S40: - 2.0D Dyno results

jcvosloo · Oct 12th, 2009, 20:34

Hi guys,

I own a 2005 S40 2.0D. I recently took it for a dyno and the results concluded that the max BHP was only 115 at 4000rp. The booklet state that the BHP should be 135 BHP. The engin sounds good, and the car doesn't have any other problems.

Do you think a loss of 20BHP is reason for concern?

Clan · Oct 12th, 2009, 21:18

dyno's are all different , and can only be used for comparison between before and after modifications really . If your top speed and 0 - 70 mph times are about as per road test magazines then it will be producing the correct power .
If the 115 bhp was measured at the wheels thats not bad at all . The flywheel figure is calcilated from the power measured at the wheels on a rolling road Dyno . the only useful measurment from a dyno is fron a true dynamometer , ie , one which the engine is screwed to on a frame out of the car ..

Robbijay · Oct 12th, 2009, 22:18

Like Clan said, are you sure it wasn't just measuring whp instead of bhp? transmission loss of 15% seems ok ish.

Ben Hur · Oct 13th, 2009, 00:28

I think it is because of lower air density.

You're in Pretoria, which is 1,370 m (4,495 ft) above sea level. You should consider that a test done with the lower air density at this altitude would show a lower power result than a test close to sea level. An altitude of 5,000 ft could show the engine producing about 81.1% of the rated horsepower.

jcvosloo · Oct 13th, 2009, 17:10

Hi Guys,

Thanks for the replies!

Hehe, Clan you just gave me reason to clean the old man's throat!

Also wandered about the altitude. I will contact the people who did the dyno and then give some feedback.

Oct 12th, 2009, 20:34	#1
jcvosloo New Member Last Online: Feb 22nd, 2011 17:07 Join Date: Oct 2009 Location: Pretoria	2.0D Dyno results Hi guys, I own a 2005 S40 2.0D. I recently took it for a dyno and the results concluded that the max BHP was only 115 at 4000rp. The booklet state that the BHP should be 135 BHP. The engin sounds good, and the car doesn't have any other problems. Do you think a loss of 20BHP is reason for concern?

Oct 12th, 2009, 21:18	#2
Clan Experienced Member Last Online: Yesterday 23:25 Join Date: Jun 2007 Location: L/H side	dyno's are all different , and can only be used for comparison between before and after modifications really . If your top speed and 0 - 70 mph times are about as per road test magazines then it will be producing the correct power . If the 115 bhp was measured at the wheels thats not bad at all . The flywheel figure is calcilated from the power measured at the wheels on a rolling road Dyno . the only useful measurment from a dyno is fron a true dynamometer , ie , one which the engine is screwed to on a frame out of the car .. __________________ My comments are only based on my opinions and vast experience .

Oct 12th, 2009, 22:18	#3
Robbijay S60 D5 SE + Winter Pack Last Online: Oct 10th, 2017 09:11 Join Date: Oct 2006 Location: Gloucester View Photos By: Robbijay	Like Clan said, are you sure it wasn't just measuring whp instead of bhp? transmission loss of 15% seems ok ish.

Oct 13th, 2009, 00:28	#4
Ben Hur Member Last Online: Apr 7th, 2017 23:59 Join Date: Aug 2009 Location: Woking	I think it is because of lower air density. You're in Pretoria, which is 1,370 m (4,495 ft) above sea level. You should consider that a test done with the lower air density at this altitude would show a lower power result than a test close to sea level. An altitude of 5,000 ft could show the engine producing about 81.1% of the rated horsepower.

Oct 13th, 2009, 17:10	#5
jcvosloo New Member Last Online: Feb 22nd, 2011 17:07 Join Date: Oct 2009 Location: Pretoria	Hi Guys, Thanks for the replies! Hehe, Clan you just gave me reason to clean the old man's throat! Also wandered about the altitude. I will contact the people who did the dyno and then give some feedback.

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