Very easy fix is to pour a packet of curry powder in the radiator. The curry will circulate until it finds a hole where it will bake into a plug. Don't ask me why it works or how, we drove a A14 for almost a year like that, after a welsh plug sprung a leak, before we pulled the motor to rebuild it.

I'm sure it's not, but it sounds very similar to valve bounce.

Have a look here.

http://www.ihi-turbo.com/turbo_RHE-RHF.htm

I recently got my hands on an IHI off a 3.0L Isuzu diesel. It's the RHF5 series, I'm sure these little buggers would do an excellent job on a standard A12-14. You get larger and smaller versions in the RHF5 series giving up to 208hp, with the RHF55 ones being slightly larger delivering up to 277hp. These figures are around 0.65bar gate pressure, so if you crank it a bit they should give a bunch more. They are ballbearing types and very reliable too.

They should also be plentyful with you guys having all the Isuzu, Ford, Mazda and other diesels that use them.

Obviously they wouldn't be suitable for suck through, but a good source of cheap turbos if you run blow through or injection.

If anything, just uprating the springs might cost you some power as they are now more difficult to actuate. Also fit a reprofiled cam otherwise there is no point.

Yes, the S2000 ones are different, but the ones in the previous pictures are the same. They don't have injector bosses, just a piece that bolts on the front which adds injector bosses.

Not saying it's not a good price, just saying they are probably made by the same people...

The throttle bodies themselves look exactly like the ones from a 20V 4AGE engine. Might be an option to try and find a set of those, but they would probably be the same price.

EDIT: And the Toyota ones also come in 43 and 46mm.

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What he said was - Hold my beer while I show you this trick.
What he meant was - I hope your insurance is up to date.

Or probably how it normally turns out...

What he said was - Hold my beer while I show you this trick.
What he meant was - Hold my beer while I show you this trick AND don't drink it you wanker...

LOL, from ZA here, but you guys make me laugh sometimes... *tumbs up*

We got power differences of around 3kw when the standard fan is on or not, the belt driven pump mounted one that is. When replacing it with an electric fan and racing you are mostly moving fast enough to keep the motor cool enough that it will never need the electric fan, so you score a lot by doing that.