It took me a morning to take it all out, the only problems being worn splines on the driveshaft bolts and rusted exhaust manifold nuts. Since I wasn't going to be reusing then I just snapped them off. It was raining cats and dogs so I invested in a Tesco garden table cover and attatched it to the garage door and bonnet to keep the worst of the weather off.
While I had space to work in I changed the brake master cylinder for a 22mm item, ever since I fitted the larger 16v calipers the brake pedal has had a bit of travel before it bit so this should cure that problem. The 2 line pipework had to be changed to 4 line, M10x1 brake pipe adaptors were used to join the existing pipes.
Since the turbo engine will be producing a lot more heat than the 8v one I used some heatsheild matting to protect the steering gaitor, wiring and bulkhead.
I tidied up the engine bay wiring as a lot of the insulation had decomposed and fitted the mk3 flywheel and clutch to the engine. When I tried to fit the gearbox mount I discovered the mk2 mount does not fit the mk3 box so decided to fit the old gearbox to the engine for the time being, however it is unlikely the box will last very long... To save on the cost of an engine crane I made a frame to support the engine on a jack so I could wheel it straight in - it worked very well and with new uprated mounts fitted I slotted the engine into place.
Then it was simply refitting all the bits I'd taken off including the rod change gear linkage, speedo drive, heater matrix pipes (just use the 20v ones), accelerator and clutch cables (a 1.3 carb acc cable fits nicely). Some part than need a bit of work are the fuel lines - just run some new 8mm hose from the stock hard lines to the engine making sure you get the feed and return the right way round! I used a length of hose to join the 8v servo hose to a section of the 20v one - Use the correct type of hose, if it colapses under vacuum you'll have no brakes. Also t'eed into a manifold vac hose for the MFA vacuum, ran the coilpack wiring up to where the ECU was situated (may change its location), connected the wastegate pipe and cobbled together some coolant hoses. I used sections of scrapyard hoses and bought some hose joiners from think auto which did the job. Its still a little untidy but I'll scour the scrappers for some hoses that fit. I also refitted the PAS system, perhaps the biggest surprise was that the Mk2 PAS pump fits straight onto the Mk4 bracket and the Mk4 pulley fits it! Result.
I then fitted the driveshafts and filled up the oil in the engine and box. I have used the stock radiator against all advice (the hose fittings are on the wrong end) but it fits really well with a slimline fan. Although the new engine was the same capacity as the old one the extra 12 valves made space a premium. Even with the slimline fan room is very tight and this was before I got the intercooler on which made it even worse!
Then it was a case of plumbing the IC to the throttle body and turbo. I uses some of the 20v hoses and pipes (cut and welded) and some more scrapyard stuff (Vauxhall Vivaro I think) aswell as some exhaust tubing of the correct diameter, I will probably tidy this up in the near future with some Samco type hoses and nice polished aluminium pipes. I also made an exhaust downpipe, its in mild steel and only took a couple of hours to knock up. This is mated to the stock gti exhaust to make it a real sleeper. Don't forget to use a flexible joint in the exhaust - it will probably snap if you leave it out.
The biggest problem area with the exhaust it just after it exits the turbo - it needs to take a sharp turn to avoid the steering knuckle.
Finally got the fuses fitted in the car and wired up to MS, the O2 sensor, coil etc. Be prepared to pull the dashboard to bits to get at all the wiring!
Made an air filter bracket to support the new green cotton filter. I will look at either fitting this where the washer bottle sits or using some sort of cold air feed in the future.
Installed a vacuum hose from the MFA to MS, the oil t piece finally arrived (M10x1from demon tweeks) and I fitted this along with the 2 oil senders (high and low pressure) into where the standard oil sensor fits.
The Mk4 alternator was wired up - use the blue wire from the 4 pin plug and connect to the blue wire near the battery, connect the thick red wire straight to the positive terminal of the battery. And fitted a throttle stop screw as I wasn't using the idle control - this would allow me to get a decent idle speed.
