Club G40 Forum
Technical => Engine and Transmission => Topic started by: jimmyb1982 on September 29, 2010, 08:06:24 pm
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A crazy friend of mine is on about turboing his NZ. I've told him to do the following first:
- High flow panel filter
- 51mm TB butterfly
- GT top end
- 4 branch manifold and stainless steel exhaust system
- NZ remap
What would he need on top of that to run a small low blow turbo. I've heard the MK4 Polo has a metal head gasket which could be used to space the head? What about management, injectors, cam and sensors - would he need G40 items for that?
Its a crazy idea I know but what do you guys think he will need and what is the smallest sized turbo avaliable?
- Jimmy B
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not worth the agro!
it would be much cheaper and more reliable to use a g40 engine, they are designed to handle boost!
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I thought it might be lol.
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NZ already has a decent size throttle as it is two plates likes a gt. Not sure swapping the head would give any gains either, putting the cam in should get a gt-spec head. They are lower CR than a gt so mint get away with a bit more boost. A mk4gasket will raise CR a bit though so I'd leave the standard one in.
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I'm currently gathering the parts for an AAV turbo which is basically the same bare engine as the NZ, just with SPI instead of MPI injection. Same 9.5:1 compression.
Have a look here:
http://www.polog40.co.uk/forum/index.php/topic,4708.0.html
For a rough foundation.
I'm going down the K03 route, because it's tried, tested, relatively cheap and there are lots of parts available. It'll run G40 management with a chip from PPP to start with, probably a custom remap once I'm comfortable with a boost figure - starting around 5-7psi on recommendation from the forum. I'm sure at some point the boost will be increased incrementally until something pops - to find the limit. Hopefully it'll just be the head gasket.
However...when you add it up you're not saving much by keeping the NZ/AAV over a G40 conversion minus the charger.