Pictures from weekend @ Willow Springs, too hot - questions... |
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Pictures from weekend @ Willow Springs, too hot - questions... |
siverson |
Jul 12 2004, 04:00 PM
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Advanced Member Group: Benefactors Posts: 2,448 Joined: 5-May 03 From: San Diego, CA Member No.: 654 Region Association: Southern California |
I spent the weekend at the NASA event at Willow Springs. It was pretty fun, and a very fast track - 125 on front stretch, about 105 or so on the back stretch. Turn 8/9 right at about 90/100 mph. Yowzers. I had never driven on that fast of corners before.
It think it was about 105 degrees out too, and my car started to get too hot in the afternoon sessions. I actually had to stop the 20 minute run sessions early. I was quite surprised by this, as I had previously been concerned that the car is running too cool on the freeways. Hmmm... I'm running a 3.6 with a front mounted Mocal cooler that's 20x6x2 or so. Another 914 there had a 4.0 (from a 3.6) with the factory C2 cooler under the rear trunk AND a front mounted cooler that was 16x6x2 or so. I think my DME programming might still be a little off (too lean) contributing to the heat. I'll have to check it out. Does anyone have any real world experience with the GT engine lids? Do they really make a cooling difference? Anything else to consider besides fuel/timing and engine lid before I start cutting away for a second cooler somewhere? -Steve Attached image(s) |
campbellcj |
Jul 18 2004, 12:28 AM
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I can't Re Member Group: Members Posts: 4,549 Joined: 26-December 02 From: Agoura, CA Member No.: 21 Region Association: Southern California |
I dunno all the answers to your great questions Howard (by any stretch), but IMHO yes it is "optimal" to get the aircooled engines to 210-230°F and hold them there. I suppose if you religiously change the oil and filter every 3K then it's not all that horrid if the car runs at 180-200 all the time, either. It's really the repeated 240+ conditions that we all should try to avoid, per most of the pro's. The -4's without auxiliary oil coolers seem to shoot up to 270-300 very quickly in hot track conditions so this is a very real issue for many of us.
Regarding the modern oils, I don't know what claims are actually made or proven by the manufacturers, but I have been led to believe that synths are "good" to 250 or above whereas dinos rapidly break down once they see 240-250 temps. It is an interesting topic, as my Audi regularly sees 225+ oil temps, and is a turbo car as well, yet the factory oil change interval is like half a million miles or something...call me "old school" but I usually change the oil about 2-3 times as often as "required" on most of my cars. |
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