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Gearheads
An interesting upgrade for some older vehicles.
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<blockquote data-quote="swampratt" data-source="post: 3081396" data-attributes="member: 15054"><p>Those alternators do not pull much power if the accessories are off and batteries are fully charged.</p><p></p><p>I ran a 2000 continuous watt inverter and a window unit in my van with a TV going and front ac on heading down the highway in arizona and still pulled MPG in the 17's and one stretch got 19+ MPG No overdrive and 350 gears.</p><p>that was my 84 ford van 6000 lbs empty.</p><p></p><p>Mobil synthetic wheel grease mobil synthetic trans and differential fluid and Mobil synthetic oil at that time.</p><p>Later changed to T6 rotella.</p><p></p><p>Here is an eye opener.. I had a spare tire mounted to the front bumber on a cattle pusher rack.</p><p>When i removed the spare tire the MPG dropped 2 MPG..I **** you not the tire helped aero drag on the front of that brick.</p><p></p><p>No vacuum advance 18 initial timing and 35 total on that Ford 302.</p><p> 3" single exhaust through a 3" turbo muffler.</p><p> Air pressure in the tires needs to be checked and maxed out.</p><p>My corolla will drop 5 MPG from 44 psi to 35 psi.</p><p></p><p>All those little things add up.</p><p>Not all synthetic oil is the same when it comes to MPG. I tested many.. but today i have not found a decent one they keep changing them on me.</p><p>I was running T6 up until a few months ago.</p><p></p><p>What engine and fuel system in the Tahoe..Is it carbed??</p><p></p><p>MoBoost runs a dyno tune shop and has asked me a couple times if i tuned my stuff with a wide band..Nope.</p><p>Tune the old fashioned way.</p><p>Jet down primaries until you get a lean surge at part throttle cruise. then jet up .001" at a time until it is gone then come up .001" to .002" more to be really safe and this puts part throttle cruise in the 14.5 area.</p><p>Idle air fuel ratio on these older factory carbs usually falls in the 15-18 area.</p><p>Idle AFR can be pretty lean and not hurt a thing.. my van was high 18's and part throttle cruise in the 15 area.</p><p></p><p>Very lean but long small runners in the 2 barrel intake and all the added timing made it work.</p><p>If you run lean you add timing to help it out.</p><p></p><p>So what do you have and have you put a timing light on it?</p><p>Thought about a spare on the front???</p></blockquote><p></p>
[QUOTE="swampratt, post: 3081396, member: 15054"] Those alternators do not pull much power if the accessories are off and batteries are fully charged. I ran a 2000 continuous watt inverter and a window unit in my van with a TV going and front ac on heading down the highway in arizona and still pulled MPG in the 17's and one stretch got 19+ MPG No overdrive and 350 gears. that was my 84 ford van 6000 lbs empty. Mobil synthetic wheel grease mobil synthetic trans and differential fluid and Mobil synthetic oil at that time. Later changed to T6 rotella. Here is an eye opener.. I had a spare tire mounted to the front bumber on a cattle pusher rack. When i removed the spare tire the MPG dropped 2 MPG..I **** you not the tire helped aero drag on the front of that brick. No vacuum advance 18 initial timing and 35 total on that Ford 302. 3" single exhaust through a 3" turbo muffler. Air pressure in the tires needs to be checked and maxed out. My corolla will drop 5 MPG from 44 psi to 35 psi. All those little things add up. Not all synthetic oil is the same when it comes to MPG. I tested many.. but today i have not found a decent one they keep changing them on me. I was running T6 up until a few months ago. What engine and fuel system in the Tahoe..Is it carbed?? MoBoost runs a dyno tune shop and has asked me a couple times if i tuned my stuff with a wide band..Nope. Tune the old fashioned way. Jet down primaries until you get a lean surge at part throttle cruise. then jet up .001" at a time until it is gone then come up .001" to .002" more to be really safe and this puts part throttle cruise in the 14.5 area. Idle air fuel ratio on these older factory carbs usually falls in the 15-18 area. Idle AFR can be pretty lean and not hurt a thing.. my van was high 18's and part throttle cruise in the 15 area. Very lean but long small runners in the 2 barrel intake and all the added timing made it work. If you run lean you add timing to help it out. So what do you have and have you put a timing light on it? Thought about a spare on the front??? [/QUOTE]
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