To gain better gas mileage on your Silverado, let the engine breath better. Replace the old intake box with an aftermarket one because theres no crimps in the tube, and its a higher flowing filter - but be sure to make sure its a dry filter, and not a oil based air filter because you dont want to end up placing the Mass Air Flow Sensor down the line. I've seen it too many times. You also want to throw headers on there you do gain better power, but your also opening up the exhaust ports to flow much better too. And of course if you match it with a Borla Exhaust, you'd be top of the line (Until the programmer then you'll be top of the heap)...! You'd see a great gain on performance and not much, but a definite difference on mileage. If you have any questions feel free to email me at [email protected]
there are some custom performance shops that are specificly for v6 engines one is supersix.com if its still around, this and other similiar shops can do reflashes for the computer if you send it in. If you search you can find some that will reprogram a SC 3800 for a five speed and to be put in a cavalier, so they chould be able to do yours or give you suggestions, or just do the bolt ons that are available and a low budget ignition upgrade
Well, the prolem is that it normally takes quite awhile before any of those mods pay off in term of MPG gains. Not to mention, there is no guarantee that you'll even see an increase in MPG. Might gain, lose, or have no change at all.
As I always say, mod for performance, not MPG. The best bet is to do all of the standard things that have been said a million times... check tire pressure, maintenance, drive slower, reduce weight, etc.
i know im gona hear about it but i like K&N products, take the oil is evil lightly. i have had a K&N in my truck for over 100,000 miles with no problwms and in my previous 2 trucks with no problems, as far as your truck goes i recomend an exhaust , i have flowmasters, but what ever your sound is will be fine, and dont waste money on TB spacers. headers work great and a new MAF sensor will help too. also there is an air diffuser in your throttle body, you can cut it off with a dremel or buy one already shaved. s-10crewcab.com has a great right up on it. also a tune will help alot, like westers or pcm4less or any of the good places. i own a 4.3 in a 2002 silverado, its 2wd and i get 18 city 23 highway, mods are in my sig.
Sounds like you have a set up like I did in my wife's 08 Silverado once we put the cat back,K&N filter changed over to synthetic oils our best record MPG was 27 on the highway still only gets 16-17 in the city.
2008 Silverado long bed 4.3 V6 3.42 gears Auto trans
Cap on the back
MagnaFlow single in dual out with 3.5" SS tips
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