grahamc

iTrader: (10)

Was reading through a mag and saw the Subaru WRC induction system, basically it replaces the TMIC, which looks VERY cool!!! Any done a conversion like this on a road car?


ignore the red circle, just a pic I "borrowed"

TonyBurns

iTrader: (3)

If you can spend 100k on an engine then its worth the effort, most people cant afford a 600k grp A WRC car though so as they run about 320bhp but silly ammounts of torque, we just stick with the standard road setup

Tony

grahamc

iTrader: (10)

I get that they spend silly money on the engines, car, gearbox, etc.

But I am considering doing a fair bit of work on my cars engine and since the turbo, intercooler and induction systems are all changing - was just wondering if it had been done on a road car.

TonyBurns

iTrader: (3)

Well the grp N cars stick with a pretty standard system, even when spending alot of cash you cannot beat the standard air duct or if you go over 400bhp, a cold air induction kit in the wing.

Tony

grahamc

iTrader: (10)

Yeah, I figured the induction kit in the wing would be the way to go, but figured if it had been done, it would be cool to go for.

Splitpin

I'm not sure exactly what your question is here, what exactly do you mean by "it"? If you're asking about the induction and airfilter arrangement on those
pics you've posted, it makes sense to do it that way due to the turbo being laid back at a very extreme angle that can't be replicated on a roadcar turbos, so the opportunity to replicate it is limited whether with a standard position or rotated unit.

Under these circumstances you'd be better off running the induction in the normal position in the offside wing/flitch area - which is, in fact, where most Impreza WRCs (bar the S6 and S12b) have it.

From a technical point of view, there's no such thing as "cool". It's been done on that car because it works in that application. If you're building a roadcar, the same considerations and constraints do not apply.

grahamc

iTrader: (10)

Yes, I get that its been done for a specific application, rallying... the question is, "has it (the cold air induction system) been done on a road car". If it had been done, I would prefer to use this setup on my car instead of the generic "filter in the wing" option.

Splitpin

Unless someone pops up to say otherwise, I'd say probably not. As above the repositioned turbo on the WRC cars is the key to making that "filter in bonnet scoop" arrangement work. With the turbo in its normal or rotated position you would end up with a very inefficient (if not impossibly) tight right-angle bend immediately prior to the compressor intake.

scoobiewrx555

You'd have to have a special uppipe and downpipe made to run a turbo like that. Not impossible but bloody expensive and all the other mods to compliement the whole thing. Might actually be cheaper in the end to buy an old ex-works car

Limited to c.300bhp, no MAF sensor and full working ALS, all run on the std ECU. Awesome!!

grahamc

iTrader: (10)

now thats pretty much the answer I was looking for. I did not realise the turbo was in such a different position.

thanks

Splitpin

A lot more expensive than that, as you'd also need a turbo with a lubrication system capable of working properly in that canted back position. Regular gravity return turbo oil systems only work properly when the shaft is horizontal (or within a couple of degrees of it).

Again WRC runs the laid back turbo orientation because it has advantages re. exhaust manifold design and packaging, and, most significantly, centre of gravity. When you're competing in that arena the gains represent time on stage and are worth the cost. However, in a roadcar application it just doesn't justify the expense to try and replicate it.