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Old 10-15-2000, 07:20 PM   #1
yebokmj
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Question Gas Milage with a Turbo?

I was at the pump tonight filling up and I started to wonder what kind of gas milage will I be getting one I get my turbo in. I plan to in the beging run 5psi. I drive with a pretty heavy foot and let the rpms get up there. What are you guys that have turbo's getting?
Joshua
MY98 RS
Subaru Salesman
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Old 10-15-2000, 07:39 PM   #2
Geoff
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I just got back from a road trip today...on the road, AC on, doing ~80-95+ the whole way, I averaged about 21mpg. In city driving, I usually average about 18mpg. Not BAD, not great. I used to get 27mpg prior to the turbo...but the trips weren't nearly as fun.
-Geoff
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Old 10-15-2000, 08:14 PM   #3
ImprezaL
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I remember Mike Jerry said his MPG actually went UP after putting in his turbo- ask him!
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Old 10-15-2000, 09:13 PM   #4
Chung
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around 200-220 miles a tank(13-14 gallons) Too lazy to calculate the MPG.

* JC sports Turbo Kit 7psi
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Old 10-15-2000, 09:20 PM   #5
Mr. Jones
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Talking

Yeah, he told me that we went from around 26-27 to around 28-9 or so. I assume that's highway at around 75-80mph or so. (slower than I drive on the highway...damn California roots!)
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Old 10-15-2000, 09:21 PM   #6
MattC
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Ouch, mine most definitely went up. I used to get about 25mpg. Now I have seen upwards of 30mpg. Shiv has said that he averages 31mpg. I guess it has a lot to do w/ your driving style.

MattC
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Old 10-15-2000, 10:11 PM   #7
george
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Damn. In that case I can't wait to get a turbo.
But... that supercharger is really tempting.
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Old 10-16-2000, 08:10 AM   #8
Sean McElderry
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20-22mpg in the city. 30mpg on the highway.

This is running 8psi of boost on a Minnam Stage II/TEC-II combo in a MY00 RS.

Sean
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Old 10-16-2000, 08:23 AM   #9
Geoff
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How can adding a turbo increase your fuel economy? All things being equal, running a turbo requires that you pump more fuel into the engine (under boost) to get a proper ignition with the added compressed air. Wouldn't adding a larger fuel pump/injectors also equate to more fuel consumption?

The best my car ever saw NA was 380 miles to its tank. Now, on the highway, I'll see about 300; with city driving, about 240-250. Don't tell me the Outback Sport is that much heavier.. If there's some voodoo magic you guys are working on your cars to get better fuel economy with the turbos, let's have it!
-Geoff

[This message has been edited by SabreLion (edited October 16, 2000).]
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Old 10-16-2000, 08:39 AM   #10
Kevin Thomas
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Have a Nice Day?

SabreLion,

You took the words right out of my mouth as far as what gas mileage you are getting. I am getting almost exactly the same gas mileage as you. It's really starting to dig into my pockets nowadays. It could be worse.
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Old 10-16-2000, 08:57 AM   #11
Jude DeMeis
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I agree about the poor mileage as well. My 2.2L wagon used to get around 23mpg in mixed use and at 75-80mph highway cruise it would get around 26. Now with WRX STi engine/tranny it gets around 18 in mixed use and 22-24 on the highway. I've never gotten anything close to 30mpg in any Subaru. But maybe if you cruised 55mph on the highway...
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Old 10-16-2000, 09:34 AM   #12
Tim Prudence
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I usually average around 18 mpg with city driving. On the highway I end up getting over 20 mpg, usually around 23 mpg and I usually drive 80 mph.
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Old 10-16-2000, 01:01 PM   #13
markus
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If you guys recall from this last installment of the TEC-II in SCC, Shiv specifically states that at lower engine load the VE table was tuned to provide fuel economy. Therefore, when you're takin' it easy on the gas pedal, it provides you with fuel economy instead of performance. Inversely, if your diggin' into the boost a little more, I guarantee you will be using more fuel.

I guess we now know who has the heavy right foot.

Cheers,
MB
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Old 10-16-2000, 03:18 PM   #14
shiv
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I wouldn't say that I "average" 31mpg I only see number like that when steady state cruising on the highway at 75mph. Around town and with a heavy right foot, I can get anything from 18 to 24mpg. Yes, I've tund low load (50-70kPa) and cruise speeds (3000-4000rpm) to run lean and with a good deal of spark advance.

Shiv
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Old 10-16-2000, 03:34 PM   #15
Kwez
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rimmer, @ 7psi. (RRFPR, WRX fuel pump)

mainly hiway:

around 10.2L/100km (real sorry about metric, dunno how to translate)

after 2.5" catback + clutch:
1st fill-up: 14L/100km
lately: 11L/100km
(hey, I knew there was a good side to that darn Check Engine light ;-)

(anyone can translate for me .. please?)
Philippe
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Old 10-16-2000, 03:58 PM   #16
Sean McElderry
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Philippe-

Translation:

10.2L/100km = 2.69g/62.14mi = 23.1mpg
11.0L/100km = 2.91g/62.14mi = 21.4mpg
14.0L/100km = 3.70g/62.14mi = 16.8mpg

Sean
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Old 10-16-2000, 11:07 PM   #17
ImprezaRS dot com
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Well, I just finished my turbo installation today, topped off the tank and got 16.8 mpg while driving hard to tune the AFC and fuel pressure regulator.

That's probably as bad as it could ever get...

Larry www.ImprezaRS.com
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Old 10-17-2000, 12:38 AM   #18
IMPRZIV
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SabreLion,

My Guess is that it is all in the tuning of the cars. Especially these guys running TEC II systems. The Factory still tunes down the middle line, with an eye on emissions above all else. If Shiv is getting that kind of Mileage, I don't know what else would explain it....

~Scott
Rally Blue MY99
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Old 10-17-2000, 08:42 AM   #19
63Alpine
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I really am not trying to be rude here but...You are going to shell out thousands of dollars on a turbo and you are worried about fuel mileage?

Just pump it in and drive like mad, there are plenty of dead dinosaurs left to burn.
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Old 10-17-2000, 03:16 PM   #20
Kwez
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thx Sean
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Old 10-18-2000, 12:20 AM   #21
yebokmj
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I am not conserned about gas milage just curious. I keep track of how many miles I get for each fill up because I never like the idea of my car bottom feeding.
Joshua
MY98 RS
Subaru Salesman
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