Just got back from a 200 mile trip with an observed mileage of 42 mpg. I can't recall ever having gotten more than 33 or so before the supercharger. I wasn't grannying it either, I was going 80-90 mph the whole way. Nice.

wow thats freakin awsome!!!!!!1!!11! one!

sweet!

what supercharger do you have?

ORIGINAL: z6 FoRiLLa

what supercharger do you have?


Jackson Racing SC @ ~6 lbs.

how do you like it? what's your set up? I'm looking at getting one for my z6. Do you have a problem with spinning tires? What kind of numbers are you putting down? Sorry for all the questions but im really considering buying one. Thanks

ORIGINAL: z6 FoRiLLa

how do you like it? what's your set up? I'm looking at getting one for my z6. Do you have a problem with spinning tires? What kind of numbers are you putting down? Sorry for all the questions but im really considering buying one. Thanks


Well keep in mind first that my Civic is an automatic [:'(] so my numbers are not what they could be. Better to compare relative numbers than absolute. Before the charger, my best 0-60 was 9.9 seconds. Since the charger, my best 0-60 is 7.4 seconds. My quarter with the charger is 15.9, but I think I could shave another tenth off of that since I hesitated between "2nd" and "3rd" when I did that run. I never ran the quarter before the charger but I feel sure it was in the 18's if not worse.

I'm running the charger with JR FPR (came with the kit), MSD ignition, cap, rotor, coil, super conductor wires, and a modified AEM SRI. Stock exhaust for now. Like I said the absolute numbers are not that hot but it's still a nice fat improvement over stock. 2.5 seconds off my 0-60 and probably 2 seconds or more off my quarter. That's pretty much what Jackson Racing advertises on their website, so I can't complain about the charger itself. My only complaints are the whistling from my AEM SRI under light acceleration is even louder now (sounds almost like a giant canary whistling at a hot girl) and the fact that I can't take advantage of full boost in higher gears since the automatic downshifts when I push the throttle too far. Just makes me wish I had a 5 speed even more.

Anyway, the low end performance is great around town, which is 90% of my driving if not more. Highway driving is greatly improved as well, although again, it'd be even better with a stick. Obviously my highway mileage has picked up a lot more than my city mileage has dropped (I get about 25-26 in the city now with typical driving, compared to 26-28 before). I don't really have any traction problems since it's an auto, although if I floor it from a stop or a slow roll, it will chirp the tires 3 or 4 times. Have to be a little more careful in the rain, since it's easy to spin all the way through first on takeoff if you're not careful. Same thing applies to "dirty" roads.

Smooth strong takeoffs from a stop and nailing it from cruising speed are a lot of fun. Throws you back in your seat good and hard. Just don't do it too much or A) your mileage won't be anywhere near 25 and B) everyone around you will think you're a jackass :D

Holy crap. I do NOT get it. I wish I got that kind of mileage stock, let alone with a supercharger...

anything other than displacement that adds power does so by increasing the efficiency of the motor, so if you are using the more powerful motor approximately the same as you would have used the less powerful motor, then mileage should go up. notice he said he wasnt grannying it either, but he didnt say he was driving noticeable harder than norrmal either. hell, if he did granny it, hed probably break 50 mpg.

Then he could find an 18-wheeler to draft off of and hed probly break 65. What kind of gas mileage do you think I'll get on the highway with the turbo?

ORIGINAL: XCM828

Then he could find an 18-wheeler to draft off of and hed probly break 65. What kind of gas mileage do you think I'll get on the highway with the turbo?


hahaha that struck me as really funny for some reason :D

I get like 20mpg on my civic. I might be able to convince my dad to get a S.C. if i can more than double to fuel economy. ( i think its a long shot)

ORIGINAL: AgentofDarkness

I get like 20mpg on my civic. I might be able to convince my dad to get a S.C. if i can more than double to fuel economy. ( i think its a long shot)


Jeez man 20 mpg? Is that city or highway mileage? I could probably floor it everywhere I go and still do better than that. Are you sure there's nothing wrong with your car?

ORIGINAL: Auto98EX

ORIGINAL: XCM828

Then he could find an 18-wheeler to draft off of and hed probly break 65. What kind of gas mileage do you think I'll get on the highway with the turbo?


hahaha that struck me as really funny for some reason :D


It really does work. I do it all the time on the long trips home. You can feel it suck you right in when you get in the slipstream and if they switch lanes you don't really have to do anything, it'll pull you right over. Plus, if they're going 75mph+ you know there's no cops around cause they always know.:)

yeah, i used to do that till i replaced my crappy cracked windshield. now i would be pissed if a rock came up and chipped my new one.


BTW, turbo should be capable of 45+ on the highway.;)

ORIGINAL: amg6975

It really does work. I do it all the time on the long trips home. You can feel it suck you right in when you get in the slipstream and if they switch lanes you don't really have to do anything, it'll pull you right over. Plus, if they're going 75mph+ you know there's no cops around cause they always know.:)


Interesting... how far behind them can you be before you're "out of the zone"? I wouldn't want to be tailing a trucker too closely, they might get annoyed or I might get paranoid about running into them.

ORIGINAL: sacicons

yeah, i used to do that till i replaced my crappy cracked windshield. now i would be pissed if a rock came up and chipped my new one.


BTW, turbo should be capable of 45+ on the highway.;)


Words of wisdom.

Depends on his speed and what type trailer. Zone will get longer as speed goes up.

That's awesome man, glad that thing is working out for you!

Interesting... how far behind them can you be before you're "out of the zone"? I wouldn't want to be tailing a trucker too closely, they might get annoyed or I might get paranoid about running into them.when i would do this, i would get inside of one car length, but it was very hairy, and it takes all of your concentration. i dont really recomend that. but i think they didnt mind it after a few minutes, because when they needed to move over and they threw their blinker on, i would move over first, then slow down and flash my headlights, giving them room to come over, since it can be tough for them to get over in traffic. they usually flashed their tails to thank me after that too, and they would flash the brake lights to warn me before they had to slow down after i had helped them out. kind of a win-win.

so do you have a problem with spinning tires? Because that's one of my major "make it or break it's"

well, the auto probably helps in that department.

ORIGINAL: sacicons

anything other than displacement that adds power does so by increasing the efficiency of the motor, so if you are using the more powerful motor approximately the same as you would have used the less powerful motor, then mileage should go up. notice he said he wasnt grannying it either, but he didnt say he was driving noticeable harder than norrmal either. hell, if he did granny it, hed probably break 50 mpg.


This doesn't make sense. Regardless of the power adder, it still takes X amount of power to move the car X amount if speed. You still are using the same motor to get the same work done. During cruising speeds, you shouldn't even see boost. If you were comparing a larger, heavier motor to that of the boosted Civic motor making the same power where the added weight of the blower does not overcome what the added weight of a bigger motor would be, then you could probably compare gas mileage figures.

Boosted cars sometimes get good/better gas mileage because the compressors heat up the air which helps atomize the fuel better. Once you start hitting boost, you require more fuel which will not increase mileage.

Between Phoenix and Denver I got a best of 31-32 mpg on my stock SHO. Once I put a Vortech supercharger on, my milage went to 26 mpg @ 80-85 mph and 24 @ 100+ mph. Obviously, as you go faster you work with more drag. Much of the loss in gas mileage was due to my foot and the richer tuning during engine deceleration.

but comparing a smaller boosted motor with a larger one that weighs the same doesnt work out in favor of the larger motor, because a boosted engine (usually) has higher VE, which will make more power, while wasting less. and im thinking your mileage went down partly because it was boosted previously, so you are probably messing with the VE of your stock motor, and its probably running pretty rich, esp with a supercharger, which runs kinda hot anyway, so it would need to run a little rich if you raised the boost, unless you had water/alcohol injection or something similar to lower intake temps. a turbo can raise the VE even more, since it is using wasted exhaust gas heat to compress the air, instead of the crankshaft.

The smaller engine and larger engine in comparison would not weigh the same. The supercharger would not make up the missing weight you would find in a larger engine. Both motors, small and large, at 50 hp are burning approximately the same amount of air:fuel.

Also, my motor was orginally normally aspirated. I later added a supercharger with 11 PSI. Even if I was boosted stock, adding more boost would only burn more fuel under higher boost pressures as MORE air is making it into the motor. I DO have water injection, 2-stage to be exact, but it is not activated until you see boost. The first stage is at 4 PSI and the second is activated at 8 PSI. Regardless, cruising would not be affected.

Under cruise conditions, the engine does NOT need to run any richer. The extra heat created under little to no load is not enough to cause detonation at part throttle. If anything, the extra heat will help atomize the fuel better.

VE does not refer to the parasitic loss through being run off a crank versus exhuast driven. If you look at the definition of VE, you'll find it says nothing about parasitic loss. It is about how much air you can get into the cylinders.


Volumetric Efficiency

The ratio of air inducted per cycle to the total displacement of the engine. Commonly referred to as the engine's ability to "breathe."

can anyone convert 42 mpg to km/lt

ORIGINAL: XCM828

. What kind of gas mileage do you think I'll get on the highway with the turbo?


its insane man, youll be amazed.

ORIGINAL: luke6450

can anyone convert 42 mpg to km/lt
about 18.5.

wow, i actually though having a super charger or even a turbo charger would increase fuel consumption.... This really amazes me and makes me want a super charger asap, better start doing my research

It will increase fuel usage..... When you are actually allowing more air into the motor by opening up the throttle body. Anytime you are in boost, you're taking in more air than you would NA, therefore using more fuel.

how much would this cost?

ORIGINAL: yamahaSHO

It will increase fuel usage..... When you are actually allowing more air into the motor by opening up the throttle body. Anytime you are in boost, you're taking in more air than you would NA, therefore using more fuel.


Exactly. But, it also makes the engine way more efficient. You get more power put out per stroke of the cylinder than the same engine NA.

Yamhaha is right.....but...when im under boost my milage i crappo........however on the highway at low rpms i get INSANE gas milage........even thou the turbo is not BOOSTING the engine, its basically injecting the air so the engine doesnt need to suck it in.

huh... thats interesting.

i make better gas mileage when i just drive my Si. 35 mpg.

Yea well im getting near 50 mpg on the highway.

ORIGINAL: XCM828

ORIGINAL: yamahaSHO

It will increase fuel usage..... When you are actually allowing more air into the motor by opening up the throttle body. Anytime you are in boost, you're taking in more air than you would NA, therefore using more fuel.


Exactly. But, it also makes the engine way more efficient. You get more power put out per stroke of the cylinder than the same engine NA.


The VE goes way up because your stuffing more air into the cylinders.... But that is the whole point of FI.

Warmer air atomizes gas better, so mileage is know to go up.

Agent, there's gotta be something up with your car. I couldn't get 20mpg if I tried. Have you tried replacing the oxygen sensor?

The numbers from the supercharger are quite impressive, I must say. My best was 46mpg, but I was babying my car like a half-broken egg. I usually get 35-39mpg going 70-80 on mostly freeway driving.

Well, I finally did the math... I got about 35-36mpg driving pretty hard over a 242 mile period. 50% of driving was at 80mph+, 45% was a TON of 3rd gear pulls on a 2-lane 55mph highway. and the rest was city driving.


I should mention that my car is back to stock witht he execption of an SRI.

Interesting thread!

Hotter air will vaporize fuel better, providing greater fuel burn effeciency. Could hotter air be provided by simpler means than a turbocharger that isnot doing much other than providing air at ambient pressure? Exhaust manifold heat exchanger? How about boosting the fuel temperature directly, before the injectors? Combination of both maybe?Fuel vaporizing techniques have been around since the 30's (the Pogue carb for example using white gas, which was patented, its history/ validity still a bit of a mystery). With 4 dollar gas staring us in the face methinks this may well be worth pursuing.

I have a 95 coupe salvage rebuild under way, and really want to experiment with some of this....

northwoods

Very interesting theory. The problem I see with it is that the improved gas mileage is aproduct of warmer intake temperatures in conjunction with the compressed air provided by the supercharger. Think about mcguyvering a small electronic supercharger if you want to test your theory.

the idea with a turbo for increasing mileage is to not use the boost, as mentioned earlier in this thread. The guy noted better cruising mileage with the turbo than without. At first seemed counter- intuitive as more pressure will result in more fuel = less mileage. If the turbo does nothing but ease the engine breathing by countering the pressure lost through ducting, filter, etc (which by iteslf should give a small effieincy increase as the engine does not have to use energy to pull the air, but instead recovers some power from the exhaust to do this) and providing an increase in air temp to aid vaporization. The turbo could do both, I just don't like the complexity of another wiget spinning at 100k rpm that will eventually have to be repaired.

wow i get about 24-26 city. the most i ever had was 35 when i did alot of highway driving. did u do any work on the engine b4 u installed the supercharger?

I was not asking for a lesson in supercharging theory. If you think by simply increasing intake temperature, you will atomize gasoline efficiently enough to make a noticeable gain in mileage, i advise you to move to a city bordering the equator to test your hypothesis. Even at neutral vacuum values, a turbocharger will aid in drawing air into the combustion chambers.

arust45,

I will test my theory as I see fit, and do not need to move anywhere in order to do it. If that is how youwould test this idea out by all means pack up and go.I was unclear as to your comments regarding why a turbo gives a boost in mileage. You were not being lectured to. Keep your rude remarks to yourself! I am finished with this thread!

As Bill O'reilly says, "i'll give you the last word." Even though he's an a'hole and never does ;). Even I have my moments.