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another MPG question

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Old May 24th, 2021, 22:01   #21
stuart bowes
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front O2 sensor received and replaced..

wont have a real tangible idea of difference to mpg until a good week of driving but it made some very minor changes to the fuelling, and to pre/post cat readings.

not really a lot but then every little bit helps I suppose

before:


after:


has anyone else got any suggestions as to why my fuel trims are showing plus figures. or maybe a confirmation that those readings are totally fine?

this is all at idle but I revved for a bit and the fuelling didnt seem to change. I'll check again next week but my understanding is 'long term' is only like 20 seconds or so

beyond that really I'm happy to just leave it alone now, pending a test out on the longer roads it seems to be running perfectly. to drive it's smooth as silk and pulls well no hesitancy
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Old May 26th, 2021, 00:49   #22
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So this is probably a total noob mistake but no-one else seems to have spotted it (or maybe just left me to work it out for myself)

apparently area 1,2,3,4,5 is not the different injectors, it's the different 'areas' of the map. 1=idle, 5= full chat, and 3 sections in between

that now makes more sense looking at the gradual increase in values

and it can allegedly take 3 or more drive cycles to recalculate

I still feel like I should be trying to get them closer to zero, so I'm going to try a can of WD40 and see if that shows up any air leaks around the inlet anywhere

interested to know what other peopls's fuel trims are, especially anyone with a N/A 2.4 who gets decent mid 20's urban or good solid mid 30's overall
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Old May 26th, 2021, 23:06   #23
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did a bit of A road driving to try and access all of the fuelling map and give it a chance to re-calculate

now showing
1 - 0.93
2 - 0.93
3 - 1.02
4 - 1.09
5 - 1.12

so not much change from previous

I did ask around about the 140-170 remap, and there's a place near me who will do it including dyno before and after for around £400 ... tbh that's a bit more than I was thinking

I'd have to see an improvement of 3-4mpg over a whole year to break even on that, but it might still be worth it for the extra oomph. on my map apparently bhp flattens off hard at around 4.5k (Which to be fair I can feel when I try to overtake) and the newer map pushes on past that to 6k or so which is where the extra 30bhp comes in.. the bottom end of curve looks nearly identical.. it is tempting I have to admit

this weeks mpg 21.5 but I have added roof bars, so keeping the same average is actually indicative of a slight improvement IMO. And although I did go on an A-road, let's just say I wasn't being economical
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Old May 27th, 2021, 00:07   #24
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Quote:
Originally Posted by stuart bowes View Post
did a bit of A road driving to try and access all of the fuelling map and give it a chance to re-calculate

now showing
1 - 0.93
2 - 0.93
3 - 1.02
4 - 1.09
5 - 1.12

so not much change from previous

I did ask around about the 140-170 remap, and there's a place near me who will do it including dyno before and after for around £400 ... tbh that's a bit more than I was thinking

I'd have to see an improvement of 3-4mpg over a whole year to break even on that, but it might still be worth it for the extra oomph. on my map apparently bhp flattens off hard at around 4.5k (Which to be fair I can feel when I try to overtake) and the newer map pushes on past that to 6k or so which is where the extra 30bhp comes in.. the bottom end of curve looks nearly identical.. it is tempting I have to admit

this weeks mpg 21.5 but I have added roof bars, so keeping the same average is actually indicative of a slight improvement IMO. And although I did go on an A-road, let's just say I wasn't being economical
Remapping is good, but the more power you have, the more tendency you'll have to use it = less mpg.
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Old May 27th, 2021, 00:12   #25
stuart bowes
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lol for the first couple of months or so I reckon that's probably very true, but the novelty would soon wear off, most of my driving is sub 40mph and it's hard / pointless keeping revs high in an auto at those speeds

and then when I am on a fast road, more often than not I have the family in the car and that tends to keep me in check

not like the old days of sticking on some drum and bass, hop over two lanes and nail it
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Old May 27th, 2021, 00:31   #26
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lol for the first couple of months or so I reckon that's probably very true, but the novelty would soon wear off, most of my driving is sub 40mph and it's hard / pointless keeping revs high in an auto at those speeds

and then when I am on a fast road, more often than not I have the family in the car and that tends to keep me in check

not like the old days of sticking on some drum and bass, hop over two lanes and nail it
£400 sounds expensive, but 30bhp is a big increase.
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Old May 27th, 2021, 00:45   #27
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exactly, and it would be backed up by and before and after dyno so it's not just some little kid with a laptop going 'i'll chip your car innit bruv'

Also the original idea was the newer map is reportedly more efficient down the bottom end which I use a lot more, but I'm not entirely convinced

I still want to run it a while longer first to see if any other issues pop up or if I can get the numbers down in other ways

plus, there's a numberplate I've got my eye on for about £600 and tbh that's more appealing lol
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Old May 27th, 2021, 01:25   #28
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exactly, and it would be backed up by and before and after dyno so it's not just some little kid with a laptop going 'i'll chip your car innit bruv'

Also the original idea was the newer map is reportedly more efficient down the bottom end which I use a lot more, but I'm not entirely convinced

I still want to run it a while longer first to see if any other issues pop up or if I can get the numbers down in other ways

plus, there's a numberplate I've got my eye on for about £600 and tbh that's more appealing lol
Depends how much you want the extra power, but by the sounds of it, you don't use it much anyway with the driving you do. I don't think you'll gain much mpg from it though... if the power is there, you'll want to use it. I know the tendency wears off after a while, but what's the point in getting a remap adding extra power if you don't really use the 30bhp extra to its advantage? I know its claimed to be more efficient at the bottom end, but I'd like to see it to believe it.

You might as well keep the £400, or spend it on something else in my opinion. Its a 2.4L petrol engine in a 20 year old car... its not going to be by any means economical as is, never mind with a remap.

Get yourself the number plate instead, forget the remap.
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Old May 28th, 2021, 15:04   #29
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Ha, a 20 year old diesel wagon with "JB 007" number plates.
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Old May 28th, 2021, 15:26   #30
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lol that would be cool but I shudder to think how much..

no I'm thinking of one with STU on it

i wanted BW51 YOB but the missus said no
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