INSTALLING A M90 on a 6G72

[Tlmitf]

I take that to mean that the factory innards cannot take much more pressure, and therefore you run into the cost of rods and pistons very early in the quest for power? Or is there something else?

I know I'm asking some basic questions here, I seem to have made some assumptions along the way that are incorrect.

[Oldf4g]

Something i've been wondering about when it comes to forced induction.... is WHY do you need an aftermarket ECU? It doesn't make any sense to me..... the MAF is after all a Mass 'Air' Flow sensor. It records how much air is coming in to the engine. Hence if you put a MAF before the supercharger it's going to register more air coming in. Wouldn't it therefore cause the stock ECU to inject more fuel and bobs your uncle?

Yes, the MAF will measure air, but it usually runs out of range with all the extra boosted air going through it.
As a real rough numbers out my a$$ example, say it runs at 80% capacity when the engine is at full rpm and full load (maximum amount of air the engine will require)
Now, lets say a turbo or supercharger at that same maximum rpm and load adds 60% more airflow through the engine.
Your MAF will only add in the extra 20% then flatline for the rest.

Cost and reliability mainly.

Cost is a big one. There are 2 kinds of car people, those who can build it themselves and those who pay someone else.
(im not saying there is anything wrong with being either, so dont flame)
For the ones that can build it themselves, they come up with the crazy projects, but often also spend the time, effort and money on a 'better' car, Supra, Skyline, rotor, classic muscle car, old school jap ect ect.
The magnas are a very good car, but lets face it, they are a mass produced family sedan aimed at an older market, they arent really seen as sporty or desirable once they got a few years on them.

[MadMax]

The magnas are a very good car, but lets face it, they are a mass produced family sedan aimed at an older market, they arent really seen as sporty or desirable once they got a few years on them.

Yes, indeed.
Why spoil a reliable and powerful car by parking a blower on it? (unless racecar!)

I'm regularly driving between Adelaide and Nairne through the back roads, done it several times in a manual CJ Lancer, and yesterday in my TJ auto sedan. With the Lancer, I need to judge run-ups and gear changes precisely, to maintain speed in some hilly parts. The TJ just powers up the hills. In the Lancer, the lack of power is obvious, in the TJ I did the drive in less time and a much more relaxed manner and never felt "Shoot, this thing needs a supercharger/turbo!" So why spoil a good thing?

(9.6 L/100Km for the Magna, 7.6L/100 km for the Lancer, hardly worth worrying about really.)

[Tlmitf]

Call me a junkie, but there isnt enough life in the 74/auto trans combo in my 'rada. I need more roll on torque for some solid pulling power in 3rd. I may be able to get the desired result with some cams and converter work, but boost is more fun

[ih8hsv]

Put in a 3.8 should keep you happy for awhile

[WytWun]

Something i've been wondering about when it comes to forced induction.... is WHY do you need an aftermarket ECU? It doesn't make any sense to me..... the MAF is after all a Mass 'Air' Flow sensor. It records how much air is coming in to the engine. Hence if you put a MAF before the supercharger it's going to register more air coming in. Wouldn't it therefore cause the stock ECU to inject more fuel and bobs your uncle?

Regarding the aftermarket ECU, it is an assumption by many that it is the only way. In part this derives from:
- reasonably comprehensive ROM definitions for stock ECUs not being widely available until relatively recently (2011 or thereabouts, compared to 2006-07 for Evo 7/8)
- lack of awareness of that availability
- in many cases tuners only want to work with what they know (which is usually the commercial standalone and piggyback ECUs)

As a practical matter the Karman Vortex MAF on 3.5l Magnas can support effective displacement approaching 7l. It does need to be operated upstream of the compressor though with sufficient piping length between the two to avoid pressure wave back propagation interfering with the flow measurement.

The stock Magna ECU code doesn't include some niceties which are included in the Evo ECU code which limits its effectiveness with more extreme setups, however keeping the boost to limits the stock 6G74 bottom end can cope with (around 6-7psi seems to be the consensus from my reading) should be well within what the stock code can manage without major operational issues (though some tables/maps need to be rescaled to optimise fuel flow and ignition timing once boost kicks in).

[Tlmitf]

So in having a KH auto Varada, everything is against me. Oh well, guess ill leave it stock and wait for this mill to expire and then evaluate options from there.