Cleaned the side mount intercooler, got some ideas...

[Preen59]

All very interesting. Great write up mate. Just wish it had pics! Everyone loves pics.



Now that the Caddy is out of warranty, i've been thinking about what i can do to it.. Boost referenced water/methanol injection is on the cards....

[Buller_Scott]

cheers guys!

water meth..... awesome!!! although before i get even thinking about that, i'd have to replace my cute little turbo with the pd150 one at least!

as for the pics, preeny, i'll get under the car soonish because i want to size up the tools i'll need to remove the intake manifold and give it a thorough clean, see if i can get at the egr motor for a bit of a clean too, so i will take some pics just for reference

and yeah, josh- how much are they? count me in. egr deletion would be sweeeeeeeet.

[Preen59]

PB150? Is it a bolt-on improvement?

[Buller_Scott]

yeah preeny- it's the turbo from the gt tdi 2.0 125kw golf.

im not sure what turbo comes in the caddy, though, because the caddy's the 77kw pumpe duse engine iirc. but either way, it's supposed to be a case of easy-swap with some pipework, between the 74kw, 77kw, 103kw, and 125kw TDI's. i'll have to some pics of my turbo setup and compare them with pics of whats for sale on the net, though, to see if the similarities lend themselves to swappability.

but yeah, it should be bolt on, according to what i have gathered so far. i think it goes something like this:

polo tdi borg warner bv39:


golf gt tdi garrett gt1749vb:


there IS one in between, which is the pd130 turbo that went in the south african polo tdi sportlines [96kw] and a few other cars, but apparently they had a tendency to go boom, and they ended up doing a recall in ZA.

the pd150/ gt tdi turbo is supposed to be a bolt on mod, just need new intake piping, at least a bigger smic, i'd want a maf-less and egr less tune, new downpipe etc.

i'm really seriously considering this as my next turbo as it's apparently reliable, proven, will get the polo up around the 190hp mark, and from what i can gather, costs only a couple hundred bucks more than the stock replacement. probably less, if you were to import it from overseas vs getting it at VWA spare parts.

[Greg Roles]

Don't want to be a stickler, but it's a 1749vC baby. VB is in the 103 TDI. Fair bit different actually.

[Buller_Scott]

Don't want to be a stickler, but it's a 1749vC baby. VB is in the 103 TDI. Fair bit different actually.

oops! gotta do my homework.on tdiclub lots of the guys are happy with the VB, i had always presumed it was from the pd150- but look what presumptions get you! but then again, there are a few different turbos that, on tdiclub, have different ''street names'' to their actual names. e.g. the garrett gt 1749v label covering stock sized turbos, and also being used as a nickname for the borg warner BV39 and the KKK KP39.

they SHOULD be direct bolt ons, from what i know, preeny.... people are using the same bolt on upgrades, be they mk3 golfs, 9n3 polos, skoda fabias, etc etc.

frigging rain. rain rain rain. i wanted to get under the car and have a look around, take some pics. but of course its gotta rain. hopefully this arvo.....

[Greg Roles]

Yanks only get the 103kw TDI in their jetta's, thus all they know is the VB. Once they finally get the 125kw engine, they'll be playing with the VC. My only question in retrofitting the VB/VC would be how to run the VNT mechanism, as this is one of the key differences between the two, with the VC having a more complex control mechanism to allow much finer control. The VC has a different inlet housing, not sure on the impeller. I believe the exhaust is quite similar, but it's hard to find out much at all, I've sure spent many hours searching!

A bigger turbo is going to give you crappier down low by the way....I for one am not interested in making an even narrower powerband!!

[Buller_Scott]

hmmmm.... well, that's true. i was hoping that the fact that the gtd [aka gt tdi] turbo would still have little lag as it's a VNT, but you make a pretty damn good argument.

on the cards is deffo a straight through intake, maf grid removal, larger pipework.

but then i've gotta address front swaybar, coilies, all the bushes, and hopefully eventually clutch and maybe even lsd for go-round-corners-better radness. although people might laugh @ an lsd on a car as underpowered as a polo tdi... who knows...

had the thought of bigger turbo crossed your mind seriously, cog? or rather, optimisation of all on-board systems, with a little extra [e.g. dpf delete + water meth]?

[Greg Roles]

Nope. A bigger turbo that flows more air will inherently have greater lag. It's why manufacturers have twin turbos, to avoid the drivability issues for high power factory turbo cars. The turbo in the GT already flows a lot of hp for a diesel stock, and it has that big turbo rush as it comes on song, any bigger would just aggrevate that point, unless you got lucky and matched up something better than VW did. And you can bet they trialled a LOT of turbo's, something a normal person can't do. I'd look to the UK to see what the polo TDI guys are doing over there, as there may indeed be a bigger VNT turbo off another VW such as the GT that does still give a "full" powerband, but in my case, no, I can't see any reason to go bigger when close to 200 hp and crazy torks seems very available on the stock turbo.

Having said that, turbo and injectors are the usual limiting factors in any diesel, so long as flow in and exhaust out are optimal.

So yes, i'm going option two mate!

[GoLfMan]

Im also looking into a Turbo upgrade. But I'm undecided as to which one. I'm thinking the GT turbo would be the best option, as I have a goal of 120kwatw+.

I was thinking a GT2260VK but this would give me almost nothing below 2500, which would just be pointless in city traffic.

Scotty, where are you finding these turbo's? Im coming up to the 100k mark and Im just hoping like hell my turbo doesn't give up the ghost anytime soon!