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4G Eclipse GS/SE Specific 2.4L I4 (4G69) Specific Forum


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Old June 24th, 2008, 09:19 PM   #1 (permalink)
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found out some infor for us 4 banger guys/gals

I had some free time today and decided to do some research. I've come up with the following:

4G69 uses 4G63 rod and crank bearings (old news)
4G69 uses 4G64, 4G94 valve guides and seals
4G69 uses the EVO timing belt tensioner which is aluminum, not cast iron
4G69 intake valve = 34mm (4G63 EVO = 34mm) May fit?
4G69 exhaust valve = 30.55mm (4G63 EVO = 30.5mm) May fit?
4G69 uses 4G64, 4G94 valve spring retainers
4G69 uses 4G63, 4G64 head bolts (can use 4G63 ARP head studs )
4G69 uses 4G63, 4G64 main bolts (can use 4G63 ARP main studs )
4G69 uses 4G63 EVO balance shafts (can use 4G63 EVO BS eliminator kit )
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Old June 24th, 2008, 09:40 PM   #2 (permalink)
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Great info. thank you


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Old June 24th, 2008, 09:45 PM   #3 (permalink)
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yeah no prob. The intake and exhaust valve springs in the 4G69 are unique to that engine and don't cross reference with any other engines. The internals are very strong and can handle 10-15psi of boost on stock internals, I believe. And I also found out that the 4G69 is that the block height is 6mm shorter than the 4G64. This brings the block height back to the same as the EVO 4G63. The 4G69 uses the same length rods as the EVO with a longer stroke of 100mm. EVO pistons, even forged ones can be used in the 4G69. However, these pistons need to be 87mm. That's the only downside. The solution is to get stroker pistons for the EVO in 87mm. 87mm pistons for an EVO, however, are not easily sourced. They more than likely would have to be made custom by JE, Wiseco, Arias, etc.
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Old June 24th, 2008, 10:16 PM   #4 (permalink)
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yeah, ive heard that about our stock internals. I love mitsu engines. this is all great information, good to know stuff. I noticed the GT guys have similar threads in their respective forums. Thanx for doing this research. e-rep to ya.
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Old June 24th, 2008, 10:24 PM   #5 (permalink)
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yeah no prob
just found this for those who wanted a turbo... Road///Race Big 16G Ralliart Turbo Kit [Road///Race Big 16G Ralliart Tur] - $4,499.00 : Road Race Motorsports, Road Race Motorsports
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Old October 16th, 2008, 06:43 PM   #6 (permalink)
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ahah nice im thinking of getting turbo or anther car still not sure
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Old December 29th, 2008, 04:44 AM   #7 (permalink)
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great info here, has anyone sourced out performance springs?
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Old June 21st, 2009, 08:29 PM   #8 (permalink)
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do you think these would fit seeing how the 4g69 retainer is the same as the 4g63
Mitsubishi 4G63 Dual Spring Kit Mitsubishi 4G63 Dual Spring Kit [SPR-M1007D] - $349.00 : Roccos Performance, Online Auto Spares
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Old June 21st, 2009, 10:42 PM   #9 (permalink)
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NO, 4g63 valvetrain parts wont switch over to the 4g69

i have researched this a lot and have come to the conclusion that custom made valve springs is the way to go
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Old June 21st, 2009, 10:44 PM   #10 (permalink)
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very nice
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Old August 23rd, 2009, 06:01 PM   #11 (permalink)
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Hey so everyone has been saying that the 4g69 can only do 8 psi max. maybe 9 with a good tune. If this thread is saying that the motor can hold up to 15 psi? How come everyone is stopping at 8? And if I can do up to 15 psi, what needs to be done to achieve that?
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Old August 23rd, 2009, 08:20 PM   #12 (permalink)
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It depends on the turbo and tune... but we have seen 8 be a consistently safe number. In terms of eclipses max we have seen is 10.. but the ralliart lancer guys have gone higher.

So I still say stay at 8 if you want to be safe.. and with a good tune you can consider risking 9..
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Old August 23rd, 2009, 10:04 PM   #13 (permalink)
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ahhh 10 psi killed a eclipse already.... 8psi is safe on a car with a stock engine, bullet proof the engine and you can go higher boost.
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Old August 24th, 2009, 11:38 AM   #14 (permalink)
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I've been told by rre with pistons we can do 10-12.
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Old August 24th, 2009, 01:11 PM   #15 (permalink)
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^and with the cast iron block the engine is pretty sturdy
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Old August 24th, 2009, 03:07 PM   #16 (permalink)
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Ok so Mecks is running 10 psi and has not killed his car. It has nothing to do with the AMOUNT of BOOST you are pushing it has everything to do with the CFM"S. It depends on the Turbo you go with. Our springs are fine with piston's and rods upgraded you will be good for about 500hp if you ever make it there. Other than pistons and or rods the only other that has given up under duress was the crank at about 675 hp. There are plenty of threads with this information on here SEARCH!!!!!
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Old August 24th, 2009, 08:01 PM   #17 (permalink)
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Quote:
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I've been told by rre with pistons we can do 10-12.
Based on the results of Whynott's turbo I would say be sure to upgrade rods aswell before upping boost beyond 8-10
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Old February 24th, 2010, 07:04 PM   #18 (permalink)
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Does anybody know where i can buy a turbo kit made for the 4g eclipse?
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Old February 24th, 2010, 07:07 PM   #19 (permalink)
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Pm ronron, he has a georgous out for sale, besides that you're talking custom or supercharger.
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Old February 25th, 2010, 01:33 AM   #20 (permalink)
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is this for the 4cyl 4g cuz on the site it is listen for the lancer only???
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Old February 25th, 2010, 02:03 AM   #21 (permalink)
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Yea it's made for the ralliart 04-06
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Old February 25th, 2010, 02:04 AM   #22 (permalink)
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Old February 25th, 2010, 02:06 AM   #23 (permalink)
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is this for the 4cyl 4g cuz on the site it is listen for the lancer only???
When it was made there was non 4g eclipse, with a 4g69
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Old February 25th, 2010, 03:34 AM   #24 (permalink)
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Huh??
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Old February 25th, 2010, 09:07 AM   #25 (permalink)
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Huh??
At the time the RRM Kit came out the 4g wasn't around, The RA was the only 69 car around
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Old February 25th, 2010, 09:19 AM   #26 (permalink)
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Old September 27th, 2011, 04:44 PM   #27 (permalink)
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Ok guys just ordered head studs for my car and received them and they are too big..... Is there a difference in the 4g63 dsms and evo?
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Old September 27th, 2011, 04:55 PM   #28 (permalink)
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Quote:
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Hey so everyone has been saying that the 4g69 can only do 8 psi max. maybe 9 with a good tune. If this thread is saying that the motor can hold up to 15 psi? How come everyone is stopping at 8? And if I can do up to 15 psi, what needs to be done to achieve that?
you would need an internal build (forged pistons, rods, head bolts, etc.) to go above 8 - 9 psi. You'd also need complete headwork upgraded - like the springs, valves, retainers, lifters, etc. otherwise you'll have crippling valve-float. Nothing Delta Cams can't fix - for a price, of course.

Also guys remember - b/c we have such a high compression ration in our engine, having a high boost # doesn't necessarily mean more power. DejectedAngle has 8:1 compression and 10 lbs or so. If I get mine built w/ my 10.5:1 pistons (keeping stock compression) and push in 10 lbs, I will get more whp. that is why I kept the stock compression ratio when I had my pistons built. b/c I didn't want to lose the power from lowering compression. So 10.5:1 compression with 10 - 13 lbs would be SICK AS A Ma'f*ck. for sure, no doubt, at least 400 whp. (that is w/ the 6G75) but I know you can make at least 300 whp w/ the GS and a good Turbo kit + tune. Bmshue has done it.
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Old January 16th, 2012, 11:33 PM   #29 (permalink)
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okay so two questions... 1. with the turbo whats the true hp est for a gs with 8 lbs of boost and a good tune? and 2. would running 8lbs of boost on a daily driver on the 4g69 be reliable? bc my eclpise is my only form of transportation at the moment...(working on getting a 99 2g
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Old January 17th, 2012, 05:19 AM   #30 (permalink)
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Around 250whp and yes 8 pounds is relatively safe given a good tune.
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Old January 17th, 2012, 05:32 PM   #31 (permalink)
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Around 250whp and yes 8 pounds is relatively safe given a good tune.
now is that with stock internals?
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Old January 18th, 2012, 02:37 AM   #32 (permalink)
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leet or elemenophee are the best resources for 4g turbo's that I know of. You can ask Bshue, but I haven't seen him log on here for a LONG time now.

As far as I know the only problem leet is having is oil seal issues with the high oil pressure that the MIVEC engines tend to run. He's working with MikeW at RRE right now to try and resolve the issue.
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Old January 18th, 2012, 03:23 AM   #33 (permalink)
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Yes B-bo4 ......the key is the tune. The stock 4g69 motor has pumped out over 300whp while that is on the edge it is pretty impressive to more than double oem whp on a stock motor.
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Old January 18th, 2012, 10:50 AM   #34 (permalink)
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stronger internals and bearings will handle more power, it's not the boost pressure that kills your motor, boost pressure just increases output, you can take two identical engines, and depending on what you do to them, and how they flow, you can make more power with less boost, so again it's not the boost you need to worry about, it's the power coming out the other end that will break stuff if the tune is solid...
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Old January 21st, 2012, 12:58 AM   #35 (permalink)
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^ thanks for the info now the only problem is finding someone i trust with doing the mod to my baby! and the tune... i live in a small town in mississippi and needless to say mitsu eclipses are the last thing people around here know about espicially when it comes to a 4cyl...and even when it comes to more popular mitsu cars ive only seen one truly well done evo so maybe i should talk to the guy who has the evo and see what he knows
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Old January 21st, 2012, 01:18 AM   #36 (permalink)
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tuning will be your biggest hurdle...everything else is pretty straight forward...
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Old January 24th, 2012, 06:16 PM   #37 (permalink)
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okay so i have a question it may be stupid but why are the ebay turbo kits so terrible? is it the turbine its self?
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Old February 13th, 2012, 01:00 AM   #38 (permalink)
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With all this talk about compression, has anybody done a 10.5:1 compression for the 4G69? If yes, what are the results?
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Old February 13th, 2012, 02:38 PM   #39 (permalink)
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okay so i have a question it may be stupid but why are the ebay turbo kits so terrible? is it the turbine its self?
They have a reputation for poor build quality...the turbos themselves have a bad rep, people say fall apart, blow up etc, as well as ebay manifolds have a bed rep, and are supposedly prone to cracking...but other claim their ebay shit works without issues for years...but i wouldn't trust a knock-off turbo on my car...

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With all this talk about compression, has anybody done a 10.5:1 compression for the 4G69? If yes, what are the results?
I had my head shaved a bit, dunno how much difference it made...i would like to see 13:1, lol

increase compression ratio, increase power...as long as you use proper fuel.
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