Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Archives > NASIOC Archives > General Forum Archive

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
 
 
Thread Tools Display Modes
Old 06-20-2000, 05:41 PM   #1
ARG
Scooby Specialist
 
Member#: 386
Join Date: Oct 1999
Chapter/Region: SCIC
Location: Upstairs in the bedroom
Vehicle:
1999 Impreza RS-S
Rally Blue & Supercharged

Talking Gas mileage with supercharger!! 305 miles to a tank of gas.

I filled my 99 RS with 91 super unleaded to check my mileage. Mostly city driving with the A/C on. About 30% freeway. I got 305 miles to the tank. I pretty jazzed about it. EVERYONE told me that superchargers are parasites and suck horsepower out of an engine. Obviously not. If such were true, I should have received worse mileage. So, what are you turbo guys getting???????
* Registered users of the site do not see these ads.
ARG is offline  
Sponsored Links
* Registered users of the site do not see these ads.
Old 06-20-2000, 05:56 PM   #2
Tim Prudence
Scooby Specialist
 
Member#: 216
Join Date: Aug 1999
Location: san diego, ca USA
Post

Usually about 240 miles. Not that good. Only 5.5 psi non-intercooled.

But then again, I never got 300 miles out of a tank even before the charger went on...

[This message has been edited by Tim Prudence (edited June 20, 2000).]
Tim Prudence is offline  
Old 06-20-2000, 05:58 PM   #3
KooshDogg
Scooby Newbie
 
Member#: 134
Join Date: Aug 1999
Location: Washington, DC, USA
Post

um, hehe, my understanding of superchargers is that they DO increase parasitic drag on the engine, but the increase is negligible compared to the power gained... and obviously, if you're applying less throttle (and getting comparable power at lower RPM's) you'll get better gas mileage (assuming you're not racing that is

[This message has been edited by KooshDogg (edited June 20, 2000).]
KooshDogg is offline  
Old 06-20-2000, 06:01 PM   #4
8Complex

Moderator
 
Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
Vehicle:
16 WRX (white)
04 FXT (red)

Post

I dunno... I've never gotten better then 240/tank on my N/A Impreza around town.

I think it's time for a tune up/ECU reset.
8Complex is offline  
Old 06-20-2000, 08:17 PM   #5
ImprezaRS dot com
over boosted again
Moderator
 
Member#: 1458
Join Date: May 2000
Chapter/Region: RMIC
Location: Colorado Springs CO USA
Vehicle:
2017 WRX Limited
15 Forester XT, 21 Ascent

Post

My mileage is improving over time, as the ECU relearns my airflow with new intake.

In the past 4 weeks since I installed my new design and reset the ECU, I have seen city mileage go from 18 or 19mpg back up to the 23mpg I was getting when I bought my RS! I get over 28mpg at 75mph on the highway.

I also see much less soot sticking to my rear bumper near the tailpipes of the Stromung on my MY00.

Larry "my $0.02 worth has nothing to do with SC mileage" Ganz
www.ImprezaRS.com
ImprezaRS dot com is offline  
Old 06-20-2000, 10:36 PM   #6
CNC84
Scooby Newbie
 
Member#: 642
Join Date: Dec 1999
Location: AUSTIN, TX
Thumbs up

You sure they didn't stick a bigger gas tank in there with the S/C J/K that's really great mileage.
CNC84 is offline  
Old 06-20-2000, 11:44 PM   #7
shiv
Scooby Specialist
 
Member#: 607
Join Date: Dec 1999
Location: SF Bay Area, CA
Post

SCs are indeed parastic. But in the case of sc kits with bypasses, they are only parasitic when they are "engaged" (i.e. under moderate to high load). With a 230hp twin screw autorotor'd system, you're probably loosing 20 or so hp in parasitic losses. But under low load/cruise conditions, power loss and reductions in fuel economy should be insignificant.

As for fuel economy, my turbo car averages between 20-30mpg, depending on driving conditions. This means, with a 12 gallon fill up, a tank will give me between 240 and 360 miles.

shiv
shiv is offline  
Old 06-21-2000, 12:25 AM   #8
stuckat1
Scooby Newbie
 
Member#: 917
Join Date: Feb 2000
Lightbulb

I remember in an article in Autoweek, a couple years back, in which TRD claimed that their super charger for the 4runner actually increases mpg by 1. This was due to the increase in torque at the lower rpm.

stuckat1 is offline  
Old 06-21-2000, 01:45 AM   #9
ndmorespd
Scooby Specialist
 
Member#: 1657
Join Date: Jun 2000
Chapter/Region: BAIC
Location: Kingstowne, Va. USA
Vehicle:
2k RSish
BRP

Angry

Ok, well I only have two mods done to my Impreza... Yoko A520's (SCCA Solo II Street Tire) and my lead (or worse) foot... I have yet to get better than 22 mpg, and that was without ac on the way to San Francisco for a day...

Maybe the latter mod is just too much...

Mike
ndmorespd is offline  
Old 06-21-2000, 06:56 AM   #10
MattC
Scooby Specialist
 
Member#: 158
Join Date: Aug 1999
Chapter/Region: NESIC
Location: CT
Vehicle:
2011 STi
PBP 1999 2.5RS RBP

Post

My turbo kit increased my MPG. Before the Turbo my best was 30mpg. After the turbo, on the way to Carlisle PA, I got 415miles on 12.5g! That comes out to a bit over 32mpg. On the highway we were seeing upwards of 36mpg. Of course when I really get on it I can almost watch the gauge go down. But, with the turbo I have never had less than 23mpg. But right now I just want my car back

MattC
Minnam Stage II@8psi
MattC is offline  
Old 06-21-2000, 07:27 AM   #11
edekker
Scooby Newbie
 
Member#: 143
Join Date: Aug 1999
Location: Kanata, ON, Canada
Vehicle:
1999 Impreza 2.5RS
Supercharged - and STOLEN

Post

On my way to Rimmer I was averaging 27mpg. On my way back - 25mpg. I had been driving fast both ways - up to 90mph frequently.

Ed. [Eaton blower @ 7lbs-boost]
edekker is offline  
Old 06-21-2000, 09:30 AM   #12
frog
Scooby Newbie
 
Member#: 1516
Join Date: May 2000
Location: Sacramento, CA, USA
Vehicle:
1999 Impreza 2.5RS
Black

Post

I've got a 99RS with only a K&N drop in, gasket for second air box, and the silencer removed and after 21k miles I still get the same 26mpg I got when I bought it. I do about 1/2 city 1/2 highway and I've never seen more than 2mpg either way. I'm just hoping I can use the AFC I'm getting to put back the miles taken by the new JC Sports intake I'm getting.

Oh yeah, I got worse mileage when I used Chevron 92 octane gas than my normal Chevron 87. Try it out. The engine seems to run better too.

[This message has been edited by frog (edited June 21, 2000).]
frog is offline  
Old 06-21-2000, 09:41 AM   #13
Delverius
Scooby Newbie
 
Member#: 1122
Join Date: Mar 2000
Chapter/Region: NWIC
Location: Nampa, Idaho - USA
Vehicle:
2000 2.5RS NA
Blueridge Dirty

Thumbs down

I only get about 300 to the tank
But I drag the $hit out of my car. I race from every light I stop at. I do about 30% highway, the rest city. My average city speed is 50. I can't help it ... the car does that or I have an anchor tied to my foot. I'm running Bridgestone RE730, Weapon*R Intake and Unorthodox Pulley. Just my 2 cents...

-Del
Delverius is offline  
Old 06-21-2000, 10:07 AM   #14
Geoff
Scooby Specialist
 
Member#: 592
Join Date: Dec 1999
Chapter/Region: TXIC
Location: P-Ville, Texas
Vehicle:
'11 X5 xDrive35i
'09 135i 6MT/'15 GTI 6MT

Post

Right now I'm running SFC (Sans-Fuel Computer) and getting the Apex'i S-AFC installed Friday, so I'm only running 4psi right now and getting ~250 miles to a tank full of 93. Hopefully the S-AFC will help with that...and we're gonna add more boost at Performance Subaru.

When I was running the Hyper-R with 7psi of boost, I made it from New Orleans to Houston on one tank (350 miles!) - this while playing with a Mustang GT 5.0 on I-10 for a bit.

Prior to forced induction, my best was 372 miles to the tank with one passenger and the car full of luggage and stuff on a drive up to Canada.
Geoff is offline  
Old 06-22-2000, 12:31 AM   #15
Tim K.
Scooby Specialist
 
Member#: 214
Join Date: Aug 1999
Location: Sumter, SC
Vehicle:
2014 Massey Ferguson
Red

Post

My car is bone stock and driven on the freeway or open road most of the time. I generally get about 275 miles per fill-up (about 13.5~14 gallons per fill-up). When my wife drives my car, she stretches the mileage out to 27~28 mpg.

Please do not infer my gas mileage is a reflection of how fast I drive. It is well known that my car cannot exceed the 70 mph speed limit. I swear!
Tim K. is offline  
Old 06-22-2000, 12:39 AM   #16
Matt Monson
Scooby Guru
 
Member#: 832
Join Date: Jan 2000
Chapter/Region: RMIC
Location: Teh Ghetto Garage, CO
Vehicle:
99 2.5RS, '85 911
'73 914 and 2012 BRZ

Post

I have a NA MY00 and thought I was getting bac mileage getting 24mpg hwy and 20 city. I guess I should be one happy camper.
Matt Monson is offline  
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Hyundai Santa Fe diesel gets 50MPG and goes 1,100 miles on one tank of gas! MattDell Non-Subaru News & Rumors 18 12-15-2006 12:34 AM
The ability to go XXX miles on one tank of gas wyn525i Off-Topic 55 10-17-2006 01:57 AM
How many miles on full tank of gas? eric94501 Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) 86 10-16-2006 10:26 AM
Most miles on a tank of gas? (WRX) P03w Off-Topic 39 04-10-2004 10:18 AM
i got 377.6 miles on a tank of gas... sanders General Forum Archive 3 10-15-2000 10:12 PM

All times are GMT -4. The time now is 07:50 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.