LT

I have gone through the FAQ and read up on what I could that pertain to what I am trying to do, but haven't really found anything close to what I'm trying to do.

I have a 1976 FJ40 Land Cruiser that is built for rock crawling. The engine I have is the basic straight 6, 257.9 CI that runs on propane. The compression ratio on the engine is stupid low 7.8:1 and propane is rated at 110 octane. I have a HEI distributor that is mechanical advance, and is advanced at 16* at idle currently. I can get away with such a large advance because of the high octane fuel and my low compression ratio, the engine still hasn't pinged on me.

I have been throwing around the idea of turbo for my 2f engine (straight 6) and have done some general research. Mostly I am finding information of 4cyl or 8cyl engines. The 2f engine is a very low revving engine that maxes out at 5000 rpm if I feel lucky, more like around 4000 - 4200 rpms. Then name of the game for me in what I do is low rpms with a ton of gear reduction. When I am in first gear with both transfer cases engaged I have a final gear ratio of 289:1, so I am not looking for some high horse power monster.

I am basically trying to find a turbo that will spool up pretty quickly (1500 - 2000rpms) and have my power band maxed completely out around 3000 - 3500 rpms or maybe a little more. I am leaning towards using a T3/T4 combo but I had a friend suggest using a 13b from an eagle talon. With my propane set up it is a basic system using a fuel lock off valve, a vaporizer and a mixer that puts the propane vapor into the intake. After talking to a propane guru I will need to use a drawn through turbo system. The propane mixer has a variable venturi which is nothing more than a diaphragm that opens and closes allowing more or less propane to flow through the system depending on how much vaccuum the engine is pulling. The entire propane system is under constant pressure from the propane tank so I do not have any fuel pumps of the sort. I have a self adjusting fuel management system basically and it allows me to run upside down if the occasion ever asks for it

I am curious what you guys would have to say with my application. If you have any questions or need any more information please let me know.

Holsquirt.

t3 super 60? I cant think of ny other propane engines so I am not sure what sort of exhaust characteristics it has.

Smith-02

you may or may not need to add fuel injectors into the setup. a 60/63 t3, a small t3/4 combo, or even a hx30 will work for you. that size on an engine, youll boost at idle almost, it's too small. 14b, 16g, sure.

propane is weird. ford propane 300's had a timing box, it changed timing. vac advance retards when it sees pressure, too

kamilk69

is that actually possible??

LT

I do not need fuel injectors with my set up. My engine originally had a carburetor on it and I converted to propane for the characteristics of fuel injections without the wiring. It is a very popular conversion for 4x4's since it is easy and simple to install. When the propane enters into the mixer it is a vapor so there is no liquid so to speak entering into the intake.

I was thinking for a quick spooling T3/T4 combo so I can have the bigger boost of the T4 but the quicker spooling capabilities of the T3. I will be making my own customer adapter plates so which ever turbo I go with is not a problem. There is one other Land Cruiser that has a drawn through propane set up and he is using a straight T4 set up and said he was making boost around 2000 rpms but had a ton of exhaust leaks in his system.

LilWayne

post pics of your truck and propane set up

LT

My build up thread

My Propane Set Up

The propane tech article had my old propane set up before it was stolen. I have a brand new set up using the same parts but it is brand new. The base plate is different as well using a solid aluminum base plate that is a large 1 barrel. The current mixer is rated at 345 cfm and I will be changing it out to a 425 cfm mixer for the turbo.

EG-prince

Thats a gangster FJ you've got there. Any idea how much money you have into it? But anyway, like was said already, a t3/t4 combo would give you the quick boost you needed. Also consider a smaller holset turbo like the hx30, the holsets are off of dodge diesel's and have been shown to be very efficient turbos, not to mention they are pretty cheap used versus a t3/t4. I'm a little confused as to why you would need to use a draw-through setup? I suppose propane doesn't require atomization like gas would, but it seems like you could do a blow-through setup which would require little to no modification of your system as it sits

LT

Talking to the guy that I bought my kit from and he said that drawn through is the only way to go with propane. He was the director for alternative fuels for Arizona so I am going to trust with what he has to say. Plus he has a built a number of custom drawn through turbo set ups and its basically set it up and drive off type deal. The entire propane system works on vacuum from the engine so it make sense to have it a drawn through instead of blow through.

What trim sizes would be recommended from the t3/t4 combo?

Smith-02

figure out what your engine will flow, and find a turbo compressor map thatll flow what your engine does, without going grossly oversized.