First Fiat 124 in the world....with OSGIKEN Competition 24 Disc Limited Slip~! - Fiat 124 Spider Forum
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post #1 of 5 (permalink) Old 06-18-2017, 05:11 PM Thread Starter
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First Fiat 124 in the world....with OSGIKEN Competition 24 Disc Limited Slip~!

We had the Miata limited slip in our Classica, it worked okay, now testing the OSGIKEN Competition 24 Disc Limited Slip. We have used these in our higher powered Miatas for many years, this has always been our choice when putting down over 200 hp, a great choice to support our continuing development of the car. I raced the car today at BMW Autocross. Did it on street tires in STR trim, fastest street tire time of the day (got beat for overall Top Time of Day only but a few friends on Hoosiers...by about one second). Will test it again next time on set of Hoosiers. My jump in time from Rivals on the car today to Hoosiers is usually about 2 seconds, so I expect the mighty Fiat will be Top Time of Day at next BMW Club event....will see. The feel of this unit is more aggressive than stock, takes a little time to understand that you mash the throttle and need to trust that when the rear steps out at corner exit it will then lay power very effectively, reaction is a bit faster than with the conservative lockup rate of the stock unit.



Brian Goodwin
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Last edited by Good-Win Racing; 06-18-2017 at 05:27 PM.
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post #2 of 5 (permalink) Old 06-18-2017, 05:53 PM
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Mahalo for the intel...you go get them beemers!!!

Aloha! !! !!!!
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post #3 of 5 (permalink) Old 06-18-2017, 06:50 PM
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Quote:
Originally Posted by Good-Win Racing View Post
We had the Miata limited slip in our Classica, it worked okay, now testing the OSGIKEN Competition 24 Disc Limited Slip. We have used these in our higher powered Miatas for many years, this has always been our choice when putting down over 200 hp, a great choice to support our continuing development of the car. I raced the car today at BMW Autocross. Did it on street tires in STR trim, fastest street tire time of the day (got beat for overall Top Time of Day only but a few friends on Hoosiers...by about one second). Will test it again next time on set of Hoosiers. My jump in time from Rivals on the car today to Hoosiers is usually about 2 seconds, so I expect the mighty Fiat will be Top Time of Day at next BMW Club event....will see. The feel of this unit is more aggressive than stock, takes a little time to understand that you mash the throttle and need to trust that when the rear steps out at corner exit it will then lay power very effectively, reaction is a bit faster than with the conservative lockup rate of the stock unit.


Hi Brian
Great results!
Are you still running the 2.9 mazda gears or have you switched back to the 3.5 Fiats?

Jason

17 Abarth, manual, luxury group, Rosso Red. Progress Springs, V1 intake, DV+ diverter valve, TR Motorsports FF10 wheels, Pirelli Pzero+ 215/45/17, GWR full Abarth Exhaust, Wilwood BBK
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post #4 of 5 (permalink) Old 06-18-2017, 07:04 PM
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OS Giken diffs are awesome. traction everywhere. It's hard to grasp how much better they are than something like a Torsten or quaife without actually trying it out. More power sooner everywhere. Very streetable (progressive) for a clutch pack when set up properly too. Expensive but one of those secret weapons I've seen the fast guys use.
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post #5 of 5 (permalink) Old 06-18-2017, 07:56 PM Thread Starter
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Originally Posted by jpwfz6 View Post
Hi Brian
Great results!
Are you still running the 2.9 mazda gears or have you switched back to the 3.5 Fiats?

Jason

Our stock rear 'Fiat' housing went all the way to Japan for OSGIKEN to engineer the new setup and then came back in pieces. We put it together with the original 3.4. Thus, our days with the Miata super tall 2.9 rear are over for now. At the autocross today the old 2.9 setup would have stayed in 2nd gear more of the time, the new setup with original stock 3.4 FDR needed third gear several places....but launched faster/harder from the tighter turns. It's a tradeoff.
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Brian Goodwin
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