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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > N55 ISO Boost targets



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      04-06-2013, 12:43 AM   #1
Jdub679
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N55 ISO Boost targets

On map 5, I was seeing my boost hijack go 3/4 of the way up the scale. I think that corresponds to around 17ish psi. Does that sound right?

I'm on Cal 91 octane.

To be fair, I just finished the ISO mod and drove around the block real quick. So I haven't given it enough time for adaptation.

On the other side, it DOES feel smoother. I didn't think that subjectively I'd feel that much of a difference, but WOW.
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      04-06-2013, 06:34 AM   #2
madmanhiker
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log your runs in 3rd gear starting at approx 2000 rpm w/o the kick down switch to WOT. but to "roughly" translate 3/4 on the hijack would be about 16-17 psi.

Logs tell you everything you need to know. -highly recommended when tuning....
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      04-06-2013, 01:35 PM   #3
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Thanks Mad.

Just finished the install last night, but the logs are next on my list.
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