Any ideas for improving airflow to the Volvo VNL engine compartment???

[Magard]

(08-25-2017 )JMBT Wrote:  Thanks guys for all the input.
Magard: that looks great, very custom! I think that would really help, especially on the pass side, but I would do both sides as well for the symmetry. What is an average flat ground cruising EGT for you, and does EGT come up fast when you are pulling on a grade?

Rawze: I like the idea of wrapping the exhaust. What kind of material do you wrap it with, also how much of the exhaust would one wrap?

Snailexpress: I am flat ground cruising at 62mph, 1450 RPMs, about 550-625 EGT, when I start up a grade heavy, she comes up fast. The manual engine fan helps tremendously, but I just thought if I could get some of the exhaust heat out of there it would be better all around. Coolant temp never seems to be a problem, just EGT's a bit high.

It is more of a custom tune thing that really changes egt. Uniliever tuned the truck and we played around with turbo position while cruising. If the turbo moves more air it runs cooler and is more responsive (quicker) but feels like it is working alittle harder (more back pressure). If the turbo moves less air it runs warmer and is slower. Truck feels less restricted running turbo position opener (less air) less back pressure but the trade off is allittle more heat. I'm running my position looser because I feel fuel mileage is better cruising this way. (Just a guess I don't have any numbers to go off of.) I didn't notice egt change when I cut the hood. My prob is in the exahaust stream. I was more after under hood temps. Trying to make the electronics live longer. Trying not to bake the wiring over time. Wrapping would definitely help. I was also trying to improve radiator air flow by giving the air a path to take out.