When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have an '04 PSD. I installed a turbo saver a while ago. It works great. I also recently installed a quadzilla commander monitor. I can finally see what my EGT's are on the road and at shut down. My question is this:
What is a good rule of thumb temperature when turning off the truck?
The turbo saver allows me to run the vehicle with the key out of the ignition up to 15 min. WAY TOO LONG in my opinion. I normally run it for @ least a minute or three depending on if I just got done towing a long grade or blah blah blah. Anyway, it seems that as soon as you let it idle, EGT's come down to the 400 and below mark pretty quick.
There are many threads on this and some as of lately. If you do a search you will find a lot of information on this. I turn my truck off at 400. It only takes a few seconds (maybe around 30) to get down to this. Waiting to get any cooler than that is just wasting fuel and very expensive fuel at that.
I agree with navypowerstroker, I load test diesels for 4 hours non stop, Sometimes the exh manifold is cherry red for the 4 hours, as soon as the load is dumped, the exh temps fall rappidly, Letting a truck idle for more than 1-2 mins is a wast of fuel. it does absolutly nothing.
Ford recommends idleing for 7-10 minutes after extended high speed/max GVW operation in order to allow the engine to cool down, particularly the turbo bearings. Just because the EGT has cooled, it is at this point that the engine/ bearings BEGIN to cool down.
This point may be moot because it seems likely that turbos may be replaced often enough for other reasons than bearing failure.