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4G Eclipse GT/SE Specific 3.8L V6 (6G75) Specific Forum


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Old February 24th, 2009, 08:54 AM   #161 (permalink)
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thanks again slipper, im seeing that you and a couple of others are going to be my mentors here.
as far as using the MIVEC heads and having them effective or functional, what all will i have to do to get them to work. they are oil pressure actuated correct? kind of like vtec? (hate to make the association)
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Old February 24th, 2009, 09:11 AM   #162 (permalink)
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I think 74s aren't forged like the 75s. In the description of the pic it says: "Don't get scared they don't break that easy."
the 74's internals except for the pistons are forged. they are much bigger just like everything else on the 74 compared to the 72. its like Mitsu was practicing building a monster motor. 4 bolt main, larger stroke crank, thicker rods, damn. but then its like they got smarter and built the 75. its got lighter rods, better CR, and all the good things from the 74 and better.

slipper if im reading that guide right, its saying that the valves are a little bigger than the VQ35's! if thats right im getting those heads as my next NA mod. that is what is holding this builds power back i know it, its my damned heads. my valves now are only 33mm intake and 29mm exhaust! ugh and yet i know someone that is making 530whp with a 35R and ported 72 heads. stock valves, stock cams, virtually stock bore all on 20psi. ill introduce him later but i imagine some of you already may know of him.
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Old February 24th, 2009, 11:36 AM   #163 (permalink)
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the 74's internals except for the pistons are forged. they are much bigger just like everything else on the 74 compared to the 72. its like Mitsu was practicing building a monster motor. 4 bolt main, larger stroke crank, thicker rods, damn. but then its like they got smarter and built the 75. its got lighter rods, better CR, and all the good things from the 74 and better.

slipper if im reading that guide right, its saying that the valves are a little bigger than the VQ35's! if thats right im getting those heads as my next NA mod. that is what is holding this builds power back i know it, its my damned heads. my valves now are only 33mm intake and 29mm exhaust! ugh and yet i know someone that is making 530whp with a 35R and ported 72 heads. stock valves, stock cams, virtually stock bore all on 20psi. ill introduce him later but i imagine some of you already may know of him.


Ondontii????
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Old February 24th, 2009, 11:38 PM   #164 (permalink)
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naw, i know him too. he lives here in Utah with me and warmandscsi. i know a lot of people have had grief with Tj but he has seriously out done himself with the 6g72 and truth be told he's a great guy.
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Old February 25th, 2009, 06:33 PM   #165 (permalink)
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thanks again slipper, im seeing that you and a couple of others are going to be my mentors here.
as far as using the MIVEC heads and having them effective or functional, what all will i have to do to get them to work. they are oil pressure actuated correct? kind of like vtec? (hate to make the association)
They are hydraulically actuated, yes. I'm thinking you can use your stock ECU and pair with something like an EMS or similar, which can control the MIVEC signal piece of it. You shouldn't have to do an ECU swap for that.

As for the "mentor", really, I don't think I'm not as knowledgeable as some people might think. I'm pretty sure there are other folks in here that know far more than I do.

Just that they're quite few. Or perhaps some are just not speaking up
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Old February 25th, 2009, 06:37 PM   #166 (permalink)
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Oh... and 90, huh? That's along the lines of what I had in mind a while back. Actually, LS6 or Cobra 90mm DBW was what I was thinking. I think people thought that was a stupid idea back then.

Kudos to you for being that idea personified
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Old February 26th, 2009, 12:43 AM   #167 (permalink)
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They are hydraulically actuated, yes. I'm thinking you can use your stock ECU and pair with something like an EMS or similar, which can control the MIVEC signal piece of it. You shouldn't have to do an ECU swap for that.

As for the "mentor", really, I don't think I'm not as knowledgeable as some people might think. I'm pretty sure there are other folks in here that know far more than I do.

Just that they're quite few. Or perhaps some are just not speaking up
i havent quite searched to my fullest to find out just exactly how the MIVEC works. i need to find out just how it works to see if my current setup would work. i have a 00 ecu being tuned with evoscan and a greddy emanage blue. they work in conjuction pretty well but naturally the 00 ecu not being able to be flashed does hold me back quite a bit. i dont think i will really make much more power with the stock 72/74 heads even though im getting a set ported. i might as well just try and find a set of mivec heads to do the swap with and then start making serious numbers. with the way it sounds that the heads are designed that alone will grant me the power ive been looking for in other (possibly the wrong) areas.

if there are more knowledgable people here it is a shame that they dont chime in to either correct or to add occationally. i myself havent been here long enough to know you all but hope to get to know most of you pretty quickly. thank you again for having me and welcoming me in such a cool fashion. i really plan to learn a lot here.

as far as the 90mm tb, slipper, i think that the Q45 tb is one of the simplest and boost friendly 90mm tb's out there. i know for a fact that the ford tb's tend to leak under heavy boost and i havent quite hear anything bad about the gm ones. i just know that if you were to switch to the Q45 one like i did, you end up loosing your IAC and a few more functions. you could adapt them to work but it would require you to research more than what i have done already. are your tb's electronic or still cable type and what size are they?
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Old February 27th, 2009, 12:32 AM   #168 (permalink)
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Yeah, I've been noticing a lot of talk about these TBs and was curious about em. I hadn't realized until now how much "acclaim" it has - and apparently you can attest to how well it works! We're electronic/drive-by-wire. To that end, I'm not sure if the Q45s come with a solenoid or cable-spring mechanism.

Truth - I'm actually getting tired of talking tech, mostly because, unlike in C3G or, say 3SI, there's not as much gearhead talk in here. Most of the time I feel like I'm a hypocrite for talking as much "tech" than I currently have on the 4G. Part of it's circumstance, and part's adjusting plans. Not that I owe anyone any "proof" of anything, but I sometimes think I ought to just keep my thoughts to myself until I get my own shit in order. Another truth - I'm actually very able at this point in time to have a full engine built, but I've been tempted and lured to go a different route performance-wise.



But back on topic, I had a discussion with several folks... all the way in CA in fact... about sourcing work for the engine build. One shop was going to do all bottom end, emphasis being custom crank work. While that was happening, the easier head work would be sent to an affiliated engine shop. These were guys who knew their stuff... and knew Mitsu engines! Actually, my main guy's closely affiliated with a few reputable shops up in Dallas that are known for building DSMs and some 6G7x's, so I had a bit of confidence in knowing that I was in good hands.

There's a whole lot more that's been done since then, and itman3s is one of those pioneers who's made it happen. I'm glad we're now seeing more pipedreams realized. Ironic that in this case it's by a guy with a 3000GT! (no offense man )

Look at some of the discussions and numbers thrown out earlier in this thread, and in the '65-M engine thread. That should give you some roundabout figures that might help you figure out what realistic goals might be with a swap like this. But until someone's actually provided some before and after flow numbers, they're just going to be calculations based on theoretical max limits. From what I gather you understand the difference between the theoretical and actual, and how frustrating it can be when you're talking about engines
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Old March 2nd, 2009, 03:17 AM   #169 (permalink)
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slipper, if you really want to get into the techtalk with a good group of drama free gearheads check out our site Mitsubishi Powered.com • Portal. im sure you will be a very valued member there.

its good to hear you are in contact with some really knowledgable people. this is good for all of our progression in the community. there are a lot of things we need to discuss about these heads and their variants. what im really trying to find out is whether the regular 75 heads flow better than the 72/74 heads. i know just having bigger valves will increase the potential for flow but the combustion chamber shape and all the associated angles all contribute to better performing heads. Tj and i were also discussing how if i was to do this head swap, i would lose a good amount of compression because of the combustion chamber shape/increase on the 75-M heads and that means in order for me to keep my compression ratio close to what it is i would have to spend the money again on pistons and a rebuild. hmm what i could do is just use a 75-M motor and sell the built 74.
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Old March 2nd, 2009, 09:54 PM   #170 (permalink)
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Well just think about it this way...

The 6G74 has a bore x stroke of 93mm x 85.8mm, whereas the 6G75 is at 95mm x 90mm. Think of how easy it would be to make the 75-M a square 95mm x 95mm engine with some crank regrinding and no overbore. Then you'd be already at 4.2L!

Now be a little daring, and go for a 97 x 97 square, decent overbore with some crazy regrind and ultra-short rods... and you'll be at 4.5L easy!

Thing is, I haven't seen any flow numbers on the heads yet. But you can quite clearly see the potential in the '75M engine as a whole. You don't have to invest awfully much in labor for a stroker crank because of the already tall deck height, plus you've got nothing but good indications of a top-notch set of heads, with variable valve timing!

Yeah. It's your choice. I honestly don't even care for the built engine that's in my 3G anymore either. Not that it can handle all the power potential that the '75M can offer.

But that's why I've thought it best to go a "different" route first before going engine What's the point of having that much power if you can't make it stick, right?
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Old March 3rd, 2009, 01:34 PM   #171 (permalink)
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hmmmm i think i know where this is going for you. lol we'll talk a little later about this because Tj and i have been contemplating it as well.
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Old March 5th, 2009, 08:32 PM   #172 (permalink)
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Bump!

Did Hobbs change their number? I tryed calling and all I get is "this number is not a working number". I would really like to know, because if My supercharger build doesn't work out then my money is going to Hobbs instead.
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Old March 5th, 2009, 09:47 PM   #173 (permalink)
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area code changed to 575
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Old March 5th, 2009, 11:17 PM   #174 (permalink)
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Very good to note! Thank you!!
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Old March 23rd, 2009, 12:28 PM   #175 (permalink)
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Did you send everything out already jeep?
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Old March 23rd, 2009, 12:41 PM   #176 (permalink)
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No... It won't be until late summer.
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Old March 23rd, 2009, 08:29 PM   #177 (permalink)
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Old April 5th, 2009, 11:49 PM   #178 (permalink)
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Old May 15th, 2009, 12:27 PM   #179 (permalink)
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Old May 15th, 2009, 08:08 PM   #180 (permalink)
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I hear ya! I want to see more info on this! This is the final step I'm taking with my car, and I'm almost to the final stage!
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Old May 19th, 2009, 12:57 PM   #181 (permalink)
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what is the number to reach these guys? cause the one on the website doesnt work
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Old May 19th, 2009, 01:25 PM   #182 (permalink)
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E-mail them and they will give you the number. He is a real cool guy!
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Old May 20th, 2009, 07:04 AM   #183 (permalink)
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Old May 20th, 2009, 05:48 PM   #184 (permalink)
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did he dyno the car with the new head? i would love to here how it sounds
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Old May 21st, 2009, 09:22 AM   #185 (permalink)
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I think he was waiting on his turbo build.
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LS2: Longtube headers + cat less x-pipe + Ram air intake + ported intake manifold and Throttle body = 395whp and 380ftlb tq.

Next up: Comp cam, Yella Terra rocker arms... Hello 450whp!!!!
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Old May 21st, 2009, 10:30 AM   #186 (permalink)
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Old May 28th, 2009, 09:39 PM   #187 (permalink)
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Sorry that I don't get on the site much. Just been very busy. The area code is wrong on the web site it has changed from 505 to 575-523-0956. I try to answer my email every night, so if you have any questions just give me a call or email me at hbbsdnns@aol.com.
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Old June 2nd, 2009, 03:01 PM   #188 (permalink)
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i posted some retarded ad up in here. and now im getting a spanking for it.

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Old June 23rd, 2009, 08:13 PM   #189 (permalink)
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so how much more horse power u get after the heads being done
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Old June 23rd, 2009, 10:40 PM   #190 (permalink)
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so its been months since this thread started where are things at Itman3s?
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Old June 23rd, 2009, 10:42 PM   #191 (permalink)
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No idea...
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LS2: Longtube headers + cat less x-pipe + Ram air intake + ported intake manifold and Throttle body = 395whp and 380ftlb tq.

Next up: Comp cam, Yella Terra rocker arms... Hello 450whp!!!!
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Old June 24th, 2009, 12:40 AM   #192 (permalink)
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i talked to him the other day.

he will post up soon he said.
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Old August 6th, 2009, 11:39 PM   #193 (permalink)
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1 month later?
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Old August 7th, 2009, 03:21 AM   #194 (permalink)
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http://club4g.org/board/mitsubishi-n...tml#post260558

There you go man..
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Next up: Comp cam, Yella Terra rocker arms... Hello 450whp!!!!
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Old August 7th, 2009, 11:27 PM   #195 (permalink)
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itmans very first post on this thread says 3.8L whats a 3.7???
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Old August 11th, 2009, 07:57 PM   #196 (permalink)
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K Im definatley doing this however im not familiar with in depth engine work. Whats the best way to go about this. Stage 3 port and polish from hobbs, cams maybe a stroker kit and a tune?
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Old August 11th, 2009, 07:58 PM   #197 (permalink)
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What are your goals for the car?
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LS2: Longtube headers + cat less x-pipe + Ram air intake + ported intake manifold and Throttle body = 395whp and 380ftlb tq.

Next up: Comp cam, Yella Terra rocker arms... Hello 450whp!!!!
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Old August 11th, 2009, 08:03 PM   #198 (permalink)
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Lol lots of horsepower. This is my first build not exactly a mechanic lol prob not much help
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Old August 11th, 2009, 08:21 PM   #199 (permalink)
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Well I mean are you going turbo, All- motor? How do you want your powerband? nice and flat tq curve, or a high revving peak monster?


You must first look at your goals before you can decide on which path you must take.
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Old August 11th, 2009, 08:26 PM   #200 (permalink)
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yeah i've heard that a lot lol. Im not really which road i want to take i just want a fast car lol
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