Why not tune AFR based upon EGT (Exhaust Gas Temperature)?
You can only get a general idea of AFR based upon EGT IF, and only if, you have correlated your car’s AFR with its EGT under a given set of conditions. And even at that, you can only get a general idea of the AFR. You can not tell with accuracy just where the AFR is. Perhaps at best you can get within a full point or so, and that’s not very close. Here’s an example of the variation in EGTs from car to car. Several months ago I helped tune 3 single turbo Supras on the same day on the same dyno using the highly regarded Horiba wideband O2 system. All 3 cars were tuned to about 11.4:1 AFR across the boost and RPM range. Peak EGTs ranged from 770 to about 880 C on the various cars according to the GReddy gauges (one car’s EGT at 770, one at 790, and one at 880). All 3 had GReddy EGT gauges but with identical probes mounted in different places. The coolest EGT reading was from a probe mounted in the #6 runner, the middle temp one was mounted in the front passenger corner of the collector, a
Related Questions
- Can I still add an EGT (Exhaust Gas Temperature) meter to my system if I did not purchase one initially with my Hyperflo System?
- Gas turbines heat the air and have high temperature exhaust – how will this be managed safely?
- What is the maximum safe EGT (exhaust gas temperature) I should want to keep below?
