TSI squeal noise problem on acceleration

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Originally Posted by cktsi

So if you have a Vag-com (or access to one), have you tried other "hidden" settings? I read the thread in the Mk5 forum about the rain sensor being able to close windows & sunroof when it detects water (provided the wiper stalk is in the rain sensor mode position). Ever tried something like that one?

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Yep, I have seen that "rain close" option in the controller coding but it does not appeal to me so I have not activated it. (My guess is it is off by default in AUS for fear of cooking a child in a car in the tropics.) I changed some trivial stuff like the number of lane change courtesy flashes from 3 to 5. I am interested in the Distance Impulse number to tweak/correct the speedo but need to research it more first. Could be wrong but I gather correcting the speedo places and error in the ODO so it is not a good outcome. Anyway as you or someone else mentioned, 106 = 100kph. Yes there is a heap of stuff in there to tweak but one has to tread carefully. Main draw back I see with Vag-Com & our cars at the moment is poor support for the TSI118 Engine and DSG7 and ABS controllers. This will no doubt improve in time though. The other more common controllers like the instrument panel is well supported.

I was reading in those service pdfs logger recommended (ssp359) about the 118 twincharger and on page 50 it mentions that the supercharger will not work if the magnetic clutch fails.

I wonder if this has something to do with the plume of fuel. If the air is not compressed to the level that the fuel is supplied then an incomplete combustion and the excess heading out the tailpipe. Just speculating a bit.

Hey guys,
That noise is the small belt that drives the supercharger getting up to speed or slowing down.
I am probably going over things that some of you already know.
That belt is driven buy the water pump that has a clutch that is in close relations to the clutch on your older style A/C compressure. The differance is it is opperated by P.W.M. (pulse width modulation) What that does is brings the super charger up to speed without julting it harshly and the same with dissingaging it.
EVERY twin charge has this noise and will always have this noise. Some are a little quieter then others but they will all sound the same after about 50000k

Interestingly, I followed a brand new 118TSI down the freeway on Saturday as it belched black smoke under acceleration and squirted out a large amount of fluid out of both exhaust pipes. This does not look normal at all, nor does it look very 'appealing'... Should a brand new petrol car be doign this sort of thing?

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Originally Posted by coastie

I was reading in those service pdfs logger recommended (ssp359) about the 118 twincharger and on page 50 it mentions that the supercharger will not work if the magnetic clutch fails.

I wonder if this has something to do with the plume of fuel. If the air is not compressed to the level that the fuel is supplied then an incomplete combustion and the excess heading out the tailpipe. Just speculating a bit.

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Europe has the world best emission standard period! This car actually meets Euro 6 recommendations but its not out yet. If there was an emission problem with unburnt fuel for example then an engine light would 100% be lit up on your dash insert and DTC's would occur in your engine fault memory sayin there is such an issue

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Originally Posted by Tommy

Interestingly, I followed a brand new 118TSI down the freeway on Saturday as it belched black smoke under acceleration and squirted out a large amount of fluid out of both exhaust pipes. This does not look normal at all, nor does it look very 'appealing'... Should a brand new petrol car be doign this sort of thing?

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water is actually a byproduct of combustion after going through that cat co0nverter you probably seen that coming out of exhaust.

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Originally Posted by coastie

I was reading in those service pdfs logger recommended (ssp359) about the 118 twincharger and on page 50 it mentions that the supercharger will not work if the magnetic clutch fails.

I wonder if this has something to do with the plume of fuel. If the air is not compressed to the level that the fuel is supplied then an incomplete combustion and the excess heading out the tailpipe. Just speculating a bit.

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The clutch has a fail safe on it that if the supercharger fails or the clutch is not getting the P.W.M. (signal from the ecu) It has a return spring on it like a starter motor. this insures that if the supercharger fails it will not harm the motor and the same vise versa. It is a fail safe. It is a form of LIMP mode. If this happens the turbo will still work as if the supercharger was never there.
And the check engine light will come on.

Hey Dave, I realise you guys would have the proper VW VAG diagnostics machine so I am not sure if it gives you this info....but you wouldn't happen to know which VAG measuring Block the PWM signal gets sent to would you?

I can see the G583 sensor S/Charger pressure at Block 241,1 and was hoping to find the PWM signal in that region as well. Just that I would like to see how it behaves in VAG-COM. Observe the delay between Supercharge clutch commanded on and pressure increase in the manifold and so on.

Thnx.

To be honest with you the vag com has more info on what all the MVB are. As dealer you are only given usefull information. The PWM is changed so quickly the scan too l will not pick up on it. If an when there is a problem we use the DSO scope to messure the PWM. Not a MVB. If you email Ross-Tech they would be able to tell you the MVB that tells you when it is and or isnt ingaged.

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Originally Posted by v.w.dave

To be honest with you the vag com has more info on what all the MVB are. As dealer you are only given usefull information. The PWM is changed so quickly the scan too l will not pick up on it. If an when there is a problem we use the DSO scope to messure the PWM. Not a MVB. If you email Ross-Tech they would be able to tell you the MVB that tells you when it is and or isnt ingaged.

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Fair enough. You don't have the time to be stuffing around with the trivia when you have things that need fixing and established methods to do so, that work.
I have been doing some research and there is a certain amount missing from the Ross-Tech label files and what they know of the twincharger. But with a little bit of strategic fiddling I have managed to identify a couple blocks that are useful but were previously unknown to them. So far I have found G583 which is supercharger OUT manifold pressure and today I am fairly certain I found G584 which is the regulating flap position. Controlling Air into the supercharger. Its noisy little bugger by the way. Have not found the PWM yet, but will keep looking.