Supercharging=better gas mileage?

[pihkal]

I was wondering if anybody knows if supercharging does increase gas mileage, Ive heard different things from different people.

[pihkal]

I was wondering if anybody knows if supercharging does increase gas mileage, Ive heard different things from different people.

[pihkal]

I was wondering if anybody knows if supercharging does increase gas mileage, Ive heard different things from different people.

[KenP]

Welcome to the forum. This has been discussed many times. I used the "Find" tab and came up with a couple very quickly. I hope they help:

http://elcova.com/groupee/forums?a=tpc&s=2826088551&f=5106011751&m=854103847 &r=854103847#854103847

http://elcova.com/groupee/forums?a=tpc&s=2826088551&f=5106011751&m=103600585 5&r=1416092955#1416092955

[pihkal]

thanks for the info

[KenP]

No problem, and enjoy the forum.

[NU2H2]

I too am looking to go the S/C route. I am looking at the Vortech or Radix magnacharger. I know as I am in the forced induction business that 93 Octane has to be used and therefore the extra power to no better gas mileage is a trade off to better performance. Just curious what the concensus was on S/C choice. I must admit I have not been in a blown H2 so I can't comment on power increase but extra TQ will be nice to have on hand
Jonathan

[KenP]

Dude, you swiped my old butt avatar. (Yeah, yeah, yeah, I normally don't where stuff like that, but I was feeling cheeky that day... And felt particularly thin... ).

Roots style SC seems to be the most popular.
http://www.lingenfelter.com/performanceh2_hummer.asp
The price for this package keeps coming down .

[NU2H2]

I have to say you have the nicest Ass of any guy I have never seen
Thanks for the tip lingenfelter is a little too pricey but i guess that Radix Magnacharger is your choice of blowers. Know of anyone with a centrifugal on an H2?
Thanks

[HUMMERcustoms.com/TAZ]

My research and My Performance Shop recommends the Radix magnacharger. That is all I can go by is he words of mouth recomendation. So many on this sight has recommended Radix.
Rick

[KenP]

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR> Posted by: NU2H2
I have to say you have the nicest Ass of any guy I have never seen <HR></BLOCKQUOTE>All fake. Trust me, I had toilet paper stuck up the...

http://magnacharger.com/pr003.htm

[MSeeb]

I have had my Intercooled Magnacharger installed now for about 6 months and have seen a slight decrease in gas economy. Roughly a 1/2 mile per gallon decrease. However having the supercharger I tend to have my foot in it more often, blowing off the Z71 trucks. Having the additional power far out weighs the slight milage decrease. I would recommend the Magna SC to anyone. Good Luck!!!!

[HGW]

Vortech and others make centrifugal chargers for the H2---specifically the 6.0L Gen III engine.

The difference is in design and use is considerable. The roots type used in the MagnaCharger are considered the best of its kind--have one on my H2. They are designed for instant throttle response and therefore give you an instant punch you can feel when you stomp on it. They also work well at highway or better speeds. Their power curve is flattens out at prolonged high rpm due to the inability of the intercooler to provide long term cooling. On a 1/4 mile run, they peter out in the last 1/8th mile. For long trips when towing, they get hot.

The centrifugal charger provides more air the faster your engine turns. They have a linear power curve at the high end and do not create as much heat. They do not give you the instant punch because they need some RPM to really start working. They are not efficient in the first 2000-2500 RPM (an estimate--no dyno here right now). However, they work like hell after that.
They are also simple in design, run cooler and last longer.

If I was towing, I would have the centrifugal---you will be passing other in the 50-70 MPH range where there is lots of power. If you want the punch on the street to play with the rice rockets, then a roots type would be your choice.

[PARAGON]

Great explanation H2M&W. Now some theory thinking. Assuming both were belt driven, why couldn't a dual charger be made. Granted tuning would be a bitch but in my mind it seems possible. Follow my thinking a little here:

You have the roots mounted on top of the intake providing charge through the use of the twin screw and an intercooler. Off the body of the roots you have a hole/port where the output of the centri charges the air of the roots' body. Have a valve there that opens upon pressure increase from the centri. I guess my question would be, does the roots lose boost as well as efficiency after the extended use and it heats up? I am assuming boost does drop and the centri would be picking up the slack then.

Dialed in, this would keep a charge in the intake during the entire RPM range and maintaining a constantly increasing curve.

Ok, now poke holes in the theory because I am sure someone would have already thought of something like this if it worked.

[HGW]

Both chargers are belt driven--so when the second kicks in fully, your boost would be way high--too much for the 6.0L. Fuel management would be a bitch as would programming. I doubt the PCM could adjust for this high boost condition.

Cetrifugals are fairly new and are used on vehicles that already have good low end torque--like a 350Z for example. The engine gets the machine going before the cetrifugal become efficient. They run like the rice rocket that they are.

When you use a centifugal on an H2, it runs great except you do not get the punch off the line because it is a big heavy box without enough low end torque. There is no noticable change in power right off the line. The centifugal in the mid band range runs cooler and gives great power in towing situations.

The roots gets hot after a long WOT, like the last 1/8 mile of a 1/4 mile run. This heat retards the timing, making the engine less effficent--the SC heated air reduces the amount of air---therfore fuel into the engine. This can be solved by a larger intercooler---I am having one built right now. However, for street use, a larger intercooler is a waste of money. The roots run great under any street condition.

My only advise was that if you tow a lot, the centifugal is cheaper and answers the mail power where you nedd it---in the mid band.

Feel free to ask more...........