Was wondering something im sure some one here can tell me. This is gonna sound dumb but bare with me for a minute. Say just for ***** and giggles i wanted to run my blower sometimes and not run it other times. In otherwords i buy a belt that will fit everything except the Whipple pulley and tensioner, and install that when i go on any long trips that i would not want to utilize the blower or have any need for it, thus save some wear and tear on it. Then use my standard belt that fits everything including the blower on times i did, like at the track or around town. Can i develop a specific tune that will work with the truck and 42lb injectors that i can flash to the PCM when i dont want to use the blower, then when i run the longer belt and use the blower, upload the F/I tune? Follow me? Would it be as simpleas just installing the smaller belt and loading a non-forced induction tune on the times i dont want to use it?

Or maybe my question should be on the few long trips i take a year, where the blower is not really needed, how much wear and tear am i actually putting on the blower in the 600-700 mile round trip? Would it be worth while to set up a non-F/I tune and throw on the smaller belt? Perhaps i should use a clutch actuated pulley and throw a switch in the cab...LOL.

 

You'd kinda have to pull the blower off. Idk how well it would flow w/ a still blower in the airflow.

 

So does the blower spinning have something to do with the motor getting air even when not in boost? I thought that was the purpose of the bypass valve, to allow the air to pass by when not in boost. The normal operating position of the valve is open, so maybe I would have to unhook the vacuum line to the bypass valve as well. Other than that, i thought it should work, but not sure.

 

i dont think it would be worth the trouble to do

 

Thats kinda what im getting at, just tryin to judge whether its worth the time to throw a new belt and tune in for the long trips to save the wear and tear on the blower. Maybe the wear and tear that 600-700 miles would do is so minimal, its not worth it. Time wise its no big deal, maybe 10 minutes total in changing the belt and tune, once i have the tune made and saved. I will be getting EFIlive in the next couple weeks, thats why i am asking.

 

No- Both your whipple and my Kenne bell produce boost all the time, now it might not be manifold boost but the blower is compressing the air and the by pass valve bleeds the pressure off. A roots blower relies on the fact that the blower is pushing out more air then the engine can suck in thus creating boost, where at a twin screw actually builds boost in the blower housing itself and uses the by pass valve to bleed it off. The by pass allows the boost to blead off back into the inlet of the supercharger. Does this help any?

 

Ahhhhh, now im readin you. Makes sense, so the screws are aspirating my engine regardless of whether its pure boost or whether its been bled off by the bypass valve. Theoretically the only way to do what i am talking about would be to move the throttle body back a little and put a "Y" in the intake pipe after the throttle body running to another "Y" at the intake manifold thus bypassing the blower all together. Then i would have to put valves in there to direct the flow. Obviously im not doing that....LOL. So the answer to half my question is "NO, it cant be done that way". And im guessing the wear and tear the blower would see from a 700 mile trip is not that much anyway, plus there is nothin i can really do about it...LOL. Close this stupid thread! Thats what i get for thinking about stupid stuff anyway...

 

Good thread i often wondered the same thing.

 

The only stupid question is the one never asked man. As you stated the air flow to the engine is always passing throught the blower it is just that because the blower is constantly making boost it bypasses the excess... I wouldnt worry about a 700 mile trip.

 

This might also sound dumb....but since we're speculating here......I know it's Hollywood...but I remember the movie Mad Max. He had what looked like a big 671 sticking out of the hood and the blower pulley seemed to be activated by some type of clutch mechanism operated by a lever on the shifter.......Is that even possible????