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04-29-2006, 10:40 AM
| #1 |
| Full Member Join Date: Aug 2005
Posts: 43
 |  gas mileage hello i need your help i have a 1989 chevy k1500 i have added a bed topper, tornado, K&N, hypertech powercharger, tbi spacer removed the stock baffels in the air intake, and had the motor bored .40 over i still get only 10/11 mpg what else can i do? ok i bored the motor before i added the other stuff but still my mileage sucks. im gonna have to trade for a toyota t100 if i cant get my mileage up please help! |
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04-29-2006, 11:07 AM
| #2 |
| Senior Member  Join Date: Jun 2005
Posts: 2,757
 | gotta 350? what sized tires?
__________________ 99 suburban xlt 96 silverado 91 wrangler (my baby  )08 Honday shadow 750 (my mistress  ) |
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04-29-2006, 02:18 PM
| #3 |
| Full Member Join Date: Aug 2005
Posts: 43
| chevy 350 bored .40 over 265/75/16 mudterrain ta's |
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04-29-2006, 04:50 PM
| #4 |
| Senior Member  Join Date: Sep 2005 Location: ALABAMA
Posts: 3,554
| T100 isnt great mileage either but probally a little better than what your getting. First throw the tonrado away, they are junk in my opinion. I would make sure the front differential actuator isnt stuck and pushing the front end when you drive. It cost me bad fuel mileage for a month or so until I figured it out.
__________________ Some people are like slinkies, Basically useless, But fun to watch when you push them down the stairs. |
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04-29-2006, 06:00 PM
| #6 |
| Full Member Join Date: Aug 2005
Posts: 43
| how can i tell if the front differential actuator is stuck? i have heard of useing acetone 3oz per 10gallons helping gas mileage from 5-20percent does it work? oh and by the way the oil pump blew and by the time my gauge showed no oil pressure i had scored the piston walls thats why i bored it out. |
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04-30-2006, 08:16 AM
| #7 |
| Senior Member Join Date: Jun 2005
Posts: 2,757
| you aint gonna get your gas mileage much better that that i dont believe..... just bc the 350, 40 over and them tires. i have a stock 350 on stock tires, and mine aint much better than what your gettin
__________________ 99 suburban xlt 96 silverado 91 wrangler (my baby )08 Honday shadow 750 (my mistress ) |
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05-01-2006, 04:59 AM
| #8 |
| Senior Moderator  Join Date: Feb 2006 Location: michigan
Posts: 7,132
| if you try ******* the front end up and spinning a front tire the other one shouldn't move. also if the actuater is engaged you may hear a slight whine from the front end. i had to replace one in my blazer. |
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05-02-2006, 09:50 AM
| #10 |
| Senior Member Join Date: Sep 2005 Location: ALABAMA
Posts: 3,554
| Acetone has been proven a hoax. Probally not good for the motor either. your motor is a 355 being bored .040 over and with larger tires it doesnt help. Dont think you are gonna do alot better with your current setup.
__________________ Some people are like slinkies, Basically useless, But fun to watch when you push them down the stairs. |
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