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As far as benchmarking the gt3, imo, the only choice for lsd is the os giken. And all clutch based lsds should run a diff cooler if pushed hard.
As far as helical gear lsds go, I still stand by it not being necessary to run a diff cooler, just change the fluid regularly and you’ll be gtg. I’m a big believer in keeping stuff as low maintenance and simple as possible wherever possible, less stuff to break and ruin your day. I will add one caveat to the above however, regarding the wavetrac, since it has carbon fiber plates in it and is a little bit of a hybrid type diff, a cooler might be helpful there, but for a traditional gear lsd like a torsen or quaife, I still say not necessary. |
Wavetrac's do wear out. Heard one clunking on a YouTube video, guy said it was done. LOL
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Didn't rusty's setup add something like $1000+ to the cost of the diff?(assuming not everyone can win a diff cooler at Z days)
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If you have to occasionally rebuild the wavetrac, better off just stepping up to a better performing clutch type diff like the osg from the get go. |
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+ some aero and your planned mods should put ya within striking distance with r compounds. Going to be hard to keep up with them on power. I'd think if you did every bolt on possible you could be with a 996 or 997. |
Are we talking about a GT3 street car as it rolls out of the factory (street tires, etc)? Honestly, I would be surprised if it turned a faster lap time on just about any track than my TT3 car on Hoosiers. A pro driver on some of the highest speed tracks might be able to put up a time I can't match....but I'm not sure (maybe something like Road America). I think I was about 2-3 seconds faster Summit than a 991.2 with Mike Skeen driving a few years ago, but I could be wrong.
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In the Carrera Cup series down under, 991.2 GT3's are running 1m34s at PI GP Circuit. These are slightly de-tuned from Stephane Ratel Series GT3's (which is the GT3 RS).
In a race event at the same circuit a few weeks ago, a road spec GT3, lightened and with a cage and 5 year old Pirelli slicks driven by a 62 year old amateur driver ran a 1m42s lap. Which are you comparing to ? At best, even the most highly modified Z34 with a 500+hp engine is not going to compete against a GT3RS (or a proper SRO GT3) without a shed-load of enhancements (1100kg weight, flat floor, splitter, wing etc) |
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BGTV8....I was initially looking to compare to a stock 991.2 (2015) GT3. I will be content to compete with the 996 or 997 to be honest. Again, I just want to be able to run confidently in the Advance Group and not be passed non-stop.
Appears that an a Diff Upgrade is very high on everyone's list to gain lap times. Will definitely begin researching this as my next major mod following my planned Ohlin Coil-overs this winter. Spec-Jay...A 3 sec gain from Diff sounds like a pretty big move. Is there anything special to your setup that enabled that type of gain...or do you think I could experience similar results on a track that I currently run 2:29.xx? |
Biggest upgrade in time is, and will always be, a big sticky tire. Aero, Diff and motorsports grade ABS round out the top 4. I run anywhere from a 275 to 315 Hoosier A on 11's. The diff is a custom set-up OSG. You can build a 370 or 350 to outrun a 991.2 (as it sits on the showroom floor) for a single lap for less than 50-60k including the price of the car. It will be fragile and a car that is not going to be ok to drive on the street, however.
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Actually you could just buy mine for a whole lot less than 50k and spend the difference on track days until you go fast enough haha...
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The factory vlsd is fine as on the street and I guess it's better than nothing, but as your grip and skill improve, it will let you down. |
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