OS Giken gear set for FD
Does anyone have track experience with these gears? I ran the ratios through a calculator and even with a 4.7 rear end they are extremely tall (think 1st goes to 50mph+) and I'm not sure if I would like them ontrack if I had to go down into 1st for some really slow corners, since the syncro won't let you in unless you're doing 15mph so I'd have to double clutch.
-Andy |
I don't know much about the OS Giken ratios but there are other options in that price range...
Quaife... http://www.autotech.com/quaife/index2.htm Guru (Australian)... http://www.xtremerotaries.com/main2/guru/gearbox.htm The above list gear ratios for comparison. There are other Japanese gear sets but most are even more expensive. |
Ok, Ive seen the Guru gears before, I don't want them as it converts to dogbox, but I didnt know Quaife had a set for the FD, I'll run them through the calculator. Thanks
-Andy |
Grassroots Motorsports just did a comparo of rear diffs on a Honda S2000 - stock Torsen vs. OS Giken vs. Kaaz. Might want to check it out.
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Originally Posted by gracer7-rx7
(Post 8869731)
Grassroots Motorsports just did a comparo of rear diffs on a Honda S2000 - stock Torsen vs. OS Giken vs. Kaaz. Might want to check it out.
-Andy |
fwiw - most people I see changing rear gear ratios are either autox or drag guys.
IMO: Unless it is a full on race car or autox/drag car where every lap counts, I just don't see going to 4.7 as worthwhile IF you do a fair amount of street driving. I'd probably go no higher than the 4.3 of the JDM cars. I'm perfectly happy with the stock 4.10 with the shorter 5th gear of the JDM / 99+ tranny. Its up to you though. I've been up to my eye balls in work and life. Besides that Fd has been fine and I've been driving it on Skyline whenever I get a chance. Haven't turned a wrench on it in months other than re-installing my Konis after Tripoint rebuilt and revalved them. Looking forward to a good amount of track time in 2009. Good luck with the build. |
Originally Posted by gracer7-rx7
(Post 8870677)
fwiw - most people I see changing rear gear ratios are either autox or drag guys.
IMO: Unless it is a full on race car or autox/drag car where every lap counts, I just don't see going to 4.7 as worthwhile IF you do a fair amount of street driving. I'd probably go no higher than the 4.3 of the JDM cars. I'm perfectly happy with the stock 4.10 with the shorter 5th gear of the JDM / 99+ tranny. Its up to you though. I've been up to my eye balls in work and life. Besides that Fd has been fine and I've been driving it on Skyline whenever I get a chance. Haven't turned a wrench on it in months other than re-installing my Konis after Tripoint rebuilt and revalved them. Looking forward to a good amount of track time in 2009. Good luck with the build. Cool, did you go with the Tripoint coilover conversion? I'm going to give the RE-A DG-5 coilovers a try, but I was also interested in the tripoints. Lately I've just been enjoying the easy stock nature of my M3. |
a friend used the OS giken gear ratio. If you are planning over 500whp you will end up braking it...
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Originally Posted by R-R-Rx7
(Post 8872687)
a friend used the OS giken gear ratio. If you are planning over 500whp you will end up braking it...
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The OS Giken should produce more friction than the stock Torsen. What that would do to the longevity of the various parts of the rear diff is beyond me. People say the stock FD dif will also break under high HP so go figure...
I don't have the expensive Tripoint setup using the Koni race shocks. I just had my off the shelf Koni Sport adjustables rebuilt and revalved to the spring rates I was using. |
Originally Posted by aoc007
(Post 8872881)
Really, I thought it was supposed to be stronger than the stock gears and they can handle 600?
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Originally Posted by R-R-Rx7
(Post 8873320)
what makes u need one anyway? You can achieve the same results with a lot lower budget with a shorter gear ratio
Originally Posted by gracer7-rx7
(Post 8873054)
The OS Giken should produce more friction than the stock Torsen. What that would do to the longevity of the various parts of the rear diff is beyond me. People say the stock FD dif will also break under high HP so go figure...
I don't have the expensive Tripoint setup using the Koni race shocks. I just had my off the shelf Koni Sport adjustables rebuilt and revalved to the spring rates I was using. |
^Good explanation. Learned something new. :)
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I wish Quaife made a diff for the FD.
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Anybody know the part number to the 99 spec fifth gear?
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Its the same as a TII I believe
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Hmm, interesting, thank you sir.
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OS Has impeccable quality. I would deff lean toward their products.
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I know of someone over here who runs this gear set and is very impressed with it
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Originally Posted by afgmoto1978
Anybody know the part number to the 99 spec fifth gear?
normal overdrive 5th (17-611), R523-17-610 jap spec to suit 16" wheel R507-17-610C.....to suit 17" wheel R512-17-610B....were about 11,900 yen before tax. countershaft overdrive (17-308), R524-17-308 jap 16", R507-17-308......17", R513-17-308 ~ 7550yen.
Originally Posted by afgmoto1978
I wish Quaife made a diff for the FD.
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Nice, thank you sir.
I would be so down for that, but knowing how little the 7 community knows of Quaife and their product, few would sign on. Even though they would be getting a diff that's superior to the clutch type units. What was the company who did it if you don't mind me asking? |
Company was Pfitzner in South Australia, going off rough memory of someone else's swap a couple of years back, think a figure around aud$1~1.5k was the going rate, but they wanted a run of 10(?) units. No idea if they change the bias ratio....apparently will guarantee against breakage though. Contact should be Tim Possingham if you want to email them, he was the Mazda gearbox guy about 3 years ago at least....unless he's left in the meantime.
Found out the 17" wheel 5th gear ratio is .763, so in between the .806 base domestic and .719 export market ratios. Here's the plot with standard tyre/diff combos for the relevant models... http://img99.imageshack.us/img99/145...parisontz1.jpg |
Originally Posted by aoc007
(Post 8931607)
Its the same as a TII I believe
Dave |
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