Want to Turbo 4g64 1998 Mitsubishi Triton

[Volodya]

Hi there, I'm new to cars and would like to turbo my 1998 Mitsubishi Triton.
It's a 4g64 and I'm planning on rebuilding the engine, putting a DOHC head from a 4g63 on it and an Evo 2 turbo.

I'm unsure if I would if I would need lower compression pistons or if I could run stock internals at a lower psi. (I'm not looking for a lot of power but I believe doing this would get me 250-300hp from my 150hp) Would there be anything else I'd need to prep for a turbo also?

Thanks for any help

 

[pauleyman]

Many people have done what you are suggesting with stock internals. How well it holds up will depend on your quality of fuel, quality of the tune and the general health of the engine. 250 to 300 at lower boost is not likely going to happen. You're going to need to do some research into the changes, You'll need fuel injectors, a tuning solution, ECU etc etc.
What do you know so far?

 

[Volodya]

Many people have done what you are suggesting with stock internals. How well it holds up will depend on your quality of fuel, quality of the tune and the general health of the engine. 250 to 300 at lower boost is not likely going to happen. You're going to need to do some research into the changes, You'll need fuel injectors, a tuning solution, ECU etc etc.
What do you know so far?

I don't know much, I'm doing as much research as I can. ATM my concern is anything else I have to do eg, exhaust or intake modifications just to make it fit. Currently I'm having trouble sourcing a DOHC head, I've found one but it doesn't have cam gears or a rocker cover. Also how much psi could I run on stock internals?

 

[pauleyman]

I don't know much, I'm doing as much research as I can. ATM my concern is anything else I have to do eg, exhaust or intake modifications just to make it fit. Currently I'm having trouble sourcing a DOHC head, I've found one but it doesn't have cam gears or a rocker cover. Also how much psi could I run on stock internals?

There is no way to answer that question. Too many other factors come into play. Fuel. Tune. Timing. Knock etc etc. Personally I would turbo it as is first. Especially if you want to start at low boost. You're still going to need a lot of stuff.

 

[DSMPT]

Currently I'm having trouble sourcing a DOHC head, I've found one but it doesn't have cam gears or a rocker cover.

I don't know much about your car but if the 4g64 in your car is the early style and if you are looking for a DOHC head, try looking for one in early Evo communities (I imagine there are many in Australia). If the engine is the late style, then in late Evo communities.
As for the cams and cam gears, you can use 4g63 aftermarket adjustable cam gears and DOHC 4g63 cams.

 

[Volodya]

There is no way to answer that question. Too many other factors come into play. Fuel. Tune. Timing. Knock etc etc. Personally I would turbo it as is first. Especially if you want to start at low boost. You're still going to need alot of stuff.

I get that but I'm going to rebuild it before I turbo it (295k on the engine) and don't want to tear it apart again to put the head on, although it looks like I have to cause im having trouble finding a dohc with a rocker cover

 

[pauleyman]

I get that but I'm going to rebuild it before I turbo it (295k on the engine) and don't want to tear it apart again to put the head on, although it looks like I have to cause im having trouble finding a dohc with a rocker cover

If you're going to rebuild it then put whatever internals you want in it to suit what you need.

 

[Screemin eagle]

You’ll need all the dohc timing components and oil pump. I believe the stock pistons don’t have valve reliefs in the correct spots. There is good info on the Aussie station site on what you neeed to do

 

[Volodya]

You’ll need all the dohc timing components and oil pump. I believe the stock pistons don’t have valve reliefs in the correct spots. There is good info on the Aussie station site on what you neeed to do

I've done some more research, I've found a 4g64 dohc timing belt that should work, I believe I still need adjustable 4g63 cams or 4g64 cam to get the timing correct. Though I don't know why I have to replace the oil pump

 

[DSMPT]

I believe I still need adjustable 4g63 cams or 4g64 cam to get the timing correct.

You don't need 4g64 "camshafts". What need to be adjustable is cam gear. As for the valve timing, just get a set of 4g63 camshafts and aftermarket 4g63 adjustable cam gears or modify the stock dohc 4g63 cam gears by making a new cam dowel hole about half a tooth off from the 4g63 dowel pin hole position.

Though I don't know why I have to replace the oil pump

I guess he was talking about sohc g62/63b's dohc swap or so, which have a narrower oil pump gear/sprocket that don't fit with a wider dohc 4g6 belt. So it would require to replace the oil pump with a dohc 4g6 one.

 

[Volodya]

You don't need 4g64 "camshafts". What need to be adjustable is cam gear. As for the valve timing, just get a set of 4g63 camshafts and aftermarket 4g63 adjustable cam gears or modify the stock dohc 4g63 cam gears by making a new cam dowel hole about half a tooth off from the 4g63 dowel pin hole position.

I guess he was talking about sohc g62/63b's dohc swap or so, which have a narrower oil pump gear/sprocket that don't fit with a wider dohc 4g6 belt. So it would require to replace the oil pump with a dohc 4g6 one.

Sorry I was a bit tired, I did mean cam gears, do you believe the 4g64 dohc cam gears would work perfectly or is adjustable 4g63 the better route? Assuming I can find the 4g64 cam gears that is.
So I would require a dohc oil pump?

 

[DSMPT]

do you believe the 4g64 dohc cam gears would work perfectly or is adjustable 4g63 the better route?

If you can source the stock dohc 4g64 cam gears, that would be the easiest way for you, especially if you are not so familiar to set the valve timing since you can just follow the factory timing marks. The aftermarket 4g63 adjustable cam gears would work the same. It's just many people get confused when they set the timing but it would allow you to change the valve timing in the future when you want. Usually to source the stock 4g64 cam gears is more difficult than buying aftermarket 4g63 adjustable gears though.

So I would require a dohc oil pump?

If the engine is 4g64, then no need.

 

[Volodya]

I'm back, unfortunately I had a lot of set backs, got involved in a car accident that destroyed my front end. Bought a new Triton with the same engine intending to rebuild the previous engine (still runs). However I went on a big trip to buy an Evo head and turbo and my new car broke down on the way back. I believe its got piston slap. I now intend to rebuild the new motor and swap the old one into the new car temporarily. However the 4g64 DOHC timing belt I was going to buy went out of stock. My current question is can I use a 63 DOHC or standard 64 belt with adjustable cams, would I need to change anything else if I do the 63 belt?

 

[Volodya]

Duplicate post removed.