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Old 04-28-2011, 01:28 AM Rookie

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Hot Damn 300 and EGT

Ok guys, please pardon the newbie questions.

Truck: 2008 6.4L Lariat automatic, 75,000 miles
Mods so far: DPF delete + H&S "mild" tune + S&B Cold Air Intake Kit

My wife wants to pull a fully loaded 6-horse trailer (14,000 lbs) over the mountains and wants me to install the H&S HD-300 tune. I'd like oblige her. I'd also like to avoid cooking the engine or tranny. So I'm sure at a minimum I need to put in a monitor to show the EGT. Of course the easiest and cheapest would be to get one that plugs into the OBDII port (EDGE-CTS, etc). However I also see lots of EGT kits (monitor + sensor) for sale on various websites.


1) Is the built-in Ford EGT accurate enough to avoid cooking the engine?

2) What EGT reading should she stay below when hauling this heavy load?

3) Why would you buy and install an EGT kit when the truck comes with an EGT?

4) Do I need to do a CAT-delete to get the performance boost from the HD-300 tune? Any problems continuing to leave the CAT in?

3) Any other mods you recommend for a heavy-towing application like this?

With thanks in advance,

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Old 04-28-2011, 02:44 AM
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With the DPF deleted, your Cat will collect soot. The hotter tune you run= more fuel burnt= higher EGT and more soot. I would delete that CAt if you wanna run the 300 tune especially if you are gonna tow.
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Old 04-28-2011, 10:45 AM
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I would remove the cat and the DPF (there really isnt any point to keeping the cat in unless your trying to keep it quiet in which case a muffler would do a better job), the factory EGT sensor is about as accurate as it gets..reads just a little lower then my analog autometer pyro. I would not use a 300 tune to tow through the mountains..even though some people do it just fine its just asking for trouble. The edge or lower H&S tunes would be a good bet. Avoid anything above 1350 especially for extended periods, these engines have proven themselves to be able to handle high EGT's really well but that doesnt mean they can be abused.

Last edited by KTMotoRider1; 04-28-2011 at 10:53 AM.
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