RX-7 trans for better cruising?
01-11-2013, 09:53 PM
#1
Newb
Thread Starter
Join Date: Sep 2012
Posts: 19
Total Cats: -1
RX-7 trans for better cruising?
Found this on another site, and it got me thinking about an RX tranny swap. Seems that 1-3 are nearly the same but 4 and 5 are much taller. Have a peek.
Is this really possible? If so I'm going to find an RX as soon as Pick-and-Pull opens.
I wish I knew- the parts interchangeability page went away a few years ago.
According to the spread sheet I made for this work- my '99 has a 4.30 rear, 3.136 1st, 1.888 second, 1.33 third, 1 4th, and 0.814 5th.
and I chose gears that are supposed to go into that box and FD that went into the rear- but I'm not sure.
But in choosing a 86-91 RX-7 5 speed (3.415, 2.002, 1.366, 1 and 0.691) and a 3.91 rear end (can't recall where that came out of) I got a comparison, gear, Stock, modified- in rear wheel ratio:
1st- 13.48, 13.59
2nd- 8.12, 7.83
3rd- 5.72, 5.34
4th- 4.3, 3.91
5th- 3.5, 2.7
So 1-3 are pretty close, and 5th would lower a 4000rpm cruise to 3087 rpm. Gotta think that would do wonders for fuel economy.
I had been thinking of a turbo 1.6l. But could not figure on how to make the calibration production quality and reliability vs. my '99. so...
Eric
According to the spread sheet I made for this work- my '99 has a 4.30 rear, 3.136 1st, 1.888 second, 1.33 third, 1 4th, and 0.814 5th.
and I chose gears that are supposed to go into that box and FD that went into the rear- but I'm not sure.
But in choosing a 86-91 RX-7 5 speed (3.415, 2.002, 1.366, 1 and 0.691) and a 3.91 rear end (can't recall where that came out of) I got a comparison, gear, Stock, modified- in rear wheel ratio:
1st- 13.48, 13.59
2nd- 8.12, 7.83
3rd- 5.72, 5.34
4th- 4.3, 3.91
5th- 3.5, 2.7
So 1-3 are pretty close, and 5th would lower a 4000rpm cruise to 3087 rpm. Gotta think that would do wonders for fuel economy.
I had been thinking of a turbo 1.6l. But could not figure on how to make the calibration production quality and reliability vs. my '99. so...
Eric
Reply
0
0
01-15-2013, 03:19 PM
#4
After reading all the crap about tII trans and the adapter plates etc... I've realized the same thing i'm sure sav and others have realized... We may all want a better trans option but when it comes down to it the 6 speed is where it's at. Not worth going through all the trouble to be different. Not enough pros and too many cons.
Just like reading the f20c thread makes me want an f20c swap... if you think about it you should just buy an s2k and not swap cause the cars are pretty similar and it already comes with the motor (they are to be had for around 10k now days for an older one)... ***** and giggles are fun but when it comes down to it. we being practical or we playing for ***** and giggles?
Just like reading the f20c thread makes me want an f20c swap... if you think about it you should just buy an s2k and not swap cause the cars are pretty similar and it already comes with the motor (they are to be had for around 10k now days for an older one)... ***** and giggles are fun but when it comes down to it. we being practical or we playing for ***** and giggles?
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
russian
Miata parts for sale/trade
6
10-08-2015 03:01 PM
Greasyman
General Miata Chat
2
09-28-2015 10:44 AM
