Hey everybody my friends have been talking to me about turboing my eclipse so I figured I'd ask you guys about. I'll list my questions out and hopefully get some responces that will help me understand this . We're going to pull apart saturday and we're going to look for a 4g63 engine and pull it if it looks to be in good shape.

Are the stock internals different from the N/A to the 4g63? Because my friend brought up an idea to just take the manifold, turbo, downpipe, and ecu and swap it onto my car.

What I was orginally going to do was just pull the 4g63 out and rebuild it from the bottom up and swap it into my car. In which case what else do I need? we plan on doing the work ourselves, my friends have hella garage equipment, from tools, lifts, stands, computers etc.

I just sort of figured that I can get a engine from pull apart for 350 and rebuild it, since my intentions of buying a gst spyder fell through. If anyone has a good in depth walk through of everything and how to do everything or if what I had stated about just taking the parts off and swapping it and upgrading the internals would work please share.

Thank you

You can't switch the stuff off of the 4G63 to your 420a it won't work that easy or everyone would be doing it. You also can't just get a 4G63 and swap it into your car because the motor mounts are different. Your best bet is just actually building your 420a motor and turboing it. It's not gonna be a cheap process though.

MaKaPhiLLy said:

You can't switch the stuff off of the 4G63 to your 420a it won't work that easy or everyone would be doing it. You also can't just get a 4G63 and swap it into your car because the motor mounts are different. Your best bet is just actually building your 420a motor and turboing it. It's not gonna be a cheap process though.

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A non-turbo spyder has the 4G64, not the 420a. The 4G64 is easily turbo'ed. There's also a quite detailed write-up on it.

What year is the spyder? 97 is a little more complicated, but the 98-99 if much easier to turbo.

MaKaPhiLLy said:

You can't switch the stuff off of the 4G63 to your 420a it won't work that easy or everyone would be doing it. You also can't just get a 4G63 and swap it into your car because the motor mounts are different. Your best bet is just actually building your 420a motor and turboing it. It's not gonna be a cheap process though.

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You should delete this comment.

The head has same flanges. Yes you can bolt it up. The internals of are 4g64 are just as,strong as 63s. They have made it to 400+ hp. You should get dsmlink.

Also the 64 auto is diff from.the 63 auto I think. So dont know the matchup btwn trans or how strong they are.

MJcanada said:

The head has same flanges. Yes you can bolt it up. The internals of are 4g64 are just as,strong as 63s. They have made it to 400+ hp. You should get dsmlink.

Also the 64 auto is diff from.the 63 auto I think. So dont know the matchup btwn trans or how strong they are.

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I have a question that would pertain to him just as much as me(in the process of gathering the parts for 4g64 turbo) I see people saying that the 64 cant handle much more than 250-300 Hp and not to go over 8psi, then i see people saying that the engine can handle almost as much as the 4g63 and run 16g at 18psi. Its getting very confusing who to believe -__-

But to the OP there is a very good website about the process to turbo the 4g64 which is actually quite simple and almost all the parts and be pulled from a 4g63 and swapped over except a few that would need to be modified. Here is the link 4G64 Performance - Mitsubishi Eclipse Spyder GS

Viper588 said:

I have a question that would pertain to him just as much as me(in the process of gathering the parts for 4g64 turbo) I see people saying that the 64 cant handle much more than 250-300 Hp and not to go over 8psi, then i see people saying that the engine can handle almost as much as the 4g63 and run 16g at 18psi. Its getting very confusing who to believe -__-

But to the OP there is a very good website about the process to turbo the 4g64 which is actually quite simple and almost all the parts and be pulled from a 4g63 and swapped over except a few that would need to be modified. Here is the link 4G64 Performance - Mitsubishi Eclipse Spyder GS

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The Evo8 turbo conversion kit on my car was came off a spyder gs. It made over 400awhp on the stock 64 at 22psi. It lasted quite a long time till a rod bolt broke.
Another friend of mine had a evo8 kit on his 2g gst stock 63 and idk what he made but end result was a broken rods bolt.
So you see both 63/64 stock blocks are pretty much equal in stock form.
I believe the rod bolts broke due to the down low torque made as the spyder seen 20psi by 3k and the gst seen 10psi by 2.5k.

GST2012GSX said:

What year is the spyder? 97 is a little more complicated, but the 98-99 if much easier to turbo.

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Can you elaborate on that? Why is a 97 more complicated then the 98-99?

Viper588 said:

I have a question that would pertain to him just as much as me(in the process of gathering the parts for 4g64 turbo) I see people saying that the 64 cant handle much more than 250-300 Hp and not to go over 8psi, then i see people saying that the engine can handle almost as much as the 4g63 and run 16g at 18psi. Its getting very confusing who to believe -__-

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The 4g64 uses the exact same rods as the turbo 7-bolt, has a hardened steel crank, and uses pistons very similar to the 7-bolt's. The biggest issue is the higher compression ratio which invites more knock when using pump gas. That's the reason for the "8psi" limit, which is actually a very poor rule of thumb considering PSI has nothing to do with horsepower and very little to do with stress on the engine. But like MJ said, the 4g64 has been pushed nearly as far as the 4g63. With proper tuning the stock 4g64 can easily handle 350hp+.

SlowSpyder said:

Can you elaborate on that? Why is a 97 more complicated then the 98-99?

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WES_393 said:

The 4g64 uses the exact same rods as the turbo 7-bolt, has a hardened steel crank, and uses pistons very similar to the 7-bolt's. The biggest issue is the higher compression ratio which invites more knock when using pump gas. That's the reason for the "8psi" limit, which is actually a very poor rule of thumb considering PSI has nothing to do with horsepower and very little to do with stress on the engine. But like MJ said, the 4g64 has been pushed nearly as far as the 4g63. With proper tuning the stock 4g64 can easily handle 350hp+.

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Thank you both for the info! In the end i don't plan on making anywhere near that, aiming for 220-250, glad to hear it can handle more if done right!

Viper588 said:

Thank you both for the info! In the end i don't plan on making anywhere near that, aiming for 220-250, glad to hear it can handle more if done right!

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You can make that with a t25 or 14b no problem.

MJcanada said:

You can make that with a t25 or 14b no problem.

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yea i have a 14b waiting =)

Just dont forget to put a knock sensor and I will highly recomend a wideband!

GST2012GSX said:

Just dont forget to put a knock sensor and I will highly recomend a wideband!

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Wide band is deff on the list, the knock sensor im going back and forth about. To make the 220-250 im looking for it looks like i wont have to swap to the turbo ECU and can just keep the stock, but i lose the knock sensor support, better timing maps etc. Ive changed my mind several times about whether to just do the ECU swap or just stick to the stock for now then swap it later.

Thank you for the replies so we would be able to take the parts off of the 4g63t and swap them onto my 4g64 correct its pretty early just making sure I understood that correctly. And I dont really plan on getting it passed 250hp, it sits real low and the roads here suck. I just miss the Psshhh .

What parts are you talking about exactly? Do you mean Mani, turbo, injectors? Or are you talking engine internals?

the manifold, turbo, downpipe, and ecu, new injectors with the resistor pack. I honestly think just pulling the engine out and swapping the 4g63t in would be easier

Easier, but not as rewarding. I'm thinking about grabbing a junkyard 4g64 to throw into my gst for more torque. And you will definitely want that with your a/t, trust me. My auto talon is gutless until I hit 10 psi, and then its like strapping yourself to a rocket

For 250-300hp 550 cc Injectors should do. Get some high impedance injectors and you won't need to wire in the resistor pack. Oh and by the way your not gonna stop at 250-300hp, trust me.

Lol. Trust me 250- 300 is all I need, my car stands out way to much, and cops love meh. I'd love to put more but if I do I'll lose my lisence .