118TSi - CAVD to CTHD conversion, wiring harness Q? HELP!

[Mk R]

Being a little further away it may have a bit of delay in the reading but when you really put the boot in at 3,000 RPM+ the needle shoots up to 15-20 PSI quick smart.

I have the dial and needle set on red and it flashes to white at 22 PSI so you can see the boost peak without taking your eyes off the road.

[highflyer1]

Hi Hawk,

I took one look at that boost piping system and went straight to my mechanic before i made a dogs breakfast out of it. I'd be happy to to post some photos and ask them for you though. I recall even they had issues capturing the + and - boost readings properly.

My gauge now shows negative and positive readings on idle and boost respectively. Interestingly on start up when it runs like it has smokers cough for the first 30 seconds the pressure goes to zero before settling into -20.

On a side note, had my N75 replaced today after seeing the failure on the boost gauge at the 3500RPM switchover and boy does she boost hard on turbo again!

A few days back on the road and engine warning light is on. Checked codes and it is overboosting. With WOT it struggles past 4k, and every now and then it goes into limp mode until I restart. if I apply throttle gently, it holds boost OK but it's not a smooth boost "curve". Kinda jerks a little. I might get the GFB DV+, and a new N75 valve. In the mean time I will have to drive it like I'm driving Miss Daisy around....

Once these issues are ironed out it's straight to the shop for an APR tune and the podi you mentioned!

Other than that - she's purrrrrrrrrring along nicely

[Mk R]

A few days back on the road and engine warning light is on. Checked codes and it is overboosting. With WOT it struggles past 4k, and every now and then it goes into limp mode until I restart. if I apply throttle gently, it holds boost OK but it's not a smooth boost "curve". Kinda jerks a little. I might get the GFB DV+, and a new N75 valve. In the mean time I will have to drive it like I'm driving Miss Daisy around....

Once these issues are ironed out it's straight to the shop for an APR tune and the podi you mentioned!

Other than that - she's purrrrrrrrrring along nicely

Maybe have a good look at the turbo and see if everything's working ok. There seems to be a ton of stories out there about actuator issues and turbine vane damage causing that sort of thing, mostly in diesels though.

[highflyer1]

Yep, definitely crossed my mind to check the actuator and vanes. The turbo came with the engine as a complete unit with 9k on the clock. To think that it could be sticking with such low millage is a concern, albeit the engine was pulled out for a good 25 weeks or so....

One question tho...

The pipe coming out of the intake circled in the pic... where does this go to? What does it do? It wasn't in the original engine (CAVD) but is on the new one. I was getting an intake leak error code until I swapped out the intake pipe to delete the said pipe...

[Mk R]

Yep, definitely crossed my mind to check the actuator and vanes. The turbo came with the engine as a complete unit with 9k on the clock. To think that it could be sticking with such low millage is a concern, albeit the engine was pulled out for a good 25 weeks or so....

One question tho...

The pipe coming out of the intake circled in the pic... where does this go to? What does it do? It wasn't in the original engine (CAVD) but is on the new one. I was getting an intake leak error code until I swapped out the intake pipe to delete the said pipe...

No idea. Partsbase.org might have some answers for you...

[rygreen93]

Maybe have a good look at the turbo and see if everything's working ok. There seems to be a ton of stories out there about actuator issues and turbine vane damage causing that sort of thing, mostly in diesels though.

Hi Highflyer1,

I hope you get notifications for this.

I am in the same situation you were a while ago and need to do a swap and want to go CTHD.

Please can you PM me or send me an email on rygreen93@gmail.com so I can have a chat with you and the issues you faced.

I would really appreciate your experience.

Thanks
Ryan

[ope126]

Hi Highflyer1,

I hope you get notifications for this.

I am in the same situation you were a while ago and need to do a swap and want to go CTHD.

Please can you PM me or send me an email on rygreen93@gmail.com so I can have a chat with you and the issues you faced.

I would really appreciate your experience.

Thanks
Ryan

Ryan,

Did you get your car sorted mate?

[Waz]

Hi are you able to provide me with your mechanics details. I have the same problem, 2010 tsi golf that has done 57,000 needs a new engine.

[Saabg]

What about swapping everything over from your old motor onto a newer motor before installing it. Wouldn't that negate the need for a new ecu etc?

[abhinesh]

Changing from CAVD to CTHD engine

Hi All, Sorry for the lack of replies from my end, I wasn't notified of replies, plus... I've been flatout swapping the engine out.

I can confirm that the engine swap was very straight forward. There are some slight differences with vacuum lines (one which I'm trying to work through ATM). The original (CAVD) ECU seems to work with no issues with the CTHD engine.

The new engine runs beautifully, revs freely, no vibrations, and incredibly quiet inside. Only issue atm is the lack of clutch (It's in the workshop being fitted). Once that is done, blue slip, rego and back on the road.

I was fortunate enough to pick up the engine from the wreckers with the supercharger, turbo and wiring harness all hooked up. Made the install a breeze for a non mechanic. Can't say the same for the removal of the original. Being a n00b at it, I dismantled it bit by bit to disconnect the harness....

Anyways - lessons learnt. enjoyed the experience and can't wait to enjoy the twin charge. beasty little machine.

Once back on the road it will be an APR tune for performance, but also as a safety net.

Thanks All.

Hi Highflyer1,

How did it all go after the change from CAVD engine to the CTHD? Any issues later on?


To anyone else reading this, please feel free to assist/comment. Is it possible to change from CAVD engine to CTHD without much hassle? Or is it easier to do a rebuild? If rebuild, is it cheaper to get the parts from Europe? etc. Please help.

Abe

[PK23]

New here - more detail

Hi All I’m completely new to all this (VW and forums). I have recently acquired 2009 Golf 118TSI DSG with a motor that needs work. It would appear that irs just a head gasket, however I don’t have any history so I don’t know if the engine was cooked and or what other damage may have been done.

i am therefore thinking of swapping engines out as I don’t want to start a head gasket change and then find I need to change the head because to warped and the turbo also has issues or the pistons are shot.

It will I’ll be much easier to get a complete engine from wreckers and swap over so the change mentioned here is interesting as I can get a CTHD engine for the same price as a CAVD engine.

i therefore need to know what specifically needed changing and any issues I need to be aware of, no one seems to have clarified this specifically anywhere, except in the post below which is the closest I have seen, which mentions issues but not if and how they were addressed.

IF ANYONE CAN HELP I WOULD REALY APPRECIATE IT AND THANK YOU IN ADVANCE.

I would like like to do this swap this week as I have some time off.

Hi All, Sorry for the lack of replies from my end, I wasn't notified of replies, plus... I've been flatout swapping the engine out.

I can confirm that the engine swap was very straight forward. There are some slight differences with vacuum lines (one which I'm trying to work through ATM). The original (CAVD) ECU seems to work with no issues with the CTHD engine.

The new engine runs beautifully, revs freely, no vibrations, and incredibly quiet inside. Only issue atm is the lack of clutch (It's in the workshop being fitted). Once that is done, blue slip, rego and back on the road.

I was fortunate enough to pick up the engine from the wreckers with the supercharger, turbo and wiring harness all hooked up. Made the install a breeze for a non mechanic. Can't say the same for the removal of the original. Being a n00b at it, I dismantled it bit by bit to disconnect the harness....

Anyways - lessons learnt. enjoyed the experience and can't wait to enjoy the twin charge. beasty little machine.

Once back on the road it will be an APR tune for performance, but also as a safety net.

Thanks All.

[WIDGY]

Hi guys
I am also after information regarding swapping out a blown CAVD to a CTHD engine will the CTHD bolt up to my Auto?
my intention is to swap all bolt ons to the later engine if possible.
has this been done previously any info would be much appreciated thanks.