FastCrewCab4x4

How big of differance in fuel mileage did you all notice when you supercharged you trucks? Was it drastic. For the price / power you get from them it's worth it. But if it totally kills the fuel mileage of a DD then is it worth it. does it then just become a race truck? I'd like to do it if the F/M isn't waisted..Thanks

dry_kill

iTrader: (12)

i may be wrong here no idea, just going by what this guy posted on ls1tech but supposedly the sts turbo actually gets you like 1-2mpg

1slow01Z71

iTrader: (36)

turbos generally you get better mileage if oyu keep your foot out of it and even some with s/c's have claimed gains although I know of no one personally with a s/c that gained mileage.

treyZ28

Turbos will definately NOT get your better gas milage, especially if you do a rebuild intended for a turbo motor.


Typically, the order is NA/turbo/SC
look up typical BSFC values. NA is around 0.5, turbo is around .55 and SC is around .6

(meaning it uses 0.5lbs of fuel for every hp produced)

CrabhartLS1

bypass valves on centrifugal superchargers keep you from loosing mileage until you put your foot down... Dunno about whipple or magnacharger style.

treyZ28

you're still encountering some losses over NA.

Big losses come from dropping the compression ratio.

1slow01Z71

iTrader: (36)

Sure dude. There are plenty of people on here that ahve gained mileage from putting a turbo on their vehicle. Jerry2500 gained like 2.5-3mpg.

If oyu drop CR put a turbo cam in etc etc of course oyu will lose mileage but if you only add the system and keep your foot out of it in most cases with a turbo you gain mileage from what I have seen/read. Hopefully soon I will be able to verify this myself.

treyZ28

Performancetrucks.net: physics and logic need not apply.

TurboGibbs

iTrader: (6)

I agree I have heard of several gaining mpg with a turbo and even some with a magnacharge and a centrifugal. All these cases are with fairly low boost and a good tune. A smaller more efficient turbo for your app. would be your best bet to improve mileage. It isn't something i'd count on or worry about though.

TurboGibbs

iTrader: (6)

I understand what you say about drag with a blower and not increasing. i don't see how an increase in efficiency could happen by any means but with a properly sized turbo the entire efficiency of an engine increases. You have less pumping losses by being able to use more of the heat produced by the engine. We all know that an engine is basically a device that converts heat energy to mechanical energy.