OS Giken Diff Review
#12
I'd have to look back and check on the cost, I ordered some fluids and stuff at the same time. I'm not sure if they're still running the group buy, but Matt(SpeedFreaksUSA) could probably get you a quote.
We did all the work ourselves, so there was no labor for the install, just $130 in bearings.
We did all the work ourselves, so there was no labor for the install, just $130 in bearings.
#15
What are your thoughts on low speed turn-in? And also, is it the recommended OS Giken settings? I'm sitting on one right now, but my local region runs much tighter courses than national style courses so there's more low speed elements than fast sweeper stuff.
#16
I have noticed the same increase in stability as you describe but possibly to a lesser extent since I chose to spec mine a little differently than the standard unit. The clutch pack type LSD really seems to help smooth out the the breakaway characteristics of the S2000 and as a result I think many people will find it easier to pickup the throttle sooner and reach closer to the limits with the added confidence as you describe.
An OSG car requires distinctly different throttle application compared to the factory diff. The Torsen is open on turn-in, or off throttle, allowing large variations in attitude through the early phases of the course. If throttle timing is wrong, the car oversteers. The OSG trailbrakes like a boss. The braking can be pushed deeper without fear of oversteer, and the longer I wait off throttle the more rotation I see. It is harder to "dance" the OSG, especially on the RE-71Rs, but it is so consistent and predictable that it more than makes up for it with extra throttle.
You will not be immediately faster by installing an OSG. However, it gives you opportunity for more throttle and better car stability and that will yield lower times.
#17
I've run a VLSD, a KAAZ 2-way, a NISMO 2-way and an S15 OEM Hitachi HLSD in a DSP classed 240sx, and the HLSD gave me the best results. I've now been driving and autocrossing an AP1 S2k for 2 years in B-Street class, but the HLSD in the AP1 is very different. During autocross, everything happens quickly and it comes across as snap oversteer. When driving the car on the street on some winding roads I figured it out. When going around a bend on power, I didn't really notice the steering being "tight", but when I would let off the gas, I could feel the HLSD unlock, the steering free up and the car would "turn in". I suspect the HLSD in the S2k either has more aggressive angles than the unit in the 240sx, or the suspension is more sensitive to the locking/unlocking characteristics of the HLSD. After that experience, I was more sensitive to it's action and was better able to adapt to it ("drive around it"). The advantage of the OSGiken is likely in it's consistent behavior compared to the HLSD.
#18
It is the recommended S2000 settings from OS Giken.
Originally Posted by SpeedFreaksUSA' timestamp='1454527813' post='23870565
I have noticed the same increase in stability as you describe but possibly to a lesser extent since I chose to spec mine a little differently than the standard unit. The clutch pack type LSD really seems to help smooth out the the breakaway characteristics of the S2000 and as a result I think many people will find it easier to pickup the throttle sooner and reach closer to the limits with the added confidence as you describe.
An OSG car requires distinctly different throttle application compared to the factory diff. The Torsen is open on turn-in, or off throttle, allowing large variations in attitude through the early phases of the course. If throttle timing is wrong, the car oversteers. The OSG trailbrakes like a boss. The braking can be pushed deeper without fear of oversteer, and the longer I wait off throttle the more rotation I see. It is harder to "dance" the OSG, especially on the RE-71Rs, but it is so consistent and predictable that it more than makes up for it with extra throttle.
You will not be immediately faster by installing an OSG. However, it gives you opportunity for more throttle and better car stability and that will yield lower times.