Magna Throttle Body

spetz · Post by **spetz** » Sat Mar 19, 2005 11:35 pm

I am thinking about having a custom plenum made for my 6A12 MIVEC.

Basically use the original runners with the dual length system but of course ported, polished, honed etc and then a custom plenum with a Magna V6 throttle body. They are 65mm (5mm more than standard MIVEC TB)
My question is will the TPS and idle stuff work on the FTO ECU? Is the voltage the same etc?

Jono · Post by **Jono** » Mon Mar 21, 2005 3:45 pm

i thought smaller plenums give you more response rather than bigger plenums?

or am i wrong?

G_A_V · Post by **G_A_V** » Mon Mar 21, 2005 9:23 pm

bigger plennum gives better throttle responce, however with hthe magna tb, it wouldnt have maf sensor, cause the magnas have the mas

spetz · Post by **spetz** » Thu Mar 24, 2005 8:37 pm

True GAV I didn't think about that...

But would it really make a difference? I mean the TB just has some basic functions which I do I assume is interchangable between mitsubishi?

NERVIS · Post by **NERVIS** » Thu Jun 23, 2005 3:14 pm

Im Pretty sure the Magna TB will bolt strait onto the FTO, you might need to swap over the TPS though. roat least reset the magna one, other than that the bolt spacing is the same.

Post by **Bennoz** » Thu Jun 23, 2005 6:50 pm

I've just been down this road... and it was a long waste of time.
Yes, the Magna TBs fit on, but there's f_ck all difference in size. The whole 65mm business is a myth. I went from wrecker to wrecker looking at Magna TB's & I saw every type, off every model in existance. The inlet side of the TB is 65mm - but so is the FTO one! Its the rear side (butterfly width) that is 60mm on them all - and that is across the board - all Magna & all FTO (6 cyl.) Thats where the myth originated - people measuring the wrong end of the TB. Your best bet (especially if the manifold is being done) just give them your existing TB to bore out. You can get a bigger butterfly valve put in, then get them to machine out the inlet side in an increasing size to the end. With very little fuss, they can be tunnel bored through the entire length of the TB to 63mm, with more fiddling you can get them larger - the size here is goverened by the availability of brass butterflys' (63, 65, 67mm are all off the shelf sizes.) Then have the inlet side machined out further from the butterfly to the opening. You can get it out to 68mm at the end. It is wise to have the size reducing from the opening to the butterfly because the air gets compressed, more dense & speeds up - hence the term 'throttling'. Cost of machining to get this done is about $100 - max. Than all your FTO bits bolt straight back onto the unit.

Now as soon as my misses gets home with the Digi camera, I will post comparison pics of both Magna TBs & a modified FTO one. Seeing as I've got Magna one's being used as paper weights around here after that exercise!