![]() It's too damn nice to treat that way LOL. I like to drive the car as it's meant to be driven, but at the same time, not beat the sh*t out of it (even though it could certainly take it). I prefer rolling into WOT from about 10-15 mph. And yes, I know if I gave it more throttle and slipped the clutch, I could get the perfect launch, but I'm not trying to fry my clutch/shock the drivetrain. Just shows these cars are a little gutless below 3k RPMS. I thought for sure I was gonna spin like mad even with a moderate launch. I gave it moderate throttle and released the clutch, and to my surprise, even with the shorter 3.64 ratio, I didn't spin at all. ![]() Well, except for last week when I tried for the first time (in the Z3M). Surprisingly, the Michelins don't really spin even when I go WOT in first gear (they're some sticky tires!). I considered going wider too (maybe 255 or 265), but I don't want any rubbing issues. ![]() What do you guys think? Are there any other negative effects to doing this? Ultimately, it's a street driven car, never tracked, just want to make it a little more civilized without swapping the diff again. ![]() I know the negative side affects could be slightly worse handling due to the taller tire (about 1 inch), but I'm on KW V3 coilovers, so I'm lowered as is, and the way the car is set up is so that the rear end squats more than the front. Using those tire diameter/final drive ratio calculators online, I learned that I could effectively change the final drive in my car to feel more like a 3.50 (a difference of 0.14, or about a 28% change back to feeling more like a 3.15 from what I'm currently running). I'm sure I'd miss the 3.64 if I did go back to stock (I still have the stock diff), but I had the realization last night as I was about to order new rear tires (since my Michelin Pilot Sports are nearing the end of their life with less than 10k miles nonetheless!) that I could buy one size up (OEM is 245/40-17, but I'm considering 245/ 45-17). Long story short, yes, the torque down low is explosive in comparison to the 3.15, but it can get be a little much on the highway and I personally think the shorter ratio diff reduces some of the top end fun in the rev range. I currently have a 3.64 Torsen LSD in my 01 Z3M I had sourced from a used automatic Z3 2.5i. I've inquired about going back to the stock 3.15 diff ratio for some time. ![]()
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