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      01-21-2013, 10:51 PM   #1
radiantm3
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Drives: >1000 HP in my garage
Join Date: Sep 2008
Location: Danville, CA

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2011 E92 M3  [4.80]
2013 BMW X5M  [4.33]
Supercharged vs NA at the track Part 2. (Results are shocking)



Iíve done 6 track days with the ESS 535 Supercharger kit and while the difference in power is substantial on the street, I couldnít help but feel disappointed with it at the track. Hereís a post I wrote up after my first track day with the supercharger. As you can see I was skeptical from day 1. My times were decent so most people attributed that to the supercharger and said the car just doesnít ďfeelĒ as fast to me because Iím at the track. However, acceleration on the street just felt so different to me. After 6 track days, I was convinced that the supercharger wasnít making much if at all any extra power at the track so I decided to remove it and see what times I could pull without it. Initially I was guessing Iíd be maybe 1-2 seconds slower without the blower, but the numbers seem to speak for themselves.

There were no track days in between these 2 dates. So substantial improvement in driving skill could not have played a factor. The only change aside from removing the supercharger was going from 18Ē TE37SLís to 18Ē BBS FIís. The FIís are less than a pound lighter. The exact same tires were used (Yokohama AD08).

My goal isnít to speak badly of ESS. I still think the ESS 535 is their best kit and as you can see from the temperature comparisons, it handles heat great from a safety perspective. If you donít track your car often, I highly recommend the 535 (or whatever the equivalent is now). But for me personally, I decided to go back to stock because I wasnít happy with the lack of (extra) power at the track, the ever so slightly slower throttle response, and the non-linear power delivery that no one else seems to notice but me. Itís not something you really notice on the street when you have your foot buried, but at the track where precision is key, you can definitely feel a difference.

So while Iím no longer running the ESS supercharger, Iím extremely happy with their NA tune.

I'm trying to be as unbiased as possible and provide facts. It should be noted that I'm not a professional driver. I just wanted to provide some numbers from my fastest lap from my last 2 track days.
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