17 replies to this topic

[BoboGib]

but i cant seem time find one anywhere! so i guess astralian websites are probably the best to find one right

Aus Ebay, Aus mini's. There is also places like

Here and Here as well as a few other companies in aus.

I bought one of Ebay.Au just before christmas. Just a case of looking.

[apbellamy]

My SC12 charger came from ebay NZ. Postage costs are horendous.

Somebody on Turbominis is building a 1100 SC12 setup with a cam and a 12G295 head. He's hoping for arounf 100BHP at the flywheel.

A 998 should easily run 60-70BHP without really stressing it.

Personally, I have a 1275, stage 3 head, Vmax Scart 274 cam and am hoping for 120+ BHP at the flywheel if I ever finish the shell.

[Gr4h4m]

Q1 You can get over-fuelling on overrun as the air has shut off but you still have a fair amount of drag from the charger. You can run with either a 44 or 38. A few peole in AUS run the poppet valve from an old turbo carb.
Q2. Yes you can switch off the clutch, MJ can operate the clutch with the clutch off the engine will still run.. (The induction is still turning the charger). You can even drive the car with it off...
Q3. Its has a clutch as on the Toyota engine its only used at a certain manifold pressure before it boosts, I believe this is to help on over -run rather than idle, it has a by-pass valve that is used when the charger is off. Remember on the Toyota is before the fuel not after
Q4. MJ is a very good upgrade, Ben even does a kit thats compatible with the pulley, I never saw any increase in total power however I got better mid range and you know the timing it correct all of the time, (Lots of dizzys are badly worn).

I cant remember when the boost comes in buts its low on the rev band, it then builds to 5 psi very quickly and then from 5-10 psi at full chat.

I have had 60 BHP at the wheels, on a number of occasions, using a standard cam and standard 12G295. If you look at most of the rolling road shootouts in the mags there are lost of N/A 1275, 1330's and even a few 1380's either just hitting or missing that sort of power.
I have also had the sc12 kit on an old smoker of a 1275 for a very short period again with everything standard, and it made 72 ATW.

A Vmax cam and a ported head should give a bit of an improvement.

IMO it looks better under the engine than the Eaton.

Right here goes...

I like a few others have found that the Toyota SC12 charger is a good add on for the mini.

My set up with be a suck through... yeah I know, boooo! lol

I have a couple of questions:

I have seen some people cars with a 998 engine with SC12 using a 1 3/4" HIF44 carb BUT surely that will cause problems with overfueling at idle when the charger is hardly producing puff and also cause a headache with high rev and fully open throttel tuning?

Would a 1 1/2 HIF 38 not be more suited for the 998 running around 70bhp? could you even use the 1 1/2 HS4?

Second question:

The SC12 is clutched and I have seen others question the possibility of shutting down the charger for idle revs, will the charge allow air/Fuel mix to flow through whilst not spinning or will a bypass be needed?

Third Question is following on from question 2:

If the Unit cannot allow air/fuel mixture flow through without the unit charging/spinning , then why is it clutched? would it not be better to have a solid state wheel?
What revs does the charger start to produce boost over the top of the existing manifold vacumm from the engine? (the equalibrium). I question this as this is about 1800 ish on a turbo set up?

Forth and final question .... for now:

I have seen people talk about the megajot/squirt ignition timing set up etc but have seen great results with no more than a standard type distributor on 998 engines.
How necessary is it to replace a dizzy set up if you are not going to go into 100bhp plus figures?
I realise this will still need set up and attention and probably a mechanical advance instead of vacuum due to boost to stop piston melting?

Thanks

Edited by Gr4h4m, 20 January 2010 - 06:11 PM.