Hey 380 Folks.

Since you guys seem to miss out on anything more agro than a K&N Panel filter, I was hoping to get some pics of the 380 inlet manifold in some more detail.

Many of you know I am about to release a fully cast aluminium replacement inlet manifold for the 3rd Gen Magnas (assuming it works as the prototype did) and given the large similarity of components between the 6G75 and 6G72/74 motors I was hoping from the onset to adapt the manifold to suit the 380 - esp since I bought number plates banking on an AWD version :cry:

Ok, I know quite alot about the technical but need pics and bolt patterns etc since it's been such a long time since I (we) took the launch night car apart at Newcastle :shifty:

Therefore I need:

Pics or knowledge of whether the 3.8 has the same lower inlet manifold as the 3rd gens (yes I know the 3 & 3.5 have a slightly different lower inlet manifold).

Pics of the plenum with the plastic off

Pics of the electronic throttle body - top view, side views. Easy to make an adapter and to mount the ETB rather than cast an entirely new manifold

Pic of between the plenum and rear tappet cover

Pic of strutbrace top view and clearance over stock plenum.


I eagerly look forward to everyone's assistance. Thanks :thumbsup:

http://www.fotothing.com/photos/4e9/4e9401027cba3dbd87fb433b3cbb9494.jpgIts not much, but a start

I did try to get a bigger picturelol

You bugger, martY lol

That's my engine bay! I recognise the oil smear on the front cam cover!


Hhaha! I thought you'd got the 90mm intake by stealth :)

I'll get some measurements for the strut brace clearance soon.

they're funky looking spark plug leads on the 380

they're expensive looking spark plug leads on the 380

FYP :P

wow. i want the 380 spark plug leads in my engine.

but for how much mitsu will ask for them, and if they would even fit the 6g74. not gonna bother.

they're funky looking spark plug leads on the 380

The 380 has the now common coil on plug ignition setup, so there is no actual "spark plug lead" and distributer for the leads to run from.

What ya can see in the picture is the individual "coil pack" for each spark plug. This setup is no good for the magna people as the magna has a distributer with leads to each plug

mine doesnt :D hehe




ez boy,
just a q on yur manifolds, how hard would it be to get one with a throttle body on the other side ??

mine doesnt :D hehe




ez boy,
just a q on yur manifolds, how hard would it be to get one with a throttle body on the other side ??

word. Id love some dual throttle bodies ian...

back on topic...

http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct010.jpg

http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct011.jpg


http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct004.jpg

http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct005.jpg

http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct007.jpg

http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct006.jpg

http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct002.jpg


http://i189.photobucket.com/albums/z179/Krossbolt/Car%20Pics/My%20Car/Manifold/30Oct003.jpg

Tell me what else you need and grab one of the photos and show where u want the measurements.

A big thanks to Knotched for the pics. They're very helpful atm. I will try to hook up with a 380 owner when the manifolds are rollin' or maybe grab a hire car and play with it.

Re: Op-sided TB, they can be cut and welded, should be enuf play to run a saw thru each end and swap them over - just wondering what you're going to do about the throttle cable and the brake resouvoir?

They dont have a throttle cable. They are fly by wire.

They dont have a throttle cable. They are fly by wire.

I know, but I don't think Meh's 3L is ;)

I know, but I don't think Meh's 3L is ;)
mine is a 3.5ltr now :-)

do u remember bens set up, booya's ? he has some pics here http://****as69.gallery.netspace.net.au/BOoya
so something similar to that with the t/b cable

I hope this clears everything:

A big thank for the information supplied so far.

I do need some other data:

A: Distance between the rear of the plenum and the firewall
B: Distance between the rear of the plenum and the front edge of the manifold flange (in a level line)
C: Height from bottom of flange to top level of runners.


OF INTEREST:

'D' highlights a hot water passage for pollution control crap. Might be worth running a bypass hose and keeping the hot water away from the inlet manifold ;)

XTRA PICS NEEDED:

I would be grateful for some pics of the TB side of the plenum and TB rear side of plenum, along with some notes on locations of fittings attached to the plenum such as brake booster lines etc.

Thanks :thumbsup:

OK, give me a day or two. Just got a new battery for the camera and it needs 24hrs to charge.

Foozrcool and I would be very interested in any development of the plenum. RPW have told us they won't do any 380s anymore :disgusted:

Foozrcool and I would be very interested in any development of the plenum.
Here here!

Oops! Forgot the pictorial reference :redface: Fixed.

380s are in the too hard basket for everyone - which is sad given they're a good effort for a mitsubishi outfit stripped of cash, engineers and courage.

Guess we'd better do the gentlemanly thing and pickup the tab :cool:

The 380 plenum is an interesting evolution over the 3rd gen setup. The lower have of the intake manifold seams to be identical, but the top half has some very interesting changes. Most notably is the angle of the TB and the tapered plenum shape.

I'd say they tried to even out cylinder fill with these changes, and buy the looks of things the runner lengths seam a little longer and possibly a little larger in internal diameter.

Aside form the fly-by wire issue, it'd be interesting to see what a 380 top half would do bolted to a 3rd gen 3.5.:cool:

The 380 plenum is an interesting evolution over the 3rd gen setup. The lower have of the intake manifold seams to be identical, but the top half has some very interesting changes. Most notably is the angle of the TB and the tapered plenum shape.
I'd say they tried to even out cylinder fill with these changes, and buy the looks of things the runner lengths seam a little longer and possibly a little larger in internal diameter.

The 45 angled plenum neck to to help even cylinder fill for sure. 380 owners report the motor to be largely useless over 4500rpm. The runners can no doubt support the higher rpm - it's the plenum that is too small. The small plenum helps down low but the runner diameters don't let the airspeed get high enought at low and mid. The motor is relying on it's capacity, cams and compression for its low and mid range. The ECU uses the electronic TB to try and gain air speed by holding opening angles until the airspeed peaks, then it opens it a little more until it peaks and so on. A replacement manifold will give it a big help :D


Aside form the fly-by wire issue, it'd be interesting to see what a 380 top half would do bolted to a 3rd gen 3.5.:cool: It IS a 3.5 just been bored a touch and stroked. Might make it a touch more useful down low but the reduced stroke of the 3.5 will still leave the deadspot.

It IS a 3.5 just been bored a touch and stroked. Might make it a touch more useful down low but the reduced stroke of the 3.5 will still leave the deadspot.
Yes a 3.5L with 300cc higher capacity, one compression point higher combustion pressures and better atomisation capable injectors. lol

But I know what you are saying, I just thought it'll be interesting to see how the plenum/intake setup works on an otherwise stock 3.5.

380 owners report the motor to be largely useless over 4500rpm.

Trust me, it's entirely the restricted exhaust. Get rid of the stock muffler and it revs very nicely to over six. Most of the power is developed from 4000 up, check the stickied dyno graphs.

It's a different engine after a few mild mods.

Trust me, it's entirely the restricted exhaust. Get rid of the stock muffler and it revs very nicely to over six. Most of the power is developed from 4000 up, check the stickied dyno graphs.

It's a different engine after a few mild mods.

And so it should open up with two cats removed, high flow muff and extractors. The runners favour high rpm activity and so does the cam profile.

I'd like to get these things over the magical 200kw barrier and getting the volumetric efficiency up with a better inlet manifold is critical. As mentioned there are lots of useful points to the motor: light reciprocating mass of the rods and pistons, low friction pistons (has it's downsides too), higher compression than 3.5, improved camshaft profile, nitrided valve springs, deshrouded valves, increased displacement.

The gains shown on the 3L auto down low were spectacular imo given the massive drivetrain loss and engine capacity. A larger motor utilising the same port sizes and runner diameters will produce better VE figures and more torque.

Can anyone verify that the bolt pattern of the 3.8 is the same as the 3.5??

Can anyone verify that the bolt pattern of the 3.8 is the same as the 3.5??
Wouldn't have a clue, but I can send you my old metal shim top manifold gasket as I now am running a RPW insulator type gasket.

I'd like to get these things over the magical 200kw barrier


Mate, we're already there if you are talking KW at the flywheel. And it wasn't hard to do or expensive at all.
With extractors Foozrcool is getting some really big HP (relatively speaking for a NA V6).

However, the fanfare has been less than stellar from everyone else so the two of us who've got there haven't made it a big deal. I put this down to the lack of enthusiasm for the model generally because of its looks, certainly not the way it drives. And it seems current Magna owners won't be tempted.

Maybe when some 1/4 times are posted...

The fanfare has been less than stellar due mostly to people not knowing what the engine is capable of, unlike the older magnas, the modifications for the 380 are not as accessable nor as well documnented.
I really do think the poor opinion of the 380 is due to the lack of press about it, it's a brilliant car and i feel more than a match for the common*****s and ford's out there in terms of both raw off the line speed and handling (in the handling even more so).
I can't extol the virtues of the 380 enough to people, yet i find allot of folks don't know what the 380 is lol.
I know i plan to put extractors and chip my car...as soon as i get more than a week back at home damn work's keepin me far to busy for my liking :D might look into this inlet manifold business as well.

I know i plan to put extractors and chip my car...as soon as i get more than a week back at home damn work's keepin me far to busy for my liking :D might look into this inlet manifold business as well.

That's great.

You'll find it's really worth it from all points of view. For instance my fuel economy is around 8.6/100km, and in the low 9s when I fang it. If I tow it goes up to 10.5 :)

From a power point of view I am really satisfied and usually don't even run the higher power setting (map). PM me if you want more details.

With extractors you're going to be in different territory (foozrcools lol) and you have to wonder if contemplating forced induction is even worth it.

THE GASKET FITS! It's identical to the 6G72 & 74 gaskets on the 24v motors. So it's simply a matter of getting a loan car to inspect the fitment and modifications necessary to marry it up. :cool:

THE GASKET FITS! It's identical to the 6G72 & 74 gaskets on the 24v motors. So it's simply a matter of getting a loan car to inspect the fitment and modifications necessary to marry it up. :cool:
Cool, I just read your post in the other thread re the manifold, looking good! :D

The only thing I'd be worried about is the strut brace after seeing the size (height) of your prototype.

Can someone take some cubic measurements of their plenum (not including the TB bend)?