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2G 420a to SRT4

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Culon1997GS

Proven Member
99
13
Sep 22, 2023
Laredo, Texas
hello guys, yesterday my car broke down, and while I was at the shop, I was talking to my mechanic and he suggested that i should do an SRT4 swap to my eclipse gs, is it really worth it? keep in mind that this is my first car, im 19 yo, i know its easy to say just to get a 4g63T, but they are like 20k at least where i live
 
The srt4 engine swap requires you to

-Custom fab a passenger side motor mount

-Rotate the pistons 180 degress on the rods due to the cylinder head being on "backwards" on the 420a engine and the dome which resembles a ski ramp on the srt-4 will contact the 420a head if they are not flipped.

-You also have to get a 2.4 engine block/crank from an 02 or earlier car (PT cruiser, dodge stratus, chrysler minivan ect) because the srt-4 block uses and NGC controller for the crank position and will not work with the 420a computer. You could also strip the harness/ecu from an SRT-4 or go with a standalone engine management system. The neon guys that did the swap back in the day used to have a trigger plate that went on the harmonic balancer but you have to find one used since they're not made anymore

-You'll have to re-wire the injectors since the 2.0 computer goes off of #1 cylinder and the 2.4 goes off of the #2 cylinder so they all have to move one position over in the wiring harness. The spark plugs wires also have to be swapped

There are a bunch of other little things that have to be done as well like blocking off some oil drain backs but I believe those were all the "large" issues I remember from when I did my swap. If you do move forward with the swap I can help you with most the mechanical question you have but won't be of much help on the tuning side of things. You'd have to go to the neon forums for that and their .org site is pretty much vacant and dead.

Since its a turbo swap you may just go straight to megasquirt for tuning. That will allow you to use the SRT-4 block rather than having to source an earlier one. You can also find turbo 2.4 engines in the PT cruiser "GT" models which are the exact same engine as the SRT-4 and normally easier to find
 
The srt4 engine swap requires you to

-Custom fab a passenger side motor mount

-Rotate the pistons 180 degress on the rods due to the cylinder head being on "backwards" on the 420a engine and the dome which resembles a ski ramp on the srt-4 will contact the 420a head if they are not flipped.

-You also have to get a 2.4 engine block/crank from an 02 or earlier car (PT cruiser, dodge stratus, chrysler minivan ect) because the srt-4 block uses and NGC controller for the crank position and will not work with the 420a computer. You could also strip the harness/ecu from an SRT-4 or go with a standalone engine management system. The neon guys that did the swap back in the day used to have a trigger plate that went on the harmonic balancer but you have to find one used since they're not made anymore

-You'll have to re-wire the injectors since the 2.0 computer goes off of #1 cylinder and the 2.4 goes off of the #2 cylinder so they all have to move one position over in the wiring harness. The spark plugs wires also have to be swapped

There are a bunch of other little things that have to be done as well like blocking off some oil drain backs but I believe those were all the "large" issues I remember from when I did my swap. If you do move forward with the swap I can help you with most the mechanical question you have but won't be of much help on the tuning side of things. You'd have to go to the neon forums for that and their .org site is pretty much vacant and dead.

Since its a turbo swap you may just go straight to megasquirt for tuning. That will allow you to use the SRT-4 block rather than having to source an earlier one. You can also find turbo 2.4 engines in the PT cruiser "GT" models which are the exact same engine as the SRT-4 and normally easier to find
did you do an SRT4 swap?? or how do you know all that stuff OMG
 
I've done a 2.4 non turbo swap for a circle track 2g that I used to have. The car in my profile/avatar pic is actually the car that I did it on. You can see the timing belt cover and head sit higher than the 2.0 420a does. (Still cleared the hood without any issue tho)
 
I've done a 2.4 non turbo swap for a circle track 2g that I used to have. The car in my profile/avatar pic is actually the car that I did it on. You can see the timing belt cover and head sit higher than the 2.0 420a does. (Still cleared the hood without any issue tho)
thats a clean engine bay! was it worth it tho? i wanna do the 2.4L T swap, how much should i expect spending on it?
 
honestly your best bet is to find a donor car for the swap or build your 420 and go turbo, ive heard you can safely run 7psi on stock internals (9 at most) otherwise its gonna be about $1100 for rods and pistons
 
honestly your best bet is to find a donor car for the swap or build your 420 and go turbo, ive heard you can safely run 7psi on stock internals (9 at most) otherwise its gonna be about $1100 for rods and pistons
yeah ive heard that, my mechanic charges me like $1200 to install me a T28 eagle talon turbo, intercooler, bov and all the piping, he has those parts in his shop, and he told me 1200 for all, installation included, and he said ill be running 8psi safely, since it is my DD, but i want it purely for sounds tbh, not trying to go fast unless i SRT4 swap it
 
thats a clean engine bay! was it worth it tho? i wanna do the 2.4L T swap, how much should i expect spending on it?
I did it about 2017 so I can't really say what the price would be now. I bought an n/a engine from the junkyard and arc welded the custom motor mount that had to be made. The engine was like 250 bucks and I used srt4 rods with n/a pistons on them. The srt4 rods were like 75 bucks for a set. So my costs were pretty low. Maybe 500 bucks into it all said and done.

I didn't have the 2.0 to compare it to. I got the car with a hole in the side of the block. It wasn't a big fan of high rpm. Since you'd be turbo you would see a big difference over the n/a 2.0. Most neon guys do the srt4 swap instead of turboing the 2.0 so I would have to guess that the 2.4 srt4 has advantages over the 2.0.

My biggest thing I didn't like about the swap was having the pistons in backwards. The wrist pin on pistons are offset for thrust angle so putting them backwards will cause a lot of wear over long term use.
 
I did it about 2017 so I can't really say what the price would be now. I bought an n/a engine from the junkyard and arc welded the custom motor mount that had to be made. The engine was like 250 bucks and I used srt4 rods with n/a pistons on them. The srt4 rods were like 75 bucks for a set. So my costs were pretty low. Maybe 500 bucks into it all said and done.

I didn't have the 2.0 to compare it to. I got the car with a hole in the side of the block. It wasn't a big fan of high rpm. Since you'd be turbo you would see a big difference over the n/a 2.0. Most neon guys do the srt4 swap instead of turboing the 2.0 so I would have to guess that the 2.4 srt4 has advantages over the 2.0.

My biggest thing I didn't like about the swap was having the pistons in backwards. The wrist pin on pistons are offset for thrust angle so putting them backwards will cause a lot of wear over long term use.
did you swap it? or did you paid for it?
 
Will your mechanic do the fuel management needed for it, too? The engine is basically a grenade with the pin pulled if fuel is not addressed, and I can pretty much guarantee it isn’t at $1200.
 
I did it about 2017 so I can't really say what the price would be now. I bought an n/a engine from the junkyard and arc welded the custom motor mount that had to be made. The engine was like 250 bucks and I used srt4 rods with n/a pistons on them. The srt4 rods were like 75 bucks for a set. So my costs were pretty low. Maybe 500 bucks into it all said and done.

I didn't have the 2.0 to compare it to. I got the car with a hole in the side of the block. It wasn't a big fan of high rpm. Since you'd be turbo you would see a big difference over the n/a 2.0. Most neon guys do the srt4 swap instead of turboing the 2.0 so I would have to guess that the 2.4 srt4 has advantages over the 2.0.

My biggest thing I didn't like about the swap was having the pistons in backwards. The wrist pin on pistons are offset for thrust angle so putting them backwards will cause a lot of wear over long term use.
should i get a junkyard engine as well? I saw one on ebay which i believe was 74k ish miles, and it was like $3.4k (SRT4) turbo included
 
yeah ive heard that, my mechanic charges me like $1200 to install me a T28 eagle talon turbo, intercooler, bov and all the piping, he has those parts in his shop, and he told me 1200 for all, installation included, and he said ill be running 8psi safely, since it is my DD, but i want it purely for sounds tbh, not trying to go fast unless i SRT4 swap it
No. There is no way you will get a good install for 1200. I hate to call you out and I apologize but I am going to do so. It's your first car, you're 19. Just do maintenance and enjoy it. You have to walk before you can run. If you happen to be a seasoned mechanic this would be a different story. One of my sons is 19 and he has the same dreams as you. He got stumped changing a muffler and he has 2 years votech and ASE certification. Please, have dreams, have fun, ask questions but be realistic. For the money to do some of these swaps you could simply buy a faster car. If you're doing it yourself that's different.
 
No. There is no way you will get a good install for 1200. I hate to call you out and I apologize but I am going to do so. It's your first car, you're 19. Just do maintenance and enjoy it. You have to walk before you can run. If you happen to be a seasoned mechanic this would be a different story. One of my sons is 19 and he has the same dreams as you. He got stumped changing a muffler and he has 2 years votech and ASE certification. Please, have dreams, have fun, ask questions but be realistic. For the money to do some of these swaps you could simply buy a faster car. If you're doing it yourself that's different.
thanks for being honest, i like that you told me what i needed to hear and not what i wanted to hear, how much is a good install?
 
Will your mechanic do the fuel management needed for it, too? The engine is basically a grenade with the pin pulled if fuel is not addressed, and I can pretty much guarantee it isn’t at $1200.
i could ask him, he has a 1997 eagle talon tsi, so i guess he was planning on it, he does engine swaps, trannys swaps, and he's currently swaping his turbo to a bigger one, thats why he's like you can have it, i dont need it no more, since he's like my "friend"
 
should i get a junkyard engine as well? I saw one on ebay which i believe was 74k ish miles, and it was like $3.4k (SRT4) turbo included
If you aren’t an expert at wiring, please do not try the SRT swap, it will not end well. This engine was not meant for this chassis and is a very complicated conversion, as pointed out.

thanks for being honest, i like that you told me what i needed to hear and not what i wanted to hear, how much is a good install?
$5,000 minimum done right if you can’t do work yourself, which will take you to 225-250 hp safely. I agree with the above, you are in way over your head with this and you should not be considering swapping or turbocharging. We’re not here to insult you, but to save you from wasting a lot of cash on a project that will inevitably fail to meet your expectations (or work at all).
 
If you aren’t an expert at wiring, please do not try the SRT swap, it will not end well. This engine was not meant for this chassis and is a very complicated conversion, as pointed out.


$5,000 minimum done right if you can’t do work yourself, which will take you to 225-250 hp safely. I agree with the above, you are in way over your head with this and you should not be considering swapping or turbocharging. We’re not here to insult you, but to save you from wasting a lot of cash on a project that will inevitably fail to meet your expectations (or work at all).
thanks for letting me know, i really really appreciate it, so, should i only do maintenance and forget about boosting it for now?
 
I told my son if he wants to increase enjoyment focus on aesthetics and suspension mods. If you can afford it do not cheap out on tires. Good tires makes the car much more enjoyable with no knowledge required.
I had the exact same dreams as you at 18, 19. I lowered a mini truck at 20. I bought my first turbo talon at 23. I'm 54 now.
 
I told my son if he wants to increase enjoyment focus on aesthetics and suspension mods. If you can afford it do not cheap out on tires. Good tires makes the car much more enjoyable with no knowledge required.
I had the exact same dreams as you at 18, 19. I lowered a mini truck at 20. I bought my first turbo talon at 23. I'm 54 now.
what is a good price for tires? and what makes more expensive tires a lot more enjoyable? thanks for sharing your experience with me, i hope one day i could orientate younger people just like you did with me today, thank you sir:thumb:
 
what is a good price for tires? and what makes more expensive tires a lot more enjoyable? thanks for sharing your experience with me, i hope one day i could orientate younger people just like you did with me today, thank you sir:thumb:
I guess better isn't quite the right term. I mean more performance oriented. The trade off is they are softer so they wear faster and are generally more expensive. Your needs and budget come into play. I wear dry dedicated tires but that's not practical for everybody. A name brand high performance all season is good but will wear faster than a "passenger" tire. Some of the best I've experienced are Michelin pilot series but there are many good others. I've had many. Nitto, Falken, Dunlop, Goodyear, bridgestone, toyo. All make something suitable. Like I tell my son with age comes privilege. Price is not the only factor. Size plays a part there as does brand and type. My tires are in the 250$ each range for 235/45/17.
 
yeah ive heard that, my mechanic charges me like $1200 to install me a T28 eagle talon turbo, intercooler, bov and all the piping, he has those parts in his shop, and he told me 1200 for all, installation included, and he said ill be running 8psi safely, since it is my DD, but i want it purely for sounds tbh, not trying to go fast unless i SRT4 swap it
that honestly sounds like a good deal but i would just run like 6psi on 93 octane unless you have a way to tune your ecu or get a standalone because our cruddy cast pistons don't handle knock well, still its your build just have fun
 
that honestly sounds like a good deal but i would just run like 6psi on 93 octane unless you have a way to tune your ecu or get a standalone because our cruddy cast pistons don't handle knock well, still its your build just have fun
sorry for late response, and yes, he told me that i should be running 8 psi safely, since the car that i have has been rebuilt from ground up by him, and he told me he replaced every gasket in the engine, so i should be fine, but i dont have a way to tune my ecu unfortunately
 
sorry for late response, and yes, he told me that i should be running 8 psi safely, since the car that i have has been rebuilt from ground up by him, and he told me he replaced every gasket in the engine, so i should be fine, but i dont have a way to tune my ecu
Safety with turbochargers isn’t focused on the condition of the engine itself, but the ability to control the combustion of the air/fuel mix entering the engine. It’s not possible to run safely without tuning the ECU, the stock 420A ECU simply is not able to understand when a turbocharger is forcing air into the engine. At 8 psi, the engine will be taking in nearly double the amount of air and won’t be adding any fuel to compensate for that. Injecting small amounts of fuel for large amounts of air is called “running lean”, and is going to destroy your engine almost immediately. Google the term “lean detonation” and you’ll see the effects.
 
Safety with turbochargers isn’t focused on the condition of the engine itself, but the ability to control the combustion of the air/fuel mix entering the engine. It’s not possible to run safely without tuning the ECU, the stock 420A ECU simply is not able to understand when a turbocharger is forcing air into the engine. At 8 psi, the engine will be taking in nearly double the amount of air and won’t be adding any fuel to compensate for that. Injecting small amounts of fuel for large amounts of air is called “running lean”, and is going to destroy your engine almost immediately. Google the term “lean detonation” and you’ll see the effects.
what do you think about this? im chatting with the mechanic and he told me that "dont worry about that, you are gonna run it like that low boost dont need al that stuff, thats for big turbo set ups so you arent lagging and stuff"
 
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