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View Full Version : Dynoed my VF Stage 2 M3...

docwyte
05-01-2009, 04:44 PM
Well, just got done dynoing my VF Stage 2. Here is my setup....
Off the shelf VF Stage 2 supercharger.
Agency power headers
European Cats
UUC Rasp-X section 2
Dinan rear muffler

All runs were done on 91 Octane bought at the local supermarket gas station.

In case the chart is fuzzy, the car made 485.68 hp and 328.27 ft lbs to the rear wheels.

There was no heat soak to speak of. We did 3 runs and they were within 0.5 hp and 0.7 ft lbs of each other. With 100 octane race fuel it's clear I'd make well over 500 hp to the rear wheels!

No hiccups, starts everytime, works in temperatures ranging from +2F to over 90F. I'm taking it to the road course in two weeks for three consecutive days of lapping.

http://i20.photobucket.com/albums/b233/docwyte/IMG_1256_6_1.jpg
http://i20.photobucket.com/albums/b233/docwyte/IMG_1248_1_1.jpg
http://i20.photobucket.com/albums/b233/docwyte/IMG_1249_2_1.jpg
http://i20.photobucket.com/albums/b233/docwyte/IMG_1250_3_1.jpg
http://i20.photobucket.com/albums/b233/docwyte/IMG_1251_4_1.jpg
http://i20.photobucket.com/albums/b233/docwyte/IMG_1253_5_1.jpg
A55A55IN
05-01-2009, 04:49 PM
nice numbers! That's not a VFE intake manifold is it?
jeffgm3conv
05-01-2009, 05:03 PM
Great numbers!! I only made 475 on 93 octane, so looks like you've got a strong car! Congrats!
docwyte
05-01-2009, 05:04 PM
Nope, that's a VF manifold, it's just been polished and my sponsoring shop slapped one of their stickers on it.
MSpired
05-01-2009, 05:12 PM
Congrats on the excellent numbers man
M3 2 NV
05-01-2009, 05:41 PM
Good numbers! How are the brakes working out? I noticed the hitch...what do you tow? I made one for my E36 M3 to lug a seadoo around. It looked cool, dakar yellow dumped towing an seadoo XPL which was yellow and black lol

Have fun at the track!
docwyte
05-01-2009, 05:53 PM
I love the Stoptechs, they're great!

I tow a small trailer to the track. It holds my race wheels and has a tool box with all my tools, helmet, race suit etc in it. The only thing I put in the car is my bag of clothes.
SPDu4ea
05-01-2009, 06:07 PM
You dynoed 486rwhp on 91 octane in Denver? Very strong man, congrats!
MSpired
05-01-2009, 06:29 PM
I forgot about your altitude. What were your uncorrected numbers?
docwyte
05-01-2009, 06:40 PM
Uncorrected was 400 hp and 272 torque.

I asked the shop about the correction and they have a weather center that measures humidity, barometric pressure and temperature and uses that information to come up with the correction factor. They've dynoed cars at sea level and then at their shop and apparently the numbers were basically the same.
MSpired
05-01-2009, 06:46 PM
Uncorrected was 400 hp and 272 torque.

I asked the shop about the correction and they have a weather center that measures humidity, barometric pressure and temperature and uses that information to come up with the correction factor. They've dynoed cars at sea level and then at their shop and apparently the numbers were basically the same.

Damn, that's a pretty big robbing right there. Drive down to sea level and put in some ms109, it'll probably feel like your supercharged all over again
yellowssm
05-01-2009, 07:08 PM
Uncorrected was 400 hp and 272 torque.

I asked the shop about the correction and they have a weather center that measures humidity, barometric pressure and temperature and uses that information to come up with the correction factor. They've dynoed cars at sea level and then at their shop and apparently the numbers were basically the same.

excuss my ignorance but I though uncorrected numbers were higher?
azzy989
05-01-2009, 07:18 PM
nope^^ due to the altitude there is a lot less air in denver than there is at sealevel.


great numbers doc :)
SPDu4ea
05-01-2009, 08:17 PM
excuss my ignorance but I though uncorrected numbers were higher?

Depends -- SAE correction attempts to calculate the power an engine would make at a standard temperature/pressure.

If you're at sea level and at a colder location (say HPF's shop in Portland, OR) the uncorrected numbers will almost always be higher than SAE.

If you're in Las Vegas in the summer, the elevation and the heat will reduce the density of air (meaning less oxygen is available in a given volume) so the uncorrected numbers will be lower.
Nik@vf-engineering
05-01-2009, 10:15 PM
Great numbers Doc. SAE is industry standard.
docwyte
05-01-2009, 10:59 PM
Thanks Nik!

The standard rule of thumb is the car loses 3% of it's power for every 1000 feet over sea level you are. The shop was at 6000 feet, so figure about 18%. Which is what my corrected vs uncorrected numbers show...

I'm going to a track event in Hastings Nebraska in August, which is much closer to sea level. Should gain quite a bit of power there!