Major Problem with Dynoing the Dinan E30 Turbo

[jrhaile]

So I went in for dyno today and something was NOT right at all. The dyno graphs were all over the place and VERY VERY low. At one point it made 230whp and 304ft-lbs! WTF? Then it went as low as 170whp and 190ft-lbs. It seemed as soon as the turbo really hit full boost, the numbers were all over the place. The guy who did this dyno was utterly confused as was I. I was making full boost and it sounded fine and the rpms/speedometer shot up like it normally does. I'm still shaking my head. Funny thing is, after the dyno we went out and did a roll start against his 270whp mustang and I beat him up to 120mph pretty good.
Anyone have any ideas what could be wrong? Tire slip on the track? He swears it wasn't happening, but I'm not convinced. I was running rich in higher rpms, but not to the point where it would throw the numbers all over the place imo. I have videos if anyone wants them and I have a couple of the dyno graphcs. I'm at a major loss with this one... we did about 10 pulls too because all of them with numbers all over the place. Any help is appreciated.

[var1ant]

mustangs are much heavier than you fyi. I think you might be slipping a little on that 170hp run but 230 sounds ok. Not a turbo expert here just throwing it out.

[jrhaile]

thing is, I went from 1 230whp to the next one at like 170whp and then hit a whopping 301whp. It was so damn sparatic that I didn't know what to think.

[SchnellerVert]

If you really want to get an accurate dyno reading use the dynapack method. It is sensitive to as little as a turn on the rear defroster switch.

[jrhaile]

If you really want to get an accurate dyno reading use the dynapack method. It is sensitive to as little as a turn on the rear defroster switch.

What is this? I'm new to the whole dyno and f/i world :)

[SchnellerVert]

This units eliminates the drive line slop of the large drum style dynos. Dynos are variable anyway dependant on many factors.

http://www.ultimategarage.com/dynapack.html

[jrhaile]

geezz, must cost a fortune to do it!

[Mystikal]

What did the A/F curves look like on each run? Similiar?

[jrhaile]

All very similiar even on the good runs...

[SchnellerVert]

No I ran on a local one recently for $50 for 3 pulls.

[jrhaile]

No I ran on a local one recently for $50 for 3 pulls.

oh well I don't know of anyone in Spokane who has this :(

[jrhaile]

http://www.nwbmwclub.com/videos/MVI_0726.avi
http://www.nwbmwclub.com/videos/MVI_0727.avi
http://www.nwbmwclub.com/videos/MVI_0728.avi
http://www.nwbmwclub.com/videos/MVI_0730.avi

those are the vids.. right click save as. Sorry they're kind of big for what they are.. I took them with my digital camera.

[Mystikal]

If the car feels consistent on the road, then something is obviously wrong with the dyno.

Does you area have many places with rollers? We have some every couple highway exits, big cities rock for that.

[jrhaile]

Yeah I have one in my town that I know about unless I want to drive about 60 miles to Kellog, Idaho or go to Seattle

[SchnellerVert]

Sounds like it was slipping on the dyno. Wheelspin as boost came up.

I will suggest that it sounds like it needs a valve adjustment.