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      02-01-2013, 12:41 PM   #23
urBan_dK
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Too much smoothing to pick up on many dips or spikes, unfortunately.

Kao- unless the AFR meter was hooked up incorrectly, you are running extremely rich...over a point too rich.
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      02-01-2013, 02:34 PM   #24
Transfer
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I sent Mike Benvo a link to this thread and just spoke with him and he brought up some pretty good points about why results on all the cars dynoed were not expected. First off I had concerns with air flow from the beginning and that's probably a pretty big reason we're low reading. They had one wussy fan when I've seen M3s dynoed with 4 MONSTER fans. There was not good air flow. Also, the placement on rollers and strapping was a little wishy washy and he thought that could make differences too. And then there's other stuff like wheel/tire diameters, etc. But overall, it's too hard to see an improvement from a tune unless you get a baseline, tune it while still on the rollers, and then run it again. All I know is the car does not at all feel like it did before the tune and I'm happy with it's performance. I just wish I hadn't even bothered doing a dyno run but hey, I had a great time hanging out with everyone. Next little meet up we'll do a drive instead.

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      02-01-2013, 04:12 PM   #25
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Originally Posted by Transfer View Post
Also, the placement on rollers and strapping was a little wishy washy and he thought that could make differences too.

Was it you that pointed out the position of your tires on the rollers? I remember after I ran my 1M, someone mentioned that they were sitting on the crown of the rollers, where as I remember my car's tires were positioned just forward of the crown.
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      02-01-2013, 11:00 PM   #26
Mike Benvo
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Quote:
Originally Posted by RPMjunkie
Quote:
Originally Posted by Transfer View Post
Also, the placement on rollers and strapping was a little wishy washy and he thought that could make differences too.

Was it you that pointed out the position of your tires on the rollers? I remember after I ran my 1M, someone mentioned that they were sitting on the crown of the rollers, where as I remember my car's tires were positioned just forward of the crown.
Posting from mobile.

How the car sits on the rollers / strap down can make a big difference.

Years ago when my car was being dynoed at Gintani, the car jumped up on the rollers and made 20 whp more.

I've seen strap down tension account for 15ish hp, and fans are very important to keep IATs down or the car will not hit its ignition targets.
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