trreed

185k kinda abused miles. Mostly towing more than it liked. Rings were very worn, and had minimal compression.

That particular Tahoe got an engine overhaul and managed 20 mpg on the interstate somehow. However, it sure didn't help the truck's mpg's at all sitting up there. That rig weighed in just under 19k.

160K. 15 mpg in traffic , 17-19 highway. 14 with the gooseneck.

Thanks for posting this @Dieselfuture! We have the same tire size and I've noticed the speed differences a lot being I usually run interstate speeds and I could never figure out if my speedo was off or the Quad was high at those speeds. As for your mpg findings, I see very similar things. I run around on my "speshul tune" (read: idiot race tune) most of the time, and 65-70 I read 18-19 mpg, 75-80 reads 15-16, and 85 reads 17-18. My engine load stays pretty constant through all those speeds as well, so I don't have any ideas why it's so different.

@TFaoro wants a race trok I think...

You didn't try to trade it in, did you...

@Marcus2000monster

Quadzilla 6.7 edition???

Napa, Advance Auto, O'Reilly's... any parts store, or if you've got a mechanic friend with a good reader you might be able to pay in beer.

http://atptrucks.com/blog/compound-turbos-and-boost-numbers-the-math/ I found this as I was trying to refresh my own memory just now. Pretty helpful and a better explanation than what I gave.

Total boost would be 30. But yes, 50/50. And it'll be as close as you can get it. For me, light throttle cruising I'm at 5 from the primary and 10 total. Moderate acceleration my secondary makes a few more psi than the primary. and WOT the two are split perfectly 50/50.

The wastegate is going to control how hard each turbo works. It also sees total pressure. So the earlier it opens, the more work the primary will do. ~32 is where mine seems to be happiest. Good rule of thumb one you get the interstage boost gauge in is to get each turbo to be doing half the work.

It sounds like your timing piston is out of whack.

Is that 14.2 hand calculated or 14.2 from the overhead lie-o-meter?

Everything about these trucks is weird

99 model trucks all had the HX35. The HY35 was only on 01-02 auto trucks.

Heavy.

That is a topic I know nothing about. Sorry.

Pressure drops because you're introducing air into the system. If the sound of the pump is consistent, pressure is steady, and it doesn't sound like its sucking air, its fine.

Post a video of the pump sound

I like it! I started looking over the engineering documents to satisfy my curiosity, and there’s plenty of mentions of twisted pairs being used. I’m going to double check with the engineer when I’m at the plant again, but I have a suspicion all wires in aforementioned cable are twisted pairs to alleviate the interference.

My thoughts now on it are if the circuits are that sensitive to voltage changes (I'm assuming it will be all sorts of limit switches, light sensors, and depth sensors, as this is a chute that sweeps from side to side, dispersing product evenly) then the coiled cable would affect those circuits in the same manner as an amplified lift pump motor. But, I am not an electrical engineer. I chose to go a generic mechanical engineer route with focus on equipment.

It shouldn't rise if it's already primed and there's no air bubble anywhere.

Sound sounds normal. You'll get used to it. When I hit the key, I liked that the pump was loud enough to hear in the cab when it cycled so I knew everything was still working.

@W-T - I certainly respect those who take the time to go above and beyond with their installs. I strive to be like that eventually as well, but unfortunately my redneck farmer side gets in the way sometimes. On the subject of the physical coil of wire, it seems over kill to me to be worried about inductance for 16 gauge wire carrying 13V DC, as I have run that exact harness and never had issues. Just two different views. Side note, I was watching a multi-million dollar dryer being installed in a new plant the other week. The control panel for the feeder has a cable of X feet long (length slips my mind), and a question came up between the engineer from Buhler and the installation supervisor about what to do with excess cable. The engineer recommended to not cut excess wire out and leave the original length of cable to avoid messing with anything in the control panel due to slightly less voltage drop across the shorter wire. He even went as far as to recommend that any excess cable be coiled up and placed in the control panel itself. This particular feeder runs on a 480V, 3Ph system, and after our discussion above, now the advice seems strange. I am looking forward to your write up on the bypass circuit for the pump motors. That is an aspect I've never considered before, nor did I know anything about the internals of a Carter pump. @Marcus2000monster, what kind of noise is it making? Just loud when running? Or is it a pulsating sound?