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      10-25-2015, 07:15 PM   #1
Eat.Sleep.Race
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Power loss after a few pulls.

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All so I have a N55 335i with BMS intake, 3.5 inch downpipe and JB4 (most recent).

On Map 2 the car runs great for a gear or 2 pull. But if i do a 40-120 pull it almost seems like by 5k rpm in 3rd the car starts to bog hard. Like as if it is pulling timing, or losing boost.

Has anyone had something similar? Do i just need to do an upgraded FMIC and hope that solves it. It really does bog pretty hard to where its noticeable to my passengers. Im new to this motor and i know my n54 did not have this issue.

Also when i put it in Map 5, it does it all the time. I did note that the boost solenoids are making a humming type noise, and sometimes on start up the car is jerky to the point where i have to let it warm up for a while, restart the car for it to run right. The vehicle has 20k miles.

Any help would be great
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      10-25-2015, 08:09 PM   #2
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Seems to me I read awhile back about another member having the same issue. If memory serves me correctly, the GFB DV+ Performance Diverter was recommended.

Edit: Do you also have a aftermarket charge pipe (namely the ER Charge pipe)? If not, I'd strongly recommend it!
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      10-25-2015, 09:23 PM   #3
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doing a log will help know the issue if boost leak or high intake air temps.
or maybe you don't know that N55 stock turbos isn't efficient at high rpm + high boost.
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      10-25-2015, 09:49 PM   #4
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Quote:
Originally Posted by M-terkait View Post
doing a log will help know the issue if boost leak or high intake air temps.
or maybe you don't know that N55 stock turbos isn't efficient at high rpm + high boost.
Log would help.. Might be the stock FMIC heat soaking.

You have the JB4 so log and we can see your IAT.

Mike
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      10-26-2015, 09:44 AM   #5
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
Log would help.. Might be the stock FMIC heat soaking.

You have the JB4 so log and we can see your IAT.

Mike
ok i will log it today.

Thanks,

Garrett
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      10-27-2015, 08:00 PM   #6
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Quote:
Originally Posted by Eat.Sleep.Race View Post
ok i will log it today.

Thanks,

Garrett
Great...

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      10-28-2015, 04:07 PM   #7
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still haven't been able to log, any other suggestions if it isn't IAT? I was running a blend of e30 in the car and it was 50 degrees outside, with no humidity. SO the more i think about it, its not going to be heat soak. How likely is the diverter valve failing on these cars?
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      10-28-2015, 07:53 PM   #8
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Quote:
Originally Posted by Eat.Sleep.Race View Post
still haven't been able to log, any other suggestions if it isn't IAT? I was running a blend of e30 in the car and it was 50 degrees outside, with no humidity. SO the more i think about it, its not going to be heat soak. How likely is the diverter valve failing on these cars?
Don't think it's a matter of failure, think it's more of a weak link (boost leaking).

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      10-28-2015, 07:58 PM   #9
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Quote:
Originally Posted by Eat.Sleep.Race View Post
still haven't been able to log, any other suggestions if it isn't IAT? I was running a blend of e30 in the car and it was 50 degrees outside, with no humidity. SO the more i think about it, its not going to be heat soak. How likely is the diverter valve failing on these cars?
Giving you suggestions without logs or engine codes is going to waste your time rather than help you solve the issue.
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      10-28-2015, 08:00 PM   #10
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Quote:
Originally Posted by mike@x-ph.com View Post
Giving you suggestions without logs or engine codes is going to waste your time rather than help you solve the issue.
+1 Very true...you'll end up chasing the wrong rabbit down the wrong hole.

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      10-29-2015, 09:58 AM   #11
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yup, thats why logs are VERY important along with codes if applicable.

Mike
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      10-29-2015, 11:13 AM   #12
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Stock FMIC is not great, wasn't great on the N54 either. You know this

If you want back to back consistent power an FMIC is a must. I don't need logs to know that.

However, a log may find something further. If your boost solenoids are louder then normal, they may need replacement and that can affect power up top too and efficiency.

Give them a light tap and see if the noise goes away.

Only takes 15 seconds to log. Get out there and do a 3rd gear pull
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