Strange Behaviour

[pinkgti]

Got feedback from the tuner and they've said colour is "normal" for a polished stainless exhaust - but definitely won't be pushing it and will get it checked out.

Thanks everyone. Will let you know how it goes.

[pinkgti]

Here's the "full" explanation:

"This discolouration is normal….What it shows is the Dump Pipe and Cat Converter functioning properly.

It highlights that you have good / unrestricted flow throughout the Dump Pipe. If it discolours in sections or stops after the cat converter, it would indicate that you have a restriction in the dump pipe / exhaust somewhere.

The discolouration is also highlighted due to the fully polished finish, the heat changes the colour of the stainless steel. In a painted system this is not visable.

From the images, I can say that the dump pipe is working correctly."

Though there's definitely an issue with the tune - just less concerned about the exhaust now (apart from being the wrong size for max gains that is!).

[pinkgti]

Update - car is booked in with tuner in 2 weeks for a new exhaust, tune and a few other bits.

Fingers crossed it all gets sorted. Will post some new logs once the it's complete.

[parso_rex]

Does the ECU have to come out of the car each time ?

[pinkgti]

Does the ECU have to come out of the car each time ?

In my particular case it is due to Bosch encryption. I believe this may not necessarily be the case will all Mk6 GTI's though.

It must have been that they added encryption with the pink paint option or something.

[parso_rex]

They aren't encrypted.
They may be doing it this way (via BDM) to apply their own OBDII read blocking though, some places here do this.

In my particular case it is due to Bosch encryption. I believe this may not necessarily be the case will all Mk6 GTI's though.

It must have been that they added encryption with the pink paint option or something.

[Guy_H]

Who is the tuner? as above with Parso, no MK6 GTI that is delivered in AU needs the ECU pulled out, and blocking the OBD stops VW putting any updates on the car.

[pinkgti]

Well this little pink GTI does need to get bench tuned - and understand that 99.99% of Australian delivered Mk 6 GTI's probably don't.

Bench or OBD port tuning aside I'm still trying to understand what effect having a tune file for a 3" DP being flashed into an ECU/car that only has a 2.5" DP installed.

[Guy_H]

There is some technical discussion here : Downpipe solutions, what did you get? - VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com - it refers to the later TSI (timing chain) motor, but you see that a lot transfers over to FSI motors as well.

You should look closely at your projected EGT's - doing this at steady state type log (easy on a dyno to hold load) you will see results quicker than single dyno power pulls or quick street blasts. It's obviously these things which are directly associated with the component protection modes (stops melting your turbo & blowing your engine) that should be looked at closely if you are unsure about your tune.

[pinkgti]

There is some technical discussion here : Downpipe solutions, what did you get? - VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com - it refers to the later TSI (timing chain) motor, but you see that a lot transfers over to FSI motors as well.

You should look closely at your projected EGT's - doing this at steady state type log (easy on a dyno to hold load) you will see results quicker than single dyno power pulls or quick street blasts. It's obviously these things which are directly associated with the component protection modes (stops melting your turbo & blowing your engine) that should be looked at closely if you are unsure about your tune.

Thanks Guy - interesting read on DPs. My take-out is that you really need a tune file to suit the size DP if you want to generate maximum power/torque and if you do this then the 3" is the way to go. Still not sure what having a tune file for a 3" DP is going to have when a 2.5" is installed. I think from the thread the answer would be you'd theoretically be able to work itou t but in reality you'd have to do some real world testing.

OK so next questions is how to measure EGT's. Is this data/parameters available on EA888 engine/ECU? i.e. can I log it with Vagcom or does this require an RTD/thermocouple up the tailpipe? Unfortunately I don't have access to a dyno in my driveway, so is it possible to run some meaningful tests or at very least check temps out of the turbo and make sure it's not going too high.

I want to know if the tune has done any damage to my car before things get changed and swept under the carpet.

Are there any parameters that I can log and values that you'd expect under "normal" operation plus limits that you'd recommend not to shorten engine life.