Join Date: Aug 2010
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Hey guys I have an early 99 with a 6637 intake and 4 to 5 inch straight piped exhaust. I only get about 12 miles per gallon and have tried a lot of the "common fixes" such as the EBPS and tube as well as additives, filters, a new set of injectors keeping it under 1900 rpms or so and anything else I could try. I also tightened all my boots at least I thought I did, but now I'm reading people saying while cruising at 65-70 they are getting 5-7 lbs... I started watching mine and got these numbers...
56 mph and 1500rpm 2psi
67 mph and 1750rpm 0psi
73 mph and 1900rpm 1-2psi
77 mph and 2000rpm 3-4psi
they are readings once I get up to speed and have my foot in the throttle just enough to cruise at that speed...
being that my truck has the smaller early 99 turbo would it make less boost or should I investigate further into boost leaks being the cause of my bad mileage...?
Thanks in advance
Early 99' CCLB, 05 Harley Front End, 05 Harley Black Leather Interior, 05 Lighted Tow Mirrors, Built Trans
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