Rotrex pulley/restrictor info

[plees]

I'm after abit of confirmation regarding rotrex pulley sizes and restrictors. I've had a look through old threads but not I'm not 100%

I've bought a second hand c30-94 k-tec charger kit to fit to my engine which has 197 cams. I've bought a slightly bigger 90mm pulley for the charger to slow it down a little. The kit comes with a restrictor before the inlet at the the air filter which measures 35mm ID

So, with that pulley and restrictor size, will I still be able make 250bhp? or will I need a different sized restrictor? I've got ARP rod bolts to so I can be revved if needed

Cheers

 

[HarvB]

Not ideal with 35mm - that's the same size as WRC, and even with their mega resources they "only" manage ~300hp.

 

[plees]

That's the original restrictor that came with the k-tec kit I think though!

 

[marinemackay2003]

It depends on where you are putting it, in the charger inlet or intercooler inlet

 

[plees]

The one I have fits in the end of the inlet hose before the filter @marinemackay2003

 

[marinemackay2003]

Keep it in the inlet imo

35mm should be around .5 bar of boost so maybe 230-240 bhp

@Cub. is using similar iirc

 

[Cub.]

Op - mine is a similar set up, mapped at 249 bhp and 220lb ft at RS Tuning.

 

[plees]

Cheers. It'll probably be worth me making up say a 37mm one then I'm guessing, just incase the 35 doesn't reach 250 @marinemackay2003

Do you know what size yours is @Cub. ?

 

[marinemackay2003]

I would go up in mm increments tbh as they are fairly sensitive so maybe a 34 and a 36 if you can do them yourself

 

[Roblake]

I would go up in mm increments tbh as they are fairly sensitive so maybe a 34 and a 36 if you can do them yourself

The one I have fits in the end of the inlet hose before the filter @marinemackay2003

Hi there did you ever complete the build ,and what results did you get ? ,I am trying to do the same with a 197 but am struggling to get info on pulley sizes and restrictors etc, I am not sure when you look at the graphs for the Rotrex if you size the pulley to get the maximum speed of the supercharger or whether you size it to give you the speed at which you get the point on the graph for the required kg/sec output?

 

[bloke]

run a wastegate on the inlet just before the body.