Hi or low comp???

I am still waying up all the options and i must say that the supercharger does sound good.
Has anyone gone this route up til now?
Can you supply the charger?

Thinking more into the possible setup,surely you would have to go onto the crank pulley due to the timing chain setup!!??

For me this route sounds more appealing the more i think about it!No need to get new manifolds fabricated,no need to buy another uprated turbocharger and no need to uprate the engine,(Although i still like the idea of 3 litres)!!!

Obviously your ecu/injectors will be ok for this route??

Yes, supplying a charger wouldnt be a problem, and Id have a new pully fabricated from scratch.

Id still recommend decent manifolds as standard atmo ones are restrictive at 160bhp, let alone with forced induction, and the turbo manifolds are worse than that...

Engine is already setup for forced induction, just add the ecu and injectors.

Unfortunately i don't know anything about superchargers,only what they do,time to learn some more!!!
From a quick glance on ebay there seems to be two types??One that goes directly onto the inlet and one that will sit alongside the engine-chez VW??

Which type would you supply/rough cost?

As for the manifolds,would it be a complete refab or how about your twin turbo items??

Unfortunately i don't know anything about superchargers,only what they do,time to learn some more!!!
From a quick glance on ebay there seems to be two types??One that goes directly onto the inlet and one that will sit alongside the engine-chez VW??

Which type would you supply/rough cost?

As for the manifolds,would it be a complete refab or how about your twin turbo items??

You can still mount a screw type one along side the enigne, so it can be intercooled. It requires a new duct to come from the base with a tradional round output, which you can then attach the CC to, and then to the plenum.

The smaller centrifugal units don't make the same low end boost as the screw type(unless geared up correctly), but are much smaller and will still make a very good setup. Easier to mount too...

Manifold wise, just go for the 3 into 1 GTA manifolds and rear silencer, as per the atmo. Fine for the job. Ill work out some figures.

From the little i have read about the screw types,i tink that would be the best to go for.
I'm glad i can still use the CC seeing as though i have only just bought it!

Please PM me with prices when you get the chance.

[stephendell]

I've gone for one of these:

http://www.rotrex.com/

Notice they are now partners with Jackson. Jackson used to be advocates of the screw type but have now gone centrifugal.

Here's what they have to say why:

The new Rotrex supercharger combines the throttle response of the Roots supercharger with the compressor efficiency of a turbo, but without the lag. And the Rotrex does this without noise, without oil lines connected to the engine, and without the heat common in turbo applications. With boost capabilities of over 20psi we can address any special needs you might have in a custom application.

Thanks for the info Stephen,looks interesting.

How far off are you to getting it up and running?
Could you please give me some idea of the cost for the unit.

I think Stephen will tell you that it's "not a rush job".

Shame. It would be nice to get a head start!!!

[stephendell]

I think Stephen will tell you that it's "not a rush job"

Definately not a priority although I have most of the parts now.

The basic supercharger kit is approx £1100 for the charger, catch tank, oil way plumbing and priming pump.

To fit to an atmo you also need:

Turbo inlet manifold complete with throttle body and fuel rails
Mounting bracket for charger.
Bigger injectors.
ECU
Injection pump
Anti surge tank/Swirl pot.
Inter/charge cooler
Double crank pulley
Oil cooler
Hoses!

+ a few other bits I've probably forgotten

Less required if you are starting with an injection engine.

It's a bolt on kit though as the standard atmo compression ratio is perfect (apparently!)

Only thing is I was going to stick to the oddfire 12V until Rupert's post reminded me of the extra potential of the 24V

Do you think i you can get away with 'non sodium valves' with the supercharger setup,given the reduced intake temps??

The 24v setup does sound appealing but i have heard that the rocker setup isn't great on reliability!!

Do you think i you can get away with 'non sodium valves' with the supercharger setup,given the reduced intake temps??

The 24v setup does sound appealing but i have heard that the rocker setup isn't great on reliability!!

Its not to do with the intake temps, as its more or less the same on a decent turbo/sc setup, its the fact that on a turbo car, the EGTs are much higher due to the exhaust manifold pressure etc..

Hence why its worth having a decent exhaust system, so maybe you won't need sodium valves, but with them you can run more power, more advance etc.. FYI, Clio 16vs run sodium valves and they are naturally aspirated...

1 of of 10 24v engines will be ok, unfortunatly there were only about 9 ever made...

Ok,so basically there's no point in me using Z7W heads due to the valve size and being non sodium!!??

Just out of interest what comp due you think will be the best for the supercharger route. I am now thinking using the 73mm crank,with 91mm turbo pistons and heads - not sure what that works out to be yet!

When you PM me with the other prices could you also give me a price on a set of Z7U pistons please.

Ok,so basically there's no point in me using Z7W heads due to the valve size and being non sodium!!??

Just out of interest what comp due you think will be the best for the supercharger route. I am now thinking using the 73mm crank,with 91mm turbo pistons and heads - not sure what that works out to be yet!

When you PM me with the other prices could you also give me a price on a set of Z7U pistons please.

Your confusing me now . What actual engine have you got a Z7W or a Z7X?

Can't use 'turbo' pistons on the 73mm crank unless you go for forged and they would need to made specially.

Why not just use the straight Z7W engine, and supercharge that?

I have a spare Z7W engine that i got from Lee.
The main reason i was thinking of interchanging was because of the valves!

If i could use the Z7W as it is then that would be fine by me.
I take it this means i could use the standard oil pump??

Hold on let me backtrack...

I first advised you not to raise the comp run less boost etc, because I thought you were trying to go for more power than we are currently getting on GTA turbo's by a different way of tuning...

If you are quite happy with say 230bhp, and want no lag, ie good low end response....if you have a whole Z7W why not put your turbo kit on it as it is (id put a larger turbine housing on the turbo though) and run a low boost setting with a new ECU...?

The only modification you would have to do, would be to lose the mechanical water pump and run an electric unit, so you can rotate the inlet manifold round 180 degrees. A bit of jiggling around with the chargecooler position and its not that tricky...