Originally Posted by
20/20 vision
how are these inlet temps being measured?
in a Cosworth how much impact does the positioning of the air temp sensor in different plenum designs have when these inlet temps are being measured?
my YB kit car has a stock plenum with 14mm spacer and stock location of stock air temp sensor. due to the resticted bonnet space, the plenum itself suffers lots of heat soak from the cylinder head or hot radiator air passing it on the way out.
under heavy use, inlet temps go to 40c max but on coasting after a thrash (so theres no air going into plenum to cool the sensor) it heat soaks from the plenum and inlet temps are reported up to 60c but as soon as the throttle is opened again (even slightly) they drop down to ambient + about 10c. however, the drop takes about 2 seconds or so and meanwhile the ecu is pulling timing.
i logged another temp sensor placed in the intercooler outlet hose and that's a much better solution.
do cossies have this heat soak issue?
I think you are doing what most people do and most people would suffer from some similar heat soak...although Mark Shead will be the authority on this thread to answer. I think I saw that Rod was measuring right at the point of entry and exit on the intercooler at one point which would be the best I guess.