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      02-02-2013, 12:00 AM   #26
Mike Benvo
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Drives: Harrop M3 / F10 M5 / F82 M4
Join Date: Apr 2008
Location: SoCal

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2000 BMW M5  [0.00]
1990 BMW 735i Turbo  [0.00]
2008 BMW M3  [3.75]
2015 BMW M3  [0.00]
2015 BMW M5  [0.00]
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Originally Posted by RPMjunkie
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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