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I am thinking of doing the Mr Muscle treatment for the turbo on my bxe skoda 4x4. From all the posts I have read, this is usually done when the car is going in to limp mode. My car isn't doing that, so is there any risk to doing it, other than obviously making sure the car has cooled down.

 

I have had the car for 2 years. It has always seemed a bit flat, I figured that was perhaps how they are, and hoped a remap would perk it up. The stage 1 remap seemed to do very little unfortunately. I also had the egr deleted at the same time. I also think it is a little down on fuel economy, around 41/42 usually, a bit better on a run, but just a bit down on what I expected, and it seems to be hard work to get any better than that.

 

There are no fault codes. Other than above, the only other thing is an intermittent stutter in 3rd gear on light acceleration. 

 

The previous owner used the car very little, 2000 miles a year for 3 years.

 

Could carbon build up on the turbo vanes, a turbo issue, or anything else be responsible for the flat performance, fuel consumption, slight hesitation in 3rd, and a remap having little effect? 

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Would be very useful to do some logs to see what the turbo is actually doing before proceeding any further. Also when was your cambelt changed and what torsion value it is set to?

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It had the cambelt done when bought from main dealer 2 years ago. Is checking the torsion value an easy job? My brother plugged in his lap top and had turbo numbers checked just after I bought it, initially he thought there was an initial lack of boost followed by a sudden bug surge, but then said he had been comparing numbers with the wrong engine code, and it was within parameters. Can easy get it done again. 

 

It was a Shark stage 1, I don't think the remap was the issue, I think there is something not quite right with the car so it didn't benefit from the chip. I am assuming turbo. Will probably try Mr Muscle first.

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There is no point to go Mr Muscle route if the vanes are not sticking...

Log group 11 in engine tab (in vcds), 3rd or 4th gear, full throtle from 1500 to 4000rpm and attach the log file here.

Sent from my XT890 using Tapatalk

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  • 4 weeks later...

As you can see from the graph below, your turbo isn't working as it should, small overboost would be fine but 500mbar is too much. Mr. Muscle treatment won't have any effect on this. Do you know if the turbo is still original one or if previous owner replaced it?

post-108823-0-29981300-1469440684_thumb.jpg

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I am pretty confident that it is the original turbo, I believe it has been like this since I bought it two years ago, forgive my ignorance, I take it the graph shows initial under boost, followed by over boost. Would the over boost probably cause the slight stutter as it backs off?? May it also explain why the re map had little effect?? I am surprised that nothing came up when the re map was done but i can discuss that with the lad that did it. What would you suggest is at fault and where should I go from here?? It runs okay, but I would prefer it to run better if possible!! Many thanks for your help

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On the graph, the red line represents amount of boost which ecu requests from the turbo, the green one is actual pressure read from the map sensor and blue one represents amount of vacuum applied by n75 valve.

The "underboost" at the start of graph is normal because the turbo doesn't have enough exhaust fumes and spools up as rpm rise. Your concern is the overboost. If the turbo is original, then it should be set right and problem could be with n75 or vacuum lines.

I'm pretty sure the stutter and sluggish performance are both related to fueling. That would explain why remap didn't help much. Could be injectors being partially blocked or although you said the timing is bang on 0, your car might need fine adjustment. When was fuel filter changed?

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Thanks for that, according to service book the fuel filter got done July 2012 at 56k, now done 91k. That was before I bought it, and if that is not correct in the service book then it has never had one. When the lap top was on it, the injector readings appeared to be very good and even across all four, I could start by getting the fuel filter changed just in case then take it to a specialist to work out why it is over boosting.

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This is probably unconnected, but the car has also an annoying loud drone at around 2300 to 2500 revs, which I thought was an exhaust issue, but it's been looked at twice now and nothing obvious wrong with exhaust, was planning a bit more work on car to try and sort it, and maybe put a request on here for advice about it, because i had read threads about a possible drive shaft issue on some cars, but just wondered if the over boosting was connected because it's in that rev range??

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Well, that was interesting. New fuel filter went in today, asked the garage if they thought the old one had done 35k or 91k miles. The response: it looks like it has done a million miles. I was shown it, it was full of oil, really choked. Not sure now if the service book is inaccurate and its a 91k filter, or there is an oil in fuel problem, leaking injector?? Going to run it for a month and check the filter again.

 

Finally got the blanking plate fitted in the egr valve as well, although not sure its necessary now, the egr delete has already been done. Is there any point putting one in if its no longer operating??

 

It still seems to drive pretty much the same after the above. Will maybe try and get some checks done to see if there is an issue with turbo or n75 or something else.

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if remap doesn't make difference...well your turbo is most likely dead.

 

standard turbo test is flat road...3rd gear let it drop to 1500rpm and then floor it...turbo suppose to start kick in around 1850rpm and dead after 2200

 

sticky vanes, lots of oil by intercooler. Lots of oil consumption. Leaking manifold. Vacuum hose leaking. Stuck actuator and so on.

 

How old car is? 

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car is 06, 91k miles, going to try another turbo log to see if its changed, but most likely I will book it in to someone knowledgeable to work through all the possible causes and take it from there, thanks.

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  • 2 weeks later...

Okay, had the car looked at. Good news is the droning was the propshaft damper needing replaced, that's on the way.

 

Not so good, been told it appears to drive fine. No fault codes. Pulls okay. Only thing is turbo was noticeably noisy, bit of a wailing siren type noise. Been told it will get noisier and will eventually need replaced, but could soldier on for ages.

 

Showed the graph with the overboost, been told this is probably due to the stage 1 remap that was done, and therefore the issue is with the map. I don't really understand that. If the map changes the turbo boost in some way, and there is a bit of overboost, should I be getting better performance, more power etc???

 

Bit confused really, not sure what to do next. Plan to speak to the lad who did the remap.

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