Back in the olden day's we used to get a lumpy cam, larger pistons, shaved head, exhaust system.
What can I do to a 6g74 Magna?

Back in the olden day's we used to get a lumpy cam, larger pistons, shaved head, exhaust system.
What can I do to a 6g74 Magna?

Exactly what you just said.

The good old days . . . When a quad venturi carburettor on a shiny manifold and an idle that sounded like a sick dog's fart (just to prove you had a lumpy cam) made you a local hero! lol

You may find prices of the bits have gone up since then.:eek2:

a Cam swap from a Ralliart or 380 is common.
HR headers and a good free flowing rear muffler (eg: Lukey LR2779?) and optionally the cat & rest of piping, although it's already nearly 2.5" and OK.
SKR (Steve Knight Racing) in SA can retune ECU's

That's the simple performance mod trail.
If you want to go more extreme, you've got the old-school rebuild path or there are some bolt-on super charger kits.
Working from memory of what I've read around here, the Raptor appears to be the best solution, however they may have just gone out of production. Also price is in the $6k-10k range for any new SC setup. You may be able to find one second hand - they have been a couple sold on. remember, that's all from my potentially dodgy memory, but you get the idea.

Another option is a 6G75 engine swap from a 380 - or as someone here is finishing off, a MIVEC 3.8 engine build.

If you have resources, there was also a ?4L? V8 engine available in Japan and possibly Hyundai's that has a slight chance of sharing 6G7 series engine mounting points.

modern motors will never match the sound of a tq30 in a 350 chev

If you have resources, there was also a ?4L? V8 engine available in Japan and possibly Hyundai's that has a slight chance of sharing 6G7 series engine mounting points.

I believe it was a 4.5L in Japan found in their limosine type cars, not many were made from what i saw

Back in the olden day's we used to get a lumpy cam, larger pistons, shaved head, exhaust system.
What can I do to a 6g74 Magna?

All of the above is still common on today's car, differences being you're not tuning it with a screwdriver, you're tuning it with a computer and getting reliability and a heap more power as a bonus.

On that note however, engine work in expensive. Cams, headwork, oversize pistons, fuel upgrades, exhaust system, etc... is likely going to set you back near $8,000 which exceeds the cars value.

a Cam swap from a Ralliart or 380 is common.
HR headers and a good free flowing rear muffler (eg: Lukey LR2779?) and optionally the cat & rest of piping, although it's already nearly 2.5" and OK.
SKR (Steve Knight Racing) in SA can retune ECU's

That's the simple performance mod trail.
If you want to go more extreme, you've got the old-school rebuild path or there are some bolt-on super charger kits.
Working from memory of what I've read around here, the Raptor appears to be the best solution, however they may have just gone out of production. Also price is in the $6k-10k range for any new SC setup. You may be able to find one second hand - they have been a couple sold on. remember, that's all from my potentially dodgy memory, but you get the idea.

Another option is a 6G75 engine swap from a 380 - or as someone here is finishing off, a MIVEC 3.8 engine build.

If you have resources, there was also a ?4L? V8 engine available in Japan and possibly Hyundai's that has a slight chance of sharing 6G7 series engine mounting points.

Hyundai's new V8 has no resemblance to Mitsubishi engines. In the grand scheme of things, engine mounts are the least of the problems. Might as well fit a chev motor if going v8.

6g75 is surely best bang for buck with the magna. 190kw straight off the bat - job done.

Back in the olden day's we used to get a lumpy cam, larger pistons, shaved head, exhaust system.
What can I do to a 6g74 Magna?

Come to think of it, by the time you have done all that to an "olden day's" motor (ie carb, low compression, poor ignition timing control, etc), you probably make more killerwasps with a stock 6G74. So why stuff around with a reliable and efficient (comparatively speaking) design?

Unless you have the urge to splash cash and tinker of course. lol

6g75 is surely best bang for buck with the magna. 190kw straight off the bat - job done.

How much will a decent one cost these days. A few grand?

How much will a decent one cost these days. A few grand?


Mal quoted me around $1500+ for the engine i am fairly sure...then everything else on top, equates to over 2k, ultimately not sure if it becomes worth it unless you've blown your original engine...

6g75 pushes more then 190, more like 210 at the flywheel. Great motor.

6g75 pushes more then 190, more like 210 at the flywheel. Great motor.


Having a 6G75 in my TH, I agree the conversion is the best bang for buck you can get.

However a stock one won't make close to 210 Kw @ Flywheel.


With HM Headers and exhaust mine made 159.7Kw @ wheels, so if you assume approx 16-17% drivetrain losses, then around 185-190 is a much more realistic estimate.


Then if you still want more you can look at cams, headwork, intake, tuning etc
With the above it starts to get expensive but getting up to around 220-230 (street-able) Kw @ flywheel is achievable.

Having a 6G75 in my TH, I agree the conversion is the best bang for buck you can get.

However a stock one won't make close to 210 Kw @ Flywheel.


With HM Headers and exhaust mine made 159.7Kw @ wheels, so if you assume approx 16-17% drivetrain losses, then around 185-190 is a much more realistic estimate.


Then if you still want more you can look at cams, headwork, intake, tuning etc
With the above it starts to get expensive but getting up to around 220-230 (street-able) Kw @ flywheel is achievable.

16-17%? Should be 20-25%. My ralliart stock made 137. Give or take a few for dyno error its still over 20%

16-17%? Should be 20-25%. My ralliart stock made 137. Give or take a few for dyno error its still over 20%

No. Always between 15 and 18% for FWD.

No. Always between 15 and 18% for FWD.

Then how does every stock ralliart manual get 135-140fwkw? my mates ve sv6 had 145atw and its a 200kw flywheel one. the fact it has a longer drivetrain doesn't account for an Extra 15kw loss, it should only be a few % different.

Then how does every stock ralliart manual get 135-140fwkw? my mates ve sv6 had 145atw and its a 200kw flywheel one. the fact it has a longer drivetrain doesn't account for an Extra 15kw loss, it should only be a few % different.

What? Are you actually implying that FWD drivetrain loss is more than 17-18%? What makes a magna different to every other transaxle FWD in the world?

RWD losses are around 20-25% because of the higher strain of rotating a 6 foot long metal driveshaft and spinning an axle right at the back of the car.

Dont take what you see at a dyno is gospel, there are far too many variables. My clio made 120fwkw which is bang on 16-17% given flywheel power is 148kw.

Plus on top of that auto's generally lose a little bit more power. Was this full hecktic sv6 an auto? :}

Plus on top of that auto's generally lose a little bit more power. Was this full hecktic sv6 an auto? :}

Smartarse its a nice car and was manual.
Dave your girls car has girly components and will certainly have a more efficient drivetrain.
Magnas are made of metal and from all the calculations I've done on different dynos 20% wad about the minimum loss.

Smartarse its a nice car and was manual.
Dave your girls car has girly components and will certainly have a more efficient drivetrain.
Magnas are made of metal and from all the calculations I've done on different dynos 20% wad about the minimum loss.

Girly components? Brembos, dual-knuckle hubs and a 6 speed manual? Yeah alright. When my Clio has finished destroying your old magna, it will still be as tight as a ducks arse and ready to go again.

FWD drivetrain losses are very similar for every car. The general transaxle configuration is almost the same for every single FWD car. Has it not occurred to you that the fabled ralliart motor doesnt come close to producing 180kw on an engine dyno? Its a well known fact that many of the ralliart cams were a crap casting and didnt offer anywhere near the timing advance they were supposed to.

Girly components? Brembos, dual-knuckle hubs and a 6 speed manual? Yeah alright. When my Clio has finished destroying your old magna, it will still be as tight as a ducks arse and ready to go again.

FWD drivetrain losses are very similar for every car. The general transaxle configuration is almost the same for every single FWD car. Has it not occurred to you that the fabled ralliart motor doesnt come close to producing 180kw on an engine dyno? Its a well known fact that many of the ralliart cams were a crap casting and didnt offer anywhere near the timing advance they were supposed to.

Well known by who? you? How were some crap? They would all be the same and are a common upgrade for any magna.
"doesn't come close" to the power hey? Well there's alot of creditable sources claiming 180kw including mitsubishi themselves, think i'll believe them before a person on a car forum.

"No Spam" in this thread.
Just a friendly reminder before this turns into another war zone of "I know better than you".

Back in the olden day's we used to get a lumpy cam, larger pistons, shaved head, exhaust system.
What can I do to a 6g74 Magna?

i just glazed over for a moment :) all of the above posts + a dam good tune & kiss runing 91 goodbye at the pump pull trigger and close your eyes, having said all that as long as im under 3k rpm i do get good kms on the highway

Well known by who? you? How were some crap? They would all be the same and are a common upgrade for any magna.
"doesn't come close" to the power hey? Well there's alot of creditable sources claiming 180kw including mitsubishi themselves, think i'll believe them before a person on a car forum.

Sure. I am looking for some old threads on here where someone found out that the cams were identical front and back in a STOCK car when in actual fact the duration should differ between the two. I believe the extra 10 degrees of lift over ordinary TJ 6G74 cams was actually only 6! Believe what you like, but it is worth doing some research on here.

Well known by who? you? How were some crap? They would all be the same and are a common upgrade for any magna.
"doesn't come close" to the power hey? Well there's alot of creditable sources claiming 180kw including mitsubishi themselves, think i'll believe them before a person on a car forum.


It's actually well known by a great number of people. There's been quite a few threads here where it's been discussed before, with plenty of info coming from people who actually worked at the plant.

Just ask Madmagna about the batch of ralliart cams (number 7's), that he purchased direct from Mitsubishi. The entire batch consisted of the rear cams being number 6's not 7's at all. Can't remember if they were stamped 7 or not, but they acknowledged the cams weren't correct & explained that they'd run out at some stage. Simply purchasing a set of number 7 cams is by no means a guarantee that they are what they say they are.

There was also an inconsistency in the 7's, like Dave says. Issues with the cam maker, I believe. Although, I'm
sure Dave will find the threads where this is discussed more. lol

Also, it wouldn't be the first time a car manufacturer or any manufacturer for that matter has inflated their product, now would it? Common belief is that the flywheel figures for the ralliart engine was over-rated, whilst the 380 engine figures were actually under-rated, which would explain why people are getting far better results out of the 3.8l engine compared to the ralliart; considering on paper there's not much difference in the flywheel figures.

This was part of them not all for ****s sake

Also, it wouldn't be the first time a car manufacturer or any manufacturer for that matter has inflated their product, now would it? Common belief is that the flywheel figures for the ralliart engine was over-rated, whilst the 380 engine figures were actually under-rated, which would explain why people are getting far better results out of the 3.8l engine compared to the ralliart; considering on paper there's not much difference in the flywheel figures.[/QUOTE]

No, that is because a 380 has very restrictive cat converters and when u take it away the good heads can be utelised.

As i saw on dyno day i must admit 380 and ralliart power was very close. its possible they could be the same but i wouldn't think any more then that.

Let's not get carried away here with slandering the Ralliart, that wasn't my intention. it is a great engine in it's own right and even engines with a few years and a fair few KM's under them are still pulling good numbers and performing well. It is important to recognise that what the manufacturer states is not always gospel, as was mentioned by al above.

Back to my original point, FWD setups have drivetrain losses of between 15-18%. Anything more than that is generally not right and I would consider there to be a problem somewhere in the set up for the loss to be so high.

As for now ruining the OP's thread, I apologise. These engines can open up really quite nicely once you start in the right direction. I am still VERY keen to see what a 6G74 or 75 can do with a decent high-revving ITB setup. I imagine it would haul ass.