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Forced Induction Turbo, Supercharger, Methanol, Nitrous


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Old 01-26-2013, 02:14 AM   #1
beesmiff07
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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.
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Old 01-26-2013, 02:18 AM   #2
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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.
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Old 01-26-2013, 02:18 AM   #3
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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.
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Old 01-26-2013, 02:37 AM   #4
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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

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Old 01-26-2013, 03:00 AM   #5
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Into consideration
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Old 01-26-2013, 03:03 AM   #6
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Into consideration
good lookin out lol
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Old 01-26-2013, 10:26 AM   #7
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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.
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Old 01-26-2013, 10:40 AM   #8
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I'd say you might drop from 29 to 24mpg, depending how you drive it, turbo size, tune, etc.
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Old 01-26-2013, 11:08 AM   #9
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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
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Old 01-26-2013, 11:12 AM   #10
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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?
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Old 01-26-2013, 11:12 AM   #11
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Old 01-26-2013, 11:25 AM   #12
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Financially this question is very ironic. Don't worry about it.
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Old 01-26-2013, 11:30 AM   #13
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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…

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Old 01-26-2013, 11:44 AM   #14
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Originally Posted by Bristecom View Post
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.
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.
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