Join Date: Jul 2011
Location: McDonough, GA
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Recently bought a used '99 F20 CC 4x4 showing 410,000 on the clock. Fixed a few leaks here and there, PS and water pump, HPOP & fuel bowl O rings - nothing major.
Installed a 14" cone filter onto the stock intake boot and removed the factory air cover along with a 4" turbo back exhaust system. I have a TS 6 position chip - stock, high idle, 50, 75, 100 and 140 and I average 15 MPG with 50/50 highway (70-75 mph) and stop and go traffic.
Installed trans temp, boost and pyrometer gauges yesterday and on the stock tune setting I'm seeing 10 to maybe 12 psi of boost (teed into the MAP line) and a max of 16 psi on the 100 and 140 hp settings. At that boost level I saw EGT just touching 1500 which seems a bit high to me for that amount of boost.
Re-checked all the boot connections under hood, nothing loose or blown off. Pulled the intake off the turbo and found that the intake wheel side of the shaft has a good bit of radial play, axial play seems very slight but I didn't try to setup a dail caliper to see what it was. Looking at the vanes on the compressor wheel it appears that they have been contacting the housing, haven't looked at the exhaust side but I did make sure the up pipe clamp was torqued also.
Having said all that, I've read that stock boost should be in the 17 psi range and tuned should see 24-26+ psi so it appears that a new turbo is needed. I got the truck to DD and on occasion pull my F150 race truck to the track and I'm not looking to break the bank on a turbo - thinking a new or reman stock unit. Question is where to get one from that is reputable and will balance the shaft during assembly so that it will last.
I am already satisfied with how the truck runs and pulls and I'm not going to change to oversize injectors, bigger HPOP or any other extremes to gain more power. I have not removed and tried to clean the intercooler either, just don't think it's clogged.
Long first post I know but all help is appreciated.