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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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01-28-2016, 04:25 PM | #29 | |
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It can be said though, that the higher the preload the more stiff turn in will be. That being said though, LSD preload or initial torque (JDM speak) often gets a bad wrap as being the culprit for initial understeer or midcorner push. Some racers try to go overboard and have no preload. Preload is useful to make a mechanical LSD less reactive. Say if you were driving over wet roads or uneven surfaces. If you had no preload, the diff could begin to lock unpredictably. For many brands, preload is used assist the diff to get enough lock. Typically this is done when there is not enough surface area to get adequate lock. Too much preload, the diff will not allow for enough left-right "differential action" to allow the car to turn in smoothly, and can make the car feel "stiff". How much preload can the car tolerate typically depends on weight and level of grip. If you have r-comps or slicks, you would want more preload, etc... |
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01-28-2016, 04:28 PM | #30 | |
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Most people think OSG is a great part, however the price isn't for everyone. Thus other brands come into consideration, sure they are down some fancy engineering but get the job done for less.
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01-28-2016, 04:29 PM | #31 | ||||
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An Mac and a Windows computer can both word process right? An iPhone and Android phone can both make calls? I understand that you most likely have or are considering an OSG unit for yourself, and want to believe you made the best decision. The OSG is a great unit, but calling the Cusco inferior is simply wrong. In fact, by default the OSG uses 100% of the friction surfaces, while the Cusco only uses 60%, even with the grooves, and yet, achieves similar lockup behavior, so the whole surface area/disk count argument is moot. Because of the negative preload design, the OSG *needs* more area. It's constantly trying to unlock, while the Cusco is trying to constantly lock. Lets also not forget that the Cusco unit can use MUCH cheaper Motul Gear300LS ($26 retail) or Gear comp ($28 retail), while the OS Giken requires use of the OSG fluid ($50 retail). There are pros and cons to both differentials, but the fine details are beyond the scope of this thread. Ultimately, both work, and function well. The bombshell: the Cusco unit is designed by OSG, albeit to a different set of specifications. Hmmm... that only make the decision harder. Also, on a side note, LSD tuning for track use, and AutoX use, are completely different, as the cornering elements and styles are fundamentally different. |
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01-28-2016, 06:29 PM | #32 |
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I do not have an OSG in my FR-S due to classing.
I thought my explanations were in plain enough English for most and was to clarify some info regarding diffs, not to pick an internet fight. My intent was to not discredit the Cusco product, but to emphasis that it and the OSG units are not as similar as some may post. No one likes the idea that you have to fork out a ton of cash for performance. Many want to just think of aftermarket LSDs as simple commodities and just look at "type", X-way, and costs. For most street drivers or occasional track users, it may not really matter. For those who are looking to compete and win trophies, cash prizes, and/or make a living racing it does. If you are looking to actually win something, it is best to understand what you are buying regardless of what brand. |
01-28-2016, 08:42 PM | #33 | |
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Pay really close attention to the track where you are braking loose there in T2. I'm "Dev" on the ARMS forum and run at AMP as well. You're braking loose right as you transition from concrete to pavement. There are also a couple bumps there to boot. You;re doing T2 the way I used to do it and I always found it really awkward. I've since changed my line and I'm far more smooth. Edit: Actually if you watch your vid close enough it would appear (to me) that your front end nudges wide just as it passes that point as well. Hard to tell for sure though without the steering wheel in view.
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2013+14+15 Atlantic Region Motor Sports Overall Autocross Champion 2017 Bluenose Autosport Club Overall Rallycross Champion Powered by Great North Performance, Jani-King Canada, and OK Tire. Last edited by Thorpedo; 01-28-2016 at 08:52 PM. |
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01-28-2016, 09:57 PM | #34 |
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Thanks for the heads up Dev. Hope to see you out next season. What's your new line in two? Enter wide?
I'm actually quite enjoying the detail you are all going into on the units. I am definitely going to be wanting one of those two units. Both sound great. The more back and forth discussion that goes on the better for me making an informed decision. Knowing things like OS Giken doing setup and rebuilds as well as gear oil being much cheaper for the Cusco are both great examples of those tidbits I'd have never known otherwise. |
01-28-2016, 10:00 PM | #35 | |
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01-28-2016, 10:11 PM | #36 | |
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I've seen *one* cusco unit wear enough to need a rebuild, but that was more a result of overheating the differential, rather than the differential itself actually wearing out. Note that this was on a different platform that has a *TINY* differential, and the overheating was a result of multiple drivers flogging the car, back to back, with no time for the car to rest. |
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01-29-2016, 11:43 AM | #37 |
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Kaaz has there new line of Super Q LSD's that come with WPC treated internals, pretty cool.
Sure you can have any parts WPC treated but coming in the box already done is nice. "The new Super-Q units are designed to perform at lower operating sounds and overall superior total performance. Some features are as fallows: Dramatically reduced chattering noise, Excellent Heat Dissipation, Smoother Engagement, longer life-wear, and no break-in period required! These new features along with KAAZ’s standard characteristics of lightning fast reaction time, adjustable engagement settings, and virtually hassle free operation make the new Super-Q LSD a must for all vehicles. Whether your vehicle is a daily driver, weekend warrior or full on race car, the new Super-Q LSD is fitted for all styles of performance operation! SUPER Q UNITS ARE AVAILABLE FOR ALL KAAZ L.S.D MODELS AND APPLICATIONS! CALL NOW!"
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02-08-2016, 09:05 PM | #38 |
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The Super Q sucks for track duty.
We had that before we got a custom cam which works much better. |
02-08-2016, 09:33 PM | #39 |
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How so?
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02-08-2016, 09:59 PM | #40 |
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What is/are the consequence/s of using non-OSG oil in a OSG diff?
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02-08-2016, 10:56 PM | #41 | |
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No different from using oil that deviates from the factory fill from the engine. Most diff oils are not 250 weight. You wouldn't use a 5 weight in your engine, would you? |
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02-09-2016, 01:04 AM | #42 |
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