jimk

MM 245

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If you have a Metric Mechanic 245 transmission, is it all you expected?

 

Do you have the Ultimate or Sport Ultimate?

 

If the Sport Ultimate, do the revised gear ratios feel right?  What diff ratio do you have with it?

 

If you needed another transmission would you buy another MM unit?

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Jim, where do they talk about changing the ratios on the 245?  I could only find the page about the 265/280...

 

You have a 245 behind the s14?

Edited by irdave

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There is another topic on here where the pages are posted showing the gear ratios for both 245 styles MM sells.

Courtesy that post, I attached those sheets.  Maybe MM doesn't do the ratio change anymore, I haven't talked to them.  I don't have their catalog.

MM 245OD01.jpg

MM 245OD02.jpg

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1 hour ago, irdave said:

You have a 245 behind the s14?

Yes, it's getting old and noisy.

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1 minute ago, jimk said:

Yes, it's getting old and noisy.

Add some Slick50.

 

:D

  • Haha 1

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That stuff only works on US, Ray, not transmissions or anything like that.

 

t

 

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Interesting things to think about.  Thanks.  (Side note Jim; I'm picking up a 2002 with the s14, 265 and 4.10 rear end this weekend.  If you want to drive it to see how those ratios feel, you're welcome to.)  Personally, I like shifting more- those tall, wide ratios get me in trouble- usually with the law.

 

Gear ratios for the 265/6 are: 3.82:1, 2.2:1, 1.4:1, 1:1, 0.81:1, with a 4.10 rear end- from the interwebs for the e30m3...

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1 hour ago, TobyB said:

That stuff only works on US, Ray,

Ray admitted he was a hack in another post.

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1 hour ago, irdave said:

Gear ratios for the 265/6 are: 3.82:1, 2.2:1, 1.4:1, 1:1, 0.81:1, with a 4.10 rear end- from the interwebs for the e30m3...

1st gear must be a crawller.   The 3.68:1 in the 245 bugs the hell out of me for slow.

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56 minutes ago, jimk said:

1st gear must be a crawller.   The 3.68:1 in the 245 bugs the hell out of me for slow.

 

 

One could start out in 2nd 😉

 

I'm running the 265 with the 2.5.

 

Cheers,

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main issue with 245 ( and the mm "sport" version) is the huge gap between second and third.  the 265 has a similar issue.  most won't notice this in street driving, but it becomes a glaring problem in sporty or track driving.  a bandaid is to put a 4.10+ diff in the back, but then that just moves the problem...now there is no good top gear.

 

 

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If I recall, that was the reason for the MM sport OD.  I think it has the first 4 gears spaced like a close-ratio transmission, with an OD 5th gear tacked on for freeway cruising.

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It appears that MM changed the gearset from the main shaft that drives the layshaft only because all the gears 1,2,3,& 5 are approx 4.5% higher.  The gearing from the layshaft to the output was not changed, so the split % remains the same.  Direct (4th) is unaffected.

Edited by jimk

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2 hours ago, Ian said:

If I recall, that was the reason for the MM sport OD.  I think it has the first 4 gears spaced like a close-ratio transmission, with an OD 5th gear tacked on for freeway cruising.

Not according to those specs jim posted.

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3 hours ago, mlytle said:

 a bandaid is to put a 4.10+ diff in the back, but then that just moves the problem...now there is no good top gear.

 

 

Is that issue obviated with another 0.2 liters and a 7800 redline?

 

:)

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