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Old 12-10-2019, 06:23 PM   #1
3eyesraver
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Default WRX linkage shifter vs STI direct shifter

Does anyone know the differences between a linkage shifter (WRX) and a direct shifter (STI) in details?

Words said it all: linkage - direct. But I just want to know a bit more on the technical side of it. Google doesn't seem to have much info besides a bunch of STI Short Throw results.

I have Perrin bushing and the SS for a few months. I drove my friend's STI yesterday again and it feel soo sooo ... "right". Has anyone swapped from linkage to direct before? I assume it's a "no" then what is reason? Will a STI's trans swap carry STI shifter over as well?

My apologize for a bunch of questions, I'm no mechanic just an IT who likes cars.
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Old 12-10-2019, 07:27 PM   #2
Sillo
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You can't swap from one to the other. You'd have to replace the transmission with one from an STI trans to have a direct linkage.

Cable snifters aren't inherently bad, but the one in this car is.
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Old 12-11-2019, 11:26 AM   #3
Schoat333
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I believe the old 5spd wrx transmission had the linkage, but whatever changes they made to make it a 6spd for 2015+ forced them to go with a cable. I'd have to see them side by side to understand why.
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Old 12-11-2019, 12:14 PM   #4
simpleJ
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Quote:
Originally Posted by Schoat333 View Post
I believe the old 5spd wrx transmission had the linkage, but whatever changes they made to make it a 6spd for 2015+ forced them to go with a cable. I'd have to see them side by side to understand why.
They crammed an extra gear into the same case and had to go t9o cable from a rod linkage to make room.
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Old 12-11-2019, 12:52 PM   #5
3eyesraver
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Quote:
Originally Posted by simpleJ View Post
They crammed an extra gear into the same case and had to go t9o cable from a rod linkage to make room.
I don't know how to feel about this... 6th is nice but the trade-off was so great...
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Old 12-11-2019, 01:16 PM   #6
Norskie
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Originally Posted by 3eyesraver View Post
I don't know how to feel about this... 6th is nice but the trade-off was so great...
I haven't looked at the ratios, but sometimes when a manufacturer adds a gear the top gear remains about the same, but they change the ratios of all the ones in between ... i.e. the MPG at cruising speed remains the same, but the engine can be kept in it's power band better.
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Old 12-11-2019, 01:54 PM   #7
3eyesraver
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Quote:
Originally Posted by Norskie View Post
I haven't looked at the ratios, but sometimes when a manufacturer adds a gear the top gear remains about the same, but they change the ratios of all the ones in between ... i.e. the MPG at cruising speed remains the same, but the engine can be kept in it's power band better.
This reminds me of a drag I did with a 5.0 GT fellow. I shifted to 4th and almost 5th while he kept pulling on his 3rd. His 3rd was long enough for me to get home, have dinner, watch some movies, pass out, and he still haven't shift 4th.
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Old 12-12-2019, 02:24 PM   #8
Schoat333
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Quote:
Originally Posted by simpleJ View Post
They crammed an extra gear into the same case and had to go t9o cable from a rod linkage to make room.
Looking at pictures of the 5spd and 6spd side by side. The front part with the bell housing looks almost exactly the same on both. The center section, which I assume has the center diff and reverse gear, is very different between the two. Maybe that center section also has 6th gear?
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Old 12-14-2019, 06:48 PM   #9
simpleJ
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Yes, the differntiatjon is for 6 and the cable. Still a split case unit.

I think even the ratios are the same as the 5 speed but with tall over drive on 6th.

The final drive is much bigger than on the 5 speed cars though
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