| **** I am dissapointed if the new flow map is correct.**** Though I may disagree with some of your points --respectively -- I do concede that at a given rwhp at a certain boost level .. the car will be safer overall and last longer if u are able to make the same power at lower boost levels .. I think that this is one of your key and most important points. Dyno tuning and reaching a given psi is one thing. Using it on the street is another. I will seriously consider how much boost I want to use on a regular basis based on how long I want the turbos to last. Your points on this are heeded and clear. A lot of times flow maps are not available -- and I wondered what would someone due if they didn't have a flow map or the correct flow map ??? After reading your posts and reading about turbo efficiency ****************it seemed to me that EGT's would indicate when the turbo was ineffecient ....but you bring up a good point about a turbo over spooling / spining - According to the honeywell site turbo tech 103 ? The Choke Line is the right hand boundary of the compressor map. For Garrett maps, the choke line is typically defined by the point where the efficiency drops below 58%. In addition to the rapid drop of compressor efficiency past this point, the turbo speed will also be approaching or exceeding the allowable limit. If your actual or predicted operation is beyond this limit, a larger compressor is necessary. ? Turbo Speed Lines are lines of constant turbo speed. Turbo speed for points between these lines can be estimated by interpolation. As turbo speed increases, the pressure ratio increases and/or mass flow increases. As indicated above in the choke line description, the turbo speed lines are very close together at the far right edge of the map. Once a compressor is operating past the choke limit, turbo speed increases very quickly and a turbo over-speed condition is very likely. ? Efficiency Islands are concentric regions on the maps that represent the compressor efficiency at any point on the map. The smallest island near the center of the map is the highest or peak efficiency island. As the rings move out from there, the efficiency drops by the indicated amount until the surge and choke limits are reached. If I am reading this correctly, the turbo will overspin / overspool when the choke limit is reached .. which I think means the EGT will raise due to lower efficiency ??? Is this correct thinking ? Thank you once again for taking the time to share your thoughts .. its conversations like these that bring everyone up to speed...
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" .. going back and forth with you on a stupid point is like watching a retarded kid double dribble in basketball, you get tired of calling foul all day" ... Slowninja(GT28RS Inconel Z) on October 03, 2005 at 8:43 AM "the only chips you know about are Doritos. =)" ...ZEngineer on June 11, 2005 at 4:23 PM "....These posts only serve to make you look even worse, its gotten so bad it even makes me look bad to reply to you...." maglito on January 22, 2005 at 3:11 AM "What, are you afraid that only a couple of good ones have rolled off the production lines and the rest are crap?? ... Its mechanics not the stockmarket." ... ZisLuv on May 03, 2004 at 6:12 PM Z32 Power.Com Dyno Z Post 1 Z Post 2 My Project Z View Me! |
