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Old 06-11-2012, 11:39 PM   #41
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Corner exit. Find 1-2mph on every corner exit and 2 seconds is very easy to find.
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Old 06-12-2012, 12:22 AM   #42
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Where/what conditions is the giken gaining that much ground over the Torsen? In GRM's test a few months ago they actually lost time ... but I don't think GRM got as much out of the diff as the diff had to give. A number of their tech articles/comparisons lately have had some flaws.
Can you post a link or name the magazine/month for any of those articles?
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Old 06-12-2012, 12:51 AM   #43
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Quote:
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Where/what conditions is the giken gaining that much ground over the Torsen? In GRM's test a few months ago they actually lost time ... but I don't think GRM got as much out of the diff as the diff had to give. A number of their tech articles/comparisons lately have had some flaws.
I don't know how this is even a question, my Torsen hops and barks tires all day, erryday at the track...corner entry and exit.
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Old 06-12-2012, 01:59 AM   #44
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Can you post a link or name the magazine/month for any of those articles?
http://grassrootsmotorsports.com/articles/whats-diff/
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Old 06-12-2012, 02:23 AM   #45
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I subscribe to GRM, and it is the only car magazine I subscribe to. Overall I am relatively happy with their content. But they have dropped the ball a few times.

May 2010 - the 335i they decided they could upgrade to an M3 killer, for less than half the price differential. They claim victory at the track and yet their vehicle cannot complete more than 2 laps (iirc) before the ECU puts it into limp-home mode due to heat issues. Sorry, that's not a victory. Man up and say so.

I'm looking for the Giken article.

Edit: I don't think I have the issue anymore. The online version doesn't have any of the before/after times comparing the two differentials. It may be in the 8/11, 10/11, or 02/12 issues.

And part of my frustration with their articles is when they get something right, and identify a trend, and then don't pursue it. Perfect example: June 2011. Heavy wheels vs lighter wheels. They can't really find statistically significant differences. Then as an afterthought, they decide to test different tread widths on the same 17x9" wheels. They find that 245/40 is measurably faster, and overall felt better to the driver, than 255/40. Then - they stop there! Why not try continually smaller section widths to find where the curve drops off? Well-read members of this forum know on a 9" wheel 225 width generates the optimal grip for us. They should have continued the test.

Edit2. Unless there's a similar article with their 2010 mx5, Ciotti found the article I was thinking of, and I was mistaken. This entry for the mx5 mentions the installation of the Giken, and back-to-back testing, but doesn't give the results.
http://grassrootsmotorsports.com/pro...n-lsd-install/

Last edited by Mobius; 06-12-2012 at 03:07 AM.
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Old 06-14-2012, 06:34 PM   #46
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Not that their one test is conclusive but the results are inarguably in favor of the OS Giken. Ians comments on tire wear at Runoffs very telling.
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Old 06-14-2012, 07:28 PM   #47
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Not that their one test is conclusive but the results are inarguably in favor of the OS Giken. Ians comments on tire wear at Runoffs very telling.
I was planning on buying a cheap diff for my car until I read that...now I'm sad. Don't you have enough of my god damned money? Will you ever be happy?
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Old 06-15-2012, 12:29 AM   #48
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I was planning on buying a cheap diff for my car until I read that...now I'm sad. Don't you have enough of my god damned money? Will you ever be happy?
No
Yes
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Old 06-15-2012, 01:17 AM   #49
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Haha. That's funny.

I will paypal beer money to anyone who can find the text of the article in which they detail putting the giken into their 2010 MX5. I contend that in that article they show a slower time for their Giken than for their OEM Torsen. If I'm wrong, I'm wrong and someone gets a beer. Or three - hell, I never drink just one, why should you?

Edit: just so we're all perfectly clear here, because this is the interwebs, I am not contending that the Torsen is a better diff than the Giken.
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Old 06-15-2012, 01:23 AM   #50
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http://grassrootsmotorsports.com/pro...n-lsd-install/

They specifically discuss the inside rear wheelspin issue with the OEM Torsen, but no mention of going slower.

http://grassrootsmotorsports.com/pro...-championship/

They comment on the improved corner exit in that article, but again, no discussion about going slower.

The last two articles (most recent) for their 2010 MX5 mention nothing about the diff at all.

I have a taste for Belgian browns.
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Old 06-15-2012, 01:23 AM   #51
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Quote:
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No
Yes
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Old 06-15-2012, 01:36 AM   #52
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No, Andrew, no soup for you! The online text is not what was published in the pulp magazine. Beer money only goes to finders/posters of hard copy.
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Old 06-15-2012, 01:40 AM   #53
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No, Andrew, no soup for you! The online text is not what was published in the pulp magazine. Beer money only goes to finders/posters of hard copy.
Don't hate the player - hate the game
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Old 06-15-2012, 01:46 AM   #54
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First - apologies to Falcon for completely derailing his thread. I like the Motorcraft in the transmission, and I've been using M1 synthetic everywhere else. 0w30 for the engine. I changed it after two track days since I was so ungodly rich. Otherwise I change it when my idle PSI is at 15 or so. New, at temp, the oil idles at 25 so when it shears down to 15 I figure it's done.

Second - any of you people come to Portland, look me up, we will drink beer. I cannot keep up with the vast array of Portland microbrews and I will use any excuse to further my knowledge.

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I don't know how this is even a question, my Torsen hops and barks tires all day, erryday at the track...corner entry and exit.
This is interesting to me. I have never experienced this with my Torsen, nor the wheelspin issues indicated by GRM. Generally power on in a corner for me grips and pushes the front end a bit. When I have had wheelspin, it has been power-on oversteer, and the rear has rotated. But that's only been at autocross, on track the rear grips under power unless I have already blown the corner. I am at significantly lower torque levels than either Hustler or Savington ( I am guessing 165 at redline? 8psi), so that may be part of it. Also my current tires are RS2's, which are not as grippy as they once were. So perhaps it is just the combination of lower power and lower grip? Or perhaps diff oil selection also has a part to play in how the Torsen reacts?
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Old 06-15-2012, 02:54 AM   #55
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Diff oil doesn't have much to do with it - it's just the way Torsens work. They will move torque from the inside to the outside, but only if the inside has some grip. If you get the inside tire spinning, the Torsen can't move any power around, and all the power is wasted. Sticky tires make it worse (more body roll) as does more torque (easier to exceed the max torque that the IR can handle).
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Old 06-15-2012, 08:47 AM   #56
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I'm really getting tired of wanting a Giken but $2200 kind of sucks. If it buys me 2 seconds at Hallett though, I won't bitch.
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Old 06-15-2012, 10:30 AM   #57
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Laura and I would be agreeable to you removing the tampon from your dash for half that.
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Old 06-15-2012, 11:08 AM   #58
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Chris' suggested approach has the side benefit of solving lots of other issues as well.
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Old 06-15-2012, 11:34 AM   #59
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The tampon is coming out next season. I have to drive it to get it removed though, lol. I also don't think I'm going to match competitive TTB times in this car so feel free to use your mouths on my dirt-pipe. I'd bet an extremely large sum of money that a pro driver isn't going to run a 1:23 in my car at Hallett, 1:18 at MSR-C, or a 1:54 at TWS in my car.
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Old 06-15-2012, 11:41 AM   #60
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If the Torsen spins the inside wheel

then the Kaaz spins the whole car.
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