Does Turbo effect gas milage??
 

Now since there is no doubt that I will get the FRS...the next question is should I get a turbo kit installed....But I dont want to get one if its going to bring down the gas milage to what my truck is sitting at now...kinda defeating the purpose of making the switch.

you will lose gas mileage, but you shouldn't be getting what a truck gets. your mpgs should only take a hit if your turbo is spooling. So as long as you don't have it spooling at 2000rpms, or as long as you're not just flat out all the time, then your mpgs shouldn't suffer much.

Depends on how you tune it. At partial throttle you may even get better fuel economy but at full throttle, you will always get less fuel economy because you are using more fuel to compensate for the extra air. But keep in mind a turbo kit will be expensive, lower reliability, void the warranty, add weight, make the throttle less responsive, etc. It's not worth it IMO.

Never took that in consideration...hmmmm

Into consideration

good lookin out lol

Not much to say that hasn't been said already, lol. You could try asking the guys in the turbo subforum what they're getting for mileage. If you're spooling the turbo all day long your mileage is gonna suck, but if you can stay out of it during your commute or whatever, it shouldn't go down too bad so long as it's tuned well.

I'd say you might drop from 29 to 24mpg, depending how you drive it, turbo size, tune, etc.

Im only going to tell you from experience. My last car came from the factory NA and I boosted it after a year. I actually gained a good 3-5mpg when driving slow and normal. WOT and it was a guzzler

I've driven Saab turbos for most of my driving life. They got solid fuel economyl; however, when you're using a lot of boost you are going to use a lot of gas. At slow speeds and low boost, a turbo will improve gas mileage, BUT who gets turbo to use low boost?

Financially this question is very ironic. Don't worry about it.

If you are worried about gas mileage… then a turbo upgrade is probably not ideal for you. I would suggest leaving it stock for best gas mileage…

-Nate

that's a pretty valid point. One reasons engines make more power when they are tuned or modified is because they are more efficient and have a greater power density. Certainly with a turbo, while on boost, will be using quite a bit of gas, but if you say out of the boost for easy drives it should return the same mileage. There was a test done in Super Street a number of years ago for their ultimate modified car...in one of the tests they had to do a mileage loop. I believe the winner was a turbo MR-2 that got around 44 to the gallon. Although that number is pretty damn high, I would expect an FR-S to be able to say in the 30's with a good set up.

I drive like a granny right now on a stock FRS i get 29MPG in the city. I think i will get 1-2+ mpg when i do add a little power and still drive like a granny. Shifting @2000-2500 RPM

You will get the same effect with a turbo. But you will be more tempted to step on the throttle. So when you drive agressively you will lose MPG

Consider this... One of the biggest hits you'll take on MPG on this car is when you upgrade the wheels and tires. A wider stance is far less aerodynamic and they chose these crappy stock tires for a reason you know. It was a compromise between MPG and performance. Bolting on 50% more HP you will NEED better tires.

Just something else to consider.

If you don't wana lose your MPG, then don't get the kit... Just do full bolt-on's...

You got too explain...I dont know shit bout engines and im using this to really get hands on

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He's saying, to avoid any worries about gas mileage, just avoid a turbo and do bolt on modifications. Bolt ons are just simple mods like changing your exhaust and air intake. They generally just allow you to unbolt the old part from the engine and put your newer mod on, so thats why they are called 'bolt-ons'. You won't get a massive power increase from these types of mods like you will a turbo, but there are no worries about effecting the car's mpgs.

Also, a great thing you can do is get a tune. A tune will increase power and performance and give you better MPG. Full bolt-on's consist of: header, overpipe, midpipe, cat-back exhaust, aftermarket intake, clutch, flywheel, and better tires for traction. There are plenty of parts to simply replace the stock restrictive OEM parts.

I've been running my turbo on my car for a few days now and i can say without a doubt that with my limited time driving it my average MPG has dropped quite a bit. With all my mods before turbo I averaged 24-25MPG, now I'm averaging 20-21MPG. When I am burying my foot in the throttle and playing the car is even worse. I will be taking a trip from Phoenix to San Diego soon which is all open highway to get a good estimate of highway MPG, I'm expecting relatively similar numbers to what I was getting before at about 28-30MPG, but we'll see.

I can attest to the expense of a turbo setup, a turbo kit might cost $4-5k but that doesn't include all the other things you should upgrade with a turbo, like wheels, tires, clutch, exhaust, tune, gauges, etc. I have about $20k invested in parts in my car and most of it is performance oriented.

You also do add weight...in my case about 50lbs was added to the front end, but with 7PSI boost I'm making 255WHP, almost 100HP over stock, so the weight gain is hardly an issue. You can get rid of that added weight by changing out your stock flywheel, taking out your spare tire and all the res of the stuff in the trunk, and a few other minor weight reducing options if it's that important to you.

Last but not least, these turbo kit's do not lose responsiveness of the throttle, in fact with a lightweight pulley and clutch/flywheel installed my car revs like a sportbike...if you don't believe me:

http://www.youtube.com/watch?v=D_cKb...ature=youtu.be

These little FA20 engines are built for boost it seems, hell they even include bungs on the engine case for oil supply lines. It's been a long expensive journey, but if you are considering a turbo, you have to weigh all the good with all the bad. If MPG is a big factor FI might not be for you, hell any engine modification beyond a tune would probably be a bad idea if MPG is the net goal. If you are looking for more performance and can live with slightly worse MPG then FI is a viable route.

oh boy. let me guess you are buying auto tranny?

Depends on your foot..... :)

Id look like a bitch if I did so no!!!!!...

Thats why I was worried bout gas since it already gets 22mpg...I would love to finally have a ride that gets over 20

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Turbos increase your fuel economy drastically. I am an engineer with years of experience designing propulsion systems for ships. Every engine is fitted with a turbo to recovrr the waste heat from the exhaust and basically transfer the wasted energy back into your engine by increasing your cylinder air density by bumping the pressure up. You can tune it for efficiency and add an intercooler to further increase your air density for better combustion. Inter coolers are used to cool the air to again to increase air density so your combustion is improved. It all about density , pressure and temperature. Also, the more your engine is loaded the more efficient it runs.

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Not to question you're experience but performance oriented turbos and tunes will decrease fuel economy due to more fuel being added to the combustion chamber to take advantage of the increased air charge. I have actual real world experience with a turbo on this car and I have lost about 4mpg since I installed my turbo kit and got it tuned. I am sure there are turbo options that could improve mpg but they would be small and provide little performance increase for the cost. Turbos are however more fuel efficient than supercharger but that's a whole nother bag of worms.

yeah... fuel has to be added to that air, otherwise you will superheat the engine and melt the cylinders... you can't just add air and pump the same amount of fuel that it was using while it was stock.

KABLOOOOOOIE!!!!!!!!!!!!!!! Hyperdrive activated!!!!!!!!!!!! Turbo boosters activated!!!!!!!!!!! Flux capacitor!!!!!!!!!!!!!!!!! YAhhhhhhhhhhhoooooooooooooooooooooooooooo!!!






































Listen, just get what you want from your car. Like all people with 1st world problems, you can only have 2 of 3 things.... Performance, Reliability, Quality... Or something of that sort. lol

I think you are looking for Fast,Reliable,Cheap. Pick two.

I don't think anyone here will be adding a turbo to be more efficient. That would involve what, low compression pistons and a tiny snail so you can make the same HP more efficiently? Spend 10k to get 5mpg better? :bonk:

Uh, diesel engines are not the same as gasoline engines.

The more your engine is loaded the more efficient it runs, but a turbo only increases load when you want full power or because it's a restriction in the exhaust that needs more power to pump exhaust past. Adding a turbo to a gasoline drivetrain doesn't increase efficiency in most cases.

A turbo does not increase load, load is basically a brake acting on your engine like a hill when compared to flat ground. Most people think of load as functions of MAP, MAF, TEMP and RPM, this is more of system resistance. Load is more of an external driver. Never said diesel engine is the same as a gas engine. However, the principle is the same with respect to increasing energy whether its ignited by pressure or spark. You are effectively taking the wasted energy from your exhaust gasses to drive air, and pressure into your cylinders.

On the propulsion systems I have designed for ships, both gas and diesel propulsion always have dual turbos to increase efficiency by increasing the engine performance without having to increase the engine size, this is the driver for efficiency. The problem with efficiency on a car is the fuel mapping and the gearing. Like I was saying before your car has to be tuned correctly to maximize efficiency, as in running leaner. This can be done safely, but if not done correctly can lead to decreasing your longevity of your motor from heat issues.

You also have to select the right turbo for your car. If the OP is questioning if a turbo affects your gas mileage, the answer is yes. You can significantly increase your gas mileage with the correct size turbo and associated ancillary systems. Mostly your decrease in your mpg comes from your foot.

http://forums.pelicanparts.com/uploa...1080249046.gif

This curve is typical of a curve you will find for many compressor/turbine like applications. From centrifugal pumps to turbochargers. When designing a system, obviously you want to aim your system within the middle of the efficiency lines by adjusting turbo mass flow and pressure ratios. If your boosting your car like crazy 15psi your going to be wayy off the charts on the efficiency rating for your turbo and it just won't be worth it. But if you design your system appropriately your can gain a modest 2-4 mpg with a good turbo application. You won't melt your engine, you won't eat more gas, IF you tune your MAF, IF you adjust your gearing to compensate for the added torque. you can expect good mpg gains.

If you drive the exact same, with a turbo and without a turbo you will gain more mpg with a turbo even though your putting in more fuel. You know why? One reason is volumetric efficiency. Adding a turbo can increasse the volumetric efficiency up to 30-60%. Second, the system is not linear, just because you think you add 2 times the volume of air and you add 2 times the fuel does not mean you get 2 times the pressure after ignition.. the pressure is not linear as it is an isentropic gas situation. and varies as a power.

If you want efficiency, yes you can increase your mpg with a turbo.
If you want performance only? Yes it decreases your mpg. Why? because your foot is ass ramming the gas peddle...

It really depends what the OP is after, performance or fuel efficiency?

i'd like to see the turbo production engine that improves fuel economy. please show me because i chose the wrong car.

Some interesting turbo site wrt efficiency:


autospeed.com/cms/A_109931/article.html

caranddriver.com/columns/turbocharged-engines-to-the-rescue-why-it-will-be-different-this-time-around

fueleconomy.gov/feg/tech_engine_more.shtml

If you want a production engine that comes with a turbo to save you money check out these cool cars in the link below!!

autoguide.com/auto-news/2012/06/ten-turbocharged-vehicles-we-cant-wait-to-get-our-hands-on.html

I think you guys are on drugs if you think having a turbine wheel in your exhaust with an exducer the size of a pea is going to improve fuel economy at ANY point.

I am on drugs, but seriously turbos do increase efficiency, they even help scavenge the cylinder of dirty exhaust!... all in the way they are chosen/set-up. I'm done on this thread.. can't .. do.. anymore...

every single engine I have ever seen on ships diesel or gas or heavy fuel oil (HFO) have all been turbo charged. Why may you might ask? because they save money on fuel, especially when they spend millions to fuel their ships for they're long voyages.

Another GREAT GREAT site to learn about engines and all that cool stuff is: (its not just about diesel, it has gas engines, turbines etc.)

http://www.dieselduck.net/machine/in...l#.UQTnRGfRJHU

Real Case Study:
http://www.allpar.com/fix/holler/slant-six-turbo.html


But look at this site: It's a really easy read on turbos and shows how they work with the benefits (and.. also talks about efficiency).

http://www.popularmechanics.com/cars/how-to/4306310

I personally am not going for efficiency, I will be buying a badass turbo to maximize speeding tickets not my mpg.

Thought that was fords whole thing with the Eco boost engines.. Smaller more fuel efficient turbo engines..

Affect!!!

Uh, they are everywhere. Ford's ecoboost engines are an example of this. Chevy's 1.4t and VW's tdi as well. Why do you think when you chip an ecoboost or 1.4t you can gain like +50%hp? They tuned these cars for efficiency, not speed. They are designed correctly with tiny little efficient turbines. On cars like the wrx or evo, the engine and turbo is designed for speed. Making excess power.

This conversation is stupid. If you install a turbo on this car, it's because you want to go faster. Going faster will cost you mpg. How much? Supermassive shared his experience. That's the only data in this thread. Everything else is pretty much speculation and garbage.