Horsepower figures; How close to manufacturers claim? |
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Peter Fenwick
Bavarian-Board Contributor Joined: 27-August-2003 Location: Lost somewhere in time... Status: Offline Points: 6484 |
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That's quite a claim! |
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Entering an age of Austerity and now driving a Focus Diesel.
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T.J.
Bavarian-Board Contributor Joined: 22-September-2003 Location: Cork, Ireland Status: Offline Points: 2332 |
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I think what they do is test on the wheel under power, then measure drivetrain losses with wheels turning but with no engine engaged, and extrapolate from there. I'm sure someone with more familiarity in the systems can tidy that explanation up a bit!! the E46 M3 has a sissy fit on a rolling road unless its a 4 wheel one with the front rollers matching the speed of the rears. Otherwise the engine management detects a speed diff between the front and the rear and restricts output somewhat. I've seen 2 E46s and same thing on both: run up to 320-odd bhp and then nowt more |
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gjoconnor92
Really Senior Member II The eyes have it Joined: 21-July-2003 Location: Kildare and Limerick, Ireland Status: Offline Points: 735 |
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http://www.dynamometer.fsnet.co.uk/power-losses-flywheel-BHP .htm From the site previously given explains how flywheel is derived from road wheel figures. Killian I am still enjoying that 127bhp you had measured on the 320 |
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Gerard O'Connor
1989 E30 320i for track day use 1972 2002 competition car project (delayed!!) Sheane Formula Vee My e-mail |
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gstonesE4620i
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i used the lads in ashford or rathnew with the mazda and it was one little horse down on the manufc rating. from 110hp to 109hp at the wheels. i did trust them but it was a strange feeling knowing that someone else is ragging your baby. trackdayperformance i think was the name. Edited by gstonesE4620i |
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what do you mean it was unexpected, you should have expected it!
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Andyboy
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A perfect 3.2 M3 Evo engine, running 100%
(compressions, valve clearances, plus, coils etc) on an ENGINE dyno and running on 100 octane fuel will always deliver 321 bhp. On an iffy rolling road with imperfect calibration and an imperfect M3 running on 95 RON in need of a good service will drop a good 20 bhp. This is where all that rubbish about how 'Evos never do 321 bhp' comes from. They most certainly do, but only when in perfect condition and using the right fuel. I've found that double Vanos engines deliver a lot more power than the single vanos ones - considering the exhaust vanos was supposedly for emissions it's a bit odd. Sohlman's Dad has a 528i which delivers well over the 193 bhp quoted - it's not far off the 231 bhp the 530i delivers. This is also a double vanos car so a pattern emerges. BMW, like all German manufacturers must accurately state horsepower readings or face a huge fine and a public dressing down from the ADAC. If a car is supposed to give 150 bhp, that means a minimum of 150 bhp. ADAC are contantly borrowing cars and doing power checks. |
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Andrew Rolland
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thanks TJ that explains it. Andrew |
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kbannon
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128bhp not 127! That 1 horse makes a huge difference when overtaking! |
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Current: 2009 E60 520d "Sport" tractor
Previous: 1989 E30 320i SE 1997 E39 523i 2003 E39 525i Sport Individual |
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T.J.
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It does when you're trying to swerve around it, Killian!
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UJM3
Really Senior Member I Joined: 07-July-2005 Location: Dublin Status: Offline Points: 383 |
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I had mine in westward too, 288.7 bhp with a K&N panel filter, so imo its accurate. Evo magazine has taken to RR the cars its tests and quotes the rr power alonside the quoted power iirc the tvr tuscan covertable was way off, as in less. |
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Daveco
Really Senior Member I Joined: 23-June-2006 Location: Dublin Status: Offline Points: 253 |
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Lads had my '04 325 tested on Friday in Xtreme Autos Waterford-Came in at 200.3bhp! This was in 4th gear at 115mph. Torque also came in at 183lb ft, 3 above what BMW say. The guy who did the test said if he ran it in fifth he could have got up to 204-5hp but I didn't want to push it. The 325 is running on standard fuel with no mods. Pretty chuffed!
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past-01 318ci auto, '01 318ci
present-'04 325ci sport future-no house and a 5 car garage |
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gjoconnor92
Really Senior Member II The eyes have it Joined: 21-July-2003 Location: Kildare and Limerick, Ireland Status: Offline Points: 735 |
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Don't forget that other way to increase efective horsepower Weight If a 1200kg car has 240bhp (5kg per bhp) throwing out your 80kg passenger is worth 16bph At the track days, some might have noticed people evicting spare wheels, tools etc. to improve power to weight ratio
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Gerard O'Connor
1989 E30 320i for track day use 1972 2002 competition car project (delayed!!) Sheane Formula Vee My e-mail |
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stephenperry
Bavarian-Board Contributor Joined: 20-April-2004 Location: Elgin Status: Offline Points: 7213 |
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very few cars will hit the rev-limiter in fifth, it depends if fifth is a direct top gear or an overdrive, if it's an overdrive then i don't think there would be no point in changing up since maximum power is achieved in fourth, if it's direct then he should have changed up |
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2007 Ford Mondeo 2.0 TDCI Titanium X Auto 1983 Ford Sierra XR4i 2000 Alpina B10 3.3 #118 1999 BMW 323Ci 1995 BMW 318i SE 1994 Vauxhall Omega 2.0 GLS 1995 Ford Mondeo 1.8 LX 1990 Honda Concerto 1.6 EX 1986 Ford Orion 1.6 GL 1989 Ford Fiesta 1.1 Firefly |
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stephenperry
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an impressive result, regardless
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2007 Ford Mondeo 2.0 TDCI Titanium X Auto 1983 Ford Sierra XR4i 2000 Alpina B10 3.3 #118 1999 BMW 323Ci 1995 BMW 318i SE 1994 Vauxhall Omega 2.0 GLS 1995 Ford Mondeo 1.8 LX 1990 Honda Concerto 1.6 EX 1986 Ford Orion 1.6 GL 1989 Ford Fiesta 1.1 Firefly |
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gjoconnor92
Really Senior Member II The eyes have it Joined: 21-July-2003 Location: Kildare and Limerick, Ireland Status: Offline Points: 735 |
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Hi Stephen On a road most cars will not hit max revs in fifth due to weight drag etc. These do not apply on a rolling road so an indicated speed higher than what could ever be got in real life should be possible. Maybe there is a limit to the maximum roller speed on rolling roads. Theoretically, should maximum power be measureable in all gears, or is this another limitation of rolling roads rather than the car |
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Gerard O'Connor
1989 E30 320i for track day use 1972 2002 competition car project (delayed!!) Sheane Formula Vee My e-mail |
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stephenperry
Bavarian-Board Contributor Joined: 20-April-2004 Location: Elgin Status: Offline Points: 7213 |
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I stand corrected, thanks Gerard |
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2007 Ford Mondeo 2.0 TDCI Titanium X Auto 1983 Ford Sierra XR4i 2000 Alpina B10 3.3 #118 1999 BMW 323Ci 1995 BMW 318i SE 1994 Vauxhall Omega 2.0 GLS 1995 Ford Mondeo 1.8 LX 1990 Honda Concerto 1.6 EX 1986 Ford Orion 1.6 GL 1989 Ford Fiesta 1.1 Firefly |
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flyingalexf68
Really Senior Member II Joined: 01-April-2006 Location: 53°19’59,6°14’56 Status: Offline Points: 2581 |
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Will a 325 do 155mph? If so it will hit the limiter. My old 2.2 Z3 happily hit the rev limiter in 5th gear on the (empty) road. 139mph and still charging hard. It needed another gear. Thats a very good result Dave. You can be sure your car is running right anyway. See you at the next track day no doubt. |
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1995 e36 3.0 M3 Coupe, Daytona Violet, AP Racing BBK, CCFL Angel Eyes, M3 Spoiler, M-Tec 3 Steering Wheel.
2000 530d Steptronic, Poverty Spec, 18" Alloys. |
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Daveco
Really Senior Member I Joined: 23-June-2006 Location: Dublin Status: Offline Points: 253 |
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Cheers Alex/Stephen-I was very impressed with the result, the bloke who did the test said BMW are known for underestimating the power in their cars-He's had some 325's up and achieved 215hp-Now the big (slightly pointless) question is, am I quicker than a MK V Golf Gti??
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past-01 318ci auto, '01 318ci
present-'04 325ci sport future-no house and a 5 car garage |
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thepits
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But don't care. |
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Daveco
Really Senior Member I Joined: 23-June-2006 Location: Dublin Status: Offline Points: 253 |
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Thought so too...In fact why stop at a GTi?? Clearly in 911 territory now!
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past-01 318ci auto, '01 318ci
present-'04 325ci sport future-no house and a 5 car garage |
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flyingalexf68
Really Senior Member II Joined: 01-April-2006 Location: 53°19’59,6°14’56 Status: Offline Points: 2581 |
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Steady on there now. 911? Boxster territory maybe. |
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1995 e36 3.0 M3 Coupe, Daytona Violet, AP Racing BBK, CCFL Angel Eyes, M3 Spoiler, M-Tec 3 Steering Wheel.
2000 530d Steptronic, Poverty Spec, 18" Alloys. |
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