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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Dyno before and after walnut blasting?



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      06-11-2012, 07:40 AM   #1
kingofqueenz
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Dyno before and after walnut blasting?

Has anyone done a dyno before and after walnut shell blasting?

I am curious if that buildup makes a big difference in decreasing power.
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      06-11-2012, 07:47 AM   #2
Jon335iFL
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Quote:
Originally Posted by kingofqueenz View Post
Has anyone done a dyno before and after walnut shell blasting?

I am curious if that buildup makes a big difference in decreasing power.
I think the main effect is on throttle response and overall longevity of the motor. I doubt anyone picked up a significant amount of HP.
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      06-11-2012, 08:22 AM   #3
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Really depends how bad your valves are clogged up. I've seen people with some pretty awful looking intake valves & they reported gains between 10-20 HP. Not that it's a neglibile amount, but the throttle response & smooth power delivery are going to be much more noticeable.
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      06-11-2012, 09:22 AM   #4
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Mr. 5 did a dyno about a year or so back.
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      06-11-2012, 09:29 AM   #5
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Originally Posted by Tzu View Post
Mr. 5 did a dyno about a year or so back.
He gained 10 whp IIRC.
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      06-11-2012, 06:36 PM   #6
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How would dirty valves affect engine longevity?
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      06-11-2012, 07:51 PM   #7
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I had a before/after done, but it was sitting on the dyno when the valves were cleaned, and I don't think it had any time to adapt to the cleaned valves...I ended up losing a good bit up top on the dyno, but felt much better driving it and the idle was rock solid. I never got back to see what it looked like after adapting.

Blue is before and red is after



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