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Well theory #2 went down in flames, same-same runs up to 200, fan comes on and it just sits there at 200, not getting any hotter but the fan runs continuously which is not doing my mileage any good even at 22-2300 RPM, at least it is not screaming like a banshee going down the road at 70-75...

OK,,, so I took a piece of 1" dowel and drilled a 5/16" hole in it and shoved it in the bypass hose, this should have some effect if my 2nd theory is correct. I have to go to Beeville tomorrow, nice little 40 mile round trip, should yield some data...

I have not heard anyone else having issues with the aluminum radiator but none are on turbo Detroits that I know of, and it is 95 today.

The aluminum radiator does great with the Duramax, of course it closes the bypass so all the water must pass through the radiator. I may look at restricting the bypass on the GEP to see if that helps

Problem: fan runs all the time on the highway. Theory: the thermostat is controlling the temp high enough to keep the fan running all the time. So I ordered a 180 deg thermostat and yesterday is was on the truck for delivery so I drained some coolant, removed the original thermostat and had...

I cranked mine up a little more, running 11-12 psi max and around 10psi cruising, will have to check on the pump, I am getting my butt handed to me right now by my JD 350 dozer....

OH HELL YEAH!!! BIG difference, boost went to a solid 10 PSI with the above setting, EGTs came down about 75 degrees and it takes less throttle at speed, It has to be getting better fuel mileage and the GEP seems much happier all around. I may try for 12 PSI but I see no reason to turn the...

The pictures of the Wicked Wheel and the billet wheel I got from KBD look exactly the same, I suspect there is one manufacturer of the billet wheels and everyone puts their brand on it. So I should get similar results.. EDIT, I think you are right on, on the 10 PSI, I will be happy with 10-12 PSI

Well that was REALLY easy, just grind off the crimp in the middle of the "can" until it gives up the "cover", then carefully grind the end of the rod (spring end) until the spring cap is free. Then thread the rod with a 10-24 die and drill the spring cap to slide over the rod and presto...

I canceled the boost controller, I talked to KBD and they said they did not have them cuz it was just too easy to mod a stock one..

I guess I should have just kept the 6.2L and put on a BMI kit, not sure what the kit cost, I only paid $1500 for the 2007 GEP turbo with 100 miles on it, I did have to build a turbo for it. Is your M998 a A0 or A1 with the 2.56 gears? I am seeing 2200@75 with the 6L80, it has a somewhat lower...

I bought one from Quick Tricks, KDB does not have one.

Found it! Boy that really did bring down the EGTs also!!

Do you have a link???

I put a boost gauge on it and am rather disappointed with what I am seeing, but also a little confused at what I am seeing. I am running around 7psi at 75mph and 2200 rpm, if I lift my foot and then get back into it it will jump to 10psi for just a second then drops back to 7 psi. Another...

I would be interested to see how fast it reacts, your numbers are very low, when you are running at highway speeds and lift off the throttle it should drop very fast to around 300 degrees otherwise it is being influenced by the manifold (tip of probe not in the middle of the stream or cheap...

I did get the Pyro installed today and went for a test drive, the gauge sat at 900 at highway speeds, this is lower than the DuraVee would have registered, it would have been around 1000 deg. This is all much lower than what you are seeing, but I am doing 75 not 55

Wellllllll, maybe it had been a little longer than I thought on the hubs, the right front hub was way over full, looks like diesel/gear oil which would make sense because I recently replaced the mechanical pump with an electric because it was leaking around the seem where the top and bottom of...

I did not notice much change in the ride this morning, fan running nearly normal at 75 with a tail wind, running all the time pushing a 24MPH head wind at 70MPH, but I am also running in 6th where the 6.2L would be running in 5th so the fan would be pulling more air. BUT it looks like the joy...

OK, I may have found an issue, I noticed some moisture around the top of the coolant tank, so I got out the handy dandy coolant test kit and I'll be danged, every screw holding the brass neck to the top of the coolant tank was loose, after tightening them down it will now hold 15LB. This would...