Discussion
Hi all, im kinda new here..
Im kicking an idea about for a turbo mk2 golf. The VW 8v engines all seem to be very smilar castings so i have 2 possible ideas
A) strap a turbo diesel exhaust manifold to my old driver lump, bodge up some turbo piping and see what happens or
B) use a diesel block with a petrol head (Gti possibly) and use the td exhaust madifold that way. My main concern is what will happen to my timing, compressions and mixture. i can get a very thin sandwich plate made to fit with a head gasket to lower the compression a bit but im not quite sure of what route to take. Any ideas or any1 done this conversion??
Dan
Im kicking an idea about for a turbo mk2 golf. The VW 8v engines all seem to be very smilar castings so i have 2 possible ideas
A) strap a turbo diesel exhaust manifold to my old driver lump, bodge up some turbo piping and see what happens or
B) use a diesel block with a petrol head (Gti possibly) and use the td exhaust madifold that way. My main concern is what will happen to my timing, compressions and mixture. i can get a very thin sandwich plate made to fit with a head gasket to lower the compression a bit but im not quite sure of what route to take. Any ideas or any1 done this conversion??
Dan
Hi Dan. Yes ive done a turbo conversion on the 8valver but its in a Mk1.
I think youll find the TD manifold a bit on the restricted side, far batter to get one for the job. Try Stealth Racing in Southam as they do a lot of this kind of work.
The sandwich plate to drop the CR is a bit of a no brainer to be honest mate, as the best way is to use Audi quattro pistons from the MB code quattro 10 valve engine. Itll fit straight onto the existing rods, and the bore diameters will fall into line with all the VW variants( whats YOUR engine code btw?) and will drop the cr to 8.8:1 from 10.1:1.
Having said that, you can still run boost on the engine as it stands, but itll limit the boost you can get away with using without an intercooler.
The diesel block idea is a good one, as is using the diesel crank, rods and main bearings. The GTi head will fit onto the diesel block, but youll need to check the compression heights with the pistons fitted and make sure you have at least 50 thou clearance at tdc, or otherwise the pistons may touch the head at high rpm....(not a good thing!
)
If youre determined to go the mix and match route( and why not! ) then dont use a diesel turbo unit as its not up to the heat generated by a petrol engine and will cause you grief, you can use a t3 unit from an Rs turbo, as its almost within the size rating for that engine.
Dont forget, there's also an oil feed needed with a restrictor in line, to drop the oil pressure to around 30 psi, and a good 1/2 inch diameter drain down tube will need to be plumbed into the sump from the turbo, preferably as vertically as you can get, although 45 degrees is acceptable.
Have you considered the fuel system?
If not, youll need to get injectors from a G60 golf or corrado and also the engine management to run it, Digifant 1.
Mine should be capable of around 300bhp(give or take) once its been mapped for the new injectors im using, but as a taster of what itll do on standard injectors, as fitted to GTi golfs, mine will spin both the wheels in third on a dry road without use of the clutch and just by prodding the "more speed" pedal a bit harder.
Also, dont forget that the standard 020 5 speed box is only good for around 150 bhp, so if you exceed its ratings itll go pop sooner or later. Also the clutch will need some work, as will the brakes, after all, its ok getting up to speed, but hell its no fun if you cant stop!
HTH, if you need any more help feel free to ask.
I think youll find the TD manifold a bit on the restricted side, far batter to get one for the job. Try Stealth Racing in Southam as they do a lot of this kind of work.
The sandwich plate to drop the CR is a bit of a no brainer to be honest mate, as the best way is to use Audi quattro pistons from the MB code quattro 10 valve engine. Itll fit straight onto the existing rods, and the bore diameters will fall into line with all the VW variants( whats YOUR engine code btw?) and will drop the cr to 8.8:1 from 10.1:1.
Having said that, you can still run boost on the engine as it stands, but itll limit the boost you can get away with using without an intercooler.
The diesel block idea is a good one, as is using the diesel crank, rods and main bearings. The GTi head will fit onto the diesel block, but youll need to check the compression heights with the pistons fitted and make sure you have at least 50 thou clearance at tdc, or otherwise the pistons may touch the head at high rpm....(not a good thing!
) If youre determined to go the mix and match route( and why not! ) then dont use a diesel turbo unit as its not up to the heat generated by a petrol engine and will cause you grief, you can use a t3 unit from an Rs turbo, as its almost within the size rating for that engine.
Dont forget, there's also an oil feed needed with a restrictor in line, to drop the oil pressure to around 30 psi, and a good 1/2 inch diameter drain down tube will need to be plumbed into the sump from the turbo, preferably as vertically as you can get, although 45 degrees is acceptable.
Have you considered the fuel system?
If not, youll need to get injectors from a G60 golf or corrado and also the engine management to run it, Digifant 1.
Mine should be capable of around 300bhp(give or take) once its been mapped for the new injectors im using, but as a taster of what itll do on standard injectors, as fitted to GTi golfs, mine will spin both the wheels in third on a dry road without use of the clutch and just by prodding the "more speed" pedal a bit harder.
Also, dont forget that the standard 020 5 speed box is only good for around 150 bhp, so if you exceed its ratings itll go pop sooner or later. Also the clutch will need some work, as will the brakes, after all, its ok getting up to speed, but hell its no fun if you cant stop!
HTH, if you need any more help feel free to ask.
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