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420a stock internals turbo questions

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Timothyj94

10+ Year Contributor
166
0
Jun 6, 2011
Glen ellyn, Illinois
so im planning on turbocharging my 420a. Im gonna leave all internals stock for now, planning on rebuilding later, engine runs fine maybe some worn rings being that it has a couple hundred thousand miles on it. I was looking for some tips, and what exactly i need to do or get to do this. im on a really really tight budget so cheapest is best.

what else would i need to get if i bought this kit? Galant 2G 1G T3/T4 TURBO+31" INTERCOOLER+SS MANIFOLD SB | eBay

or suggestions on how to gather parts or another kit?

i tried searching been reading for weeks, not so helpful =/

im planning on keeping it under 5-6 psi, might go a little higher. i also have SOME basic knowledge of this conversion so dont yell at me haha.

thank you
 
that manifold won't work on your car. look at the description "w/ 4g63 engine"

don't buy it. it looks cheap, and you get what you pay for. throw your budget out the window, or don't boost IMO. and have you done a compression check? i would reccomend that before trying to boost an engine with high mileage. if you can't afford a good turbo setup, can you afford a new engine when you blow this one?

with that said, looks like you would need a turbo manifold, 12:1 FPR, a high pressure fuel pump, modified fuel rail w/ return line ran to gas tank, a downpipe, an AFR gauge, a way to mount the gauges, the tools to tap the oil pan, and the block for the feed line, or an oil filter sandwich adapter for the oil feed line.

*edit* if you have a 95' you probably already have a return fuel line.

sure i'm missing something. someone else will chime in, it's too early in the morning to be thinking right now. but honestly if you need to ask this question you didn't do enough of using the "search" function. just saying.
 
that manifold won't work on your car. look at the description "w/ 4g63 engine"

don't buy it. it looks cheap, and you get what you pay for. throw your budget out the window, or don't boost IMO.

with that said, looks like you would need a turbo manifold, 12:1 FPR, a high pressure fuel pump, modified fuel rail w/ return line ran to gas tank, a downpipe, an AFR gauge, a way to mount the gauges, the tools to tap the oil pan, and the block for the feed line, or an oil filter sandwich adapter for the oil feed line.

sure i'm missing something. someone else will chime in, it's too early in the morning to be thinking right now. but honestly if you need to ask this question you didn't do enough of using the "search" function. just saying.

in red why that? and yah i guess i kinda failed i missed that part, i wasnt gonna buy that kit anyways, it was just a general thing :ohdamn: but i fail haha yah its early.

i did search im just looking for more specifics, especially towards my engine

the manifold is a given i gotta find one, and downpipe from what ive read i have to have custom made?

"a high pressure fuel pump" - Walbro 255lph Fuel Pump <-- right?
 
a wally 255lph is the best imo. that's what was in my monster. for 6 psi though it would be overkill. a 190 would do just fine.

when you send extra fuel to the injectors, there should be somewhere for the extra fuel to go that isn't used, like back to the gas tank. I've heard of people not using a return fuel line, but to me it just seems like you're asking for trouble. You're pressurizing the system more then the factory intended, a return fuel line, relives that extra pressure. btw, look at the edit. 95's came with return fuel lines already. mostly. when they switched to OBDII, the return fuel line got nixxed.

oh, and an oil catch can, you'll need that as well. PCV block off plate.
 
a wally 255lph is the best imo. that's what was in my monster. for 6 psi though it would be overkill. a 190 would do just fine.

when you send extra fuel to the injectors, there should be somewhere for the extra fuel to go that isn't used, like back to the gas tank. I've heard of people not using a return fuel line, but to me it just seems like you're asking for trouble. btw, look at the edit. 95's came with return fuel lines already. mostly. when they switched to OBDII, the return fuel line got nixxed.

oh, and an oil catch can, you'll need that as well. PCV block off plate.

so i dont need the return fuel lines? yah i saw the edit right after i posted. im planning on increasing boost after i rebuild the engine though so i dont want to have to buy another fuel pump (oppinion?).

and whats the pcv block off plate (sounding like a noob) i tried googleing
 
then go for it.

if you want to go with bigger boost eventually, might as well go for bigger injectors and a tuning program.

or an 8 injector setup, that's what i had. stock injectors ran by stock ECU, secondary injectors ran my it's own program.

i can't remember what it's called been while since i was boosted, but you also need that thing that stops the stock ECU from seeing boost.
 
then go for it.

if you want to go with bigger boost eventually, might as well go for bigger injectors and a tuning program.

or an 8 injector setup, that's what i had. stock injectors ran by stock ECU, secondary injectors ran my it's own program.

i can't remember what it's called been while since i was boosted, but you also need that thing that stops the stock ECU from seeing boost.

need that before the rebuild, or right when i add turbo, thats only for the extra injectors right?
 
Okay, here is what you need.....I've seen a bit of misinformation so I'm going to clear it up a little.
Some sort of turbo manifold
Intercooler, piping, couples, and clamps
Blow off valve
A turbo to fit your manifold
Wastegate to fit manifold (or in some cases, an internally gated turbo)
A new downpipe
12:1 fmu (for an 8 lb build)
Walbro 255lph high pressure (recommended, I'm using a rewired stocker and its good for about 4 psi, maybe). The walbro can be ran with a stock regulator.
Boost gauge
*96+ model years* for the late model years with the "newer" fuel system, you will either need a fcd, or missing link.


*recommended parts, but not necessary*
Wideband o2 sensor
Fuel pump rewire kit
Oil pressure gauge

That about sums it up, there are plenty of threads you can reference back to if you need more information

then go for it.

if you want to go with bigger boost eventually, might as well go for bigger injectors and a tuning program.

or an 8 injector setup, that's what i had. stock injectors ran by stock ECU, secondary injectors ran my it's own program. hahn portfuler,good system but kinda pricy.

i can't remember what it's called been while since i was boosted, but you also need that thing that stops the stock ECU from seeing boost.fuel cut defender(fcd), or missing link.

need that before the rebuild, or right when i add turbo, thats only for the extra injectors right?

If anything, I would look into MSnS (megasquirt) for your tuning device. That is just my personal opinion though. Make sure you do your research on both.
 
Okay, here is what you need.....I've seen a bit of misinformation so I'm going to clear it up a little.
Some sort of turbo manifold
Intercooler, piping, couples, and clamps
Blow off valve
A turbo to fit your manifold
Wastegate to fit manifold (or in some cases, an internally gated turbo)
A new downpipe
12:1 fmu (for an 8 lb build)
Walbro 255lph high pressure (recommended, I'm using a rewired stocker and its good for about 4 psi, maybe). The walbro can be ran with a stock regulator.
Boost gauge
*96+ model years* for the late model years with the "newer" fuel system, you will either need a fcd, or missing link.


*recommended parts, but not necessary*
Wideband o2 sensor
Fuel pump rewire kit
Oil pressure gauge

That about sums it up, there are plenty of threads you can reference back to if you need more information





If anything, I would look into MSnS (megasquirt) for your tuning device. That is just my personal opinion though. Make sure you do your research on both.

In addition to Carters list you will need oil feed and return lines, filter for valve cover, a cone ait filter and some vacuum hose. It's little stuff but I thought I would add it in anyways also look at this.

http://www.dsmtuners.com/forums/420a-turbo-conversion/366603-end-all-parts-list-go-turbo.html

I have also had people tell me that on the 95's they needed to buy a fuel regulator for there 12:1 fmu since they deleted their stock reg. Maybe someone can confirm this. I would suggest a lot of reading in the 420a turbo section even though you can't post there.
 
I have also had people tell me that on the 95's they needed to buy a fuel regulator for there 12:1 fmu since they deleted their stock reg. Maybe someone can confirm this. I would suggest a lot of reading in the 420a turbo section even though you can't post there.

This is for adding an afpr into the sysytem. It involves modifying a stock regulator and disabling it then adding the afpr in as a new regulator. It isn't necessary for a basic build, as a stock regulator in good working condition will not be overrun by a 255hp pump.

There is a good write up on 2gnt.
http://www.2gnt.com/?d=How_to_Disable_the_95_fuel_regulator
 
a wally 255lph is the best imo. that's what was in my monster. for 6 psi though it would be overkill. a 190 would do just fine.

when you send extra fuel to the injectors, there should be somewhere for the extra fuel to go that isn't used, like back to the gas tank. I've heard of people not using a return fuel line, but to me it just seems like you're asking for trouble. You're pressurizing the system more then the factory intended, a return fuel line, relives that extra pressure. btw, look at the edit. 95's came with return fuel lines already. mostly. when they switched to OBDII, the return fuel line got nixxed.

oh, and an oil catch can, you'll need that as well. PCV block off plate.

okay, so does a 98 eclipse gs come with the return fuel line?, i have mine turboed and need bigger injectors, so i was just wondering.
 
okay, so does a 98 eclipse gs come with the return fuel line?, i have mine turboed and need bigger injectors, so i was just wondering.

Nope

This is for adding an afpr into the sysytem. It involves modifying a stock regulator and disabling it then adding the afpr in as a new regulator. It isn't necessary for a basic build, as a stock regulator in good working condition will not be overrun by a 255hp pump.

There is a good write up on 2gnt.
2GNT.com - How_to_Disable_the_95_fuel_regulator

Thanks Carter, as you can see
||
||
\/ I have a 96
 
Hahn racecraft has a kit for that car, comes with everything you need, back when I had a 420a motor I bought the stage 2 set up. You wont need a wally 255, the inline pump is more then enough. I was boosting 8psi on stock new motor. The kit is easy to instal, took my about 8 hours to do it with someone helping me
 
Nope



Thanks Carter, as you can see
||
||
\/ I have a 96

The fuel system changed during the 96 model year, so depending on your build date you some people may have the "early" fuel system. :thumb:
 
Hahn racecraft has a kit for that car, comes with everything you need, back when I had a 420a motor I bought the stage 2 set up. You wont need a wally 255, the inline pump is more then enough. I was boosting 8psi on stock new motor. The kit is easy to instal, took my about 8 hours to do it with someone helping me

You used the stock fuel pump and it was enough for 8psi?


I have a 1995 gs.... so i dont need a fuel return line correct, because you guys are confusing me ROFL????

Also,

*96+ model years* for the late model years with the "newer" fuel system, you will either need a fcd, or missing link.

So I don't need a FCD or Missing link because i have a 1995?
 
You used the stock fuel pump and it was enough for 8psi?

Nope his kit came with an inline fuel pump stock alone will not work. i'm not sure what type fuel pump comes with the Hahn kit but I do know that the inline Walbro 255 is more expensive than the in tank replacement walbro 255. So it's up to you.

I have a 1995 gs.... so i dont need a fuel return line correct, because you guys are confusing me ROFL????
Correct, however, you will need to install your FMU differently than a 96+ there is a write up on here maybe someone has a link ready for that.

EDIT: found it
http://www.dsmtuners.com/forums/420a-turbo-conversion/339520-95-fmu-install.html

So I don't need a FCD or Missing link because i have a 1995?
Correct
 
You used the stock fuel pump and it was enough for 8psi?
NO. I'm using a stock pump now, rewired because my walbro is causing over run and it is good for 3 psi according to my wideband, and even there it is running slightly lean.

I have a 1995 gs.... so i dont need a fuel return line correct, because you guys are confusing me ROFL????

95's have a return line.



So I don't need a FCD or Missing link because i have a 1995?

affirmative.

*edit* damn, beat me to it.
 
A few things that I didn't see that you will need is a blow off valve. If run with out one you will kill your turbo.

IMO you can get almost all your parts off ebay for cheap if you are on a really tight budget. My build was done all with ebay and I saved s good chunk plans changed half way and never put it on (going sc).

Do not go cheap on your turbo go used with a trusted brand like garrett or maybe even a holset. Right now If you look in the classifieds a member has a full kit for 1000$ id look into it.

The links that have been posted are very good and helped me get mine together 2gnt.com has a ton of good info as well(this site is still the best tho).
 
There's a 1g turbo at the junkyard by my house, anything I should pull off of there? Fuel pump would work?

The guy there likes me and let's me take shit for free alot. =]
 
You can only use the stock 1g or 2g turbos with either a custom manifold or some kinda of adapter. The fuel pump will not work or really a whole lot of other parts. The 4g63 its a different beast from the 420a almost nothing will interchange. Id say pull the side mount intercooler and piping along with the BOV. If it is all still their. The turbo manifold will not work off the 4g63 but take the down pipe you have to custom make one any way so at least you will have parts to start with. That is about all I can think of that you can use/ need. If you plan to go higher psi also look for a 95-99 mustang gt with red top injectors. They are a direct swap in with no modification needed most of the time you can pick them up for dirt cheap you you don't get it for free.
 
If I do go to higher psi, what's some not so obvious things I need to do when I rebuild the engine? To lower the compression
 
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