Evo IX Turbo pics
Originally Posted by scott88vr6
Wonder how long it will take Vendors to pick these up?
Originally Posted by joeycoates
Gee, doesn't that kind of remind you of all of the "20G" turbo's that different companies are trying to perfect? Same back half with a little bit larger compressor side? Maybe the Mitsu engineers have gotten it right......
the difference with this comp side is that the diffuser diamter is larger. this is very important because this is the actual EFFECTIVE part of the turbo that does most of the work. aside from the comp wheel spinning the diffuser is what makes boost.
the way it does this is it is shaped like a french horn, cept gradually leading to a larger diameter, and it don't flare out so violently at the end. but bascially you start with a small tube and it grows in diameter as it goes around. this causes the air to slow down, slow air in front with fast air behind it makes pressure! bam... that's how you build boost. making a bigger diffuser makes the air slow more, MORE BOOST RESPONSE! VERY VERY AWESOME that they decided to make such a BIG change to the turbo... we should all be very happy about this!
Last edited by trinydex; Jun 12, 2005 at 05:09 AM.
Originally Posted by scott88vr6
Found this in a magazine I just picked up. The compressor housing is a bit bigger. I wonder how big of a difference this will make. Sorry for the crappy pic, I don't have a scanner. This article was in Road and Track's SPEED magazine
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Those are the specs for the regular turbo, whereas the spec for the magnesium turbo is different. Torque for the magnesium/aluminum beast is 400 Nm @ 3000 rpm which is slightly over 300 ft lb. Also both regular and Mg version of the new turbo apparently let the engine rev much more freely at the top end.
Originally Posted by trinydex
yes... we need all turbo vendors to look into picking these up!
unless the compressor wheel is a larger diameter... then no it is not the same. in fact the 20g can be run on the stock compressor cover, it's just a bigger comp wheel.
the difference with this comp side is that the diffuser diamter is larger. this is very important because this is the actual EFFECTIVE part of the turbo that does most of the work. aside from the comp wheel spinning the diffuser is what makes boost.
the way it does this is it is shaped like a french horn, cept gradually leading to a larger diameter, and it don't flare out so violently at the end. but bascially you start with a small tube and it grows in diameter as it goes around. this causes the air to slow down, slow air in front with fast air behind it makes pressure! bam... that's how you build boost. making a bigger diffuser makes the air slow more, MORE BOOST RESPONSE! VERY VERY AWESOME that they decided to make such a BIG change to the turbo... we should all be very happy about this!
unless the compressor wheel is a larger diameter... then no it is not the same. in fact the 20g can be run on the stock compressor cover, it's just a bigger comp wheel.
the difference with this comp side is that the diffuser diamter is larger. this is very important because this is the actual EFFECTIVE part of the turbo that does most of the work. aside from the comp wheel spinning the diffuser is what makes boost.
the way it does this is it is shaped like a french horn, cept gradually leading to a larger diameter, and it don't flare out so violently at the end. but bascially you start with a small tube and it grows in diameter as it goes around. this causes the air to slow down, slow air in front with fast air behind it makes pressure! bam... that's how you build boost. making a bigger diffuser makes the air slow more, MORE BOOST RESPONSE! VERY VERY AWESOME that they decided to make such a BIG change to the turbo... we should all be very happy about this!
I tested turbo outlet tems on a pair 57 trim at 22psi. One turbo was built with a B housing the other the larger E housing. The B had turbo outlet temps (TOT) at 350. The E dropped the temp to 325. The B housing made 25 ft lbs more torque. The E housing picked up 1 MPH at the track (124/125). I like the B housing better. The extra torque was quite significant. 400/375.
Mitsu likely went to this housing because the evo9 has mivec and likely gained some torque that they could sacrifice in the turbo. Better all around performance with the two changes together.
If you dont have a mivec engine I wouldn't be so quick to want to jump on this new housing.
damn that looks pretty good. I bet it has a tad more lag than the old style but I would sacrifice a few hundred RPMs for more top end. Cant wait for someone to bolt this up on a 8. I would like to see the WR and the 9 dynoed on the same car!!
