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      03-03-2012, 05:03 PM   #1
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zooming around laguna seca yesterday..

need new brakes after yesterday. They lasted 3 track days and 5000 miles..DCT started acting funny at the end of the day and threw some codes.. It didn't like cresting after the bridge before turn 2 and shifting. JB4 and 100 octane with DCI hung pretty well in the straights with some much faster cars.







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      03-03-2012, 05:29 PM   #2
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JB4 and 100 octane with DCI hung pretty well in the straights with some much faster cars.
Were you on map 1, 2 or 5? Oil temps?
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      03-03-2012, 06:51 PM   #3
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Were you on map 1, 2 or 5? Oil temps?
map 5. ~230ish.
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      03-03-2012, 07:44 PM   #4
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map 5. ~230ish.
Wow, cold... I'm not able to stay below 250 under hard driving @ an ambient of 80-85 degrees. Does it depends on my standard 35i BMW oil quality? Castrol 5-30 i believe... Do you use a diferent oil?
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      03-03-2012, 10:41 PM   #5
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Quote:
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Wow, cold... I'm not able to stay below 250 under hard driving @ an ambient of 80-85 degrees. Does it depends on my standard 35i BMW oil quality? Castrol 5-30 i believe... Do you use a diferent oil?
You must have oil coolers. I do 250 with in town stop n go driving. I saw 295 with 65 ambient last weekend (track day). Your standard issue oil is a premium grade and I say there's no additional thermal benefit with any different oil until you get heat conduction improvement with colloidal graphites or molys.....and additives are a no-no with our cars.

OP- G R E A T sharing! Congrats.
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      03-04-2012, 03:31 AM   #6
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standard 5w-30... 35is has better cooling and the car stays pretty cool from oil temp perspective. I also had maxcool turned on on my JB4.. brakes on the other hand is a different story. my rotors were glowing especially on pics after turn 2.
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      03-06-2012, 08:36 AM   #7
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      03-06-2012, 10:33 AM   #8
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awesome, what tires are you running? I hope Michelin Pilot Super Sports?
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      03-06-2012, 08:35 PM   #9
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awesome, what tires are you running? I hope Michelin Pilot Super Sports?
stock RFT's.. they are actually not bad when you heat them up..
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      03-06-2012, 08:43 PM   #10
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I thought they weren't that bad either, until I threw on some real tires . . . regardless, glad you had a ton of fun and what a great looking car.
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      03-08-2012, 02:02 AM   #11
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I thought they weren't that bad either, until I threw on some real tires . . . regardless, glad you had a ton of fun and what a great looking car.
I have the michelin pilot super sports on my M3 and Pirelli Trofeos on my Ferrari.. the track is definitely a good way to burn off the RFT's though..
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      03-10-2012, 09:05 AM   #12
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Awesome pics on the track
Why don t you upgrade to a performance brake kit?
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      03-11-2012, 07:46 PM   #13
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What speed did you achieve by turn 2?
I saw 120mph riding with Scott Pruett in a Dinan M3 last year. I'd guess your JBZ4 iS got on the straight at 40-50mph, hit 100 by the bridge and 120 before braking for turn 2.
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      03-13-2012, 06:54 PM   #14
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What speed did you achieve by turn 2?
I saw 120mph riding with Scott Pruett in a Dinan M3 last year. I'd guess your JBZ4 iS got on the straight at 40-50mph, hit 100 by the bridge and 120 before braking for turn 2.
indicated about 125mph but the speedo is probably pretty off.. I also didn't lift over the crest and the is gets a little light and scary..
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