Better MPG??
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Better MPG?? - 1/5/2007 7:15:31 PM
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Chevyguy032
Posts: 170
Joined: 10/21/2006
Status: offline
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Ok I was looking into getting a cold air intake and a throttle body spacer for my vechicle..I was reading and it ays they improve my fuel economy..but my friend said that it didnt help his truck at all it actualy made it worse..( He has a 2004 Dodge 2500 5.7 liter Hemi Ram)..now do you guys think it will improve fuel economy or make it worse??
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1987 K5 Blazer
Motor: 350 TBI
Trans: 4 Speed Manual 4wd
Stance: 32x 11.5x15(stock)
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RE: Better MPG?? - 1/5/2007 7:26:35 PM
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Joey P.
Posts: 29
Joined: 4/2/2006
From: Fairplay,CO
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Best way to improve fuel economy:
Other wise I think anytime you open up your intake or allow more air in, you should be able to gain a little but I would bet it to be a very trivial gain. What is pretty common sometimes is that you put on some add-ons and then all of a sudden your puting your foot in it more to see if it's got anymore HP gain or your listening to the air intake and peeling out at stoplights and things like that. I would think that would be more of the reason for loosing gas mileage. "The new hot rod" syndrome.....
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This space for rent.
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RE: Better MPG?? - 1/5/2007 7:39:07 PM
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swartlkk
Posts: 14499
Joined: 5/1/2005
From: Waterloo, NY
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A more free flowing intake that still draws in cold outside air should aid the engine in being as efficient as possible.
The theory behind TB spacers is that by increasing the volume of air between the intake valve and the throttle body, you will theoretically lower the RPM where peak torque occurs at. You won't increase peak torque, but just shift the whole torque curve lower in the RPM band. So your off idle torque will slightly increase while your high rpm torque will decrease. On motors that have a high RPM torque peak, this should be slightly beneficial. The 4.3L has its torque peak down so low and runs out of breath up at the top end as it is (stock) that a TB spacer really shouldn't really have any 1/4mi or MPG differences.
Best advice I can give to regain lost mileage is to make sure that your truck is operating as efficiently as possible. Make sure your tires are up to the proper pressure, the smaller the contact patch, the lower the rolling resistance. When was the last time you did a tune up? Try rolling into the throttle and drive it like there's an egg under the gas pedal. Use as little brakes as possible. Coast to stop signs. ETC, ETC...
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Kyle-
04 Rainier
My Restoration Projects
Please Do Not PM for Tech Help
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RE: Better MPG?? - 1/5/2007 10:15:50 PM
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nofear17bmx
Posts: 614
Joined: 11/21/2006
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Where do you guys buy your TB spacers? They are pretty easy to install correct?
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2000 Chevy Blazer 4wd 4dr 4.3L Auto
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RE: Better MPG?? - 1/5/2007 10:43:45 PM
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20Blazer00
Posts: 862
Joined: 9/16/2005
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I don't think that a TB spacer is a good answer for the '96+ CSFI VORTEC 4.3L V6 since the injectors now sit inside the manifold. The TB spacers most available were designed for the older TBI units to increase air/fuel mixture between the valve and the manifold therefore increasing HP. With the new CSFI design the air fuel mixture is predetermined with the MAF/IAT/MAP sensors so a Spacer is outsode of the loop of all but the MAP sensor. So as you can see most of the sensors needed to affect hp/mileage would not see the increase involume...only the O2 sensor would be able then to adjust for changes in the air/fuel ratio...
And since TBI systems did not use a MAF or IAT sensor adding an extra inch under the TBI would affect the amount of air/fuel mixture since the fuel is added before the spacer, so more volume would mean more fuel into the cylinder...
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Mark
2000 Blazer LS 4dr 4.3L Auto
1999 Grand Am 3.4L 4dr SE2 - Traded
2000 Honda Odyssey 3.5L 5dr Mini-Van
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RE: Better MPG?? - 1/5/2007 10:54:49 PM
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nofear17bmx
Posts: 614
Joined: 11/21/2006
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Ok...well I guess I wont be going with a TB spacer then lol.
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2000 Chevy Blazer 4wd 4dr 4.3L Auto
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