The short answer is you are heading into the near perfect storm of overheating. No air density over the rad and ic, turbo and engine working harder to make less power, no humidity and usually high ambients. At FM, you can add in piss poor gas and a local track that is only .9 miles with lots of turns, so all boost off the turns and no actual speed to get airflow. At least you'll have speed, but in place you'll have duration to deal with.
Water/meth injection is your friend for sure. Also, *if* you could get an ic/radiator sprayer working without getting water on the rider or tire, would be good. I don't want to be the guy blamed for the wet tire, though... Just as a point of reference, in the same crappy conditions on our local kart track, the Westfield sees 25-30C intake temps at 15 psi with ic and water/meth, no ic spray. So nearly ambient intake temps. Car itself still wants to run hot, but I'd guess any bike motor has a more efficient cooling system than the Miata. As Mark said, IC heatsoak can be a killer and you'll be pulling all kinds of timing based on airtemp if/when it happens. Bill Cardell TurboDog's Dad Flyin' Miata 1-800-359-6967 (sales) 970-464-5600 (tech support) www.flyinmiata.com www.fmwestfield.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Eric Schieb Sent: Friday, August 28, 2009 7:54 AM To: Miatapower Subject: Re: turbos and altitude NMC but turbos and power MC:>Also, at high load short burst, the intercooler is going to act more like a heat sink than a heat dissipation device. And the air is thin so does not do as good a job of cooling. MC:>same amount of boost comes at a higher turbo RPM The first thing that this brings to mind is intake temperatures (due to the high ambient temperatures and the high pressure ratio on the compressor). Are there any good rules of thumb regarding inlet temperatures? thanks, Eric Schieb Mark Cookson wrote: > The only point of interest I can offer is that the same amount of > boost comes at a higher turbo RPM (say 100k RPM instead of 90k RPM), > so be aware of over spinning the turbo (shaft end play, lubrication, etc). > Also, at high load short burst, the intercooler is going to act more > like a heat sink than a heat dissipation device. Adding mass to it may be useful. > If possible, bring water/alcohol mix to spray it down after a run, > but it's unlikely that you'll need any system on the bike during the run. > > Good luck, have fun, and stay safe! > > Mark > > On Thu, Aug 27, 2009 at 9:22 PM, Eric Schieb <[email protected]> wrote: > > >> I will be supporting a customer at Bonneville. He recently purchased >> a turbo bike with a standalone ECU that was tuned at sea level. As >> his engine tuner, what things do I need to consider as we head to >> Bonneville (high elevation, dry, hot)? >> >> Obviously we will be going for the maximum safe power. >> >> thanks for the tips, >> >> Eric Schieb >> _______________________________________________ >> Miatapower mailing list >> [email protected] >> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >> >> > > _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
