#1: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 2:01 pm ---- Could changing the back box decrease MPG by 10 miles??
Quick simple question. Thank youuu
#2: Re: Increasing MPG Author: tomd0801754, Location: MoscowPosted: Sat Jan 22, 2011 2:03 pm ---- Depends. Unlikely but it probably could. When was it last serviced?
#3: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 2:11 pm ---- Hmmmmm, i think about 5 months ago. what should i replace do you reckon? Im trying to get the most out of my car fuel wise.. I got a 4" peco n thinking about going back to standard box to increase the MPG. I dont even drive heavy footed either.
#4: Re: Increasing MPG Author: Rich196, Posted: Sat Jan 22, 2011 2:46 pm ---- i could swear i have heard a couple of people on here, saying new standard exhaust systems or just back boxes have affect their mpg for the worse
#5: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 2:48 pm ---- Rich196/ what u mean? that aftermarket ones have decreased the MPG??
#6: Re: Increasing MPG Author: JJ0063, Location: NorfolkPosted: Sat Jan 22, 2011 2:55 pm ---- I just removed a 4" slash cut from my 1.4 & replaced it with a 2nd hand standard box, my MPG is now improving! and car feels SLIGHTLY quicker now its got some back pressure!
#7: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 2:57 pm ---- JJ0063/ by how much difference is it improving? Im seriously thinking about going back to standard but i dont want a pea shooter of an exhaust
#8: Re: Increasing MPG Author: west1, Location: SouthamptonPosted: Sat Jan 22, 2011 3:02 pm ---- they would do as the goverment is co2 mad so it could be something to do with that.
#9: Re: Increasing MPG Author: JJ0063, Location: NorfolkPosted: Sat Jan 22, 2011 3:05 pm ---- Well, I used to get 44 miles to £10 @ £1.25pl, so roughly 23mpg (I know..)
I brimmed my tank £55 @ £126.6,, still have half a tank left and have done 194 miles..
havent sat down to work out figures but so far to me that seems better, & the first 40 miles were with the old exhaust!
Cheers
#10: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 3:13 pm ---- JJ0063/ thats a lot better that aint it. and is that with your standard exhaust? not a gti one or any thing
#11: Re: Increasing MPG Author: JJ0063, Location: NorfolkPosted: Sat Jan 22, 2011 3:16 pm ---- seems it so far! when my light comes on i'll do the mpg calculations & report back, but yeah im sure i didnt get much more than what ive done now, to a FULL tank before!
it's a standard 1.4 pea shooter exhaust, thinking about cutting tip short & welding the end can from my old exhaust over the top, so in theory still looking like the slash cut but without the noise etc
#12: Re: Increasing MPG Author: DJ-, Location: UKPosted: Sat Jan 22, 2011 3:17 pm ---- what exhaust did you have before jj0063?
#13: Re: Increasing MPG Author: JJ0063, Location: NorfolkPosted: Sat Jan 22, 2011 3:18 pm ---- Im not sure on the make but it was a 4 inch slash cut japcan style, i'll find a pic of it on the car if you like?
#14: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 3:21 pm ---- that is actually a good idea cutting it off then welding it back on the standard one. it wont look stupid will it.
#15: Re: Increasing MPG Author: JJ0063, Location: NorfolkPosted: Sat Jan 22, 2011 3:22 pm ---- Backbox I just removed:
#16: Re: Increasing MPG Author: DJ-, Location: UKPosted: Sat Jan 22, 2011 3:23 pm ---- Oh right i see. Looks in pretty bad state too tbh!
#17: Re: Increasing MPG Author: JJ0063, Location: NorfolkPosted: Sat Jan 22, 2011 3:24 pm ---- thats just the top coat peeling but yeah it needed some TLC! Considering cleaning it up, painting it & sticking it on ebay tbh!
#18: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sat Jan 22, 2011 3:30 pm ---- Could you not cut the small one out n have the big one?
#19: Re: Increasing MPG Author: wull, Location: killin,scotlandPosted: Sun Jan 23, 2011 2:07 am ----
JJ0063 wrote:
Well, I used to get 44 miles to £10 @ £1.25pl, so roughly 23mpg (I know..)
that's really bad it works out to just under 25mpg,24.8mpg roughly.still horrendous though.
i wouldn't of expected a back box to effect the mpg by a massive amount,certainly not by 10 miles.
#20: Re: Increasing MPG Author: Mike_XS, Location: SouthamptonPosted: Sun Jan 23, 2011 7:14 am ---- I've got a 3" Sportex on the back of my car and I'm still getting 35-37 mpg driving sensibly. If I boot it, having the Sportex on uses more fuel than the standard box.
#21: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sun Jan 23, 2011 11:03 am ---- AsphericSmile - where did u get your exhaust from mate?
#22: Re: Increasing MPG Author: -Dave-, Location: North ManchesterPosted: Sun Jan 23, 2011 11:20 am ----
AsphericSmile wrote:
I've got a 3" Sportex on the back of my car and I'm still getting 35-37 mpg driving sensibly. If I boot it, having the Sportex on uses more fuel than the standard box.
I will second that.
#23: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sun Jan 23, 2011 11:31 am ---- Where u get them from?
#24: Re: Increasing MPG Author: -Dave-, Location: North ManchesterPosted: Sun Jan 23, 2011 11:42 am ---- www.sportex-exhausts.com/
You can get them a bit cheaper from Ebay but I preferred to pay a bit extra to make sure I was getting the right bits.
They are direct fit also so take the old one off, New one on no messing about.
#25: Re: Increasing MPG Author: army-joe, Location: kentPosted: Sun Jan 23, 2011 12:43 pm ---- nice one cheers
#26: Re: Increasing MPG Author: Mike_XS, Location: SouthamptonPosted: Sun Jan 23, 2011 4:40 pm ----
army-joe wrote:
AsphericSmile - where did u get your exhaust from mate?
I got it off a guy off here. It's worth looking in the for sale section.
We are not responsible for comments posted by our users, as they are the property of the poster
Interactive software released under GNU GPL,
Code Credits,
Privacy Policy
Membership:
Latest: 
New Today: 0
New Yesterday: 0
Overall: 17132
Online Now [55]:
Visitors: 54
Members: 0
Staff Online Now:
Page Views:
General
it works out to just under 25mpg,24.8mpg roughly.still horrendous though.
