94 Galant GS pistons

[mysticj]

Have you thought of using the Hyundai G4JS pistons?

[Galanttuner10]

all of those part numbers are gone? i have oversized piston part numbers and 2 more std size part numbers for each piston

[Joel91GS]

Have you thought of using the Hyundai G4JS pistons?

I did that once before as an experiement, but the CR was so high I couldnt run anything that didnt detonate like crazy. AND, the wristpins are a different size, 1mm different. I did realize then tho, that the valve reliefs dont have to match unless youre planning on redlining it. Did you ever try them?

[Joel91GS]

all of those part numbers are gone? i have oversized piston part numbers and 2 more std size part numbers for each piston

I contacted two seperate dealers, but it was only the GS piston that is gone, the standard ones are readily available.

[Galanttuner10]

I contacted two seperate dealers, but it was only the GS piston that is gone, the standard ones are readily available.

now they said they are just discontinued? out of production? they didnt say a new piston took their place? weird.

[Galanttuner10]

i entered the GS piston part number at oemmitsubishiparts.com and they came up, maybe see if they can get them. i will talk to my dealer today

[mysticj]

I did that once before as an experiement, but the CR was so high I couldnt run anything that didnt detonate like crazy. AND, the wristpins are a different size, 1mm different. I did realize then tho, that the valve reliefs dont have to match unless youre planning on redlining it. Did you ever try them?

Switching to a 1G rod should have done the trick.

I was planning to in the future but I guess using a milled 4G67 head to raise compression should do the trick.

[Joel91GS]

i entered the GS piston part number at oemmitsubishiparts.com and they came up, maybe see if they can get them. i will talk to my dealer today

Oh yeah, they come up, but when I attempted to order they emailed me and said not available in any warehouse anywhere. But sure, throw the part number at your dealer and maybe youll get a different story. Hey how many of these GSs did they make in 94?

[Joel91GS]

Switching to a 1G rod should have done the trick.

I was planning to in the future but I guess using a milled 4G67 head to raise compression should do the trick.

I think the 1G rod journals are wider and you would have to have them reduced but maybe only by a mm or 2. They take a wider bearing as well. Do you know anyone that retrofitted a 1g rod into a 2g setup?

[mysticj]

Hey how many of these GSs did they make in 94?

About 1660 of them.

I think the 1G rod journals are wider and you would have to have them reduced but maybe only by a mm or 2. They take a wider bearing as well. Do you know anyone that retrofitted a 1g rod into a 2g setup?

How about using the G4JS rods with the G4JS pistons?

The reason why you had so much knock with the high compression is because of the use of stock cams and 4G63 ecu. The ignition maps are too high and the stock cams increase the dynamic compression. There is only so much room allow to increase static compression and still run pump gas. The reason to increase static compression is not only to increase horsepower but to regain lost dynamic compression when using a bigger cam.

[Galanttuner10]

everything from the GS is completely obsolete and unavailable. the only parts still available are the rods. honestly go aftermarket or even go 96-98 64. and for rids, do the frankenstein setup. 1g rod bored out for the 22mm pin

[Joel91GS]

The 10.5:1s are readily availablefrom wiseco and I wouldnt have to change anything at all, cept them of course! I have the 2.4 cams and head / intake already, 32k on the head that I have!

Wish you guys lived closer, would be cool to check out your car. There is a local guy that just got a 91 VR4, and has been calling me for help with it, the manual trans in it is shot, and I dont think he will ever find a new one, or someone that could fix it. And the the timing cover swelled and is rubbing on the belts.

[Galanttuner10]

the gs cylinder head assembly part number has been obsoleted too and is now the 2g head assembly as well just so you guys know

[mysticj]

everything from the GS is completely obsolete and unavailable. the only parts still available are the rods. honestly go aftermarket or even go 96-98 64. and for rids, do the frankenstein setup. 1g rod bored out for the 22mm pin

Even the cams aren't worth spit, IMO. That's why I'm going HKS 272 on the intake side but keeping the exhaust, which is 264.

FYI, The GS cylinder head = 95-96 Eclipse = Lancer Evo III.

What ECU are you going to use?

[Galanttuner10]

Even the cams aren't worth spit, IMO. That's why I'm going HKS 272 on the intake side but keeping the exhaust, which is 264.

FYI, The GS cylinder head = 95-96 Eclipse = Lancer Evo III.

What ECU are you going to use?

i have a 96 ecu setup, but will be going 95 eprom with link

[Joel91GS]

the gs cylinder head assembly part number has been obsoleted too and is now the 2g head assembly as well just so you guys know

WEll fortunately the Hyundai Sonata in 97 and 98 had the exact head and intake and I have one! Thats why I didnt bother to buy the head and intake at the junkyard once I saw it in person.

[Joel91GS]

i have a 96 ecu setup, but will be going 95 eprom with link

I think I have one of those, is there an E somewhere in the part number? I think its on my shelf....I also have the Hyundai 2.0 ECM, same plugs, and I cant notice a difference in performance between one or the other.

[Joel91GS]

Here is a pic of the 2G head and intake / exhaust that Im switching to . Im starting to prep it. I have enough spare parts that I can pretty much assemble the entire assembly.I just have to have an o2 sensor port welded on the header.

[Galanttuner10]

there is an E on the cover if the ecu in the bottom right, regular turbo ecus hace the T there. if it is eprom what is the part number?

and what IM is that?

[mysticj]

I believe it's 96-98 Sonata.



If you are using that Sonata head, then your compression should be around 10:1. If you milled the head, you can reach 10.5:1.