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Discussion Starter #1
Well i have had the high idle in for 2 weeks now, works well, however I'm not seeing much of a difference in warm up time really, i have the attitude so i get LCD EGT temps and engine temps, basically on normal idle at cold startup (40 degrees outside) the truck is at about 240-250 degrees EGT ,when kicking on the high idle (1200 rpm) it goes up to 260-270 tops. What are others getting for temps??? seems like the additional 20 degrees of EGT does not really increase warm up time very much in my case, going to 1800 rpm high idle gets me about 280-285 on the EGT, surprisingly even at the 1200 rpm idle it shows about 2.6 psi of boost, the 1800 is about 3.4 psi!!! if my motor temp starts at 50ish degrees (off the attitude) in 40ish degree weather it takes about 8-10 minutes at 1200 rpm to get up to 100 degrees engine temp. Is this about what others are seeing?? Wish i had a plug in at work, it nice plugging in at home and starting the motor in the morning at 120 degrees!!!!!!!!!!
 

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On start up, I see around 185 to 195.... in your same temps. I have the SPA digital guage. I can get it up 15 to 20 deg by moving to 1200 rpm..... After it warms up I get a idle temp at 240 in 40 deg weather.....
 

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EGT's are the same as mine.


EGT's do not warm your cab. The running engine at higher rpm does heat up the coolant faster and if your heater is on, will heat up your cab faster than at an idle.


With no load on the engine, EGT's will always be very cool no matter what the temp outside.
 

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Discussion Starter #4
IMO I beleive EGT temp is directly related to how fast the coolant warms up, higher EGT = higher cylinder temp which equals greater heat transfer to the coolant which warms the engine faster. I cant see how running it at a faster rpm would build heat faster if the EGT stays basically the same??? Honestly i thought when doing the high idle install i would see at least about a 50-75 degree increase in EGT which would help warm up some more???
 

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The problem is diesel engines today in general are so efficient they don't leave much heat after combustion... especially when there is no load.... even at slightly higher rpms. I've actually seen my temp drop after a few minutes idling 800.
The key is load... something you just don't have in park.Edited by: hoot
 

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Well the high idle warms my truck faster than at an idle. If I am up to temp (190) and its 15 degrees outside and I turn it up to 800 or 1200, I still see my temp drop also. But when the motor is dead cold, it warms up fast to at least get heat in the cab.
 

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Discussion Starter #7
I have noticed on my truck also that at full temp in 30 deg weather at idle regular that it will indeed drop temps also and go below 180. Your truck runs at 190 degrees? The highest i have seen my engine temp ever is 187 degrees, of course it has not been over 50 deg since i have had the attitude, but basically cruising down the interstate at 70mph or even around town it will run between 181 and 183 degrees all the time.


I'm also amazed at how much engine heat is lost when shutting the engine down in 50 degree weather, if i go to a restaurant to grab a burger or something maybe 10 minutes tops the truck is off and its already back down in the 160 degree range and takes a few miles to get back to 183.
 
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