MIDNIGHT RIDER
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- Sep 29, 2005
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i have heard several mention that it definately helps cut through a head/cross wind. mileage gains might be smaller but it does something at least. that and look really cool! mels got one on his dually he tows with right?? maybe he can chime in. kinda surprised he hasnt yet since hes got a big camper he tows too. i was thinking about this today, do you guys think my boost is a bit low? i do. would that maybe be a cause to my egt's also? if i can get egt down then i can give more throttle. right now im just driving by the gauges which kinda sucks.
Where many miss the boat when talking about "boost" is the fact that the gauge reading is given in "BOOST PSI" meaning pounds-per-square-inch positive pressure, NOT VOLUME.
You can put 45-PSI in a bicycle tire; but, a 11-24.5 truck-tire with 5-PSI is gonna have enough air in it to inflate a whole host of bicycle tires.
You could have an obstructed intake system that still would show healthy boost numbers.
All that being said, when the 6.9-IDI was in my truck, Hypermax/Garrett turbo, boost-PSI at a no-load cruise was about 7-PSI; with the turbo really singing on a hard pull --- maybe 15-PSI.
Where is your pyrometer probe ??
Is it a mechanical or electronic pyrometer; meaning, does the key-switch need be on for it to read ??
Higher boost will to some extent lower EGTs, but it can also increase them.
What happens to a torch when you pull the Oxygen trigger ??
Does increased RPM lower your EGT reading ??
Unless your pump fueling is drastically turned up, I don't really see it having such high EGTs.
What kind of air intake ?? air-filter ?? clean and un-obstructed ??