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Evo 9 mr 6 speed

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Old Jul 7, 2018, 11:50 PM
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Evo 9 mr 6 speed

Can you make big power on a evo 9 6speed. If you get the transmission redone???
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Old Jul 9, 2018, 07:11 AM
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define big power.

launches are really what kill it, and slamming 3/4th since those are the smallest gears (physically) and are usually the first to let go
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Old Jul 9, 2018, 08:36 AM
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From what I've read, the problems with the 6 speed become apparent during track days where the trans temperatures get a lot hotter than they would on the five speed and fourth gear is usually the first to fail. I've had a 6 speed for 4 years from from 400whp and now to 600whp and I've had to replace the main shaft bearing but never had an issue with the gear assemblies.
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Old Jul 9, 2018, 01:41 PM
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Hmmm.... well ok this makes a lot of sense. I was curious cause I was just looking around and seeing why everyone changes the 6 speed to a 5 speed. I was curious thou is there no modification or something you can do to make the 6vspeed as strong at the 5 speed?
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Old Jul 10, 2018, 07:17 AM
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I have a 6-speed right now on loan from a friend. After driving this car, I would have purchased an MR if I could do it all over again years ago. The 6-speed drives SO much nicer than the 5-speed, and I never tracked my car or launched it or anything so the strength wasn't a concern.
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Old Jul 10, 2018, 08:00 AM
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i've had both. depends on what you mean by big power, but you can get stronger gears that will help anyway
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Old Jul 10, 2018, 05:15 PM
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4th gear is physically smaller and there is about half a quart less fluid. Fourth tends to get hot and fail with torque numbers above 350.
I've used both and prefer the 6 because:
1. It shifts better
2. I prefer the gear ratios
3. I prefer the shifter location
The downsides are:
1. expensive as crap to rebuild (due to freight shipping cost)
2. Very little support.
3. Upgraded gear sets are big $$$
I have a broken 6 in my car now. I can't decide between tossing in the 5 I have or selling it and dealing with the 6 until I can afford to get it fixed.

6 > 5 x 1,000,000
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Old Jul 10, 2018, 05:28 PM
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Thanks every one I really appreciate it. I love all the feedback. Right now I'm looking at a evo 9 mr and was just curious on the 6 speed. If I should get it or not. Also to see if there is any support for it.
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Old Jul 10, 2018, 05:30 PM
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They make upgraded gears and synchros for the 6 speed but its not cheap. That being said I'm still rocking my 6 speed but don't plan on making big power. Keep the tq down and be religious with fluid changes and it should last a long time if you drive sensibly.
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Old Jul 10, 2018, 05:31 PM
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gear ratios are kind of lame on the 6 speed i thought. i want a taller 3rd and 4th.. and 5th and 6th lol
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Old Jul 12, 2018, 05:30 AM
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Originally Posted by kyoo View Post
gear ratios are kind of lame on the 6 speed i thought. i want a taller 3rd and 4th.. and 5th and 6th lol
its a road race transmission so the ratios are really close. I completely agree though, i would love a longer 5th and 6th. my zx10 was the same way.
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Old Jul 12, 2018, 10:35 AM
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I'd actually like a shorter 5th.
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