Have a 99 GS Eclipse I want to put a turbo on from say hahnracecraft. People have been telling me to start with a 4g63 block and build it up from there as they are stronger. Would like to just build my 420a, but just curious which is better and where could I get a 4g63 block that is built to start building up from that is fairly new? Thanks, Dan.

The 4g63 is a mitsubishi motor that came in the turbo eclipses. The 420A is a chrylser motor that came in our cars. Notice that our engines sit on the left side of the engine bay (looking from the front of the car). 4g63 engines sit on the right side of the engine bay. In my opinion, theres no point of even trying to build up a 4g63 block. They are not in our cars, and to swap one into a nonturbo eclipse would cost thousands of dollars. Im not even gonna get into what you would have to buy to actually make a conversion possible, but its very expensive and not worth while.

Although its true that a 4g63 block is more durable and can handle plenty of boost out of the factory, the 420A engine is a good engine as well. If you want to go turbo, all you need to do is buy the turbo kit (hahn or star or custom). That will allow you to run from 6 to 10 psi, based on what stage kit you buy. Our engines will not handle more than 10psi of boost safely, because they were not designed for boost. Youd need to rebuild your bottom end (pistons, rods, etc.) so that you can handle the boost. But even at 6psi, you should be creating somewhere near 200-215 hp at the crank, which is a good number. 10psi should put you somewhere near 270hp at the crank.

Overall, dont try to swap engines, its not a worthwhile effort. Look into buying a turbo kit and redoing your bottom end, or buying a built 420A block from howell. Hope this helps.

NeoVB
2005 Subaru Impreza 2.5RS
1997 Mitsubishi Eclipse GS TURBO
1995 Mitsubishi Galant ES DOHC TURBO
1991 Eagle Talon TSI AWD

If both are built with forged internals, the 420A is newer and more efficient...period. the biggest advantage the GST/X guys have over us is their ECU, IMO.

www.TeamKLR.com
1997 Silver RS
12.3@118mph,20psi, race gas(drag radials)
Wiseco 10.5 Pistons
Eagle Rods
T3/T4 Turbo
Custom FMIC
Greddy Exhaust
440's

Cool, thanks a bunch for your help. Is there a place to order a new block from then for the 420A, so I can build one without my car being down? I have been looking on Hahn Racecraft for a while, but my roommate with a Supra was telling me other information. Cool, I will go with my original idea of building my motor up by doing the bottom end then. Guess I will just let my car be down for a while or see if I can find me a new block. Thanks again, Dan.

yeah from http://www.howellautomotive.com/

2006 WW IX MR
2003 BBY EVO VIII (sold)
256.9WHP & 277.9torque
http://s90395832.onlinehome.us/forum//index.php?sid=a70942a7f65043e6c873e12dcd300692

1998 Eclipse RS --show car--

I"m thinking of going over to teh other side: selling my GS and buying a GST/X because i'm figuring its cheaper than putting on 5psi and having to build the bottom end in 25k. Do you guys know what kinda boost the 4g63T is running stock? And is there any way possible to see if a used car is developing crankwalk?

thanks,
matt

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Black 98 GST missing her owner and looking for a new one...Inquiries welcome

Any car can get crankwalk but 2G I hear got a 50% chance or something like that. Even if you get it you can just drop a 1G motor in your 2G which is what a lot of my friends have done around here. Cost less to buy a drop in a 1G 4G63 in a 2G then it does to build a 420A. I think stock boost is 12psi but I might be wrong. Got friends running 16-17psi on stock turbo but once you get to that point its time to upgrade to a 16G or bigger w/ fuel mods. Also, some people on here have been running a stock bottom end for a long time, like Corbin who just hit three years but others like myself have had bad luck and drove maybe 3K miles. Its all in tuning, how hard you push your car, compression before you go turbo and some luck to.
-Dave

2009 Corolla S - waiting until 2012 for my next toy!
*SOLD* 1992 3000GT VR4 - pearl white and 45,6xx miles!
*SOLD* 2007 Subaru Legacy GT sedan
*SOLD* 95 Mitsubishi 3000GT VR4 - BPU
*SOLD* 97 Eclipse GS Star Stage 2

well we need to clear some things up it sounds like...to begin w/ stock for stock the 4g63 engine is much better, i hate to say it but it is...the pistons and rods are obviously much stronger b/c of it being boosted stock..plus if youve seen the ports of both engines the 4g63 is way bigger..but you can do some porting and polishing work to the engine and make them equivelant...they don't have to change anything to their engine internal wise to run high boost...but the 2gs do have to worry about crankwalk....almost everyone of them in my club has got crankwalk sooner or later...they have stuff to prevent it but most of the time it happens...and putting in a 1g engine is possible but a huge pain in the ace, we have one guy in our club who did it and it was an experience from what i'm told....w/ internals and porting work our engine is every bit as good as a 4g63, we dont have to worry about crankwalk either...i have walked a few guys w/ turbos in my club, its not hard w/ the right tuning and enough boost..to tell you the truth its easier to see higher gains in the factory turbo b/c the engine and ecu is made for it..slap on a big turbo, injectors and some form of piggy back (afc) and your good to go...thats 1500 compaired to the 3k for a kit, and 1500 for rebuild that we have to do...dont forget about the fwd vs awd con for the gsx owners....we have the sleeper factor though, no one expects us to wax that ass b/c it looks like a nt, plus our insurance co's dont rape us in premiums as much as they would w/ the factory turbo..each has pros and cons...our engine is very capable though

400whp or bust.

So your saying with a little work the 420A can be just as good as the 4g63 and not have to worry about crank walk? Would cams help our car as I heard many turbo cars putting the 420A cam in theirs? Still only found crate motors to order and not just a block to build my own engine from. I heard fuel cut-off from our computers is the worst, but can get a fuel computer to elimate that problem. Man I didn't realize that these cars where so different between each model. Thanks

Also dont forget that IF you were to buy a GST/GSX, it would run you about 2000$ more than a GS or RS. So there goes your turbo kit

I say the thing that limits the 420A is the fact that it uses a MAP sensor and it ECU. Its obvious that the Karman sensor type is much more suited towards boost than MAP. Plus the fact that our ECU freaks out if it reads any sort of boost, and even if a hacked MAP is used it still freaks out with timing and ignition.

I think if someone made a ECU/Sensor combo pack which replaced the MAP sensor with a Karman, and redid the ECU to actually see boost and like it, we would be in the clear. But that would probably cost wayyyy too much for anyone to actually buy it. Or at least modify our existing ECU to be more lenient with boost.

Thats my .02 cents

And yes, you can measure crankwalk. Any mechanic with knowledge in DSMs can help you out. Youd have to bring him along and hed have to get under the car, but they can measure the amount of play in the crank and see if it is out of spec. Also if you test drive a GST/GSX that has bad crankwalk, when you make left turns the clutch should stick to the floor. Safest bet is to bring a mechanic along to look at the cars with you, and get a warranty with the car

NeoVB
2005 Subaru Impreza 2.5RS
1997 Mitsubishi Eclipse GS TURBO
1995 Mitsubishi Galant ES DOHC TURBO
1991 Eagle Talon TSI AWD

yes w/ some work the 420a is a very good motor and can take the same abuse....the head would definately benefit from cams if your going turbo b/c it will help spool a lot better than our stockers..the map is not the downfall of our computer jsut that the computer isn't made to read anything above atmospheric..i actually like the map sensor much better than the mas b/c its reading whats in our manifold as opposed to something that can be lost before it gets there, ie bov or boost/vacuum leak...if our ecu would do timing retard like the turbos do it would be awsome and we wouldn't need to work around it..but to make a 420a as fast as a gst takes more money..not to mention the fact that we can't really upgrade our tranny like they can which is gay...i love my car and being boosted but to be as fast as my buddy w/ a tsi i have spent easily twice as much as he has...on stock internals w/ a 16g hes running 18psi...impossible to do w/ our stock internals..this has been proven...our engine is great , if you have the money and time boost it, it responds so well to boost..but expect to pay much more to get results

400whp or bust.

Yeah I love my 2gnt, and I hate to say it, but a GST/X is only about 2 grand more for 12 psi of boost over 5psi on the 420a, and the engine is made for boost over ours...if it wasn't for that damn play in the cranks...

matt

---------------------------------------

Black 98 GST missing her owner and looking for a new one...Inquiries welcome

Remember though, that thier 12psi of boost is equal to our 6psi. Gotta love higher compression

NeoVB
2005 Subaru Impreza 2.5RS
1997 Mitsubishi Eclipse GS TURBO
1995 Mitsubishi Galant ES DOHC TURBO
1991 Eagle Talon TSI AWD

hey so how much will 10psi on our high compression equual to them ???

heheheheh

DsM Power Soon to be turbo yahhhhhh

Our higher compression is one thing, but the S16g or the T3/T4 turbos flow more air per pound of boost than the stock T25 turbos that the GST/X come with. That means that we make more HP per pound of boost over the T25 at the same boost level. The 420A is a sweet engine. After rebuilding and assmebling my engine, its really a damn good design. Very simplistic also.

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
My webpage: http://eclipsed4evr.home.comcast.net
-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)

well again, don't forget that the insurance that they pay is double that of ours... well in my case it would be. i'm in NYC and at 20yrs old i would be paying close to 5k a year for a gst/x. so add the higher insurance to the higher initial price of the car, and you'll probably come out about even(after doing turbo/bottom end) if not be paying less b/c every year you pay out half as much as them.

- Dan

HRC Stage 2|30lb injectors|S-FMU|Walbro255HP|AFX UDP|B&M Short Shifter w/ Symborski Shift Kit|Rear Strut Bar|Power Slot Rotors|more...

my insurance is $480.00 for 6 months....it in my moms name but we wont talk about that


95 gs-t
6 bolt swap
T-2small turbo
15 Psi
Joe P mbc
Greddy uip
Greddy lip
Greddy bov
Supra smic
Borla cat back exhaust
Gutted cat