Does anyone has much expertise in this topic? There are tons of intercooled turbo 1HZ build threads but virtually none for the 1PZ although they are so similar.
I'm just wondering how much gain in power can I expect if I compare dyno runs between an NA 1PZ and a Turbo-intercooled 1PZ?
Will it be more powerful than the 1KZ-TE with an intercooler? I know it will be more reliable, so please don't tell me that. I just want to know if it's worth spending more on a 1PZ-T rather than just getting a 1KZ-TE in terms of power.
I think crushers built a 1PZ turbo and really liked it. Made tons of power from what he said. He may chime in here. My guess is it will make at least 50% more torque; probably more if you push it a bit.
I think anytime you are dealing with a turbo charged IDI Toyota diesel you are going to run the risk of temperature related issues though. But generally the bigger the displacement of the engine, the less hard it'll have to work to do the same job. So in that sense a 1PZ may be better than a 1KZ. That said, Toyota does beef up the bottom end of their turbo engines. So my guess is the 1KZ bottom will be stronger with things like reinforced piston ring lands, big rods, etc and will last longer (even if the head doesn't last).
That sounds pretty good to me. I doubt I'd be pushing it much. I just don't want it to be so sluggish. Probably around 7-12psi is what I'm aiming for (though I've seen people do crazy stuff like 25psi on a 1HZ). 50% is quite a bit already. I searched for his threads and they weren't much info about the 1PZ turbo he did.
I know lots of people hate the 1KZ here, but I've got personal experience in it. With proper timely maintainence, it can last pretty well even if you trash it. My dad's one was an example of it. It's a company delivery truck and we maintain it in a timely manner. It regularly carries around 400-500kg of cargo and we are pretty lead foot drivers (going up steep hills maintaining at 100kmph). Head's still strong at 360,000kms and this is without an intercooler.
Hence I'm not at all too fussed if I had to get a 1KZ again. But since a nice PZJ77 appeared, I was thinking if it's worth getting it and chucking a turbo and intercooler on it. Price of the PZJ77 + turbo and intercooler install > Price of a KZJ78 + intercooler install.
The weak point is the dual mass fly wheel which I hear will shortly go after turboing the thing.
I recommend to anyone that if your going to turbo your 1HZ plan for the clutch to be replaced with a heavy duty one. There are multiple kinds. Once you turn your fuel up and get a good tune going it will start slipping when you hammer on it.
1PZ lacks the electronics which I hate when it comes to troubleshooting and is more reliable in my opinion.
1PZ has an 11mm plunger on their injection pump. I highly suggest putting a boost comp on them as well. Actually scratch that strongly suggest that. Allows a more efficient fuel delivery/fuel ramp instead of just turning up the max fuel screw and having rich AFRs down low.
Boost won't kill your engine, rich AFRs and EGTs will because of the excessive heat and pressures created. People who run 7lbs because they are scared of boosting their engines a lot of times run crappy tunes and end up hurting their engines because their AFRS are too rich. The people who do poor tunes and blow a truck up blame it on the engine and not their poor knowledge on the subject.
You are far better off running a correct turbo at a higher boost level and getting a bit more power out of it along with a lean/cool EGT tune where you will get true reliable power. Most people running 25lbs of boost are probably running very lean AFRS. Hense why you don't hear of too many people blowing them up.
BigBoy has stated many a time the stock 1hz pump is good for 17-18lbs of boost before it runs out of fuel for a 22:1 AFR tune.
There is no point on running higher boost pressures than that really with the stock pump. I don't know what the PZ will be capable of but I would imagine it would be around the 130rwhp mark (Just a guess)
Front mounts are a pain on the earlier 70 series because of the AC piping. I ended up going top mount air to air and it does the trick.
There is also no point intercooling if your not planning on boosting above the 15-18psi range (depending on your turbo)
A full turbo kit, 3" exhaust, gauges and s*** will roughly cost you probably close to $5000.
$800 for a clutch
$300 for a boost comp
Intercooler can be cheap or expensive depending on the route you go.
