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Turbo Mini Forums

Top man......much appreciated.

Right. Pulley is 106mm outside diameter. I am running a carb version. But cant help but think it would be easier for you to swap belts etc around than get a pulley custom made. Like I said before I am seeing 8psi on my bosst guage. My charger is still on its standard pulley. My bottom pulley has a single poly v for my altenator and waterpump and a 5rib belt for the charger. Hope that helps

Cheers for that lockfast, My water pump and alternator are also driven by the rib belt as my engine is an mpi so its probably easier to stick with these. Do you run any form of recirc pipe from the charger outlet back to the inlet side?

Your drive ratio must be 1.63:1 whereas mine is 1.77:1 which would explain why im getting higher boost pressure and charge temps.

Will hve a play on the rotrex selector now and see what i can summate.

You need an N2O kit, fitted with a sensor so that when it hits a certain temp, the system is injected to lower the temps. Seen the kits for water injection and it works.

Lightweight racer coming soon.

I would have thought that injecting water before the charger will only increase the errosion on the rotors?

Fast Carl can machine up pullies, dont know if he has done multi rib belt pullies, but i cant see it being a problem to a man who can make anything.

I still think anything other than intercoling is avoiding the real problem.

The problem of intercooling is what you have to resolve.

Do you have any dimensional drawings for the compressor discharge. I could draw up an adapter on CAD to give you an idea of why you are looking for.

Is there any room above the charger at all, could you not raise the back of the bonnet just a little to allow the charger to sit a little higher?

Hi Sprocket, Yeah i would be perfectly happy raising the bonnet a little or even going to a CF bonnet which could sit slightly higher. I will have a look on the Eaton website now as im pretty sure there are dimensional drawings on there. I would like some form of intercooler as that would be the best long term solution.

Jonspeed can also make the pulleys to suit individual applications so i might give them a quick buzz and find the cost of out for one as well. Will also PM carl. Cheers for the help

I think JK has already said this, but in the V8 world blowers are a direct bolt on to the manifold with little scope for chargecooling. They do have a spacer now that slips between the charger and the manifold that can be plumbed in as a chargecooler.



May not be much use scaled down to A series level but hey!

Just spoke to Stu at vmax who has explained a few things to me that now make sense. Im going to try out one of his chargecooler conversions as its simple to use, costs less than any of the other methods and quick to install. I will keep you guys informed of the temperature differences before and after fitment. If this doesnt provide enough of a drop then Stu can make me a bigger pulley to slow things down and drop the boost.

Whilst bowing to Stu's engineering superiority and experience.....

Doing a bit more of a shed job.... I imagine you will be running a bit less than 12.5:1 AFR. If you richened it up a bit, you would have the added bonus of the dHv of the fuel, as well as less recirculation by the rotors and approaching the "right levels" of reactants (stoicheometrically correct) you should get a bit more welly.

This is a lot cheaper than ferking around with expensive stuff.

If you want to ferk around like that, get the blower at the front and intercool it, as well as blowing through. From memory, the M45 map is acceptable to about 12psi (not ideal, but OK). It produces an amount of heat you can lose.

Talking of wearing rotors out, Eaton specify that the rotors are not compatible with fuel......

Anyway, just my 4p

Edit:- Ignore me, I've just realised that you're running injection.

Edited by Hedgemonkey on 21st Apr, 2009.

Bugger off, I'm getting there.

Andy what did you go with? How did the charge cooler go?

the manifold used on the SC12 setup must be rife for a charge cooling.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!