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28i - Possible Boost Issue?

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SteveSmith
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28i - Possible Boost Issue?

Post by SteveSmith » Fri Jun 30, 2017 6:08 pm

Hi guys,

Driving home tonight with the roof down in sports mode and manual mode and whilst off the throttle I thought I heard a bit of a "dump valve" noise.

When I pressed on it didn't sound the same, you normally hear a bit of spooling etc plus it didn't feel as fast.

I've tried to look for any lose hoses etc but can't see anything.

Then I booted it again and it felt ok, then the next time it felt flat again.

Is there any common faults like this? Could the "dump valve" be sticking?
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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28i - Possible Boost Issue?

Post by SteveSmith » Fri Jun 30, 2017 8:32 pm

Could it be the exhaust valve jammed closed? Or not opening on occasion? It seems fine one minute then it's very muted on downshifts another.
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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john-e89
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28i - Possible Boost Issue?

Post by john-e89 » Fri Jun 30, 2017 8:41 pm

My thought went to an intermittent sticking wastgate Steve, if you can get to it spray some releasing fluid on it, it won't hurt, might smell a bit is all. Worth a try before you open your purse.. :)
M roady...OEM CSL’s, strut brace, Remus back boxes, ZHP
MR2 MK 2
E89 35i project car...mapped 365bhp, M4 stoppers & wheels, KWV3’s, H&R front ARB, M3 front arms, strut brace Eisenmann cat back race exhaust, VRSF downpipes inbound
E89 35is
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SteveSmith
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28i - Possible Boost Issue?

Post by SteveSmith » Fri Jun 30, 2017 8:47 pm

john-e89 wrote: Fri Jun 30, 2017 8:41 pm My thought went to an intermittent sticking wastgate Steve, if you can get to it spray some releasing fluid on it, it won't hurt, might smell a bit is all. Worth a try before you open your purse.. :)

That would definitely make sense! Thank you!

Any ideas where the waste gate is!?
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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28i - Possible Boost Issue?

Post by Smartbear » Fri Jun 30, 2017 9:11 pm

SteveSmith wrote: Fri Jun 30, 2017 8:47 pm
john-e89 wrote: Fri Jun 30, 2017 8:41 pm My thought went to an intermittent sticking wastgate Steve, if you can get to it spray some releasing fluid on it, it won't hurt, might smell a bit is all. Worth a try before you open your purse.. :)

That would definitely make sense! Thank you!

Any ideas where the waste gate is!?
Hi Steve, your car either has a pneumatic wastegate actuator or a solonoid controlled one depending on date of manufacture-either can go wrong.
They are located on the l/h side of the engine as the turbo is part of the exhaust manifold
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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28i - Possible Boost Issue?

Post by SteveSmith » Fri Jun 30, 2017 9:26 pm

Nice one! I'll have a look in the morning when it's cold!
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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28i - Possible Boost Issue?

Post by john-e89 » Fri Jun 30, 2017 9:28 pm

I'm thinking actuator rod linkage as well. look on google where the turbo is and spray fluid in that area, I doubt you'll be able to get your head in there, or use a mirror,. The manifold will smoke afterwards but it'll soon dry off. That's not a long term solution but if it frees up for a day or two you'll know it's that.
M roady...OEM CSL’s, strut brace, Remus back boxes, ZHP
MR2 MK 2
E89 35i project car...mapped 365bhp, M4 stoppers & wheels, KWV3’s, H&R front ARB, M3 front arms, strut brace Eisenmann cat back race exhaust, VRSF downpipes inbound
E89 35is
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28i - Possible Boost Issue?

Post by Twin Turbo » Fri Jun 30, 2017 9:34 pm

I would use and OBC reader - is there an owner near you with a carly?

viewtopic.php?f=2&t=97818&p=1438351&hil ... y#p1438351

Quick 10 minutes - will help to find out what the issue is.

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SteveSmith
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28i - Possible Boost Issue?

Post by SteveSmith » Fri Jun 30, 2017 11:49 pm

I have no engine management light.
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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28i - Possible Boost Issue?

Post by Smartbear » Sat Jul 01, 2017 7:28 am

SteveSmith wrote: Fri Jun 30, 2017 11:49 pm I have no engine management light.
Sometimes there can be a stored code despite there being no engine light on the dash :thumbsup:
Rob
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e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
e85 3.0si sold

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28i - Possible Boost Issue?

Post by SteveSmith » Sat Jul 01, 2017 11:34 am

Right, definitely the waste gate arm so thank you for that suggestion!

It was "out" when I first went to the car this morning, after about 30 seconds of driving it went back to normal, it's now returning and feels fine.

I'll keep my eye on it!
28i M Sport - Alpine White / Canberra Beige, 19" M359’s, H&R’s / Eibachs, BMS Stage 1 - 271bhp, Front Splitter, CF Rear Lip, Alcantara Steering Wheel and Brembo 4 pots

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