ManwithSupra Posted July 5, 2011 Share Posted July 5, 2011 (edited) Hi All, Just wondering if its ok to put the AFR sensor in the 1st downpipe from the turbos? If so where is best on the downpipe. I was thinking here? Rich Edited July 5, 2011 by ManwithSupra (see edit history) Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted July 5, 2011 Author Share Posted July 5, 2011 Added a pic Quote Link to comment Share on other sites More sharing options...
Hellstrom Posted July 5, 2011 Share Posted July 5, 2011 the closer to turbo the better. and less chance of getting messed up results due to small leaks. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 6, 2011 Share Posted July 6, 2011 You should have no problems with the proposed situation, they do advise not to put the sensor where it gets too much heat, however i ran mine in the same position with no problems, and i have seen plenty of people running them right next to the turbo outlet also without a problem. Quote Link to comment Share on other sites More sharing options...
hodge Posted July 6, 2011 Share Posted July 6, 2011 I've put mine in the midpipe. It's cooler and much easier to remove the midpipe than downpipe on stock twins. Quote Link to comment Share on other sites More sharing options...
scotty71 Posted July 6, 2011 Share Posted July 6, 2011 drill away and weld ya bung Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 6, 2011 Share Posted July 6, 2011 It should point downwards by about 30 degrees or so, that way condensation can't run into, and sit in the sensor. Check for clearance before drilling and welding! Quote Link to comment Share on other sites More sharing options...
Pixelfill Posted July 6, 2011 Share Posted July 6, 2011 the closer to turbo the better. and less chance of getting messed up results due to small leaks. I thought that was for EGT sensors. The AFR should be further away, I believe the manual suggests a distance. That said mine has been in the first decat for years and had no issues. Mike Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 6, 2011 Share Posted July 6, 2011 Nissan runs the O2 sensors right by the outlets of the two turbos and I have run Bosch LSU and NTK sensors in the same location for many hours of track usage with no issues at all. They light up faster and maybe even respond a bit faster up there. Should be no issue at all in the first de cat pipe. The two small adaptors in the turbo manifolds themselves are for Inconel EGT probes, pre the turbos. Quote Link to comment Share on other sites More sharing options...
Hellstrom Posted July 6, 2011 Share Posted July 6, 2011 if you have an air leak, that will mess with the sensor and mess up whole MAP. they whould withstand over 1200 celsius anyway. EGT can be put anywhere. it depends what you want to messure tho. have 1 EGT/cylinder is nice when mapping. or in the collector. but thats just when tuning tho since you dont want to risk having a bad senor in the turbo I thought that was for EGT sensors. The AFR should be further away, I believe the manual suggests a distance. That said mine has been in the first decat for years and had no issues. Mike Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 7, 2011 Share Posted July 7, 2011 if you have an air leak, that will mess with the sensor and mess up whole MAP. they whould withstand over 1200 celsius anyway. EGT can be put anywhere. it depends what you want to messure tho. have 1 EGT/cylinder is nice when mapping. or in the collector. but thats just when tuning tho since you dont want to risk having a bad senor in the turbo That applies to narrow and wide-band alike, but its seldom a real problem, however only where lambda feedback is being used anyway, IE closed loop, so won't effect on boost areas, and in any case i decent mapper would map closed loop anyway. Be interested to know where you have seen 1200c quoted for Bosch and NTK sensors, last time i looked it was 500c, however i agree that they seem to cope with far higher temps. Quote Link to comment Share on other sites More sharing options...
Hellstrom Posted July 7, 2011 Share Posted July 7, 2011 yeah sorry ofc its only working in CL, but it could do some serious dmg right there. to much gasoline, cylinder wash etc. the lambda should not have more heat then around 500-700c thats outside the sond itself. inside the exhaust sytem they withstand alot more then 500c. dont think it even starts to work before 500c That applies to narrow and wide-band alike, but its seldom a real problem, however only where lambda feedback is being used anyway, IE closed loop, so won't effect on boost areas, and in any case i decent mapper would map closed loop anyway. Be interested to know where you have seen 1200c quoted for Bosch and NTK sensors, last time i looked it was 500c, however i agree that they seem to cope with far higher temps. Quote Link to comment Share on other sites More sharing options...
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