TRD Supercharger increase MPG

stoichoimetrec is basically air fuel ratio for auto motive.it is measured in grams
generally it is 14.7 grams of oxygen to 1 gram of fuel,so when you increase the air going into the engine you need to increase the amount of fuel to keep it at stoich,so anything that increases the air into your engine your ecm has to add more fuel.but simple answer is its hardly noticable maybe a mpg or two less.people anoy me with this stupid skinny pedal slang.

 

there is no way your mpg will improve with a supercharger. heck, TRD even admits it in the FAQ section of the instruction manual

smiles per gallon goes way up, but miles per gallon will go down a little.

just think of all the oem supercharged trucks and compare them to their NA counterpart. The Lightning? MPG is not better than a NA F150. Harley Davidson F150 gets even worse MPG.

 

Ditto what Lunchbox said. My understanding is the TRD S/C bumps only moderate boost which is why mpg doesn't suffer that much. If you were to really push the PSI up, a cam change would probably be necessary.

 

My last tank I averaged over 19 MPG with my SC. It was about 95% interstate, so I figure that's best case scenario for me. I consciously try to drive in a conservative manner also though, not just romping it constantly. I was leery at first, but love it now.

 

sthoicomentric is 14.7 grams of air to 1 gram of fuel so more air means it needs more fuel
to be easy but the loss isnt much comparded to the horsepowr gains allso water meth injection works better than reducing timing to stop engine knocl.

 

woops didnt meen to post twice

 

Straight from TRD:

"7. How will installing a supercharger affect
my gas mileage?

During part-throttle driving, around town and highway cruise,
for example, the supercharger should not noticeably affect gas
mileage. Overall fuel mileage decreases with increased full throttle
operation, and decreases more when supercharged. Simply put,
additional power requires additional fuel and during boosted,
full-power operation, the fuel mileage will decrease more than
when the engine is normally aspirated."

/thread?

 

Except nobody invests $5k+ to idle around town at 20% throttle.

Like I said before, I'm not saying that it will INCREASE MPG because I don't have the data to support such claims. What I do have is first-hand experience on driving in situations where it SEEMED like a supercharger could actually help but that isn't an across the board statement which is what it seems others are trying to do. I experienced this same phenomena in the late 90's when the newer Grand Cherokee's came out. There was a V8 and a larger V8 and when towing in the mountains the larger V8 actually got substantially better fuel economy. This can't be applied across the board to city driving which is what lots of people then tried to do. It doesn't work that way. Only in situations where engine load made it advantageous to having more torque available. My buddy bought a Tacoma this summer very similar to mine only not supercharged in Washington D.C. We flew out and drove it back and one thing I noticed is that as we crossed I70 from Kansas into Colorado the transmission would start kicking down quite a bit to maintain highway speeds as the elevation increased. At first I thought something was wrong with his truck as it was jumping back and forth and felt powerless in either gear. I quickly realized that since my truck was supercharged it was able to easily maintain the same speeds while staying at 6th gear in lower RPMs because more torque was available at that RPM range under engine load. There's no doubt that my truck being supercharged would have been more efficient on how it delivered power and would likely have given slightly better fuel economy.

It's more complicated than gas plus air in equals power out but at a basic level that is accurate. There are more variables that must be taken into account and my personal experience is that in some conditions a supercharged truck will actually get better fuel economy but for most people this is just a very slim slice of the pie of how they use their truck. In summary, just plan on it going down slightly and in same rare instances you will get slightly better fuel economy but it won't be enough to average out the MPG overall and certainly not enough either way to sway your decision on whether to buy one or not. I mean if you're concerned over a couple of bucks per tank then you're not ready to take on the $5k+ price tag to begin with.

All that being said, I wanted a supercharger because it makes the truck night and day different to drive. To think this doesn't include a price tag (both up front and long-term) is just silly. If I wanted fuel economy I would have bought a Prius.

 

Pretty difficult to argue with this.


I was considering an SC to help with towing. I thought initially that the extra torque would boost my MPG's going uphill, but I guess it doesn't work that way.


Maybe there would be some reduced wear and tear on the motor and trans because I wouldn't be running at such a high RPM in order to maintain speed. For instance, I could hold 60 mph on a hill in 4th gear instead of downshifting to 3rd.


I was hoping I could recoup that $4800 cost via MPG's but the best laid plans of mice, men, and monkeyface fall apart sometimes.

 

No way in hell. You know how long it would take you to recoup $5k in fuel savings at 1 or 2mpg? That doesn't even take into consideration the difference in cost between Midgrade & Premium which you will have to run with a s/c.

 

The only legitimate reasoning behind getting a supercharger is to make that big gauge in the middle move faster.

 

as I said before stoichiometric is basically the fuel air relationship your truck wants to run at
its 14.7 grams of 02 to 1 gram of fuel normaly read as 14.1 -1 as you increase air your engine wants more fuel, superchargers use a bypass valve that redirects the air around the s/c when not in boost to lower parasitic load when not under boost saving mpgs but over all you loose mpg gain horses,any one that knows what theyre talking about will tell you there is no such thing as free power theres never a 100% to 100% actually the average engine is actually about 33% efficient allot of energy is lost.

 

I wanted this soo bad but I'm already getting about 14mpg highway. I have 33's and 2.5 lift. So I can only imagine how worst it could be

 

I gotta stay out of the skinny pedal.. granted, I've only had mine for a few weeks.. but my last tank I got 276 miles.. definitely lower than my usual 315-330.

I was driving through a windy area and fighting the wind the whole way crusing at about 80.. this was for a good hour and a half of driving.

 

If the engine has to strain less to maintain a speed then I could see fuel economy increasing or staying steady. Now I would expect city driving mileage to drop a bit, but highway should stay mostly the same. 's my $0.02 anyway.

I'm seriously considering a SC for my truck. Forced induction is nice when altitude and mountains are involved though it doesn't seem necessary as my 6 speed has no issue going up mountains at speed when it's moderately loaded. I think the automatics run at lower RPM's at highway speeds then the manuals which make them shift more but give higher mpg's.

I also didn't buy the truck for mpg's, that's what I have a motorcycle for.

 

From someone who actually tows with the supercharger it's helped me out quite a bit. I've towed my boat to the lake almost every weekend this year I've averaged about 8-9MPGs without and about 13-14MPGs with the supercharger. Stays in 5th the entire trip on the freeway with the supercharger when it would downshift a lot without it. The boat weights almost 6k pounds.

 

If someone is worried about having to spend a few extra bucks at the gas station, a $4,000 supercharger probably shouldn't be on your list of mods.

If you have the extra $ and the need for speed, then it's the best bang for the buck.

 

See this is what I'm thinking. Even though I'm not towing. I'm sure the extra power can help move the 33's I have.