Boss frog 4cyl Diff Swap - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 07-17-2011, 11:13 PM   #1
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: las vegas
Posts: 244
Total Cats: 4
Default Boss frog 4cyl Diff Swap

Has anyone tried this setup? I'd love the gearing options this would give with the 8.8 differential. Seems a bit pricey though.http://www.bossfrog.biz/Differential_Swap.html
hochkis is offline   Reply With Quote
Old 07-17-2011, 11:26 PM   #2
Senior Member
iTrader: (13)
 
Join Date: Sep 2006
Location: San Diego
Posts: 606
Total Cats: 0
Default

Are you at the power levels that you're breaking rear ends daily? If not, I'm sure that the stock 1.8 rear end with 3.63, 3.9, 4.1, and 4.3 ratio options should suit you fine. I'm sure your HS guidance counselor told you that it's cool to be different, but damn that's some $$ that could be spent on more useful stuff like suspension if you don't have the power to break miata diffs just by looking at them.
jasonrobo02 is offline   Reply With Quote
Old 07-17-2011, 11:28 PM   #3
Elite Member
iTrader: (41)
 
Join Date: Jan 2006
Location: Seabrook, TX
Posts: 2,409
Total Cats: 19
Default

The only people who really need this are people who run drag with high hp cars IMO. Wheel hop is what kills torsens.
rharris19 is offline   Reply With Quote
Old 07-17-2011, 11:33 PM   #4
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: las vegas
Posts: 244
Total Cats: 4
Default

Quote:
Originally Posted by jasonrobo02 View Post
Are you at the power levels that you're breaking rear ends daily? If not, I'm sure that the stock 1.8 rear end with 3.63, 3.9, 4.1, and 4.3 ratio options should suit you fine. I'm sure your HS guidance counselor told you that it's cool to be different, but damn that's some $$ that could be spent on more useful stuff like suspension if you don't have the power to break miata diffs just by looking at them.
Oh, i'm not "really" considering getting one, I'm barely pushing 200whp. Just curious if anyone had tried it. Did not realize there was 3.63 ratio available for the 1.8 rear though? Link?
hochkis is offline   Reply With Quote
Old 07-17-2011, 11:36 PM   #5
Senior Member
iTrader: (13)
 
Join Date: Sep 2006
Location: San Diego
Posts: 606
Total Cats: 0
Default

Quote:
Originally Posted by hochkis View Post
Oh, i'm not "really" considering getting one, I'm barely pushing 200whp. Just curious if anyone had tried it. Did not realize there was 3.63 ratio available for the 1.8 rear though? Link?
No linky. I think you can buy them from Mazda or you can score a junkyard 626 or something. Hit up the search feature here and it'll tell you way more than I can. I got a r+p set sitting in my garage waiting for me to install from whatever 80's 626 or whatever it came from.
jasonrobo02 is offline   Reply With Quote
Old 07-17-2011, 11:46 PM   #6
NB/VVT Connoisseur
iTrader: (23)
 
viperormiata's Avatar
 
Join Date: Aug 2008
Location: Key West
Posts: 6,072
Total Cats: 253
Default

I've been considering one in the future so I can make better use of a 6 speed. Even with the 3.636 it's not nearly what I want/need.

Of course the fun part is trying to figure out a way to keep the cost down with the Boss Frog pieces vs. building your own, what parts you really need, having axles built instead of paying out the *** for theirs, yatta yatta
viperormiata is offline   Reply With Quote
Old 07-18-2011, 12:34 AM   #7
Elite Member
iTrader: (12)
 
Join Date: Apr 2008
Location: Springfield IL
Posts: 2,750
Total Cats: 24
Default

Go to V8R for the 8.8/CTS setup or Monster Miata with the 7.5. Much better designs from both those companies.
chpmnsws6 is offline   Reply With Quote
Old 07-18-2011, 01:00 AM   #8
Junior Member
Thread Starter
 
Join Date: Oct 2010
Location: las vegas
Posts: 244
Total Cats: 4
Default

Quote:
Originally Posted by chpmnsws6 View Post
Go to V8R for the 8.8/CTS setup or Monster Miata with the 7.5. Much better designs from both those companies.
well those would be great. They don't have any way of mounting stock miata transmission without the ppf. but I suppose a mix between the boss frog transmission mount kit and 1 of the other companies differential mount would work.
hochkis is offline   Reply With Quote
Old 07-18-2011, 01:05 AM   #9
Elite Member
iTrader: (12)
 
Join Date: Apr 2008
Location: Springfield IL
Posts: 2,750
Total Cats: 24
Default

Contact Bill at Miataroadster and talk to him about it.
chpmnsws6 is offline   Reply With Quote
Old 07-18-2011, 10:24 AM   #10
Elite Member
iTrader: (46)
 
Stein's Avatar
 
Join Date: Dec 2007
Location: Nebraska
Posts: 4,812
Total Cats: 138
Default

Quote:
Originally Posted by viperormiata View Post

Of course the fun part is trying to figure out a way to keep the cost down with the Boss Frog pieces vs. building your own, what parts you really need, having axles built instead of paying out the *** for theirs, yatta yatta
Yap. $100 diff from a 94-97 V8 Thunderbird, gears of your choice, $150 labor to install trac lok and gears, two $120 axle/CV's from Factory Five Roadsters and a "bit" of fab work and I have my own all new 8.8 diff setup for about $500. Sell the Torsen and actually be money ahead.
Stein is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Another Cast Manifold Corky Bell Prefabbed Turbo Kits 18 11-22-2016 10:01 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
VR6 to Miata Swap ScrapinMX5 Meet and Greet 8 09-28-2015 02:04 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 11:53 PM.