Hi all....

Just wondering. In theory would the 6g75 mivec slide right into the 380 and replace the 6g75SOC?

Just a question.

Cheers everyone!



P.S. Mods if this is in the wrong place, please put it the right sub-forum.

i guess it would, in fact it might be possible to keep the bottom end and swap the heads.

From reading on here about the tuning potential of the 6G75, it would be a waste of money when it is cheaper to explore other potential options

Find the heads, wiring loom, and ECU, and you should be set. Heads will bolt on.

;1134805']Find the heads, wiring loom, and ECU, and you should be set. Heads will bolt on.

Tuffer, as the Pajero uses the 3.8 Mivec engine (which is used in the Ralliart Galant), would it be possible to use the heads, wiring loomm, ECU etc from the to do a swap?

I am guessing MIVEC wont give you much more power these days. Supercharge it

Mivec isnt that good. Im protty sure the heads are not 100% bolt up, as MIVEC requires extra oil galleries/lines.

You would need all the looms etc + ECU. Not worth the money.. Just supercharge it.

Someone has swap the Mivec heads on a 6G74, while another one swap the longblock and use a RPM switch to activate the Mivec feature.

Mivec isnt that good. Im protty sure the heads are not 100% bolt up, as MIVEC requires extra oil galleries/lines.

You would need all the looms etc + ECU. Not worth the money.. Just supercharge it.

Well, in the USA, apparently, it is! Among one of the many threads I read contained some flow numbers on the heads, the guy who flowed them couldnt believe it, saying these heads were among some of the best factory heads he's ever tested in 20 years. I'll find the data...

Pajero, in THEORY, would work, as we still on the 72' and 74's take the heads off and use them on the magnas. But yeah, alot involved.

;1135928']Well, in the USA, apparently, it is! Among one of the many threads I read contained some flow numbers on the heads, the guy who flowed them couldnt believe it, saying these heads were among some of the best factory heads he's ever tested in 20 years. I'll find the data...

Pajero, in THEORY, would work, as we still on the 72' and 74's take the heads off and use them on the magnas. But yeah, alot involved.

tuffy, the 6G75 SOHC heads are excellent too after reading alan J's threads about flow numbers. Better off looking for other ways of gaining power for better $$$

tuffy, the 6G75 SOHC heads are excellent too after reading alan J's threads about flow numbers. Better off looking for other ways of gaining power for better $$$

The MIVEC heads moreso flow even more then standard 75 heads

does the mivec system on the 6G75 DOHC control both intake and exhaust? i read in wiki that the 6G72 dohc mivec from 96 diamante 30M was the last one too control both intake and exhaust lift, many only affect intake. ACCORDING TO WIKIPEDIA!! so yeah i have no first hand experience of this. one interesting fact is while the 3l dohc mivec is 199kw, the torque was 313nm, only slightly up on the 6G74 sohc, so maybe the mivec wont provide much gain . i was keen to get one then read this and talked to a guy who said he had driven both and preferred the 3.5l. shit hold on im comparing the 3l to 3.5. anyone know what the torque figures are for the 6G75 sohc and 6G75 dohc mivec? would the conversion net much bang for buck

Thanks guys...I have been doing more research on the matter. I was looking at replacing the whole 6g75 SOHC with the 6g75 Mivec from the 09 Galant Ralliart.

Thanks guys...I have been doing more research on the matter. I was looking at replacing the whole 6g75 SOHC with the 6g75 Mivec from the 09 Galant Ralliart.

Hey MCHenry,

Seems like a lot of money to buy a whole new engine, drop it in, wire it up, tune it up etc. You wouldn't see much change from $10k if any. Wouldn't a supercharger be a better route to take?

Hey MCHenry,

Seems like a lot of money to buy a whole new engine, drop it in, wire it up, tune it up etc. You wouldn't see much change from $10k if any. Wouldn't a supercharger be a better route to take?

I have the opportunity to buy one quite cheap. Im looking at all options really, but thought it could be idea. If I can get the heads etc for a little cheaper I may look more into that too.

I have the opportunity to buy one quite cheap. Im looking at all options really, but thought it could be idea. If I can get the heads etc for a little cheaper I may look more into that too.

I see. Care to share what sort of price you're talking about? Can come down to if you want atmo or forced induction too.

Im looking at forced...either TT or SC. Friend of the family has written off his 09 Galant and brought it back, trying HARD to take it off his hands!

oooooh nice!!

Im looking at forced...either TT or SC. Friend of the family has written off his 09 Galant and brought it back, trying HARD to take it off his hands!

Well if that's cheap, I know what I'd be doing. Taking the engine out, up on a hoist, buy supercharger kit and related paraphenalia, install, drop engine into 380, enjoy.

From what I have seen on the US galant forums there are enough slight differences to make it non straightforward.

But the Mivec feature can be easy controlled manually as a "hoon" switch...LOL

Just a relay and a couple of oil lines is the theory.


Have a look at this thread for inspiration.

The guy has even fitted a distributor from a 6g72 to the 6g75 to avoid using the ECU.

And...converted the throttle body to be cable instead of stupid drive by wire...

http://www.club3g.com/forum/members-rides/126575-silversides-02-gt-6g75.html

Already read this thread through and through.

man a twin turbo DOHC MIVEC 6G75 would be SWEET.

for coolness and uniqueness factor it's a win... if you're after bang for $$, not so much.

I'm sure you'll run into the problem of finding someone willing to work on a one-off car for a reasonable price.

cheers,
.wook

man a twin turbo DOHC MIVEC 6G75 would be SWEET.

Its being done in the US to a 3000GT. The motor sits 3" above the bonnet lol

The ability to cruise around town with a cam duration of, say, 252*; then pass 4300rpm the cam profile on the intake switch to a race spec...as of yet, their are no aftermarket billet cams available.

You do realise MIVEC is not VTEC... It doesnt have two different lobes? (well maybe the diamante 30M did, I dont know), but I know in the evos, all it does is change the cam positions (ie retard or advance) to create better timing at any RPM...

I can confirm that the 30M did have two different cam profiles, on both intake and exhaust. it was quite a bit more lift too. there was one at the pic a part, i did post pics. there was some sort of system where another roller rocker floated on the higher lift and locked into place when engaged, taking over from other cam lobe and lifter. ill try find the pic.

http://www.aussiemagna.com/forums/showthread.php?t=69921 here you go

Older Mivecs operated exactly like the V-tec system....the newer ones are a simpler form without duel profile switch over...but some of them still vary lift as far as I'm aware.

You do realise MIVEC is not VTEC... It doesnt have two different lobes? (well maybe the diamante 30M did, I dont know), but I know in the evos, all it does is change the cam positions (ie retard or advance) to create better timing at any RPM...

:stoopid:

http://autospeed.com/cms/title_Mountain-of-MIVECs/A_2651/article.html

variable valve timing:
4g63(evo 9), 4B1x

variable cam profile:
4g92(dohc), 6a12(dohc), 6g72(dohc), 4g69, 6g74(dohc, pajero evo), 6g75

The 6G75 MIVEC switches between different lobe profiles but only on the inlet lobes.

The 3.8 Pajero thats been on sale here for a few years has a MIVEC engine with slightly lower comp ratio 9.8:1 than the Eclipse 10.5:1 and probably milder cams.

The MIVEC feature helps get past emissions regulations but doesn't do much for power. You could get a lot more with a lightly modified 380 engine.

Cheers,
Alan

Cheers Alan....So pretty much dont worry about it then hey? Just wait till there are a decent set of cams etc on the market and go from there hey!

Cheers Alan....So pretty much dont worry about it then hey? Just wait till there are a decent set of cams etc on the market and go from there hey!

A decent set that won't cause the ECM to go crazy.

Just got to wait for some to become available.

So what are availabe now?

So what are availabe now?

Nothing overly exciting internaly.

Ok...quick question to all you engine nuts out there. Iv given up on the Mivec conversion, but im now looking at trying to source some Mivec forged pistons and rods for when its eventually SC. Now the question is with the Mivec 3.8 from the 4G Eclipse the compression ratio is 10.5:1 and the 380 3.8 SOHC compression ratio is 10.0:1, how much of a headache would it be to get the Mivec forged rods and pistons to work?

are you sure they are forged? i didnt think it was a turbo car

They are for the super charger bolt on that is made for the 4G Eclipse, but thinking they may work on my 380.

Ok...quick question to all you engine nuts out there. Iv given up on the Mivec conversion, but im now looking at trying to source some Mivec forged pistons and rods for when its eventually SC. Now the question is with the Mivec 3.8 from the 4G Eclipse the compression ratio is 10.5:1 and the 380 3.8 SOHC compression ratio is 10.0:1, how much of a headache would it be to get the Mivec forged rods and pistons to work?

Since when have the mivec rods & pistons been forged??

They are after market....sorry Fooz

3.8 MIVEC from the Eclipse has ordinary thin '74' rods and the piston has an intruder with flycuts for valve clearance. I don't know what the Oz Pajero is like. Both Graham and I would like too see inside one.

I'd post up some pictures of the Eclipse 3.8 MIVEC internals but now that there is no "Additional Options" to add attachments to posts I don't know how.

Cheers,
Alan

3.8 MIVEC from the Eclipse has ordinary thin '74' rods and the piston has an intruder with flycuts for valve clearance. I don't know what the Oz Pajero is like. Both Graham and I would like too see inside one.

I'd post up some pictures of the Eclipse 3.8 MIVEC internals but now that there is no "Additional Options" to add attachments to posts I don't know how.

Cheers,
Alan

Create a new reply in this thread and the additional options will be present again... They won't be visible if you just quick edit a post.

http://i837.photobucket.com/albums/zz294/AlanJoy/pistontop.jpg

http://i837.photobucket.com/albums/zz294/AlanJoy/pistonsrods.jpg

OK these are the pictures of the top of MIVEC 3.8 Eclipse 10.5:1 piston and the skinny '74' rods

Cheers,
Alan

hey, I have a set of those rods... spent hours cleaning them up, just to have the guy building my engine say they're too skinny!

how many people have actually bent these skinny rods in a 6G74?? or is it more of a better safe than sorry thing?