automatics rev higher than the manuels

[14.5 drift]

http://autos.msn.com/research/vip/spec_engines.aspx?modelid=2106&trimid=-1&src=vip#eng_tran


So I was snooping around on msn and happened upon some information about the eclipse that was very interesting.

It seems that there are two different 4g63t's that come in the eclipse's through 97, 98, and 99, one that came in the manuel with a 3.35 X 3.46 bore and stroke rated @ 210hp @ 6000 RPM and 214tq @ 3000 RPM

Then, there is the other onefound only in the automatics with 3.50 X 3.07 bore and stroke rated @ 205hp @ 5750 RPM and 209tq @ 2200 RPM.

As you can see the automatic is destroked by nearly half an inch, giving it way more potential for high revs, heads willing. Just for fun i looked up the stroke on the high revving s2k, only to find it stroked identically to the manuel 4g's.

Then I had a light bulb, and realized, damn, it's time for me to get some head work done, with that short of a stroke, the potential to wind that thing up to 10,000 rpm's was absolutely possible. At 10,000 rpm's piston speeds would still be lower than that of the s2k so it was only the heads that were holding this 4g back. All I would need to do was build the shit out of my head, strap on an fp3052, and damn, and wind that bish out.

Then I realized that i had a 96, and none of this was available for me.

Oh well, posted it any way for other automatic guys who were 97 -99, but maybe this is old news, who knows?.

 

[asexton6969]

wow i never knew that. Thnx for pointing it out. Im automatic but im a 1996 too....o well.

 

[kpt4321]

Not old news, just incorrect news.

The 4G63's in all the turbo DSM's are the same bore and stroke.

 

[JiveMasterT]

Not old news, just incorrect news.

The 4G63's in all the turbo DSM's are the same bore and stroke.

why would they say that on the website then? im so confused.

 

[14.5 drift]

Wow! It also says compression is set to 9.2:1

Was looking at the ratings and wasn't sure how with less stroke it had more tq earlier in the power band

 

[blitz43]

dang wells im an auto 95 GS-T

 

[14.5 drift]

Not old news, just incorrect news.

The 4G63's in all the turbo DSM's are the same bore and stroke.

Just called mitsubishi, they had no clue about any thing,

parts was like service should know, then service was like, let me transfer you to parts



Then I asked for a reliable source to find specs of this nature, he was like I have no idea




:laugh: :laugh: :laugh:

 

[kpt4321]

Then I asked for a reliable source to find specs of this nature, he was like I have no idea

Try the factory manual, which says that all the 4G63's are the same. 3.35 & 3.45, all of them.

You know that the two engines you made up don't have the same displacement, right?

 

[kpt4321]

why would they say that on the website then? im so confused.

I don't know, it's wrong.

 

[14.5 drift]

Try the factory manual, which says that all the 4G63's are the same. 3.35 & 3.45, all of them.

You know that the two engines you made up don't have the same displacement, right?

Wrong!!! I never made up shit. Click the link and there you will see the stats for yourself.

 

[DSMeclipse4G63]

stock bore on 4g63 engines from 1990-1999 is bore:3.35 stroke 3.46. compression ratio 8.5:1 auto or manual(on 2g, 1g 7.8:1 for n/t and turbo). This all goes for any 4g63 even the 1g n/t, the ratio changes obviously.

About the auto with different power ratings you are right on the hp and the fact that they have different outputs then manual dsm's. The actaul is 205hp and 220tq, and its not because of a different turbo and cams like 1gs, it has only to do with gear ratios and final drive and Im guessing tune. So your on the right track, but the 4g63 with the right setup can spin to 9k(given the valve springs,a dn lower end are willing and up to the task), but with an aging engine valve springs loose alot of tension and begin to float ont the high rpms. So to agree with you to a point with upgraded springs and a well maintained and broken into motor I would say 9k shouldnt be too bad on a 4g63, but thats if you have a turbo thatll be effiecent at the range.
Andrew

 

[14.5 drift]

After about an hour of searching for any link to the different stroke motor, I came up with didley, and although I drive a 96 some how I got a 97 manuel with the car that confirms what kyle said, all 4g's had the same bore and stroke.

Some one should email msn and tell them there shit is off, I would myself but i give up on this one

 

[Eliteracingghmi]

When it comes to DSM info, stick to the DSMers. Are you going to listen to some punk reporter or your boys from DSMtuners.com who know there stuff?

 

[igs]

If the auto and manual engines are the same, why do they have different power and torque ratings?

 

[4G63luvr]

I've always been under the impression that from 95 on, it was next to impossible to put in a 4g63, I thought every 2G came with a 420a. Now what the hell is going on?
chris

 

[CanadianTSi]

I thought every 2G came with a 420a. Now what the hell is going on?
chris

95-99 NON-TURBO's come with a 420a

 

[leakyfaucet]

I've always been under the impression that from 95 on, it was next to impossible to put in a 4g63, I thought every 2G came with a 420a. Now what the hell is going on?
chris

For being a 4G63luvr, you sure don't know much about them

Just kidding.

 

[My96AWD]

If the auto and manual engines are the same, why do they have different power and torque ratings?

cams are different.

 

[RuBiCaNT5X]

cams are different.

ONLY in 1G's... 2G AT and MT have the EXACT same Turbo, Cams, Exhaust Manifold and Injectors... It is a mystery why they rated thier crank hp numbers different.. Here is what I've heard..


MT 2G
210hp
214ft/lbs

AT 2G
205hp
220ft/lbs

 

[kpt4321]

I would not be surprised if the fuel and timing maps were slightly different, and possibly the boost control map. That could easily make the difference.

 

[Tallen]

why would they say that on the website then? im so confused.

I once read that bigfoot was an alien spy....DONT BELIEVE EVERYTHING YOU READ ON THE INTERNET.

ONLY in 1G's... 2G AT and MT have the EXACT same Turbo, Cams, Exhaust Manifold and Injectors... It is a mystery why they rated thier crank hp numbers different.. Here is what I've heard..


MT 2G
210hp
214ft/lbs

AT 2G
205hp
220ft/lbs

Thats one of those general mysteries. I noticed this awhile ago, and theres really no explanation unless they confused the #'s with 1G A/T and M/T.

 

[RuBiCaNT5X]

I once read that bigfoot was an alien spy....DONT BELIEVE EVERYTHING YOU READ ON THE INTERNET.


Thats one of those general mysteries. I noticed this awhile ago, and theres really no explanation unless they confused the #'s with 1G A/T and M/T.

On the contrary, the 1G AT and MT were rated the EXACT same for HP and Torque specs, AFAIK...

 

[4G63luvr]

so your saying that there are NO stock turboes 420a. All turbo eclipses have a 4g63 in them? I guess I learn something every day. Hmmm, I learn something new every day. So hypathetically, you could swap in a 4g63t in place of the n/a 420a? interesting.
christopher

 

[JiveMasterT]

so your saying that there are NO stock turboes 420a. All turbo eclipses have a 4g63 in them? I guess I learn something every day. Hmmm, I learn something new every day. So hypathetically, you could swap in a 4g63t in place of the n/a 420a? interesting.
christopher

you could, but its not even worth the time and money... the engine and tranny mounts are opposite, and its just not worth it. just get a turbo car from the factory.

 

[saw wave analog]

every single turbo dsm from the factory is running the 4g63, there was never a turbo 420a as stock, its a neon engine. 1g autos are weaker than the manuals in several ways, but for the 2g the engines mechanically are identical.. whether or not there is a slight difference in tune is unknown to me, but seems very possible.