After market computer chips
lb_burban
12-29-2004, 01:10 AM
I am getting around 15 mpg in my 5.7 '99 suburban. I am interested in hearing about computer chips which would increase the mpg. Has anyone seen a good setup which can be switched from economy to performance at the dash? I may need the power at times to pull a trailer. :confused:
Larry Derouin
12-29-2004, 09:16 AM
I am getting around 15 mpg in my 5.7 '99 suburban. I am interested in hearing about computer chips which would increase the mpg. Has anyone seen a good setup which can be switched from economy to performance at the dash? I may need the power at times to pull a trailer. :confused:
GOOD MILEAGE and SUBURBAN are mutually exclusive terms.
I will say I wish I got 15 with my 99, however 14.5 is close enough for government work.
You got a few things working against you with regard to getting better mileage.
1.) Drag co-efficient of a large brick.
2.) 5-6000 lbs being pulled by a small block.
3.) gearing that is more at home towing 5-6000 lbs at 40-50 mph than cruising at 70-75mph
Most chips I've seen increase HP at rpm ranges that would have your hair standing on end(Ilove my burb but there is something to be said about a big INLINE 6 with 250ft/lb of torque at 1200 rpm and minimal use of throttle to get underway) . And use of High Test Fuel to boot.
Do the usual tune-up. Switch to Synthetics in the engine oil, transmission, transfer case, and diff's. Just doing the switch to Synthetics MIGHT get you 1-2 mpg, a lot less rolling friction. Your change frequency will extend so it'll even out in the end. Stick an egg under your foot on the GO PEDAL.
Larry
GOOD MILEAGE and SUBURBAN are mutually exclusive terms.
I will say I wish I got 15 with my 99, however 14.5 is close enough for government work.
You got a few things working against you with regard to getting better mileage.
1.) Drag co-efficient of a large brick.
2.) 5-6000 lbs being pulled by a small block.
3.) gearing that is more at home towing 5-6000 lbs at 40-50 mph than cruising at 70-75mph
Most chips I've seen increase HP at rpm ranges that would have your hair standing on end(Ilove my burb but there is something to be said about a big INLINE 6 with 250ft/lb of torque at 1200 rpm and minimal use of throttle to get underway) . And use of High Test Fuel to boot.
Do the usual tune-up. Switch to Synthetics in the engine oil, transmission, transfer case, and diff's. Just doing the switch to Synthetics MIGHT get you 1-2 mpg, a lot less rolling friction. Your change frequency will extend so it'll even out in the end. Stick an egg under your foot on the GO PEDAL.
Larry
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