Why is it not a good idea to put turbo on a gs?

[Bobble]

Ive heard people talking, and people posting on this board about how its not a good idea to put turbo onto an GS engine. Why is that, or are they wrong? Ive been reading about it and i just dont seem to understand why. So hopefully someone can explain it to me better.

 

[knochgoon24]

You can do it, but it's a lot of work and a good bit of money. It usually works out cheaper just to save up the money, sell the GS, and buy a GST or GSX.

 

[born2tune]

its all about supporting mods, with it WIN without FAIL.

 

[Bobble]

You can do it, but it's a lot of work and a good bit of money. It usually works out cheaper just to save up the money, sell the GS, and buy a GST or GSX.

yeah but why is what im asking

 

[91boostfedGSX]

You can do it. A bunch of people do, its just cheaper to start with a gst or gsx.

 

[bombDSM]

The 420a engine is just not built for boost. You need to upgrade internals in order to even get past 5 psi. The 4g63 was built for boost and can handle alot of power on stock internals. You could probably find a turbo dsm for the price of an NT which is why it is easier to just get a 4g63.

 

[knochgoon24]

Why?

You'll need a bunch of parts to turbo a GS.

Here's an example: Hahns "Stage II kit"
Hahn Eclipse 420A Turbo Kits Include:
- HRC / Mitsu Super 16G Turbo
- Turbocharger Exhaust Manifold
- Ceramic Coated Downpipe Assembly
- Front-Mount Intercooler
- Intercooler Piping
- Air Inlet System w/ Filter
- Silicone Couplers and Clamps
- 3000GT VR4 Blow-Off Valve
- (4) 270cc Fuel Injectors
- Walbro 255LPH In-Tank Fuel Pump
- Rising Rate FMU
- Oil feed & Return Lines
- All Hardware, Wiring, Brackets & Gaskets

All for an additional 100whp.


For a GST or GSX, you can get 100whp for 1/4 the cost.

Small 16g, MBC, SAFC2, 560cc injectors, Evo 9 fuel pump.

Tada. Now at about 300whp.

 

[WES_393]

Theres no reason why you can't turbocharge any non-turbo engine. But turbo DSM's are much easier to tune and build since they came turbo from the factory. You have all the fuel adjustment ability you need, where in a NT car the ECU has very little fuel control. There is also the small issue of compression ratio. Non-turbo engines tend to have a higher compression ratio which can cause detonation/pre-ignition much easier than low comp pistons found in turbo engines. I'm not saying high comp pistons are bad, many turbo guys are using higher comp pistons for more power on and off of boost. But they aren't as "safe" to use when it's your first rodeo with tuning and boosted engines.

But if you really want to boost your engine, it's totally possible with enough research, time, and money. I have a friend with a 2JZ-GE (NA Supra engine) that is currently running a Turbonetics 60-1 and has hit over 350hp on the dyno with stock internals, 10.5:1 compression, and nothing more than a stand-alone fuel system. However, he spent more cash on his turbo kit than I did for my entire engine. So can it be done? Definitely. Is it cost effective compared to a turbo DSM? Definitely not.

 

[Bomalleygst]

^ Very well said you guys. Completely possible. Just more work and more money. But if thats not a problem for you then go for it.

 

[Leonthefaded]

I hate the words. Sell your GS and buy a GST. But ultimatly thats what I did except I said screw a GST I'll get a GSX. Its a very long road to travel turboing a 420a. The 420a is the best motor I've seen, still. But Mitsubishi lacked maybe alittle common sense when they didnt turbocharge it.

I would seriously consider rebuilding a 420 motor on the side, little by little while you upgrade your platform with the supporting mods. And set clear acheivable HP goals.

 

[killercolt]

it all comes down to ems that you can get for it. you can build a 420a but what ems can you use to tune it that will make it reliable is the question you should ask first. a good build without a good tune will not do you any good.

 

[Leonthefaded]

it all comes down to ems that you can get for it. you can build a 420a but what ems can you use to tune it that will make it reliable is the question you should ask first. a good build without a good tune will not do you any good.

Of course Megasquirt or AEM standalone. I've heard good things about both! but its only my opinion

 

[DSM_ed]

From experiance, I can tell you that it will cost alot of money. When I got my first dsm it was a 95rs(same thing has the gs just not has luxurious with power everything) I bought a cheap little turbo kit for it, and after a while I kept hearing that 420a engines can handle atleat 8 psi. Well after having it at 5 psi for a week I turned it up to 8 and after my first 8psi pull I threw a rod...I was very mad...very..but those days I didnt know what a gst or gsx even were. After reading and reading, I kept coming across the statement "420a blocks are no good", it cost as much as a decent gst or tsi to make it has strong has the 7 bolt or maybe the six bolt. So if you like getting your hands dirty, and most of your money spent you can build the 420aT, but it really is cheaper to go with a gst,gsx,tsi,tsi-awd

this is what i had on it.
ebay turbo kit
450cc
and i tuned with a aem o2 and a safc2,
had only 96xxx miles on it...so i know it couldnt have blown cause of a mech failure, I did replace everything too. (oem oil pump, oem t-belt, etc etc.)

 

[talonawd1991]

it is alot of money to build a gs/ rs/ 420a motor
this is the reason i sold mine and got my awd tsi and never looked back

 

[tfaulk21]

I never get tired of this question hahaha even on the 90-94 n/t dsms came with a 4g63 I have one in my avatar picture but don't even dare trying to turbo it unless you have money and are mechanicaly incline haha I just bought a 97 talon tsi last night Yayy it needs work but I got a working car for 1000 dollars where as turboing a non turbo car can be disasterious and very expensive

 

[Cdc1221]

Hey i cant blame the guy. I had my dreams of building a 420atmotor for my 98 2gnt. I swapped it from auto to manual, had nice 18s on it, then i totalled it. Now im the proud owner of a bone stock 95 gst with 90k on it and less than 10k on the engine. I picked it up for 2200, which is less than you would pay to build a 420a for boost, much less buy a turbo kit for it.

 

[jrohner]

Why? Because they made a turbo one stock, so why spend all the money to have a car inferior to a stock GST/GSX?

 

[NWHTanK]

Lol at alot of money to turbo a gs. So far I am out 400 bucks. But the time in the car is alot and hasnt cost me money either.

 

[Cdc1221]

eh well i was thinking forged pistons, new rods, a port polish job(which i could actually do myself) along with boring the block. basically i wanted a 400hp+ beast. maybe its something i will pursue when i have a little more money and have my gst the way i want it

 

[jrohner]

eh well i was thinking forged pistons, new rods, a port polish job(which i could actually do myself) along with boring the block. basically i wanted a 400hp+ beast. maybe its something i will pursue when i have a little more money and have my gst the way i want it

The 4g63 does much more than 400 stock easily.

 

[Laggg]

if you turbo a gs not only will it cost you tons, which everyone is saying. but it the only real up is if you dont change your pistons you will have a higher compression.. all and all i would say just get a turbo car

 

[andyvr2]

Money

 

[hazmat6135]

The 420a is the best motor I've seen, still. But Mitsubishi lacked maybe alittle common sense when they didnt turbocharge it.

I would seriously consider rebuilding a 420 motor on the side, little by little while you upgrade your platform with the supporting mods. And set clear acheivable HP goals.

WTF
WHAT! ok first off. The 420a is a horrible little gas saver. Not a high performance motor like the 4G. Mitsubishi didn't turbo it because it's not a mitsu motor! It's a chrysler motor and is pretty much junk. Mitsu used it for the base model because it was cheap and they had a deal with Chrysler when they bought them out of the DSM contract and turned into MMA in 1995. Any motor can be built and boosted but when there is a better platform available its alot cheaper and more reliable to go that direction. hence why everyone says. "sell the gs and buy the gst"

 

[stars]

Listen to the guys the money issue is right. I spent $400 cash for 92 Talon GST w/113K and it came with a stock EPROM, your gonna spend more than your cars worth in the end guaranteed......

well said hazmat!! I wanted to say that but, you beat me to it first =)

 

[WES_393]

your gonna spend more than your cars worth in the end guaranteed......

I could play devil's advocate and say none of us will ever get back the money we have put into our cars. Most of us have poured thousands into these cars to make them what we want knowing we'll never see those dimes again. So I can't say 420a owners are wrong for doing the same.

OP- If you already have a GST, why not keep the 420a as a nice DD? Like said above, there's nothing wrong with boosting a 420a, but I know from expereince that maintaining/building two cars at once can be a huge pain. Especially when your trying to use both as DD's.