Maybe that is the major difference...I am 4x4 on 20" wheels with ATs which contributes to the lousy mileage I suppose.
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
- Start date
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Ok toady's mission in this 90* humid ass swamp ass shit show is doing preventative maintenance and replacing the heater core tee's. Damn good thing I am, the outer straight connector nipple completely crumbled to dust in my hands. DAMN lucky on that one that it didn't happen on the road!!! Got brand new AC Delco replacements going in.
iamdub
Full Access Member
Drag is your biggest hindrance. Mine's 2WD (less weight), lowered and on stock-size street tires on lighter-weight wheels. The engine's also modded and tuned accordingly. All the engine mods were selected to work together. The higher compression increases power/torque. The tighter quench promotes more complete burn (efficiency) and reduces chance of detonation which allows for higher compression and more aggressive timing. The cam increases efficiency (read: power) notably at cruising RPM, reducing engine load at that RPM. Because of the improved power at the cruising RPM, I can get the same MPG at 72 as I do at 65 despite the higher RPM and increased wind resistance. Of course, it starts dropping considerably after 75 and 80 MPH- something like 1 MPG for every 2 MPH increase. The semi-tuned exhaust reduces pumping losses but maintains scavenging. The 3.xx"/4.xx" drop while maintaining a rake (although slightly reduced from stock) greatly improves aerodynamics. The removed roof rack helps a little. Removed third row seats so that's probably 100 lbs of weight reduction. This is also with a 3.73 axle gear.
Ok, here is a good example why taking pictures and studying them pays off instead of rushing the new parts on!!!
Just drive mine about 1000 miles almost all highway and all I ever get is about 11
Is it supposed to be black on the outside and white on the inside?
I was going to make a silly remark about always being pink on the inside but decided not to. Sort of.
You’ll notice that there is a slight difference in diameter of one of the pipes so they’ll only fit either the inlet or the outlet of the heater core. On mine, it’s black on the outside and white on the inside.
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gooffeyguy
Tom
Not sure off the top of my head which one is which, but they do have a different angle for the small rear line to connect to.
On my '04 the white tee is closer to the engine, and the black tee on the passenger side.
Is that black o-ring (or what is that) supposed to be on the passenger side heater core fitting?
Is that black o-ring (or what is that) supposed to be on the passenger side heater core fitting?
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gooffeyguy
Tom
I don't think all the pieces are off of them in that pic. Looks like parts of the inner clips still on the core pipes
