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Old 08-12-2013, 06:35 PM   #1
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Default Lengthening Gears on a Turbo 1.8

Hey guys,
So during my daily driving I find that 1st gear is completely useless, and when I'm doing some freeway runs I have to shift 2 or 3 times more than you should. Also I was with a friend (on the track... in mexico....) in his 370z and I stay neck and neck with him but I have to shift twice while he only does once, thus I start falling behind slightly. Also I run out of gears around 130ish with plenty of power and grip to go. I have a 5 speed torsen btw.

I assume the gearing is short because NA the miata's needed shorter gears to get the power down but now with about 240whp I just go through the gears too quickly.

Is there any way to lengthen the gears properly?!?


Thank you





The information i've found, but doesn't really help because I have no idea what I'm looking at...... Flyin' Miata : Technical info : Gearing calculator
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Old 08-12-2013, 06:45 PM   #2
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Get a lower ratio differential, quaife gears or turbo II transmission.
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Old 08-12-2013, 07:04 PM   #3
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Just a lower ratio rear gear will lengthen all the gears. 3.63 is available straight from mazda for $450 and its the lowest you can buy off the self for the stock diff.
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Old 08-12-2013, 07:32 PM   #4
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Run some big rear tires!!!
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Old 08-12-2013, 07:53 PM   #5
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+1 on 3.6 gears. Should give you much more topend and longer gears all around.
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Old 08-12-2013, 08:06 PM   #6
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and pop that 5 speed with the quickness. and actually make his car slower unless he makes quite a bit more than 240 later
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Old 08-12-2013, 08:22 PM   #7
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With the 5-speed? Bolt in a 3.9 with pumpkin and the associated speed sensor. Call it a day.
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Old 08-12-2013, 09:02 PM   #8
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I have a 3.9 Torsen that I will trade for a 4.1 or 4.3 since I'm going to get 3.636 gears before I put it in anyway.
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Old 08-13-2013, 06:59 PM   #9
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What did the 1.8 M's come with from the factory? 3.9 Torsens or 4.10 Torsens? And WTF is a pumpkin (other than a gourd-like squash from the genus Cucurbita)?
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Old 08-13-2013, 07:00 PM   #10
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Quote:
Originally Posted by mx5autoxer View Post
What did the 1.8 M's come with from the factory? 3.9 Torsens or 4.10 Torsens? And WTF is a pumpkin (other than a gourd-like squash from the genus Cucurbita)?
All NA8s are 4.10.
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Old 08-13-2013, 07:07 PM   #11
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Quote:
Originally Posted by das stig View Post
Hey guys,
So during my daily driving I find that 1st gear is completely useless, and when I'm doing some freeway runs I have to shift 2 or 3 times more than you should. Also I was with a friend (on the track... in mexico....) in his 370z and I stay neck and neck with him but I have to shift twice while he only does once, thus I start falling behind slightly. Also I run out of gears around 130ish with plenty of power and grip to go. I have a 5 speed torsen btw.

I assume the gearing is short because NA the miata's needed shorter gears to get the power down but now with about 240whp I just go through the gears too quickly.

Is there any way to lengthen the gears properly?!?


Thank you




The information i've found, but doesn't really help because I have no idea what I'm looking at...... Flyin' Miata : Technical info : Gearing calculator
I'd suggest dissecting that calculator until you DO have an idea what you're looking at.

Then you'll be able to answer your own question better than anyone else will.
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Old 08-14-2013, 12:44 AM   #12
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TII Transmission
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