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06-20-2008, 02:58 PM
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#1 (permalink)
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Ninja Matsume
Join Date: Feb 2002
Location: Upstate NY
Posts: 3,629
Car: 1991 Acura Integra GS
Mods:
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Bad Gas Mileage in my 99 si!
When I first picked up the car with 120k on the clock it was getting in the 30s on the highway. Now I average around 23mpg on a full tank. Half highway/Half city. I've picked up new NGK plugs, wires, cap and rotor. Also put in a new fuel filter and a new converter with an apex-i ws2 exhaust. No change at all in mileage. What else is there to look for?????
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06-20-2008, 03:55 PM
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#2 (permalink)
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SH Black Diamond
Join Date: Jun 2008
Location: seventh circle of hell
Posts: 438
Car: 97 Civic Ex
Mods: vtac boost controller, 2 bored out kanooter valves, flux capacitor(1.21 jigawatts), and synthetic blinker fluid
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bad gas gauge??  had the same problem with my old si belive or not, i couldnt figure it out either. replaced all kinds of shit and it did nothing
__________________
What sick ridiculous puppets we are, and what gross little stage we dance on. What fun we have dancing and fucking. Not a care in the world. Not knowing that we are nothing. We are not what was intended.
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06-20-2008, 04:39 PM
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#3 (permalink)
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Black Cloud
Join Date: Sep 2005
Location: Plymouth Meeting Pa
Posts: 13,628
Car: 1989 240sx
Mods: SR20DET,3" exhaust from the turbo, AFC, Greddy RS B.O.V., CP pistons, greddy head gasket, nismo clutch, tie rods, springs, shocks, vlsd,etc
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if you put bolt-ons like i/h/e on the car you will get worse gas mileage during accelleration. but the same if not slightly better than stock during highway cruising.
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06-21-2008, 09:31 AM
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#4 (permalink)
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Ninja Matsume
Join Date: Feb 2002
Location: Upstate NY
Posts: 3,629
Car: 1991 Acura Integra GS
Mods:
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Only mod so far is the apex ws that I just installed. Other than that its bone stock. Seems like I got worse mileage now that the exhaust is on.
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06-21-2008, 10:26 AM
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#5 (permalink)
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Black Cloud
Join Date: Sep 2005
Location: Plymouth Meeting Pa
Posts: 13,628
Car: 1989 240sx
Mods: SR20DET,3" exhaust from the turbo, AFC, Greddy RS B.O.V., CP pistons, greddy head gasket, nismo clutch, tie rods, springs, shocks, vlsd,etc
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because you're pressing down more on the gas since you like the sound of your exhaust ;-)
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06-21-2008, 10:58 AM
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#6 (permalink)
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Ninja Matsume
Join Date: Feb 2002
Location: Upstate NY
Posts: 3,629
Car: 1991 Acura Integra GS
Mods:
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Lol its the ws2. Can't even tell I have an aftermarket exhaust
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06-23-2008, 11:50 PM
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#7 (permalink)
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Midnight Racer
Join Date: Dec 2006
Posts: 1,152
Car: i have 2... can you guess...
Mods: bone stock baby !!!.... right??
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Quote:
Originally Posted by 91Integracer
Lol its the ws2. Can't even tell I have an aftermarket exhaust
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maybe its because im siphoning the gas out from your car in the middle of the night like a ninja !!!! SIPHONING gases since 19XX!!!!! FTW  |
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06-24-2008, 12:34 AM
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#8 (permalink)
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SuperHonda Member
Join Date: Mar 2008
Posts: 108
Car:
Mods:
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check your plugs and your filter!@
__________________
2002 Honda Civic Si Greddy Turbo'd
1989 BMW 328ci SR20DET Powered
1972 Honda CB350 Supersport
1971 Mercedes Benz 300sel 6.3 Monster
1989 Dodge Colt/Mitsubishi Mirage Turbo 4g63 Turbo'd -- goodbye, you will be missed 
www.thetunersource.com
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07-09-2008, 09:25 AM
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#9 (permalink)
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Noob
Join Date: Jul 2008
Location: Wisconsin
Posts: 22
Car: 1992 HatchBack
Mods: To Many
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stop racing/redlining
__________________
When you still concentrate on if the cops are going to catch you while racing or not, your not going fast enough
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07-14-2008, 03:31 PM
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#10 (permalink)
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SH Black Diamond
Join Date: Nov 2002
Location: NW Ohio
Posts: 470
Car: 2002 Honda Civic Si
Mods:
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Quote:
Originally Posted by 91Integracer
When I first picked up the car with 120k on the clock it was getting in the 30s on the highway. Now I average around 23mpg on a full tank. Half highway/Half city. I've picked up new NGK plugs, wires, cap and rotor. Also put in a new fuel filter and a new converter with an apex-i ws2 exhaust. No change at all in mileage. What else is there to look for?????
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30 on the highway, and 23 average is talking apples to oranges. Do you calculate mileage, and always fillup when you get gas writing down the #s etc?
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07-14-2008, 06:08 PM
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#11 (permalink)
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Noob
Join Date: Nov 2007
Location: Carmel NY
Posts: 53
Car: 92 cx aka fake si
Mods: CAI/H/E d16z6 swap soon to get a b16...
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Tire pressure, alignment, and overall driving style also plays a key role.
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07-14-2008, 08:51 PM
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#12 (permalink)
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Brand Spanking Newbie
Join Date: May 2008
Posts: 4
Car:
Mods:
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Basically slow down! We had a 99 SI for a few years and had terrible mileage above 70 mph on the highway but OK mileage below that. No mods were done.
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07-15-2008, 05:40 PM
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#13 (permalink)
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SH Black Diamond
Join Date: Nov 2007
Location: High Point, NC
Posts: 456
Car: 97 honda civic
Mods: non yet
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get a tune up.
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07-16-2008, 10:07 AM
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#14 (permalink)
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Noob
Join Date: Aug 2006
Posts: 10
Car:
Mods:
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It's that damn b16 tranny. I'll be needing my si for highway driving for my new job, and it sucks on the highway, sucking gas at 4.5k rpm at 80mph.
I was thinking about swapping the LS tranny in since it has longer gears.
But just gas mileage, clean your intake filter. And like redpanda said, check your tire pressure and alignment
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07-17-2008, 09:59 AM
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#15 (permalink)
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Noob
Join Date: Jun 2008
Location: On Earth
Posts: 64
Car: 1991 Accord Ex
Mods: Straight up Stock Man!!!!!!
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Bad muffler bearing.........lol I had to say it!!!! There could be many different issue to cause bad gas mil
__________________
1991 Honda Accord LX: Work Car
2006 Ford F-150: Fun Truck
2006 Corvett: Turbocharged Fun- 890hp
2007 Chevy Cobalt SS/SC: Sold 
1998 Honda Civic Hatch: Project Go FAST!!!!! 
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