4G93 and going turbo questions! :)

Dennil

New Member
Hello I'm new to the forum and I would say that i am quite the novice when it comes to working on my car. I can change the oil, dump the coolant all the things that you could get from a minor service I guess. But I have realized recently that my Red CE lancer is lacking something in its heart. A TURBO! I'm a bit of sponge when it comes to learning new things so I thought I will give going turbo a try, If something goes wrong I will suffer the consequences but that's why I am asking a few questions that have arose in my mind about going turbo and just that.

-first question is, what would be the best turbo to select for medium gains. I don't want to go crazy and have something of fire breathing monster just more looking for something that is nice to cruise in (she's been neglected for a little while).
So far I have found that a Garret G25 would a bit overkill am i right? especially if i only want a decent marginal increase.

-Now second question where or how would I find a downpipe that would connect directly to the stock exhaust sytstem? I have seen around here and other places that an evo 3 inch will bolt up to most flanges but then again not certain. I've tried searching on ebay for a downpipe designed specifically for going turbo with your 4g93 but to no avail! but seeing i don't really know much it makes sense as to why I probably can't find it.

-now question 3 I know that a 4G93 motor can handle a fair bit of boost. but how to control that level to stay below the threshold is my question, is that done through a Piggyback ems or a turbo timer? by the sound in the name it seems that the timing of the turbo is reliant on the spooling time between RPM changes.

-last question! for low boost do you need to have a piggyback or some kind of management or can you rely on the stock computer and a standard tune? which I highly f**king doubt because it can't do anything.

I just want to make sure i do this right and don't throw away money where i don't have to for my particular setup
 
To control the boost you need an electronic boost controller. Your SOHC 4g93 turbo setup will need to be 95% custom unless you do a DOHC swap first and then source CM5A gear. Custom manifold, custom flange, custom cooler piping, haltech ecu or similar. It will be expensive. Unless you can find 2nd hand bits for cheap.

TD04, TD05, T25 and T28 are your moderate options. TD04 and T25 being smaller and easier in your internals. Should be able to handle between 6-10 psi for a while.
 
Dennil said:
-first question is, what would be the best turbo to select for medium gains. Yep the Garrett T25 is the go for you, they do come standard on SAAB's so could get cheap

-Now second question where or how would I find a downpipe that would connect directly to the stock exhaust sytstem?
I'm thinking you mean a manifold for the turbo, yes? The downpipe is from the turbo to your exhaust, which depending on your choice of turbo could be used from the turbos factory application, or you just get the exhaust shop to fabricate one for you. The manifold between engine and turbo again would be custom made, not terribly hard to do, need some steam pipe bends and you cut them to fit and then weld together

-now question 3 I know that a 4G93 motor can handle a fair bit of boost. but how to control that level to stay below the threshold is my question, is that done through a Piggyback ems or a turbo timer? by the sound in the name it seems that the timing of the turbo is reliant on the spooling time between RPM changes.
Two things here, the turbo's boost is controlled by your actuator on a tame setup, which uses vacuum, so you buy a cheap Turbosmart boost controller ($75) in between the vacuum line to control how much your actuator opens/bleeds boost. The turbo timer is a cool down device, not necessary if you cool the engine/turbo down after a hard run, but essentially the turbo timer leaves the car running after you turn the car off for a pre-set amount of time to let everything stabilise

-last question! for low boost do you need to have a piggyback or some kind of management or can you rely on the stock computer and a standard tune? For almost any boost you need to upgrade the amount of fuel getting to your engine, so you would use a piggyback ecu which only controls fuel or fuel and timing to your engine, i don't think your stock ecu could learn to put enough fuel in at the right times. Depending on boost, you would also need to factor in bigger fuel injectors and possibly fuel pump upgrade
 
@rigby stock 4g93 is more than capable of handling 6-10 psi. My stock 4g93 was a 14psi turbo'ed daily with bumper to bumper traffic driving and had almost 550,000km on the engine block.

If your really serious about going turbo, I have a turbo smart boost controller for sale if you need it

Sent from my GT-I9505 using Tapatalk 2
 
Mr_LanRydar said:
My stock 4g93 was a 14psi turbo'ed daily with bumper to bumper traffic driving

Thats why it didnt blow up lol. How often did you hit 14psi in bumper to bumper traffic...
 
You want to get the first manifold though, the one with the t25 flange, most common flange used amongst garrett turbos not to mention, if you do decide to go with a t25 turbo that will match with that manifold flange.

Also have to remmember you need to factor in other things like, oil and coolant feed lines, getting your sump welded for an oil feed supply, intercooler + piping, as mentioned above, bigger injectors and fuel pump upgrade, matching the rest of the exhuast system, and your best off getting a standalone ecu rather than a piggyback as it will give your more options on how you want the car to run

Unless you do all the labour yourself and get everything second hand (even still), this is an expensive path to take, then factor in a tune which will not be cheap if someone else does it for you
 
Thanks heaps to you all for the great help! Such fast replies, I don't know too much about the topic but I have been doing constant research and this right here helped even more. Well I'm aiming for the slow approach take my time and slowly build up a kit I've done some slight plumbing work making a cold air intake that I don't use any more which was successful just never had a chance (or didn't really bother) getting a tune. Now that would be throwing money away, I have a little bit of a budget to play with but still taking my time with it because for one it will be my first set up and for another I'm a student so bread and water diet for me :) now to do with the oil feed and welding I spoke to a local tune shop guy today and he said that there are a lets say bolt in bung so what you do is drill a hole in the sump attach the bolt on bung with two nuts and it has a seal also found out it has to be in a specific spot otherwise it will feed back up the line, and you'll have a splatter car, which makes sense.

Also planing to do the build by myself and the only thing that I want to get done professionally is the exhaust, pretty sure I can do the rest myself, so just kicking a long slowly and picking the bits up as I go

Once again thanks for all your feedback everyone really helpful
 
lilandonaki said:
Mr_LanRydar said:
My stock 4g93 was a 14psi turbo'ed daily with bumper to bumper traffic driving

Thats why it didnt blow up lol. How often did you hit 14psi in bumper to bumper traffic...

well i went touge runs every weekend :D (I actually did, not trolling)
 
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