super charging 18RGEU

[dale30]

.............length.......... width....... height........ weight........ displacement
SC14.....311mm ......148mm ....254mm ........11.9kg ........1420cc
SC12.....249mm ......148mm.... 254mm ........10.8kg ........1200cc


regards
jon

I assume that the length is including the pully, If so its a sc14.

[MWP]

1G-GTE's are 8.5:1, and everyone safely raise the boost on the stock turbos to 15 psi.
Id say 12 psi on 8.3:1 is still cruzn.

Its head and chamber design that make the difference there.
Remeber the 18R-G is a lot older than a 1G-G.

Also remeber that the max recommended RPM for a SC14 is 10,000 RPM.
Since your doing speedway (ie, constant high revs) you would want to stay a decent amount below this to make sure you dont kill the SC.

[dale30]

Its head and chamber design that make the difference there.
Remeber the 18R-G is a lot older than a 1G-G.

Also remeber that the max recommended RPM for a SC14 is 10,000 RPM.
Since your doing speedway (ie, constant high revs) you would want to stay a decent amount below this to make sure you dont kill the SC.

Cool
i will have to work out pully sizes and figureout how fast its spinning at 7000rpm
Unless someone allready knows.?

crank pully=557mm circ
s/c pully =381mm

[dale30]

mmm if my maths is right that will have the sc14 spinng at about 12000...

i need to come back to 1:1 ratio to be safe..

Is 7-7500 constant ok for sc14?

[Norbie]

That should be fine.

Keep in mind that you won't get a whole lot of boost at a 1:1 drive ratio though. The SC14 will displace 1.4 litres per revolution, while the engine consumes 1 litre per revolution. That means a boost of approximately 40%, which should translate to roughly 6psi.

[WindeX]

That should be fine.

Keep in mind that you won't get a whole lot of boost at a 1:1 drive ratio though. The SC14 will displace 1.4 litres per revolution, while the engine consumes 1 litre per revolution. That means a boost of approximately 40%, which should translate to roughly 6psi.

Thats a very useful piece of info there. Does anyone know of a pully that is very close to 1:1 for the SC14(for my 3sge)

[Norbie]

You'll probably need a custom crank pulley for a 3S-GE, so you can specify any ratio you choose.

OTOH if you want to adapt a factory pulley, I'm pretty sure they're all setup to overdrive the blower.

[dale30]

That should be fine.

Keep in mind that you won't get a whole lot of boost at a 1:1 drive ratio though. The SC14 will displace 1.4 litres per revolution, while the engine consumes 1 litre per revolution. That means a boost of approximately 40%, which should translate to roughly 6psi.

What is the max safe rpm for the sc14.

[jonra23]

Most commonly quoted number i have heard is 11,000 rpm, seems to vary between 10k to 12k depends who you talk to.

regards
jon

[dale30]

Can anyone guess what sort of hp this stock RGEU with 350 holly, 98ron pump fuel and 6psi boost might get to in round figures.?

educated guess will do.

[ace]

180hp?????

[Norbie]

My guess would be around 180hp. Pretty hard to say though, that's not exactly a common setup!

[pilot]

This is incorrect. Compressing air (or indeed any gas) increases its temperature. This is equally the case for turbochargers and superchargers, given the same boost levels.

OTOH if you're running methanol you don't have to worry too much about that. I'm thinking the 8.3:1 compression ratio might be a little low for methanol though, unless you crank the boost up to buggery?

On a centrifugal compressor (like a turbocharger) the quantity of heat depends on its efficiency at the dessired conditions. If you have 2 turbochargers, one big and one small feeding the same engine, the air charge at say, 1 kg/cm^2, will be at different temperatures at the compresor exit.

I guess something similar would happen on superchargers and it will be related to its efficiency in relation to air flow and pressure.

[dale30]

Just a thought here.
Bearing in mind that this thing is for speedway so its just wot from about 4000 to 7500.

My main sponsor is a large wrecking yard up here on the coast and i have total access to it.!! drool boys...lol

There is a complete 22re in a rt142? there.

Could i use all the bits from that to get my EFI working.?
t/body,afm,ecu etc..
big Injectors are no problem v6commo, tr magna etc:

Is this a fisable idea or are the22re system to different.

we have just fitted a early vn commo loom and ecu to the 2005 alloy tech quad cam commo motor no probs.

[Norbie]

On a centrifugal compressor (like a turbocharger) the quantity of heat depends on its efficiency at the dessired conditions.

It's true that the adiabatic efficiency of a compressor has an effect on how much the air is heated up, but this is a second-order effect; the majority of the temperature increase comes from simply compressing the air.