Need info turboing 4g93

W

waterysoup

New Member
So I've taken a good look through the threads and I can't find any specific info on what I need to do to my stock 4g93 to be able to handle about 20 psi I'm just making this thread for any help on what internals I would be looking at or heads since I'm quite new to the lancer scene any help would be greatly appreciated (provide links please)
I own a 2002 1.8L CE coupe
 
Guess you probably need to start with asking why 20psi? Is it just a cool number, is there something you expect at 20psi?

If you can settle for 15psi and 18ish on occasion, there’s no reason to open the motor. Find yourself a good tuner and follow one of the few 4g9x turbo recipes on here.

To handle 20psi all day every day, you will need forged rods and pistons. K1 rods are usually the go, and pistons can be sourced from several places. You will of course need new hardware, tougher rod bolts, main cap bolts and head studs. ARP stuff is all through my motor.

Replace the oil pump and bypass. A new pickup wouldnt go astray either.

The ideal setup is to find a CM5A dohc head, but they are rare and pricey.

Plenty of re-grind cams around for the sohc, just chase one with the specs to suit your desired power band. Std sohc head won’t hold you back if your goal is 20psi - it may hold you back if you want x kw.
 
SDate42 said:
Guess you probably need to start with asking why 20psi? Is it just a cool number, is there something you expect at 20psi?

If you can settle for 15psi and 18ish on occasion, there’s no reason to open the motor. Find yourself a good tuner and follow one of the few 4g9x turbo recipes on here.

To handle 20psi all day every day, you will need forged rods and pistons. K1 rods are usually the go, and pistons can be sourced from several places. You will of course need new hardware, tougher rod bolts, main cap bolts and head studs. ARP stuff is all through my motor.

Replace the oil pump and bypass. A new pickup wouldnt go astray either.

The ideal setup is to find a CM5A dohc head, but they are rare and pricey.

Plenty of re-grind cams around for the sohc, just chase one with the specs to suit your desired power band. Std sohc head won’t hold you back if your goal is 20psi - it may hold you back if you want x kw.
Click to expand...
I'm going for 20 psi because I saw that 7 psi would even be good but 20 psi could aim for the 300-400hp I'm looking for. Anyway thank you for the info.
 
300+hp is a big target! Considering it likely makes 100hp as it is now, that’s a HUGE increase. If you have an auto, I’m not sure I’ve seen one hold that kind of power.

If you’re serious about that kind of power that’s going to take a fully forged, balanced and carefully constructed bottom end. You’ll be out of the realm of bolt on and off the shelf approaching 300hp.

Definitely not impossible by any means, but prepare your wallet haha
 
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