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Depriesticles · 09-11-2009, 03:27 PM

I just finished my b18a1 swap in my 90 hatch and it runs and drives great...but I am not sure if I did something wrong because of the gas mileage I am getting. I had almost a full tank when I did the swap, and I have driven it for 2 days now and I am on empty. I knew my gas mileage would drop some, but this much?

Its a stock b18a1 out of a 91 teg, and I think the trans must be a b16 because of the uber short gears. Hell...I am revved to 3600 rpms going 60 mph...so that would probably account for some of the loss, but can someone tell me if this is normal for these motors? I thought my mpg would be somewhere around 23-25, but it seems I am getting closer to 12-15. Any solutions?

DeathInACRX · 09-11-2009, 09:32 PM

I have the same problem and it is just a sacrafic I had to take for the little bump in power. It does suck though because the D16A6 I had got 320 miles to the tank(9.5 gallons used

), and now with the B18 so far I've squeed out 172 miles on 8 gallons. I should do a proper mileage test and carry a 2 gallon tank in the trunk and drive it until its almost dry. Im hoping that I can get at least 220 miles to the tank buy driving like a grandpa but thats hard to do,and the 17"s on the car doesn't help either. peace

91_stylin_civic · 09-11-2009, 10:12 PM

Somethings not right im getting 290 miles on just under 9 gallons and im running a b16a in a 91 hatchback that is anything but babied

invisibledemon · 09-16-2009, 05:53 PM

yeah, if you guys are getting gas mileage that shitty, you should have it looked at.
i have never had a honda d or b series get under 30mpg.

unless you are driving like its a race car, because its not.

sitting that high wouldnt bring you down that much.
ditch that tranny for a stock ls trans.

take it to a mechanic that can properly diag it.

D15Beater · 09-17-2009, 01:00 AM

Running the Pr4 ecu without the fuel purge solenoid found on the integra's firewall will consume mucho fuel, run a Pm6 and itll run better.

D16SiHatch · 09-19-2009, 02:36 AM

do NOT run the ls on a pm6. keep the ecu you have, it is meant to run the ls. end of story. something is majorly out of wack if you are getting gas mileage that terrible.

Archangl · 10-05-2009, 12:04 AM

The funny thing is the samething is happening to me. I have b18b1 with a b16 tranny and I get about 160 to the tank.

Gnarphantom · 10-13-2009, 06:08 PM

I had an LS in my CRX with the LS tranny and got 39.7 to the gallon on average, last weekend I swapped in a B16 tranny instead and have not noticed a difference.

Archangl · 10-29-2009, 05:22 PM

what year is the engine?

crxprojectcar · 10-29-2009, 05:47 PM

yea somthings wrong major .. calculate your milege fill your tank to the complete top set your trip counter ... (make sure your wheels and not larger or smaller than stock if you havent fixed your speedo to the wheel size that is ) ... and drive like normal once your almost emty fill all the way back up ... and divide the miles driven by the amount of the last fill up .. and if your not pushing high 20s then you got somthin WAY wrong ... my b16a with y1 trans (low gears lol) im gettin 30-33 mpg and i drive that shit in vtec half the damn time

kidkg24 · 11-01-2009, 06:11 PM

well all this talk, and no answers. Well you can probley fix your problem with some little basic changes. Like take the plugs out, and replace them. Change the fuel filter if you didn't change it yet it prob was never changed, check dist. timing.

my car was getting like 16 miles to the gallon, stock when i bought it at a used dealer. I started at the fuel system. when i changed the plugs, oil, and rotor my gas milage became amazing. lol

09-11-2009, 03:27 PM	#1
Depriesticles Member Join Date: Aug 2008 Location: Snohomish, WA Posts: 39 iTrader: 0 / 0% Ride: 1990 Honda Civic DX "The Snackbox" Rep Power: 4	b18a1 swap gas mileage problem? I just finished my b18a1 swap in my 90 hatch and it runs and drives great...but I am not sure if I did something wrong because of the gas mileage I am getting. I had almost a full tank when I did the swap, and I have driven it for 2 days now and I am on empty. I knew my gas mileage would drop some, but this much? Its a stock b18a1 out of a 91 teg, and I think the trans must be a b16 because of the uber short gears. Hell...I am revved to 3600 rpms going 60 mph...so that would probably account for some of the loss, but can someone tell me if this is normal for these motors? I thought my mpg would be somewhere around 23-25, but it seems I am getting closer to 12-15. Any solutions?

09-11-2009, 09:32 PM	#2
DeathInACRX Junior Member Join Date: Jul 2008 Posts: 15 iTrader: 0 / 0% Rep Power: 3	I have the same problem and it is just a sacrafic I had to take for the little bump in power. It does suck though because the D16A6 I had got 320 miles to the tank(9.5 gallons used), and now with the B18 so far I've squeed out 172 miles on 8 gallons. I should do a proper mileage test and carry a 2 gallon tank in the trunk and drive it until its almost dry. Im hoping that I can get at least 220 miles to the tank buy driving like a grandpa but thats hard to do,and the 17"s on the car doesn't help either. peace

09-16-2009, 05:53 PM	#4
invisibledemon Bored Join Date: Jan 2007 Location: Tn Age: 23 Posts: 2,988 iTrader: 0 / 0% Ride: I walk on my hands Rep Power: 213	yeah, if you guys are getting gas mileage that shitty, you should have it looked at. i have never had a honda d or b series get under 30mpg. unless you are driving like its a race car, because its not. sitting that high wouldnt bring you down that much. ditch that tranny for a stock ls trans. take it to a mechanic that can properly diag it. __________________ I had an argument with a girl I know. She was saying how its unfair that if a guy fucks a different girl every week, he's a legend, but if a girl fucks just two guys in a year, she's a slut. So in response I told her that if a key opens lots of locks, then its a master key. But if a lock is open by lots of keys, then its a shitty lock. That shut her up.

09-19-2009, 02:36 AM	#6
D16SiHatch Senior Member Join Date: Sep 2007 Posts: 795 iTrader: 0 / 0% Rep Power: 33	do NOT run the ls on a pm6. keep the ecu you have, it is meant to run the ls. end of story. something is majorly out of wack if you are getting gas mileage that terrible. __________________ 91 Civic Si b18b1, I/H/E, 6000k HID kit, 94 teg cluster Parting mustang out to buy another civic

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09-11-2009, 10:12 PM	#3
91_stylin_civic Senior Member Join Date: Oct 2008 Location: New Jersey Age: 25 Posts: 269 iTrader: 3 / 100% Ride: 91 civic hatch w/b16 and 91 civic hatch project car Rep Power: 8	Somethings not right im getting 290 miles on just under 9 gallons and im running a b16a in a 91 hatchback that is anything but babied

09-17-2009, 01:00 AM	#5
D15Beater HNFTuning Join Date: Jun 2007 Location: Concord N.C. Posts: 548 iTrader: 0 / 0% Ride: or die.... Blog Entries: 1 Rep Power: 19	Running the Pr4 ecu without the fuel purge solenoid found on the integra's firewall will consume mucho fuel, run a Pm6 and itll run better.

10-05-2009, 12:04 AM	#7
Archangl Greenhorn Join Date: Dec 2008 Age: 24 Posts: 6 iTrader: 0 / 0% Rep Power: 0	The funny thing is the samething is happening to me. I have b18b1 with a b16 tranny and I get about 160 to the tank.

10-13-2009, 06:08 PM	#8
Gnarphantom Member Join Date: Mar 2008 Location: Mankato, MN Posts: 68 iTrader: 0 / 0% Ride: LS Swapped CRX Rep Power: 4	I had an LS in my CRX with the LS tranny and got 39.7 to the gallon on average, last weekend I swapped in a B16 tranny instead and have not noticed a difference.

10-29-2009, 05:22 PM	#9
Archangl Greenhorn Join Date: Dec 2008 Age: 24 Posts: 6 iTrader: 0 / 0% Rep Power: 0	what year is the engine?

10-29-2009, 05:47 PM	#10
crxprojectcar Junior Member Join Date: Oct 2009 Location: spokane wa Age: 19 Posts: 23 iTrader: 0 / 0% Ride: 88 b16a rex Rep Power: 1	yea somthings wrong major .. calculate your milege fill your tank to the complete top set your trip counter ... (make sure your wheels and not larger or smaller than stock if you havent fixed your speedo to the wheel size that is ) ... and drive like normal once your almost emty fill all the way back up ... and divide the miles driven by the amount of the last fill up .. and if your not pushing high 20s then you got somthin WAY wrong ... my b16a with y1 trans (low gears lol) im gettin 30-33 mpg and i drive that shit in vtec half the damn time

11-01-2009, 06:11 PM	#11
kidkg24 Junior Member Join Date: Oct 2009 Location: west Age: 24 Posts: 17 iTrader: 0 / 0% Ride: civic/tegra Rep Power: 1	well all this talk, and no answers. Well you can probley fix your problem with some little basic changes. Like take the plugs out, and replace them. Change the fuel filter if you didn't change it yet it prob was never changed, check dist. timing. my car was getting like 16 miles to the gallon, stock when i bought it at a used dealer. I started at the fuel system. when i changed the plugs, oil, and rotor my gas milage became amazing. lol

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b18a1 swap gas mileage problem?