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Discussion Starter #1
Hey All,

This is very similar to a thread recently created however my car has a closed egr valve and remap etc so that cant be the cause.

Basically when i accelerate slowly (in any gear), but lets say 2nd gear, the turbo spools up to about 1bar and and revs climb nicely. However as soon as i get over 2500rpm or if i press the accelerator a tad more, the turbo guage falls all the way to 0.4bar and the only way to wake it up and get it boosting full is by burying my right foot. This happens in any gear. Applying half throttle results in a drastic drop in boost around the 2500rpm mark.

Since i have changed the exhaust system, it is far more noticeable as the noise becomes completely different. Rather than hearing the wooshing of the turbo its just engine note.

Just to reiterate, if i floor it, the turbo boost guage may flutter around 1.3 to 1.5 bar but it HOLDs boost. Anything other than full throttle results in spool up to 1bar and then a big drop.

Im thinking this is either a boost leak, actuator or the boost controler/solenoid.

Any ideas / help will be much appreciated.

Stefano
 

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Discussion Starter #4
Will defo try this thanks Clogz. I'm praying for a boost leak but the signs aren't really consistent with it. Anyone else know of the actuator going? Veins? Solenoid etc
 

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Will defo try this thanks Clogz. I'm praying for a boost leak but the signs aren't really consistent with it. Anyone else know of the actuator going? Veins? Solenoid etc
That sounds like a far more extreme version of what happens to mine between 1700 and 2000rpm.
On s steady throttle when accelerating in 2nd/3rd the boost will suddenly drop off for an instant, then pick up again.
Mine pulls through this zone on harder acceleration and strongly after the "blip".

Like yours, remapped and EGR deleted, even had a blanking plate added as an addition and replaced the solenoid, without eliminatiing it fully. :confused:
Hoping it's not the turbo vanes, but preparing myself for the worst. Been speaking to Gus about it and plan to go over soon the let him loose on it.
 

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Discussion Starter #6
Sounds very similar Steeler if you nail the throttle you may have a slight blip but it holds boost (All be it not the level it used to hold) but slow acceleration results in a monumental drop of boost. I thought it might be due to my turbo getting on a bit (92k miles). I have the BV turbo whereas if yours is 2009 it will have the Garrett. Lets hope its nothing sinister. So you replaced the turbo solenoid?
 

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I have the same issues also, and also all before EGR removal. I was thinking that is something wrong in the removal procedure and I was spoken with a lor of tuners, and there is nothing wrong with the map. I think in removing the turbo and have a look to the geometry and also to the VGT valve. Any opinion?
 

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Im just trying to think if it always did this post remap? Surely not. Steeler can you confirm the same?
Sorry to hear of your troubles Stef.

It won't be your remap. :cool:

I'd also think that the effect you are describing is too severe not to have noticed before. In other words - it's probably something fairly recent...

Maybe let a specialist who know what he's doing take a look?

Good luck.
 

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Im just trying to think if it always did this post remap? Surely not. Steeler can you confirm the same?
Hi Stefanocirillo,

Mine did it worse than now prior to the re-map, which was one of the reasons to have the work done anyway, as it was intially thought to be EGR linked, but obviously not 100% of the cause.

Replaced the solenoid as a precaution to rule out another possible cause of the "blip".
Also had the "throttle body" /inlet manifold cleaned out, run various fuel addatives /cleaners through it, only use BP Ultimate/Total Excellium and taken it for many "italian services" at or near the red line up and down the M18, but it's still there.
 

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Discussion Starter #12
I only ever use BP Ultimate also. I'm betting on the turbo vanes being clogged. But then again could be a monumental boost leak somewhere. I'm having my decat pipe fitted now so who knows the CAT may be causing it. Will let you know what happens.....
 

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Discussion Starter #13
Car is out of the garage. No boost leaks. Turbo is leaking a bit of oil but not enough to be the cause of this. Should the turbo ever boost to 1.6bar? My car never even touches it. I think I'm going to keep driving it till it gets worse. Then it's new turbo time :(
 

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Hi All,

This is my first posting, so please excuse the length, but I read this thread and thought, this just happened to me.

I've just had my 2008 2.4 JTDM Brera remapped, DPF and EGR disabled by Gareth of Avon Tuning, just north of Bristol and*He had a real problem with the car.

The DPF removal went to plan, disabled correctly (took a while to remove all references to the DPF) and the EGR blanked and disabled correctly.

A stage 1 remap was done (best economy) but upon road testing, the car's boost went off between 2000 and 3000 rpm. He thought there was problems with the EGR and tried numerous things, but it still had a problem. *No problems with error codes etc, the car was otherwise fine.

3 hours extra later, he found the problem. My car (2008 model) has a torque limiter in the ECU, to protect too much torque damaging the clutch. He'd dialed in and extra 80nm of torque and that was just too much. So, he reduced the torque to 75nm and raised the bhp slightly to compensate and the boost is now solid all the way through, goes like a train.

So, I would see if you can get the torque curves checked on the remap, this was definitely the problem with mine.

Oh, and I have to say that Gareth was very knowledgable and thorough in the remap (I'd done a lot of forum reading up before speaking to him and he knew everything To look out for and more).

Cheers :)
 

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Steeler, any updates? I'm looking at a new turbo after Xmas :(. Tried pretty much everything else.....
Hi Stefanocirillo,

Sorry to hear your fix didn't work.

Mine's booked is booked in for mid Feb for the turbo to be removed and overhauled by a specialist my independent garage knows of.

Its a cheaper option than a new / pattern part replacement, so fingers crossed and post the results.

What options are you exploring now, after a new turbo didn't cure it?
 

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Discussion Starter #20 (Edited)
Hi Stefanocirillo,

Sorry to hear your fix didn't work.

Mine's booked is booked in for mid Feb for the turbo to be removed and overhauled by a specialist my independent garage knows of.

Its a cheaper option than a new / pattern part replacement, so fingers crossed and post the results.

What options are you exploring now, after a new turbo didn't cure it?
Over Xmas i had a brand new turbo fitted. We sent the old one off and turns out it was nackered!

I took it to Adie at AHM now and he thinks all is good with the new turbo. With my foot down it pulls like a train its just on partial acceleration that the turbo doesn't seem to spool all the way up. Apparently its normal as its not got enough pressure to spool it all the way....
 
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