BC:>you'll have duration to deal with Yep, the FIRST timing light is 4.5 miles from the place you launch. That is a relatively long distance at wide open throttle.
Regarding any hardware: I need to learn about the potential hardware; however, the first time I will see the bike is on the salt flats. I will not get much input on the hardware for 2009. Maybe 2010. I suspect that the IC is in an ice bath but I am not sure. When I worked on a record setting pickup truck (224 mph), we used a huge ice water container in the bed for engine cooling. BC:>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. I need to get into the right mindset . . . If the intake air temp gets too hot (number?) I will need to cut timing to prevent detonation. Cutting timing will increase exhaust temps. This will increase turbo inlet (and exhaust valve temps). Presumably boost and detonation will increase unless I get the boost down or find a way to keep intake temps in a reasonable window. Did I get it right? Eric Schieb Bill Cardell wrote: > 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
