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Showing results for tags 'rb25 neo pyrometer temperature ping'.
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<Cool Story Hansel> Of the 3 cheapy Pro-Sport gauges I have in my car, one is an exhaust pyrometer. Probe is installed in a hole drilled in the exhaust housing. I installed it years ago, and it has provided interesting information since. But this week it paid back the purchase price and installation effort several fold. The other day I booted the car out of a corner and at decent load&revs in 2nd gear the gauge went over the ~950°C alarm temperature I'd set and flashed red. I went along fairly gently after that, but noticed that the exhaust temperature would climb a lot faster under any moderate load than it normally would. So, theories started to multiply in my head. Dead injector? Soft fuel pump? Thermocouple sheath finally burnt off an thermocouple junction exposed to full exhaust flow? Had a look under the bonnet and the FPR sense hose was connected and there were no problems with the AFM hose clamps etc. Thought I'd add the idea of a dying AFM to the list of theories. Fuel pump seemed like the obvious one, seeing as it is a Bosch 040 that has been in the car for a loooooong time. Slapped the car on the dyno just now. Mixtures were perfect. Well not perfect, but they certainly were not lean. Under any real load it was better than 12:1. Ran it up harder and under decent load it was pinging its tits off. Quite nasty. Had some fairly aggressive timing in a couple of areas of the map, but it didn't used to ping there. So we pulled some timing out and silenced the pinging. There does not seem to be anything else wrong with it. Right at the top of the revs/load it is as rich as buggery - some power to be found there later, but we'll deal with that another time. Result? Can only really be a bad batch of fuel. I filled the tank on Saturday at a different outlet to my usual 1 or 2 places. Suffered the high exhaust temps on, maybe, Wednesday. All the driving between filling up and that time was commuting to work and back in horror traffic so no opportunities to load up and get any warning. Too coincidental to be a coincidence, for my liking anyway. Anyway, the pinging was bad enough that if I had continued on blithely thrashing it (if the opportunity presented itself) with the stereo turned up I never would have heard anything and it could have cost me the engine. I'm happy. </CSH>
