springsracer88

i am looking into buying a supercharger soon... and i am just wondering which 1 i should buy for my 91 N/A... (yes i searched and after looking thru the first 3 pages with no result i gave up) thanx

SonicRaT

iTrader: (6)

Unless you feel like custom making everything to do it, you're pretty much SOL. The camden kit isn't worth the effort, and at the moment there are no other kits available.

springsracer88

so if you were me....(and i want either to supercharge ot turbo my car) what would u do?


(btw....the kit that you ar making....when will it be ready?)

springsracer88

so if you were me....(and i want either to supercharge ot turbo my car) what would u do?


(btw....the kit that you ar making....when will it be ready?)

PureSephiroth

he'd do both obviously.

There was a thread a long while ago about fitting a T-bird supercharger on an NA FC. Search for that, you might find what you're looking for.

classicauto

iTrader: (3)

turbo it

bingoboy

the tbird eaton m90 doesn't flow enough air for the 13b.

SonicRaT

iTrader: (6)

It does, just not for much power.

I've done both, turbo and supercharger already. And in all honesty, I'll say unless you've got 4k+ to dump, a turbo is the better bet. Check the thread for kit status.

Jezzder

use the eaton supercharger off a jaguar xjr... and i am all with you on the supercharger bit... i dont really like the whole turbo idea...

really what you want is a positve displacement supercharger.... that will pump enough down there....

SonicRaT

iTrader: (6)

An eaton m112 still isn't good enough for much of anything. They're so innefficient at low boost and expensive to install it's not worth the effort.

BrianVFR

SonicRat, are you saying that the 13B breathes more than a 5 liter piston engine? I can't figure out how to calculate total CFM on this twin triangle thingy!

SonicRaT

iTrader: (6)

I'm saying that the eatons are inefficient over 8-10psi of boost unless you port the **** out of the charger and put every single peice of hardware you can find (custom plenums/air-water intercooler/etc), and they're STILL not very good at high boost. So, you figure in it's volumetric efficiency, then you figure it's adiabatic, and then you look at the max boost you can squeeze out of it without creating some insane heat, and you'll find on a rotary it doesn't do much good. The thing about it on a 5liter, is it can move air for 8psi, but still be somewhat 'ok' in efficiency because it's not actually *over* 8psi and forcing air back through the blades and so forth, where-as with a rotary, we require not much air, so we hit 8psi pretty easily while moving a rather small ammount of air, but the more you force feed it, the more inefficient that charger becomes.

I generally size things around a 2.6L to go with the rotary.

BrianVFR

So, would it be better to go with a twin-screw type, like the AutoRotor that I put on the 928?

bingoboy

we got an M90 on a six port engine and rev'd the snot out of it and it's making 5lbs of boost running off of the crank pully that runs the water pump/alt with a serpentine belt. this is with the smallest pulley you can get on the M90. as compared to their webpage i think we've already run the M90 out of the rpm range listed for their specs on cfm/boost etc.

RoadRaceJosh

I would have to say so. For those in the US Whipple is the place. Roots type blowers are just that, blowers. They have no internal compression so they are pretty inefficient. The Lysholm types, like the Whipple, are internal compression superchargers and are much more efficient. A good centrifugal compressor like you find bolted to an exhaust turbine can be more efficient, but you don't get the broad boost range of the Lysholm compressor. The only thing I know of that came to the US with a Lysholm compressor was the Mazda Millennia S.

SonicRaT

iTrader: (6)

Yes, a twin-screw is better, though rather costly.