Set up needs for a blow through SC - newbie questions
Turbo Mini Forums

Hi

Darryl here - slowly planning and part collecting for a blow through SC - running through a carb

I Have a square nose leyland.
Either am going to build a 1100 to suit or use a current 1275 well built but to NA specs currently running 9.75 CR but either change head or add decomp plate to get CR to mid to low 8s. It will run less than 12psi boost.

I have ....
sc12 toyota SC (not the best or most efficient but i now have it and it was cheap)
pulleys, idller, bracket for a front mount and a bracket to lower the alternator out of way
also have intercooler, hif 44 turbo carb, standard hif 44 manifold, metro turbo plenum

The design .. loosely .... should look something like this...(apologies for not being able to credit this picture, lost its origin, thank you moke owner)




Now questions

1.Blow off or bypass valve - i have a bailey(single) BOV running off plenum -

I would need to recirculate this- where and what size should it plumb to - will it be big enough etc

2.heating, cooling, icing, i live in tropical queensland - should i hook up manifold, what about anything else?

3. fuel regulator and fuel system in general ATM i have a facet electric pump flows 3-5 only and i don't have any recirc back to tank. what is needed


Thanks for input

1. Either between the air filter and charger, or straight to free air.

2. Normal mini coolant system plumbing should take care off it. Wouldn't bother with the heated manifold.

3. You need an efi spec pump and a rising rate fuel pressure regulator referenced from the plenum. Same principle as a turbo engine. Plenty of examples on here.

Thanks apbellamy , regulator and rising rate pump - i'll have a look at the fuel flow set ups and then see if i have more questions Cheers

Okay a bit more research now done. would a 3 bar fuel pump be suited (rather than 4 or 5) and in rising tate regulators the ratio of 1:1 - so basically i could have a system that runs on 3psi on idle no boost and then it would run at 10psi on 7pounds boost? - is it a concern to have a pump with base pressure at 30 pounds - (eg bosch 044)

Edited by Earwax on 19th Apr, 2013.

That pic is of Pete's moke:


That supercharger is an Aisin AMR300 running about 4psi on a 998 motor.

There is a guy on Ausmini (Ben) who makes & sells mounting kits for the SC12, definately the way to go over making your own from scratch. Use google to search - Ausmini's search function is broken & won't find anything.

thanks awd - i am going blow through , i thought bens was only suck through - judging by the threads i have seen

Edited by Sprocket on 19th Apr, 2013.

thanks sprocket - i will look out for a malpassi rising rate 1:1 regulator. i see lots of 'standard efi type fuel pumps and i take your point about overkill but wouldn't the ideal 'matched' fuel pump only need say 3lbs to 20lbs at full boost?? not the 30 stock pressure of most efi????

If you use any high pressure fuel injection pump, it will work perfectly fine at 3psi or 20psi under boost.

Pumps are rated with fuel flow at nominal supply pressure. Pressure alone does not tell you haw much fuel the pump will flow.

a pump rated at 150 Litres/Second at 3bar, will likey flow far far more fuel (L/S) at 0.3 bar.

Remember what I said, it is the regulator that sets the fuel pressure, not the pump. A high pressure fuel injection pump will be perfectly happy running at 0.3bar or 1.3 bar even though it is rated for 3 bar

Don't wory about it

ok thanks again sprocket cheers