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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 > Helix Attache Questions



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      08-08-2008, 01:51 PM   #1
nj335i
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Helix Attache Questions

Does anyone know the boost targets for the updated map? How are they different from the previous map? I know that on the previous map, I would see spikes on shifts up to 16.5 psi, and now I think I've only seen 15 psi or so. Does this mean that there is less boost at higher rpms? Just wondering if the boost delivery is similar to JB3 or if it's a little more conservative...

The new map feels great though! Much smoother than before, and my MPG has been better than ever!
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      08-09-2008, 09:57 AM   #2
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Originally Posted by nj335i View Post
Does anyone know the boost targets for the updated map? How are they different from the previous map? I know that on the previous map, I would see spikes on shifts up to 16.5 psi, and now I think I've only seen 15 psi or so. Does this mean that there is less boost at higher rpms? Just wondering if the boost delivery is similar to JB3 or if it's a little more conservative...

The new map feels great though! Much smoother than before, and my MPG has been better than ever!
The 2 maps run similar boost targets but you will see slightly less spike on the newest revisions, boost in the upper rpms seems to hold better with this latest revision due to the fact we have more fuel at our disposal now. On a whole the boost control is perfect and stable as it has always been. our adaptive boost and fuel is working great as well ie if you add an intercooler etc the tune will auto tune itself (add boost and richen fuel), we can accomplish this by utilizing rpm-tps-map-iat sensor data. we are adding some optional equipment to the attache in the very near future I am sure EVERYONE will be interested in.

Glad you like the tune and the mpg improvements, we spent some time on that
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      08-09-2008, 05:02 PM   #3
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Thanks Mark!
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