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12-06-2011, 07:25 PM | #23 |
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ZK, nice of you to post your video.
You really need to take a course that gets into appropriate racing lines, managing weight transfer, etc. From what I see in your video, you could probably gain most of that 3-second deficit in a couple of outings, but you'll have to focus and concentrate a lot to totally close the gap. Still, it looks like you're having fun and that the whole point. Keep at it and try to get some instruction from successful drivers. Dave
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12-06-2011, 10:58 PM | #24 | |
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It was actually my first runs in this car so I was not used to the lack of grip and weight shifting from a stock car. It was very different than a car set up for autocross class-specific competition. I got better. Those runs were more like 7 seconds from the usual people I run with. I just posted it to show my learning curve when starting. Here is my 2nd event in the BMW. A lot smoother. Here's an old event in my previous car. Suspension is set up with HKS Hipermax III coilover suspension, custom alignment specs and set up with AD08 Neova tires, dyno tuned for 380hp, 400 ft/lb torque on stock boost map, BBS lightweight forged wheels. Last edited by Z K; 12-06-2011 at 11:12 PM.. |
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12-06-2011, 11:23 PM | #25 | ||
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12-06-2011, 11:29 PM | #26 |
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Sounds good. I did an initial fit-check with them, without driving the car, and they cleared in front on the stock rear wheels, whose offset difference is legal -- so I think we will be good to go.
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12-07-2011, 07:25 AM | #27 |
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If they fit up front on the 9.5's they'll definitely fit on 8.5's so that's good to hear. You probably know this already but make sure you use the 8.5's up front if you're running Stock, the offset difference is fine but the width isn't. I did some measuring now that I have the 295's in my hands and they're only about 5/8" wider than the 275 Contis I have on the rear of the car, and there's more than 1.75" of extra clearance back there. Looking good for the 315's. My measurements tell me ET29 is going to be just about perfect in front but the rear might need more like ET27 or so, which would put me in an interesting custom spacer predicament with the tire rack ET35 9.5's. Too bad those BBS Motorsport rear wheels from the GT4 are 10's as they would be perfect with a 15mm spacer.
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Last edited by Richbot; 12-07-2011 at 07:32 AM.. |
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12-07-2011, 09:10 AM | #28 |
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would vs motorsports e92 scca race car be something close to what you are looking for?
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12-07-2011, 10:21 AM | #29 |
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Touring 2 is prepped to a totally different ruleset. If Showroom Stock still had a class for cars as fast as ours, cars prepped to those rules would be allowed to run in SCCA Solo2 Stock class. Touring allows a lot more stuff so those cars go in their respective Street Prepared class.
I am watching their build closely though, partly because I was somewhat involved in getting the car classed in T2 and partly because they race in my neck of the woods and I'll get to see the car on track when I'm racing the SRF.
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12-07-2011, 11:46 AM | #30 |
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There really is oodles of room in the rear. As seductive as 315 rears would be, I expect the 'square' setup (295s all around) will prevail, on most courses anyway.
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12-07-2011, 02:53 PM | #31 |
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That's just your tire guy's laziness talking. I agree the 295's all around should be pretty good, especially with the stock suspension setup. That's why I won't be sad if the 315's won't work, but I think they will. And I'd rather start with as much tire as possible and tune my way into the balance with alignment, bar, and shocks than do the same with the 295's all around and have to start over if I find out I need more tire. I have a feeling the 315's with a little more camber will be helpful in slaloms where this car tends to wag its tail a little too much.
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12-07-2011, 03:22 PM | #32 | |
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12-07-2011, 05:46 PM | #34 |
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Lol - technically 'square'!
You know, granted the efficacy/legality of mounting massive tires on skinny wheels, I have always found it aesthetically offensive. The purist in me favors a rule that would keep tire section widths close to wheel widths. |
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12-07-2011, 06:43 PM | #35 |
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I agree. The showroom stock class rule seems appropriate. Max 20mm variance in section width compared to stock would still give people plenty of leeway to find a tire that works without the pinched silliness
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12-07-2011, 10:43 PM | #37 |
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SCCA lost that venue. Lots of complaints from the field owners about the cars being too loud and bothering the horses there. That surface has a lot of grip but eats tires as you know... they never repaved it.
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12-08-2011, 12:39 PM | #39 |
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They just host it at a couple of places: Oakland Coliseum, San Francisco Candlestick Park and Marina Airport in Monterey. Candlestick Park is by far the worst autocross site ever. There's bumps, jumps, grass growing from the ground, glass and bottle caps all over the lot. It's more like a rallycross course than autocross. Marina is pretty far from San Francisco so there's really only Oakland left.
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12-21-2011, 11:03 PM | #40 | |
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Lord, save yourself and your money on this build. Oh, it will be fun, but you are going to need a National trophy level driver to make a case to the seb, so who are you going to put in the car? (Andy?) You will have some of what you are seeking in a stock this year with the American v8's in the boss 302 is in a stock and probably just as out gunned as the e90 m3. If you run the mid-div events in kc and Stl, you will get to bump heads with a 1m with at least one driver that is picked to win his class at nationals most years in sports car magazine. I think you will have fun. I only autocrossed in an e90 once and the arm rest crowded me. How do you feel about the seat in the e90? Do you have room/space for yor arms? It kept bumping my elbow.
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Last edited by m3kerry; 12-22-2011 at 05:49 AM.. |
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12-22-2011, 10:53 AM | #41 | |
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I havent noticed any issues in the interior it fits me pretty well. Seats are great much better than the sport package seats in the non-M cars. The shoulder support makes a big difference
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Last edited by Richbot; 12-22-2011 at 11:15 AM.. |
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12-23-2011, 08:19 AM | #42 | |
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Second thing that comes to mind is front camber on the M3. Having had a number of years experience with an E46 ZHP in D-stock, the front camber issue is the biggest handicap -- all from a tire wear standpoint ($$$). The most the E46 can get is just a bit over -1.0 up front, maybe -1.2, with the pins out. We (daughter and I co-drive it a lot) were "fortunate" to experience cording outside edges of brand new A6s (~$275 each) in 16 runs. The V710 is a bit longer lasting, so I'd look at those if I was doing this M3 challenge. We ended up using BFG R1s to simply have fun and gets lots of runs out of them at local club events (which don't work too bad at all in typical summertime 95+F temps here). Good luck with the M3. I look forward to reading about your experiences with the car. Regards, Chuck
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12-28-2011, 08:52 AM | #43 |
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In light of the "fun" with cording hoosiers on M3's in the past the thing I'm counting on as I've said before is that the simple strut E46 front suspension design had pretty bad geometry compared to the E90's more complicated design. This car will still eat outside edges but it shouldn't be near as bad as the old strut designs were, plus I've already been able to get 1.6-7 degrees from the front with the pins pulled and I haven't even started loosening things up and yanking on it yet. But then it's a heavy car too. Oh well, here's hoping. Can always just flip them on the rim if they look ugly, I'm hoping I can get ~30 runs out of them before flipping them. The V710's are good tires and I have experience with them, that's a potential backup plan but I hope I don't need it, as the A6's are just plain better in most situations.
I think that 996 would be good too, more people need to bring them out. If SS wasn't so fun and well-populated I think AS would be a lot more popular but here we are. In case anybody is actually reading this thread for useful information, the 30mm RD Sport front bar is hollow but it's still about 1lb heavier than the stock bar. The stock 26.5mm front bar is hollow and has a more severe bend to clear the tie rod than the RD Sport bar. I think most of the weight difference comes from the big pieces of very thick plate for the adjustment holes. Interestingly, the RD Sport bar on its stiffest setting uses only about 1/2" shorter moment arm than the stock bar, and at full soft it's close to 1.5" longer than the stock moment arm. I'm using the Turner adjustable endlinks to take the preload off the bar, there was a surprising amount of preload in the stock bar for some reason. Interested to see what the cross weight looks like with the endlinks adjusted properly. 6 different stiffness settings should give me plenty of leeway to screw something up. Front bar was a big improvement on street tires. Lots more responsive to drop throttle in sweepers now and the car is more predictable in transitions (used to like to snap out in quick low-speed 2nd gear transitions). Gives me hope that balance might be close when the car tightens up from the extra Hoosier grip. Had it on the intermediate setting to start with, which is about 30% stiffer than stock Took me 30 minutes to get the preload out of the bar with the adjustable end links but it was worth it, cross weights are better now too. Very close to 50%
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Last edited by Richbot; 12-28-2011 at 08:07 PM.. |
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12-29-2011, 12:22 AM | #44 |
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Good to hear the bigger bar has settled the car down. I installed mine a couple of months back, but haven't had it out to an event since the installation. Its behavior on the street has seemed to foreshadow your experience, but there's no replacement for 10-tenths testing.
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