proxlamus© Posted August 28, 2005 Share Posted August 28, 2005 http://www.gurneyflap.com/bmwturbof1engine.html It's on a BMW F1 engine... BUT WHY?! I don't get it.. it's weird Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted August 29, 2005 Share Posted August 29, 2005 Would love to know how that works but who can argue with the results: "Qualification: maximum of 5.5 bar with Benetton cars: about 1300hp" That's about 80# boost and .87hp PER cc and the Honda engine made a tad more hp. Thanks for posting that. The craftmanship is mind-boggling. It also reminded me of some of the brave men who drove those cars. Quote Link to comment Share on other sites More sharing options...
oinojo Posted August 29, 2005 Share Posted August 29, 2005 i believe its to eliminate any kind of boost lag...since there is no throttle body after the turbo....there is no need for a BOV and no chance of compressor surge. Im just thinking this logically... i honestly dont know whats up with that. Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted August 29, 2005 Author Share Posted August 29, 2005 As you can see from picture #1 the engine has individual TB's (note the linkage) you can see the orange cable going from the linkage, the same cable attached to the TB in front of the turbo in pic #2. When the ITB's close, so does the one before the turbo, shutting off airflow to the turbo. With no more air coming in, the turbo spins in somewhat of a vacuum allowing it to sustain rpms (no air to slow it down). This is one form of anti-lag system (another being dumping fuel into the turbine on lift, WRC-style) used in different types of racing. =) Quote Link to comment Share on other sites More sharing options...
Confused Posted August 29, 2005 Share Posted August 29, 2005 Wow. Ive never seen anything like that. Quote Link to comment Share on other sites More sharing options...
TheNeedForZ Posted August 30, 2005 Share Posted August 30, 2005 Vacuum allows the turbine to keep spinning....hey that's what I was guessing. Is there any draw back to that system? If not then why don't all the turbo cars use this system instead of adding a BOV? Quote Link to comment Share on other sites More sharing options...
Dave88SS Posted August 30, 2005 Share Posted August 30, 2005 Vacuum allows the turbine to keep spinning....hey that's what I was guessing. Is there any draw back to that system? If not then why don't all the turbo cars use this system instead of adding a BOV? I would think the vacuum was cause the compressor to stall, wouldn't you be more likely to overspin the turbo in that condition? /I'm violating the 'no technical thinking before 8am rule', bear with me Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted August 30, 2005 Author Share Posted August 30, 2005 Tony D mentioned that a turbo spinning in a vaccum has it's disadvantages The reason for the throttling before the turbo is the SAME reason the CART people do it: they have a blowoff valve on the inlet manifold. If it lifts, you LOOSE POWER, and have a good chance that it will not reseat. The throttling of the turbocharger inlet insures that the boost will NOT lift the pop vavle, allowing you to run the absolute maximum ammount of boost, without EVER chancing a boost-spike that would blow your valve. I discussed this earlier with someone who wanted to argue about conterflow injection, and grinding sparkplug tips... Anyway, the added advantages of running the turbo under a vacuum aren't that great, because you then have to use another seal to keep oil from getting sucked into the compression chamber---the main reason is to not lift the blowoff valve. The CART engines use Barrel Throttles, BTW, not butterflies. There is no throttle shaft in the way to disrupt the airflow---this may be the same in the engine pictured, I haven't looked. CG and simplicity of operation has nothing to do with it, it keeps pboost under the popoff level no matter what. Quote Link to comment Share on other sites More sharing options...
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