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Supercharging the 9N Polo
Posted: Wed May 05, 2004 9:21 am
by woter324
Ok then guys. How do we do this one. Any kits out there? what are these things on eBay any good or as cheap as they look?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 76399&rd=1
http://cgi.ebay.co.uk/ws/eBayISAPI.dll? ... 76412&rd=1
One of them I checked out the site. The tacky appearance didn't do anything to boost my confidence:
http://www.kamann-autosport.com/Start2.htm
Some intersting kits for VW's generaly here:
http://www.nsracing.com/vw/turbo.htm
Anyone know a place that may be able to supercharge the 1.4 16V 9N Polo.
Many thanks[/url]
Posted: Wed May 05, 2004 11:07 am
by Joy
A Polo has got a high compression (10,5:1). Without adjustments to the engine to lower that compression I garantee you that the engine will blow.
A friend of mine had a Volkswagen Lupo 1.4 16V 75 HP. He added a turbocharger which boosted the poweroutput to 120 HP.
After 2500 miles the engine stopped working. A look under the bonnet revealed a huge crack in the lower part of the engine. It was just torn apart.
So, to make a turbocharger work you should lower compression first.
Compresion change?
Posted: Wed May 05, 2004 11:12 am
by woter324
Thanks for info,
Do you know if the compression can be changed electronically, via ECU or in another funky way?
Thanks
Posted: Wed May 05, 2004 11:32 am
by Joy
The "supercharger" you are reffering to isn't the same as a conventional turbocharger of course.
The advert promises a lot. But I'm very suspicious. The price is even lower than a 57i kit from K&N.
10,5:1 is nearly the perfect compression to detonate fuel.
When adding a turbo the compression will rise to >15.
So you have to lower the mechanical (10,5:1) compression to make some room for the pressure delivered by the turbo.
This can be done by mounting a metal headgasket sealed by 2 normal headgaskets on both sides of the metal one.
The best way to lower that compression is to install new welded pistons with a smaller bore. But that's very expensive.
Re: Compresion change?
Posted: Wed May 05, 2004 2:44 pm
by dxg
woter324 wrote:Thanks for info,
Do you know if the compression can be changed electronically, via ECU or in another funky way?
Thanks
I'm by no means an expert, but I understand that a thicker (or a couple of standard ones) head gasket is a bodge that will achieve this.
I've seen the calculations you do to work the CR's out and they scare me!
Deek.