Supercharger - how long can it run constant?

[Blown86]

Constant is no problem. What kills the toyota chargers is running them too fast for a long time. (over 12000rpm or so).

The SC12 can run 11 to 12,000 rpm, a 1ggze s/c (SC14) should be limited to max revs of about 9,000 rpm if you want it to last.

[Earlyrolla]

The SC12 can run 11 to 12,000 rpm, a 1ggze s/c (SC14) should be limited to max revs of about 9,000 rpm if you want it to last.

Why would the maximum RPM of the SC14 be that much different to the SC12?

The roots supercharger effciency has dropped off pretty badly by that RPM so it is not worth running it there anyway!

Provided that the temperature of the supercharger can be stabilised then there shouldnt be a problem. Hopefully you dont plan to run it constantly anywhere near 12000RPM. Yes, it will get hot! Compressing air does that... Not running the bypass will increase the restriction in the intake track at low loads, even if you plan to run the SC constantly. This will cause extra heating of the intake air but it shouldn't cause over heating of the SC!

Like everyone else has said, just run a decent intercooler.

[Hen]

Why would the maximum RPM of the SC14 be that much different to the SC12?

I second that question. The SC14 is basically identical to an SC12, just a shade longer. So I don't see why such a big change in max RPM would occur. However, as usual, I'll happily be shown to be wrong.

Hen

[crostek]

I second that question. The SC14 is basically identical to an SC12, just a shade longer. So I don't see why such a big change in max RPM would occur. However, as usual, I'll happily be shown to be wrong.

Hen

Both the SC12 and SC14 have extruded rotors in them which when pulled apart they look like a figure 8 when viewed end on, as you rev the charger higher the rotors elongate and the ends rub harder against the body, wearing the Teflon off. As the SC14 is a bit longer than the SC12 the force on the rotors is greater and there is more chance that the rotors will flex to much and lock with each other, (have done this to mine on the RA40GT)

[Earlyrolla]

Both the SC12 and SC14 have extruded rotors in them which when pulled apart they look like a figure 8 when viewed end on, as you rev the charger higher the rotors elongate and the ends rub harder against the body, wearing the Teflon off. As the SC14 is a bit longer than the SC12 the force on the rotors is greater and there is more chance that the rotors will flex to much and lock with each other, (have done this to mine on the RA40GT)

If the rotors are the same diameter and have the same mass versus centre of rotation profile, i.e. so the only difference is the length of the rotor then the centripetal force experienced by any part of the rotor at a given radii will be the same. I.e. the elongation effect you are talking about should be the same if only the length of the rotor is different and all other parameters are constant.

Note: I have never had a SC12 and a SC14 rotor side by side so I cant say this is the case with them.

[crostek]

sorry about the crap drawing but this will explain thing a bit easier.

[Hen]

Crostek, that cross section is identical for SC12 and SC14. The 14 is just a little longer in the dimension that isn't shown. So the 14 lobes would be **slightly** more prone to bending if unbalanced, however that effect would be absolutely minimal.

I totally agree with Earlyrolla above, but just couldn't be arsed getting into the explanation.

Hen

[highiq]

I converted my 1GGZE supercharger setup from magnetic to constant on and reduced the size by 18% at the same time....no problems there.

[Sprinter-Saurus]

If you're going to be doing heaps of beach driving, regarding TurboRA28's original question, how about one of the 3L Diesel motors, they are 3 litres in size, and the engine code is also 3L, but get one of the motors that came out with a turbo already strapped on, like the motors that came in the turbo-diesel versions of the Hilux, like the one below.



Would be perfect for beach driving, I'm actually looking to buy that exact vehicle above for towing and a bit of sand tom-foolery lol.

[TurboRA28]

How hard is it to fit a diesel engine to a petrol car?

I always thought diesel engines were very $$$$ also.

[Toy77]

Joel,

you are being soft.. just fit the 1uz that you really want - then worry about the blower later.

cheers
Stew

[TurboRA28]

Mate that is very true.. Just i've been scared off of how hard/expensive these babies are to fit.. With custom bellhousings and flywheels and sumps etc..

The 1G engines with a mid/rear sump are sounding too easy

[highiq]

Mate that is very true.. Just i've been scared off of how hard/expensive these babies are to fit.. With custom bellhousings and flywheels and sumps etc..

The 1G engines with a mid/rear sump are sounding too easy

..Which reminds me...I have my one for sale complete with a Wolf 3D Series 4 & wiring loom, and also a 3" exhaust system to suit an RA40 celica

[RAd28]

i'm with you there joel, wonder what the range of diesels are like... i'm gonna end up getting a lux of sorts eventually, but no way i could leave it stock engined... just wouldn't feel right.

1UZ just wouldn't be worth it for a bush basher, but a 1G-GZE just may be. though i'd be inclined to go diesel for a fourbie

[TurboRA28]

highhig, what do you have for sale? a 1g or 1uz?