Mythbusters: Miata Style - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 02-11-2008, 11:09 AM   #1
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default Mythbusters: Miata Style

Curious to hear from anyone here who has converted a 90-99 to a 6 speed manual from a 5 speed manual. Specifically, I'd like to know if you used the plate that goes between the motor and trans from the 6 speed car, or did you re-use the 5 speed plate?

I know what the conventional wisdom is. I don't think it's true. Looking for knowledge from those who have actually done the conversion, not anticdotes from what you heard some guy did once.
Ben is offline   Reply With Quote
Old 02-11-2008, 11:18 AM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,326
Total Cats: 1,926
Default

Boy, what a letdown. I saw that title and thought "Wow, Adam & Jaime are going to shoot Miatas out of a cannon, or strap rockets on them, or try to jump them over things. Or at minimum cruise around San Jose and see how many guys vs. girls talk to them... "
Joe Perez is offline   Reply With Quote
Old 02-11-2008, 11:41 AM   #3
Junior Member
iTrader: (7)
 
Join Date: Jun 2005
Location: Texas
Posts: 376
Total Cats: 16
Default

Quote:
Originally Posted by Ben View Post
Curious to hear from anyone here who has converted a 90-99 to a 6 speed manual from a 5 speed manual. Specifically, I'd like to know if you used the plate that goes between the motor and trans from the 6 speed car, or did you re-use the 5 speed plate?

I know what the conventional wisdom is. I don't think it's true. Looking for knowledge from those who have actually done the conversion, not anticdotes from what you heard some guy did once.
I will have first hand information in the next few weeks!
dvcn is offline   Reply With Quote
Old 02-11-2008, 11:49 AM   #4
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Quote:
Originally Posted by dvcn View Post
I will have first hand information in the next few weeks!
I know, and I'm sending you the plate anyway. But to me it looks like any 1.8 plate would work with a 5 or 6 speed.
Ben is offline   Reply With Quote
Old 02-11-2008, 11:53 AM   #5
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

I thought the plate was needed because the starter location was different between the 5 and 6 speed.

+1 for a disappointing thread, the title was misleading.
jayc72 is offline   Reply With Quote
Old 02-11-2008, 12:52 PM   #6
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

I think all the NB plates are the same, 5 spd and 6 spd
Ben is offline   Reply With Quote
Old 02-11-2008, 12:55 PM   #7
Elite Member
iTrader: (10)
 
IcantDo55's Avatar
 
Join Date: Apr 2007
Location: VA Beach
Posts: 1,768
Total Cats: 18
Default

Subscription...
IcantDo55 is offline   Reply With Quote
Old 02-11-2008, 02:29 PM   #8
Junior Member
 
Join Date: Oct 2005
Location: king george, va
Posts: 85
Total Cats: 0
Default

I know what you mean, ive gotten mixed info on this topic a million times and would love to know the real anwser.
viciousclipse is offline   Reply With Quote
Old 02-11-2008, 03:18 PM   #9
Elite Member
iTrader: (3)
 
Join Date: May 2006
Location: Houston, TX
Posts: 2,900
Total Cats: 0
Default

Quote:
Originally Posted by jayc72 View Post
I thought the plate was needed because the starter location was different between the 5 and 6 speed.

+1 for a disappointing thread, the title was misleading.
If the starter is in a different location then the mounting holes for the starter would have to be in a different location on the block... making to swap considerably more difficult.
Arkmage is offline   Reply With Quote
Old 02-11-2008, 03:20 PM   #10
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

we held up a 99 6-spd plate to a 03 5-spd plate and they looked identical
Ben is offline   Reply With Quote
Old 02-11-2008, 03:23 PM   #11
Senior Member
iTrader: (1)
 
Join Date: Sep 2007
Location: Trenton, NJ
Posts: 1,125
Total Cats: 0
Default

maybe look up part numbers and see if they match?
ArtieParty is offline   Reply With Quote
Old 02-11-2008, 03:30 PM   #12
Ben
Supporting Vendor
Thread Starter
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

I have. They do.
Ben is offline   Reply With Quote
Old 02-11-2008, 03:54 PM   #13
Junior Member
 
Join Date: Jan 2007
Location: Campbell, California
Posts: 106
Total Cats: 0
Default

i have first hand info on this... i just used the 5speed plate. as stated above the only difference is the one starter bolt hole. otherwise, its the same. also the sensors are in opposite locations and the connectors need to be swapped with one another. otherwise every time you go in neutral your reverse lights go on. otherwise, its a plug and play deal. even with all 1.6 stuff. i still run a 1.6 clutch on mine.
juhanis is offline   Reply With Quote
Old 02-11-2008, 04:30 PM   #14
Senior Member
iTrader: (8)
 
Join Date: Mar 2006
Location: Floriduh
Posts: 882
Total Cats: 0
Default

I did the swap 2 weeks ago. I reused the 5-speed plate from my 96, as well as the starter. There was one bolt that did not line up, it was one of the small diameter bolts that went to the starter. This bolt has been stated before by Markp. I didn't reinstall one of the wire harness brackets, I think it was the bracket that the left off bolt connected to. I ran a couple zip ties through the semi-open hole to secure the harness in the area. Otherwise that's about it. The turret doesn't require oiling like the NA 5-speed. A cleaner way of filling the 6-speed is to pour the fluid into the turret while the fill plug on the tranny is open, with a pan beneath it. I had a hand pump and did the fill from underneath, and as usual, I made a mess, even with the pump. The fill plug is in a more difficult to reach area than the 5-speed plug was located.

Shifting is smooth. The additional gear may be better for track use as it will probably maintain the rpms better than the 5-speed, heel and toe seems a little easier since I don't have to blip the throttle as much, less rpm change between gears with the 6-speed. I have to get used to shifting into the additional gear, and also that 4th gear is like 3rd with the 5-speed, etc. I notice I drive with the rpms a little higher than I used to. I think the 3.63 gears would be pretty darn sweet with this transmission. I am still running the 3.90s.
soflarick is offline   Reply With Quote
Old 02-11-2008, 04:33 PM   #15
Elite Member
iTrader: (2)
 
Join Date: Jan 2007
Location: Lexington, SC
Posts: 2,084
Total Cats: 0
Default

Quote:
Originally Posted by soflarick View Post
The fill plug is in a more difficult to reach area than the 5-speed plug was located.
i didn't think that was possible!
mazda/nissan is offline   Reply With Quote
Old 02-11-2008, 05:10 PM   #16
Senior Member
iTrader: (2)
 
Join Date: Nov 2007
Location: orlando, FL
Posts: 558
Total Cats: 0
Default

does this apply for 1.6s?
XxGoKoUxX is offline   Reply With Quote
Old 02-11-2008, 05:37 PM   #17
Elite Member
iTrader: (11)
 
Join Date: Jun 2007
Location: Overland Park, Kansas
Posts: 5,382
Total Cats: 43
Default

Quote:
Originally Posted by xXxGoKoUxXx View Post
does this apply for 1.6s?
My guess would be this:

Quote:
Originally Posted by juhanis View Post
i have first hand info on this... i just used the 5speed plate. as stated above the only difference is the one starter bolt hole. otherwise, its the same. also the sensors are in opposite locations and the connectors need to be swapped with one another. otherwise every time you go in neutral your reverse lights go on. otherwise, its a plug and play deal. even with all 1.6 stuff. i still run a 1.6 clutch on mine.

__________________
1990 Miata: 6 speed, 3.90:1 miata/rx7 frankendiff with lsd, 1.8 driveshaft and axles, td05h big 16g @ 12-14psi, 440cc LOW IMP injectors on a emb, 255lph walbro, yada yada... 180k mile stock 1.6, 192hp 186tq.
elesjuan is offline   Reply With Quote
Old 02-11-2008, 05:41 PM   #18
Elite Member
iTrader: (3)
 
AbeFM's Avatar
 
Join Date: Aug 2006
Location: San Diego, CA
Posts: 3,048
Total Cats: 8
Default

Quote:
Originally Posted by soflarick View Post
Shifting is smooth. The additional gear may be better for track use as it will probably maintain the rpms better than the 5-speed, heel and toe seems a little easier since I don't have to blip the throttle as much, less rpm change between gears with the 6-speed. I have to get used to shifting into the additional gear, and also that 4th gear is like 3rd with the 5-speed, etc. I notice I drive with the rpms a little higher than I used to. I think the 3.63 gears would be pretty darn sweet with this transmission. I am still running the 3.90s.
Thanks for the impressions! I've been wanting to do this for about ever. I have the 3.6 gears sitting in a box, going from a 5 speed with 4.1 (4.3?) to a 6 speed with 3.6 should be amazing - it'll make 2-4 just a bit lower, 5th about the same, and 6th a bonus gear! Which will mean 2nd will be a bit less useful, since right now it's my "you thought you could hang with me?" gear since it's so tall it just keeps giving.

Odd you run around higher reved - I guess the next gear isn't worth getting into yet? what year car is it out of? I've heard the 6s aren't as smooth and good to shift, which has been the major reason I've been holding off.
AbeFM is offline   Reply With Quote
Old 02-11-2008, 06:25 PM   #19
Senior Member
iTrader: (8)
 
Join Date: Mar 2006
Location: Floriduh
Posts: 882
Total Cats: 0
Default

I have to get used to the 6-speed, not that I enjoy revving the engine more than needed. I only have about 150 miles on it right now, and a few times I've noticed myself not shifting into the next gear, I assumed it was from my habit of driving 5-speeds all the time. My 6 shifts pretty darn smooth, maybe not as precise as I'd like, but pretty darn smooth. I've also been skipping gears. With the 3.90s the gears rev out more quickly than the 5, so I've been going from 1 to 3 or 2 to 4. I had a short shifter on the 5-speed, so I can't recall how smooth it shifted with a stock shifter. Getting into reverse seems to takes a little more work than with the 5. So far I am pleased with it. I hope it is as tough as other people have said. The case is definitely stouter than the 5-speed's. I have to look at the paperwork, but I am pretty sure it's out of a 2002. It had about 11k miles on it when I installed it, according to seller.
soflarick is offline   Reply With Quote
Old 02-11-2008, 07:29 PM   #20
Elite Member
iTrader: (3)
 
AbeFM's Avatar
 
Join Date: Aug 2006
Location: San Diego, CA
Posts: 3,048
Total Cats: 8
Default

What did you pay for it?

Oh, man, I bet the long shift is a killer. I have a C's short shift (mazdaspeed) on my five, and it still feels too long, but livable. It's a displaced fulcrum, not just a shortened arm.

I guess that's the other thing keeping me out of a six. Then again, maybe with the extra row in there, it makes more sense?
AbeFM is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:40 PM.