Quote:

Originally Posted by Btravelen

More power should require less throttle to get it going and keep it going. Likely though, if you can't keep your foot out of it.

Then why do the Poniacs that come stock with superchargers get like half the fuel economy as the ones that don’t have the superchargers (same engine)?





Actually pretty much every supercharged engine I have seen gets like 50% less fuel economy then simmilar sized engines that are not supercharged.

 

Stuffing more air in it requires that you add more fuel.

 

Well cold air intakes alow the engine to consume more air and I have never seen a CAI that does not improve fuel economy let alone reduce it.

 

I'd like to see objective evidence that supercharged engines get 50% less fuel mileage, provided they're driven the same way as non supercharged vehicles. Stuffing more air in it requires more fuel and produces more power. To get the vehicle moving and to keep it moving should require less throttle. Theoretically.

All the chip/tuners claim better mileage by 'adding more fuel'. IF YOU CAN KEEP YOUR FOOT OUT OF IT.

 

Sure. I work on at least 3 different vehicle every day. The newer Pontiac Grand Am / Prix's have MPG gauges on many of them. Well the supercharged ones that roll into the shop are sitting at like 13 - 17 MPG on the gauge on average. The non-supercharged ones roll around 18 - 23 MPG on average. And I have probably worked on a good 10+ of them by now. And they use the same engines.

 

A CAI may increase MPG for those vehicles that are severly choked due to noise emission and space considerations. This is due to reducing pumping losses. They may also increase MPG at WOT but who really cares abou that. :X-10 That's really where you see the biggest performance difference with a CAI anyway.

A supercharged engine will normally have a lower MPG reading than a NA engine even when not on the boost because the engine has to still spin the SC.

Once on the boost...well, you just can't get more power without more fuel.

But the less pedal idea certainly has merit.

 

Whats WOT?

 

WOT = Wide Open Throttle

 

So are you saying in some vehicle a CAI can reduce fuel efficency? Because I was thinking of a CAI for my new X but it would be mainly to gain more fuel economy.

 

just curious, how long have you been a tech for? and you work on pontiacs? and your asking what WOT is? start reading the shop manuals...

 

I am a car audio tech not a automotive tech. SPL stands for Sound Pressure Level. I install remote starters, aftermerket mobile electronics, and I do custom car audio fabrication / modifications.

 

Never in my statements did I claim that they could REDUCE MPG.

 

Sheesh!!!!!