but I wasn't posting my numbers to flex my love member. It was more for the video and sound, but then I figured folks would ask for the printout.
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09-23-2012, 01:51 PM | #4 | |
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09-23-2012, 02:18 PM | #5 |
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HP is consistent with other 1M Dynojet runs with midpipes. Exhaust doesn't contribute unless it's a straight thru like the Meistershaft. Power is falling off at 5k which is at the lower end (5k - 5.5k rpm). It would be easier viewed if a smoothing factor was used. Max torque is at the higher end of the spectrum.
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09-23-2012, 07:49 PM | #6 |
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Interesting that it measured only 19 hp short of the e92 M3.
How did you get past the speed limiter to top out 5th gear? |
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09-23-2012, 09:46 PM | #7 |
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I have no idea. I was surprised to see speeds that high in 5th, too.
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09-23-2012, 10:45 PM | #8 |
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I have wittnessed 270 km/h in 5th on the road and it was still going when I stepped back. I doubt that my car has a top speed limiter other than its drag coefficient! Euro spec. car and stock everything at the time I did that. And I am surprised that you found a dyno shop which actually made a 5th gear run. My shop here refused even the idea of it as a principal. 1/1 ratio, kind of ideal isn't it? Can it explain slightly high numbers?
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09-23-2012, 11:27 PM | #9 |
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Mine is not a euro spec, if that matters any. I heard/read 5th gear is closest to 1/1 ratio, so it's best to do pulls in 5th. Who knows and really, who cares? The link below disputes the theory. So, to answer your question....no. I, too, have heard of shops that don't like the high speeds on their dyno. Not sure why? Safety?
Check out the link below....pretty good discussion. http://forums.nasioc.com/forums/show....php?t=1478091
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09-24-2012, 08:49 AM | #10 | |
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
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10-04-2012, 12:05 PM | #11 |
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Your results are pretty much consistent with mine (and other 1///Ms). Fully stock on a Dynojet I was at 315whp/355tq. The MadDad midpipe and Akra slip on added 10 to both figures, which is right where your power figures are and your car seems to be making even more tq.
But as has been stated, it is the delta that really matters (relative to say the M3, or to what you were pushing stock, all on the same dyno).
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10-07-2012, 10:37 PM | #12 | |
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12-08-2012, 05:08 AM | #13 |
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Smoke billowing during dyno of a Belgian 1M. Dyno was aborted. Owner initially thought there was an engine issue. It appeared to be an unintentional burnout. To avoid another burnout two men took place in the backseats and the dyno was resumed (tune: 418hp - 660Nm).
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12-08-2012, 09:42 AM | #14 | |
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EDIT: Tq difference between stock 1M to stock E9X M3 is huge, literally around 50 to 60 % difference there. However, M3 really has one of the flatest curves I've ever seen.
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake. |
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12-08-2012, 10:16 PM | #15 |
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Nice pull, roughly as expected. It's another data point that confirms the 1M is usually making ~20-30 hp less than the M3. Lots of dynos suggest this, and that's before any turning.
http://www.1addicts.com/forums/showp...6&postcount=52
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