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02-25-2008, 10:45 PM | #1 |
Scooby Newbie
Member#: 170532
Join Date: Jan 2008
Location: Oma - HA
Vehicle:07 2.5i obsidian black |
320 miles per tank
Ok normally 260mpt, so that is the background.
I put a Group A TBS A Blitx Nur Spec S Axel back (which by the way is a perfect fit on a 07 2.5i) I have a thule rack with all the attachments Stock everything else. The TBS got me 20 miles more per tank and more power. The exhaust pushed me from 280 to 320 mpt. The sound is straight authoritative, but still chill if you want to be low key. But the real question is: What is the speculative amount of horsepower gain. I was thinking 2 from the TBS and 5 from the exhaust. Anyone else have the same setup with the same results? If so I would like to hear from you. Peace
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02-26-2008, 01:41 AM | #2 |
Scooby Newbie
Member#: 117996
Join Date: Jun 2006
Chapter/Region:
BAIC
Location: NorCal
Vehicle:2002 WRX Wagon 5MT White |
i get 360mpt around town and up to 400mpt on the highway cruising w/ 55mph speed limit (doing 65 )
My Setup: Borla Headers Cobb Cat Back Rallitek 02 Sensor Extender Cobb Cold Air Intake |
02-26-2008, 02:00 AM | #3 |
Scooby Specialist
Member#: 159986
Join Date: Sep 2007
Chapter/Region:
AKIC
Location: YK Delta
Vehicle:2014 Jeep Patriot Blue-ish |
hey guys, what is a TBS? im new to subs, but ive never heard of a tbs, I used to work for Ford. Any ideas on how to get more mpt out of an older soob??? I have a 95 imp wgn. Any ideas much apprecitaed since im not gettin good milage at the moment. im getting about 15-16 in town with a 2.2. THanks again.
Gabe |
02-26-2008, 02:14 AM | #4 |
Scooby Specialist
Member#: 161832
Join Date: Oct 2007
Chapter/Region:
Tri-State
Location: PA
Vehicle:2000 Outback Limited Black |
tbs = throttle body spacer.
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02-26-2008, 09:17 AM | #5 | |
Scooby Specialist
Member#: 141189
Join Date: Feb 2007
Chapter/Region:
Tri-State
Location: Philadelphia
Vehicle:2007 2.5i (NBP) 2018 STI Limited (ISM) |
Quote:
As for the HP...you gained nothing but sound from your axleback because the pipes coming off the engine are still the same diameter and are not doing anything different. changing the tip does nothing. so if you want to claim 2hp (which is almost not even measurable because it falls within any +/- on a dyno) then go for it but i wouldn't believe for a second a standard axleback did anything. currently i have an injen SRI and a stromung catback and i drive my car like i stole it (as i say cars should be driven haha) and i see 300+ mpt on every fillup and that's pre-amber light coming on to tell me i need more fuel...i drove to toronto and back (not going to disclose speed but it was above the limit posted) and i was seeing ~26mpg...so i don't think it was your TBS that did that. |
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02-26-2008, 12:45 PM | #6 |
Scooby Specialist
Member#: 136144
Join Date: Dec 2006
Chapter/Region:
RMIC
Location: SLC, UT
Vehicle:2010 STi SWP |
Well, he claims the TBS got him an extra 1.25 mpg, which I suppose is believable, maybe. What gets me is, 2.5 mpg from an axleback? THAT is where I raise the BS flag.
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02-26-2008, 01:06 PM | #7 |
Scooby Specialist
Member#: 141189
Join Date: Feb 2007
Chapter/Region:
Tri-State
Location: Philadelphia
Vehicle:2007 2.5i (NBP) 2018 STI Limited (ISM) |
haha that is true i think i just looked at the total number and attributed it as coming from the TBS...but either way you look at it those 2 parts together are not going to increase your mpg that much if at all.
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02-26-2008, 01:11 PM | #8 |
Scooby Newbie
Member#: 117378
Join Date: Jun 2006
Chapter/Region:
Tri-State
Location: NJ
Vehicle:2006 2.5i Regal Blue Pearl |
I get 350 before my reserve light comes on, almost every time. I think we have a 2gallon reserve right guys? (+-.xx) So Im thinking my overal range is something like 400mpt. Does that sound like a tad too much?
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02-26-2008, 01:13 PM | #9 |
Scooby Guru
Member#: 44501
Join Date: Oct 2003
Chapter/Region:
NWIC
Location: Yeah, well, you know
Vehicle:that 's, like, your alternate facts, man. |
Please.. never post 'miles per tank' again in relation to fuel efficiency.. it means nothing unless you run your tank dry.
Miles per gallon... a 'tank' isn't a unit of measure. |
02-26-2008, 01:39 PM | #10 |
Scooby Specialist
Member#: 141189
Join Date: Feb 2007
Chapter/Region:
Tri-State
Location: Philadelphia
Vehicle:2007 2.5i (NBP) 2018 STI Limited (ISM) |
i don't know about a reserve but the light comes on with about 2gal left in the tank (i think it's 2gal) and the manual says i wont turn the light off till the tank has at least 4gal. I believe what it came down to is you can go ~40-50mi after the light comes on (at least i know i've done over 30miles after the light came on cause i was stuck on the QEW in Toronto with no way to get off lol)
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02-26-2008, 03:01 PM | #11 |
Scooby Newbie
Member#: 40674
Join Date: Jul 2003
Chapter/Region:
SCIC
Location: Los Angeles
Vehicle:94 Impreza wagon 1.8L + 657cc's |
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02-26-2008, 03:48 PM | #12 |
Scooby Newbie
Member#: 160318
Join Date: Sep 2007
Location: Scotia, NY
Vehicle:2006 Outback Sport |
The best "mpt" I've gotten was 410, all highway. That fill was 13.6 gallons and that works out to be 30.1mpg... not too shabby. In the winter I'll generally a little over 300 miles between fillings (same 13 gallons per fill). That works out to be about 23 mpg... again, not that bad, considering I let my car warm up a few minutes every morning and do much less highway driving.
I've also got a Group A TBS coupled with a Cosmo SRI. The SRI's been on for about a year, but the TBS just got put on about 6 weeks ago. I didn't do an ECU reset on either and noticed slightly less mpg with the SRI (probably due to the change in driving style more than anything else... that sound is incredible!); but I have noticed a consistent increase of 1.0-1.5mpg per tank every fill since I've had the TBS on there. Can't wait to see what it's like in the summer. |
02-26-2008, 04:18 PM | #13 | |
Scooby Newbie
Member#: 167703
Join Date: Dec 2007
Chapter/Region:
MWSOC
Location: MN
Vehicle:2005 '05 2.5RS 5MT '10 Forester X Limited |
Quote:
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02-26-2008, 05:22 PM | #14 |
Scooby Newbie
Member#: 165937
Join Date: Dec 2007
Chapter/Region:
RMIC
Location: Colorado, the ****ty part
Vehicle:2000 GM6 Blue |
So yeah this one time I got 200 mpt and I was like wtf?!?! Then I realized that my tank was still half full. OMG!!
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02-26-2008, 07:24 PM | #15 | ||||
Scooby Guru
Member#: 120
Join Date: Jul 1999
Chapter/Region:
AKIC
Location: Where the Navy sends me...
Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
Quote:
Quote:
Quote:
Quote:
Pat Olsen |
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02-26-2008, 07:33 PM | #16 |
Scooby Specialist
Member#: 68510
Join Date: Aug 2004
Chapter/Region:
Tri-State
Location: Pittston / State College
Vehicle:Last year of the RS Swirlmark-black on..black |
I have borla headers and a 2.25" stromung catback. i average around 25mpg driving spiritedly. No tbs though. Ill have to look into that.
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02-26-2008, 10:39 PM | #17 |
Scooby Newbie
Member#: 146216
Join Date: Apr 2007
Chapter/Region:
South East
Location: Birmingham, AL
Vehicle:2007 Impreza 2.5i SE Newport Blue Metallic |
I normally get 26-27mpg combined cycle with my highest avg fuel economy using Shell gasolines. Just FYI
and yes, mpt = terrible. I've never had the balls to drive my car to where the gas light came on, I always chicken out at the 12.7 gallons used mark when it hits the last line on E. |
02-26-2008, 11:24 PM | #18 |
Scooby Newbie
Member#: 117996
Join Date: Jun 2006
Chapter/Region:
BAIC
Location: NorCal
Vehicle:2002 WRX Wagon 5MT White |
if im not mistaken, a tank and a gallon are both units of liquid measure...
if the tank is 15 gallons, then 400mpt = 400miles/15gal = 26.7mpg yet i do find it hard to believe that everyone runs their tank dry when i used mpt i was considering the fact that i usually wait for the light to turn on or damn close to that before i fill up... my .02 (Yes mpg is better) |
02-26-2008, 11:32 PM | #19 |
Scooby Guru
Member#: 115154
Join Date: May 2006
Chapter/Region:
MWSOC
Location: NYC
Vehicle:2005 Outback XT White on grey |
^^^ Simple, they don't. The "E" on most tanks usually has about 1/8th or so of the tank still in reserve so schmucks can have enough gas to get to the closest station.
Get a full tank, drive around, note mileage, fill up tank to full again, note how many gallons it took. Divide mileage by gallons and you get MPG. One "empty" tank reading can vary as much as a 1.5 gallons from another "empty" reading. Of course you'll think you got more mileage. BTW, its not good for the fuel pump to keep the tank running constantly to dry. The gasoline actually helps it stay cool. |
02-26-2008, 11:53 PM | #20 |
Scooby Specialist
Member#: 112986
Join Date: Apr 2006
Chapter/Region:
NWIC
Location: Camano Island
Vehicle:N/A Cam'd & Cornfed DOM TUNED 06 Impreza |
Well you guys are crazy, I get about 19 miles per if I really pull my foot out of the gas I'll get around 23, thats the highest I have received.
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02-27-2008, 08:19 AM | #21 | |
Scooby Newbie
Member#: 64646
Join Date: Jun 2004
Location: Northern Virginia
Vehicle:1995 Legacy wagon Green |
Quote:
Once you do that, consider getting a higher-flow intake, including something like a K&N air filter. A monster sound system will rob a couple of horsepower (at full volume, anyway) and add considerable weight, so keep the sound system simple if you want the best mileage. Date skinnier women. If winter gasoline is sold in your region, understand that you will get worse gas mileage with winter gasoline. I have a 1995 Legacy wagon (manual trans and 2.2 engine) and regularly get 24-26 mpg in typical driving. I've gotten as high as 30 mpg on the highway but I usually get 25 mpg for a week of commuting, which is a mix of a little stop-and-go and some highway driving. --Bob |
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02-27-2008, 08:36 AM | #22 |
Scooby Newbie
Member#: 172732
Join Date: Feb 2008
Location: Nova Scotia, Canada
Vehicle:2006 Impreza N/A Silver |
Agree that Miles Per Tank or relying on the fuel gauge as a measure are both highly inaccurate and unscientific. Also running the gas tank dry will damage the fuel pump (gasoline is used to lubricate and cool the in-tank pump). Idling or warming the engine is also a waste of fuel and harmful to the engine.
The only way to measure accurate MPG is to fill up. Drive a known route at a known time of day until the tank is getting low. Fill up (ideally same pump, same time of day, same ambient temperature and air pressure, car parked same place, same payload in car...) reset your trip meter and/or take note of the odometer reading. Drive the same known route, same time of day, same traffic etc... until the tank is getting low again. Refill the tank (all same as above). Take note of the gallons needed to fill and how many miles driven since last fill. Miles divided by Gallons = MPG. Repeat all steps and average the results over time. |
02-27-2008, 10:50 AM | #23 |
Scooby Guru
Member#: 141373
Join Date: Feb 2007
Chapter/Region:
E. Canada
Location: Quebec, QC
Vehicle:2022 Crosstrek Sport 6MT |
..not miles per tank again..
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02-27-2008, 11:01 AM | #24 | ||
Scooby Newbie
Member#: 167703
Join Date: Dec 2007
Chapter/Region:
MWSOC
Location: MN
Vehicle:2005 '05 2.5RS 5MT '10 Forester X Limited |
Quote:
Quote:
When you first restart after resetting the ECU you'll be in OL for a few minutes (likely varies between models/conditions for me personally it's 2-3 minutes). During this time the ECU isn't really learning anything (check LTFT with logging). Once it finally transitions to CL and tries to hit lambda the AFR will bounce around for a bit as it balances MAFv / AFR readings. Keep in mind this learning encompasses more than modifications to the car, LTFT's also attempt to compensate for aging components and sensor degradation as best as possible. Why not just start driving right away? The first time I reset and drove right away without any learning the car died at the first stop light. Again, it is an opinion statement, howevever I'd like to see supported justifications for not wanting to let the ECU relearn. |
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02-27-2008, 04:28 PM | #25 | |
Scooby Guru
Member#: 115154
Join Date: May 2006
Chapter/Region:
MWSOC
Location: NYC
Vehicle:2005 Outback XT White on grey |
Quote:
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