Superchargers

[Dod]

I'm looking at the idea of Supercharging my GSi Carlton (I know, not a Nova but this is the best place for info) but my knowledge of them is limited.

They're belt driven but do they need to be turned at a certain RPM? How do I now what Supercharger to go for and whats involved in fitting them?

[let_nova]

pm genralbaxter he supercharged the nova

[Benn]

Talk to JohnnyA hes doing something like it and knows the score on Carltons and chargers.

[Dod]

I dont think its been done on a CIH yet which is why I want to fin d out more about them before I start into how th fit them etc.

[Mike]

Dont need to spin at a certain RPM, as there belt driven (as you know) the size of the charger pulley will effect how high/low it spins on idle & also how fast it spins up.

Obviously smaller better = tres better

[General Baxter]

the size of the charger pulley will effect how high/low it spins on idle & also how fast it spins up.

Obviously smaller better = tres better

yeah mini puts out 12psi at 7000rpm

why am i putting out 10 at 800 lol

[burgo]

yeah mini puts out 12psi at 7000rpm

why am i putting out 10 at 800 lolcos your a goon and just bolted it on instead of doing a few calculations to work out what size pulleys you want

[General Baxter]

**** that, id put a small one on if i could lol

[Jack]

Dont need to spin at a certain RPM, as there belt driven (as you know) the size of the charger pulley will effect how high/low it spins on idle & also how fast it spins up.

Obviously smaller better = tres better
Too small and it won't flow enough. I wanted to buy baxters but it would severely restrict my V6 :(

[General Baxter]

Too small and it won't flow enough. I wanted to buy baxters but it would severely restrict my V6 :(

stick two on then lol

[burgo]

Too small and it won't flow enough. I wanted to buy baxters but it would severely restrict my V6 :(plus you would be trying to spin it faster than its designed to

[General Baxter]

plus you would be trying to spin it faster than its designed to

bah if they explode i can get new ones for £170 lol

[burgo]

its not it exploding baxter. supercharging are designed to work betweem a certain rpm like turbos. and the further you go from this the more inefficient they become

[General Baxter]

of course it will explode its me lol

[burgo]

hence why no one should do this


pm genralbaxter he supercharged the nova

[Dod]

Thats all very nice everyone but its not really helping me.

So they're designed to wor at a certain RPM, they basicially force air into the engine yeah? So obviously theres an inlet required, if so, where does it connect to?

[Jack]

Dod, think of it like a turbocharger, except it doesn't sit on the exhaust

[Dod]

So where does it sit and how do you figure out how big or small a pulley you need?

[General Baxter]

So where does it sit and how do you figure out how big or small a pulley you need?

take some advise,

hammer weld grind hammer some more, **** it, lets go lol

[LiquidPug]

Thats all very nice everyone but its not really helping me.

So they're designed to wor at a certain RPM, they basicially force air into the engine yeah? So obviously theres an inlet required, if so, where does it connect to?
You can use the standard inlet, the pipework from the supercharger via the charge cooler/intercooler can attach straight to the throttle body.

Changing the crank/charger pulley size will affect the boost pressure, but the charger will have a RPM redline which will be dependent upon model/type used.

To work out the boost of the application your using, you can use the following equation (pulley ratio is between crank pulley and charger pulley) but this doesn't take into account any losses in the system.

http://www.kennebell.net/accessories/pulleys_puller/formula.gif

[Dod]

Liquidpug, by far the most useful post in the thread. Than you.

[Stuart]

thats only of use for displacement S/C's (ie hEatons)

if you consider a rotrex type (centrifugal) then it will be similar to specing a turbo but just taking into account the pulley speeds.
I have a spreadsheet somewhere that can calculate the centrifugal type infos

[Sloth]

rotrex do 3 main sizes. the smallest is for upto 2.0 the next upto 3.5 and the next upto 5.0. theyre extremey good but expensive. i did think of cutting a turbo in half and attaching a pully......

[Stuart]

rotrex do 3 main sizes. the smallest is for upto 2.0 the next upto 3.5 and the next upto 5.0. theyre extremey good but expensive. i did think of cutting a turbo in half and attaching a pully......


the small one isnt much cop on a 2.0 as its at its limit doing anything worthwhile.

the middle one is about right for a 2.0-2.5ish application.

and the big one is good for anything funky like a 2.5 or up.

gearboxes that small but that speed and power level are somewhat expensive to make ;) its calculated that with the medium sized one on a 2.2 4pot making 250bhp its using 20bhp of power to compress the air (compared to 30-40bhp for a similar spec hEaton lol)

[Sloth]

google gmc 6-71...... win.

[Stuart]

google gmc 6-71...... win.

pffft too inefficient at higher boost :p

[Edd]

I spoke to the guys at Gmc bout my Rotrex, on my x16xe they recomended the c30-84, just had to measure the bottom pulley and they sorted the charger pulley out. Xe injectors 1.1 rising fpr, sorted.

[General Baxter]

Xe injectors 1.1 rising fpr, sorted.

thats all im running, but a 1.1.7 reg

[Dod]

Ok, this is coming thic and fast now, happy days. Anyone care to give guidence on whats the better option for my 3.0 Carlton?

Also, I feed the compressed air from the SC though the throttle body or directly into the inlet? HAs anyone got a pic I can study up on?

[Stuart]

you can set it up how ever you fancy.. The rotrex site has suggestions and reasons as to why/where you mount the TB in relation to the S/C

[Dod]

Thank you all folks!