The great big MK6 Golf 118TSI tuning thread

[The_Hawk]

Has anyone put a catch can into the 118tsi and have some advice/guide pics on the install and/or what parts they used?

[Mk R]

Awesome guide huh. I've not set up a catch can on mine.

[VW Convert]

I stumbled across this thread in another forum (see the source at the bottom) and wanted to share. There is actually a number of good posts over there by this guy that are worth reading:
SEAT Cupra.net - SEAT Forum

Some great reading there, very in depth, the sad conclusion however is that the 1.4 twincharger is a fundamentally flawed design.

Interesting that he writes "1.4TSI engine is actually based on the old 1.4 16v engine from years ago" when describing the issue of fuel injectors extinguishing the flame due to positioning of the spark plugs relative to the injector. I wasn't aware of this and can't help but think how good this engine could have been if it had been designed from scratch rather than being based on an old engine.

Cheers

George

[Greg Roles]

Catch cans on the TSI's are tricky as you have both a pressure and vaccuum PCV system due to the pressure difference across the throttle, hard to plumb in just one catch can to the two systems. I've had a few people try it over the years, and they have chosen one system to run, so they at least halve the gunk. Another option is two cans. Diesles just run vac all the time with a pre turbo inlet, they are always working at WOT throttle wise.

I reckon a bit of thought and some decent ( Provent ) one way valves you could do it. It is indeed very hard to find proper one way PCV valves though.

[Mk R]

It's disappointing they have so many issues but there's so many of them that the parts are pretty cheap. I've certainly poured way more into repairs on a previous Prado D4D and WRX than I have into the 118TSI. If i got another 50,000km out of the current CAVD block I have I wouldn't be fazed dropping another couple of grand to switch in a CTHD centre block and keep it rolling as a second car. It's way too much fun to drive to consider selling for what they fetch these days.

[Rawcpoppa]

Yup I'm keeping mine. So far no major issues. 113k km so far. I'm keeping mine and plan to get a miata. Looking to go stage 2 this year as well.

[rygreen93]

Got my TUNE!!!

So stoked on it as well. . But I would like to explain everything first so that we don't get any keyboard warriors here haha

So to start with. All these figures are at the wheels. So by using a crank to wheel HP guestimator (Wheel Horsepower to Crankshaft Horsepower Guestimator this is a breakdown comparison.

Our car comes with 118kW at the crank from the factory. My car being around 60k km's I would have expected close to 5-10kW power loss. Using the guestimator you get around 100kW at the front wheels. My car dyno'd stock (with my custom intake) at 101kW at the wheels and 247Nm of torque, this is at 4700rpm and 2100rpm respectively.

The APR stage 1 tune claims 155kW at the crank which equates to around 132kW at the wheels and 320Nm. I am actually not sure how crank torque converts to wheel torque so I cant exactly compare APR in terms of wheel torque.

What I ended up with from the boys at Harding Performance:

Max power at the wheels is 121kW @ 5500rpm and 282Nm @ 2300rpm. As you can see the graph of the before dyno looks nothing like the APR before graph. This is because they smooth out the dyno. Our engines naturally produce a peaky output. The total power is around 10kW less than what APR claims but you could almost attribute this to the fact that it was 30 degrees today.

Anyways all in all the tune is amazing. The car pulls so much harder than it did before and the torque is across the whole rev range. Where the car used to noticeably start losing power around 4500rpm it now starts pulling like crazy at that exact point. Honestly even after you guys telling me how big the difference is I am still shocked.

Anyways have a look at the dyno graph and let me know what you all think.
Note the data points on this graph show the rpm with the greatest gains.

[rygreen93]

By the way.I am happy to be corrected about anything I just said

[Rawcpoppa]

Stage 1 is great fun. Congrats!

[Ryan_R]

Congrats and enjoy the extra killer wasps responsibly

[ope126]

That is awesome. I would be keen to catch up one time and experience it for myself!

[rygreen93]

Where are you from OPE?

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[Mk R]

That's awesome! So glad you love it! It just goes bananas above 4000 RPM.

Be careful though... It's like crack. One moment you're enjoying your APR stage 1, next minute you'll be Googling the Loba 270 hybrid.

FYI: if in the future you feel as though your power seems to have faded away check your N75 and N249 valves. They're cheap to replace anyway.

[rygreen93]

That's awesome! So glad you love it! It just goes bananas above 4000 RPM.

Be careful though... It's like crack. One moment you're enjoying your APR stage 1, next minute you'll be Googling the Loba 270 hybrid.

FYI: if in the future you feel as though your power seems to have faded away check your N75 and N249 valves. They're cheap to replace anyway.

Thanks Mk R

Do I need a VCDS cable and licence to do that?

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[Mk R]

Thanks Mk R

Do I need a VCDS cable and licence to do that?

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I'm not sure to be honest, i don't have VCDS, i just asked my local mechanic to test it. He's got one. You'll know about it if it happens.