335i n54 no power till 4500rpm... help?

redstu21 · 12-31-2014, 03:35 PM

Pretty new here, but not a newbe when it comes to bmws or n54s.
Like I said having trouble with my car no low down power till dead on 4500rpm. Then bang will spin wheels even at 80
No fault codes.
I'm fbo. Run 105 race fuel and 6at.
So far I have checked charge pipe.
Divert valves for week /broken springs.
Renewed vacuum hoses from pump to boost valves.
Anything else would be helpful, kinda going mad...

parksjm7 · 12-31-2014, 03:54 PM

If you have an older car, boost solenoids come to mind. Changed mine to the updated part number not too long ago which solved my issue - similar as yours

umut335i · 12-31-2014, 11:48 PM

I had the same issue. Thought I had checked the blow off valve, though when I checked it the second time it had popped off. Got my mechanic to replace it with a clamp/fastener rather than a C clip then hey presto had my power back at low revs.

Maybe book it in to a garage? I'm on my mobile so can't see where you're from?

Are you sure both turbos are okay? What about taking a look at others experiencing the same issues?

Here's one I found;

http://www.e90post.com/forums/showthread.php?t=968480

12-31-2014, 03:35 PM	#1
redstu21 Registered 0 Rep 1 Posts Drives: 335is n54 Join Date: Dec 2014 Location: scotland iTrader: (0)	335i n54 no power till 4500rpm... help? Pretty new here, but not a newbe when it comes to bmws or n54s. Like I said having trouble with my car no low down power till dead on 4500rpm. Then bang will spin wheels even at 80 No fault codes. I'm fbo. Run 105 race fuel and 6at. So far I have checked charge pipe. Divert valves for week /broken springs. Renewed vacuum hoses from pump to boost valves. Anything else would be helpful, kinda going mad...
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12-31-2014, 03:54 PM	#2
parksjm7 Banned 81 Rep 228 Posts Drives: E92 07 335i Join Date: May 2012 Location: Edison, NJ iTrader: (0) Garage List 2007 BMW 335i [0.00] 2002 Honda [0.00]	If you have an older car, boost solenoids come to mind. Changed mine to the updated part number not too long ago which solved my issue - similar as yours
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12-31-2014, 11:48 PM	#3
umut335i Lieutenant 29 Rep 407 Posts Drives: 335i Convertible 2007 Join Date: May 2014 Location: Kent UK iTrader: (0)	I had the same issue. Thought I had checked the blow off valve, though when I checked it the second time it had popped off. Got my mechanic to replace it with a clamp/fastener rather than a C clip then hey presto had my power back at low revs. Maybe book it in to a garage? I'm on my mobile so can't see where you're from? Are you sure both turbos are okay? What about taking a look at others experiencing the same issues? Here's one I found; http://www.e90post.com/forums/showthread.php?t=968480
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