HRSPOWR
05-09-2013, 13:47
I have a 77 Scout that I swapped in a 6.2 700r4 setup out of an 84 Suburban.
3.55 gears, 33" tires. Rig weighs about 5000 lbs.
Runs GREAT, pleanty of power, lots of fun to drive, but I expected a little better mileage. Driving carefully, no stomping gas, etc, I get 10-11mpg.
Previous suburban owner had a Goodwrench engine installed approx, 70k ago. He also added an ATS turbo system.
During the conversion I beefed up the 700r4, turned up the pump about an 1/8th of a turn, I get no black smoke... Ever.
My pump advance is about a 1/8" past the factory mark towards the driver side. My cold advance is on a switch, and when cruising, if I flip the switch (with fast idle disconnected) there is a noticable surge forward, and boost gauge jumps by 2-3 PSI. (My ATS doesn't run boost unless I really step on it, and maxes out about 5-6 pounds)
It runs really well with cold advance on, but has funny throttle response, seems to surge, and builds psi twice as fast as normal.
I don't have access to a timing setup for diesels, so am trying to figure out by seat of pants.
by how it runs with Cold advance on, I would think it needs more advance?
I bumped it another lines worth, isnt that much louder, still runs great, but still works tons better when I flip advance switch.
Im I fooling myself that I can get better then 15mpg with this combo?
Thanks for any help you can provide.
Dan
3.55 gears, 33" tires. Rig weighs about 5000 lbs.
Runs GREAT, pleanty of power, lots of fun to drive, but I expected a little better mileage. Driving carefully, no stomping gas, etc, I get 10-11mpg.
Previous suburban owner had a Goodwrench engine installed approx, 70k ago. He also added an ATS turbo system.
During the conversion I beefed up the 700r4, turned up the pump about an 1/8th of a turn, I get no black smoke... Ever.
My pump advance is about a 1/8" past the factory mark towards the driver side. My cold advance is on a switch, and when cruising, if I flip the switch (with fast idle disconnected) there is a noticable surge forward, and boost gauge jumps by 2-3 PSI. (My ATS doesn't run boost unless I really step on it, and maxes out about 5-6 pounds)
It runs really well with cold advance on, but has funny throttle response, seems to surge, and builds psi twice as fast as normal.
I don't have access to a timing setup for diesels, so am trying to figure out by seat of pants.
by how it runs with Cold advance on, I would think it needs more advance?
I bumped it another lines worth, isnt that much louder, still runs great, but still works tons better when I flip advance switch.
Im I fooling myself that I can get better then 15mpg with this combo?
Thanks for any help you can provide.
Dan