jacob80 Posted March 20, 2009 Share Posted March 20, 2009 Hey boys, read a thread about the bung on the MSA downpipe being too close to the turbo. Is this such a problem that we should have it relocated? We just wrapped the downpipe with thermo-tec heat wrap as well. Has anyone had any problems with their o2 sensor going bad because of this? Quote Link to comment Share on other sites More sharing options...
boardkid280z Posted March 20, 2009 Share Posted March 20, 2009 All the O2 sensor suppliers I have read about or heard from say you should keep the sensor at least 12" from the turbo. Any closer and the sensor can't control the temp properly inside the sensor and can/will give false readings, or go bad. The sensor temp has to be within a certain range, 700-800deg or something, and as we all know, exhaust temps can range from 1000 to 1500 deg, which is well beyond the designed operating range of the sensors. (Also, why did you post this in ignition/electrical, mods - move plz ) Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 20, 2009 Author Share Posted March 20, 2009 I posted it here because the 02 SENSOR is an electrical component. Why would MSA place the bung so close then? Quote Link to comment Share on other sites More sharing options...
BayAreaZT Posted March 20, 2009 Share Posted March 20, 2009 I have a stainless DP with the O2 bung about 3-4 inches from the turbo. I ran my LM-1 on it for months without the sensor going bad. Can't say if it threw the accuracy off because I never compared it on a dyno. I'm in the process of having another bung welded further downstream because it is better but I think you can get by running it closer to the turbo with the recommended heatsink. I ran mine without the heatsink. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 20, 2009 Author Share Posted March 20, 2009 Where can I get this heat sink Quote Link to comment Share on other sites More sharing options...
BayAreaZT Posted March 20, 2009 Share Posted March 20, 2009 Take a look at the LM-1 manual. It gives you info on how to make one out of a copper sheet. Quote Link to comment Share on other sites More sharing options...
hughdogz Posted March 20, 2009 Share Posted March 20, 2009 Or you can buy their O2 bung extender, but I agree the copper sheet is probably the way to go. http://www.innovatemotorsports.com/xcart/product.php?productid=16148&cat=250&page=1 If the sensor is outside the operating temperature range, an error reading will result instead of giving the incorrect AFR. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 21, 2009 Author Share Posted March 21, 2009 Is MSA really THIS uneducated about this stuff? I figured they've been in the biz for a while Quote Link to comment Share on other sites More sharing options...
slown280z Posted March 21, 2009 Share Posted March 21, 2009 I think they're catering to the "bolt on" guys instead. The O2 sensor on the stock EFI is unheated and I believe needs to be closer to the turbo. WBO2s can be anywhere in the exhaust stream before a cat or an exhaust leak and still provide good measurement. That said, I've been running an LC-1 on the stock DP with no issues what so ever for over a year. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 22, 2009 Author Share Posted March 22, 2009 Well in that case if I throw the copper heat sink on there shouldn't be any issues, except for the fact our downpipe is wrapped. Would this be a big factor? Quote Link to comment Share on other sites More sharing options...
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