Forced Induction Superchargers | Turbochargers | Intercoolers

130 miles from one tank

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Old Oct 11, 2009 | 07:14 PM
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Default 130 miles from one tank

is this normal ? i really do not mind paying for gas as long as my car is happy.
car does not run rich at all checked all the plugs and they are looking good.

i have 42lb injectors and a racetronix pump with hotwire kit, the fuel pressure is in the 60psi zone at idle

the motor is a 8.6:1 cr 347 running 10 psi of boost, sometimes spiking to 13. 94 octane and no meth
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Old Oct 11, 2009 | 08:04 PM
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Is this mostly WOT run's? It should be able to get much better gas mileage then that just cruising.
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Old Oct 11, 2009 | 08:19 PM
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no mostly driving to work and back lol, car not running rich at all
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Old Oct 11, 2009 | 08:22 PM
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Originally Posted by elias_799
no mostly driving to work and back lol, car not running rich at all
If it is just daily driving then it could definately be better. Maybe the car could take more timing? What tranny? No fuel leaks? Wideband in the car?
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Old Oct 11, 2009 | 08:22 PM
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same here, about 13mpg around town. On the highway it goes over 20.
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Old Oct 11, 2009 | 08:27 PM
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Originally Posted by black98ws6ta
If it is just daily driving then it could definately be better. Maybe the car could take more timing? What tranny? No fuel leaks? Wideband in the car?
tranny is a stock 4l60e

no fuel leaks

and unfortunately no wideband
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Old Oct 11, 2009 | 08:28 PM
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I get close to 200 miles to a tank.....with plenty of 15psi pulls
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Old Oct 11, 2009 | 08:30 PM
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Originally Posted by elias_799
tranny is a stock 4l60e

no fuel leaks

and unfortunately no wideband
Stock converter?

There has to be room for improvement in the tune or you have a mechanical problem resulting in low mpg.
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Old Oct 11, 2009 | 08:45 PM
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stock converter
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Old Oct 11, 2009 | 08:51 PM
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transmission and deferential oil is very clean, i do not see where i can have a mechanical problem. better not be the motor, it only has 4000miles on it. oil that comes out of that is clean also
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Old Oct 11, 2009 | 09:13 PM
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I get around 140 to a tank filling it at 1/4 tank level. That is 98% short trips around town.
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Old Oct 11, 2009 | 09:22 PM
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^^^ i fill mine when the check gauges light comes on
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Old Oct 11, 2009 | 09:47 PM
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I thought it was bad to run a aftermarket pump below a 1/4 tank of gas?

Could be burning the pump out faster than normal.
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Old Oct 11, 2009 | 11:14 PM
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i am pretty sure my tank is clean, and the gas i get is clean, so i do not think i am burning my pump
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Old Oct 12, 2009 | 12:22 AM
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do you let the car sit and warm up as of a morning, i do and i will go into town and back and i get like 150 to a tank, if i dont let if warm up much i can usally go about 200
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Old Oct 12, 2009 | 12:40 AM
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my tahoe only gets 220ish and its mosty stock i cant imagine what a 408 would do
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Old Oct 12, 2009 | 01:02 AM
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your dumb if you have turbo with no wideband sorry. My car is N/A and i have one. I bet its rich! A wideband will tell ya what ya need to no I got 110 miles to 1/4 tank this weekend on hwy
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Old Oct 12, 2009 | 01:06 AM
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Originally Posted by BadgeZ28
I get around 140 to a tank filling it at 1/4 tank level. That is 98% short trips around town.
that were im at also
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Old Oct 12, 2009 | 09:49 AM
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Originally Posted by SIC LSX
your dumb if you have turbo with no wideband sorry. My car is N/A and i have one. I bet its rich! A wideband will tell ya what ya need to no I got 110 miles to 1/4 tank this weekend on hwy
i do not need a wide band to tell me if my car is running rich, i just occasionally check the spark plugs after a wot run. but thanks for being an *******.
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Old Oct 12, 2009 | 09:53 AM
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Originally Posted by uphigh07
do you let the car sit and warm up as of a morning, i do and i will go into town and back and i get like 150 to a tank, if i dont let if warm up much i can usally go about 200
yea, i let it warm up to 160 degrees, thats when my thermostat opens and the fans kick on. i kind of have to let it warm up because of the valve springs i have in the motor. they need to be heat soaked before you do any hard driving. otherwise there is a good chance of them breaking.

again i do not mind paying for gas, as long as it is normal.
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