The 2F/3F Turbo Build thread (Post yours/others)

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oddballs

Joined
Jul 25, 2025
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Location
Australia
Hi all,

I am looking into fitting a turbo + fuel injection to my 3F and just looking for some inspiration. I've done a bit of a search but can't seem to find much about these motors.

Mine will be Fuel injected and inter cooled with homemade log manifold for turbo, i'm mainly interested in fuel injection setups obviously with aftermarket engine management but still happy to look at carby turbo setups as well.

Also interested in any tricks etc to keep it holding together. I know very little about the 3F.
 
Fortunately, Toyota did all the hard work and designed and built an entire port injection setup for you already. It’s called a 3FE. So get yourself a cylinder head, intake, exhaust manifolds, fuel rail etc. the 3FE exhaust manifolds are very well suited to make an easy J-pipe and bolt to them. Especially since you are RHD and don’t have the steering column there.

Next, mount up some ignition coils, decide how you will reference crankshaft timing, and choose an ECU that best suits your goals and needs.

If you want it to live while making good power you will need to control your ignition timing and fuel. The other thing is avoiding big RPM drop on a shift while making peak torque which is how you bend a rod. This is hard with a LC manual transmission as they have pretty wide ratio spread.
 
Ultimately though you need to really define your goals first.
How much horsepower then stock do you want? 50? 100? 150? 200?
 
Yeah I heard about the 3FE motors, think they came out in the 80 series down the line? If I could get the injection gear from one of them that would be a big help but not sure how common they are in Australia or if they are desirable at all and worth big $$$

Yeah was planing on doing spark and fuel control as well as having a wide band hooked up to it. I have a bunch of bits that I have bought before for other projects that I haven't started yet so I could donate them to the 3F turbo build.

Ideally I would like to double the horse power, think they make 137HP in stock form so times that by 2 and you end up with 274HP but round it up to 275HP as it sounds better , but I'd probably settle for 250HP if it were to come to that :p
 
Some reading for you, assuming you haven't done any searching:

R

Post in thread '3FE Turbo "Kit" (FJ62 or 91-92 fj80)'

akarilo said:
Maybe you're familiar with this build, but maybe not. I built the system from scratch 5 or 6 years ago. It's 1 of only 2 3FE turbos that I'm familiar with. I ran it for a couple of years and then the truck went through "several" other owners, neither of which had any mechanical inclination. The current owner of the truck contacted me via/ MUD and stated that he wanted to restore the truck to original. I asked him if it was worth losing 40hp; he said it didn't matter. We struck a deal and long story short, I have the entire "system" again. I think it speaks volumes that the truck...
Click to expand...

akarilo

Thread 'Can you Turbo a 3FE?'

Of course!
Badge.jpg
 
oddballs said:
Yeah I heard about the 3FE motors, think they came out in the 80 series down the line? If I could get the injection gear from one of them that would be a big help but not sure how common they are in Australia or if they are desirable at all and worth big $$$

Yeah was planing on doing spark and fuel control as well as having a wide band hooked up to it. I have a bunch of bits that I have bought before for other projects that I haven't started yet so I could donate them to the 3F turbo build.

Ideally I would like to double the horse power, think they make 137HP in stock form so times that by 2 and you end up with 274HP but round it up to 275HP as it sounds better , but I'd probably settle for 250HP if it were to come to that :p
Click to expand...

Good rule of thumb with forced induction is doubling manifold pressure will double you power. So 14-15psi boost. This is obviously dependent on turbo sizing, a bigger turbo will flow more volume at the same psi then a smaller turbo
 
Is the 3F going to hold up at 15psi with 4 crank bearings holding it all together? Anyone ever fit a crank girdle to a 2F/3F before?
 
cruisermatt said:
The other thing is avoiding big RPM drop on a shift while making peak torque which is how you bend a rod. This is hard with a LC manual transmission as they have pretty wide ratio spread.
Click to expand...
Is there a fail safe way of doing this with a manual
 
oddballs said:
To do that you would need an electronic waste gate? Is that correct?
Click to expand...
Preferably to control boost but a vss in the transfer case would be ideal. Easiest is set your boost at a moderate 6 lbs to start.
I will be getting some mls headgaskets made. My biggest concern is keeping the head from lifting. Not like I would be drag racing this thing. It's pretty much for high altitudes.
If I were you, use 3f-e manifolds and build from there. My plan was originally to keep the turbo on the same side as intake but I would be doing a crossover.
 
oddballs said:
Is the 3F going to hold up at 15psi with 4 crank bearings holding it all together? Anyone ever fit a crank girdle to a 2F/3F before?
Click to expand...

a healthy 3F makes over 150psi of compression normally. 15 more psi on top of that isn't going to be what hurts your rotating assembly. It's a big RPM drop on a shift while making all that power which will spit out a bearing, bent a rod, etc

Imagine how your body reacts when someone throws you something really heavy, but you are prepared for it and catch it smothly, vs it just smashing into you. It's the same priniciple
 
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chelo said:
Boost by rpm. Depends on the ecu you will use. I'm semi in the process of a 2f turbo build.
Click to expand...

You don't want to rely on boost control for that. It isn't fast enough. much better to pull ignition timing.

reading anything post-transmisison doesn't work as that is a linear reading with vehicle speed. Better to use a clutch switch, strain gauge on shifter, etc
 
chelo said:
I will be getting some mls headgaskets made. My biggest concern is keeping the head from lifting. Not like I would be drag racing this thing. It's pretty much for high altitudes.
If I were you, use 3f-e manifolds and build from there. My plan was originally to keep the turbo on the same side as intake but I would be doing a crossover.
Click to expand...
Yeah I was thinking about doing the cross over setup as well, I am sure there is plenty of room for it. I haven't had a good look. I am also very tempted to use a water to air intercooler, I have all the bits sitting around so it is an option.

Do you have any details on your setup? Some photos/thread?
 
oddballs said:
So are you saying if an automatic transmission was used this problem will be eliminated?
Click to expand...
It's a lot safer. You still have to have the right torque converter for your vehicle weight, torque curve, goals etc.
 
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