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Old 04-09-2008   #1
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Question So does your remapped 1.9GPS really have better fuel economy?

Been recording my fuel consumption since I got the car from new
Had a remap and have noticed the fuel consumption hasn't really improved but the trip computer mpg is now consistently over reading (averaged over 38 tankfuls):

Pre remap
Trip computer 43.95mpg
Calculated 44.58mpg

Post remap
Trip computer 48.95mpg
Calculated 44.81mpg

That's a +4mpg error post remap .
Attached a graph for those of a certain persuasion!

Now I'm not moaning cos I love the remap and does exactly what I wanted.
Calculated values come from pump litres and trip odometer reading. Before anyone suggests, measured the trip odometer against google maps and it is considerably accurate less than 0.5% error.
Attached Files
File Type: pdf GP 1.9 fuel economy.pdf (59.8 KB, 38 views)
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Old 04-09-2008   #2
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Re: So does your remapped 1.9GPS really have better fuel economy?

wow you've really took anal to the next level!. Interesting info though! .
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Old 04-09-2008   #3
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Re: So does your remapped 1.9GPS really have better fuel economy?

I've got to be honest I also noticed my MPG over reading by quite a bit but to be honest I've not taken the time to note figures and calculate averages.

Used to read 47mpg but calculated closer to 40mpg

This doesnt seem to be tied to pre/post map though in my case (at least I dont think it is)
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Old 05-09-2008   #4
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Re: So does your remapped 1.9GPS really have better fuel economy?

I really hope that my computer doesnt over read lol
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Old 05-09-2008   #5
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by punto_matt View Post
I really hope that my computer doesnt over read lol
Lmao Matt...

Not being quite so anal as the OP I can say that a 35 purchase of diesel used to last me 4 - 6 days but the last 2 weeks (post re-map) I have got to sundays each week (7 days) with some to spare. Driving pattern pretty much the same, no long distance stuff and no prolonged mad sprints its been too friggin wet but I will get anal and do the sums.
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Last edited by Ffoxy; 05-09-2008 at 09:31.
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Old 05-09-2008   #6
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by ChrisUK View Post
wow you've really took anal to the next level!. Interesting info though! .
I am aware it's not terribly exciting but for my job I am involved in measurements and data analysis so wasn't much effort. Also in my defence I have to record my fuel purchases for company car expenses so just do this every time I fill up.

My point is that some people use the possibility of better fuel consumption as a minor reason for getting a remap.
Ain't so in my case, just saying you can't rely on the trip computer post remap and afaiac numbers/facts speak more than subjective opinions.

Quote Quote:
Used to read 47mpg but calculated closer to 40mpg.
I get +7mpg worst case
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Last edited by BigAde; 05-09-2008 at 11:55. Reason: forgot something
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Old 05-09-2008   #7
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by BigAde View Post
My point is that some people use the possibility of better fuel consumption as a minor reason for getting a remap.
Ain't so in my case, just saying you can't rely on the trip computer post remap and afaiac numbers/facts speak more than subjective opinions.


I get +7mpg worst case
With the BHP and Torque gains, the little extra MPG hasnt even entered my mind when it comes to thinking about a re-map. lol. but i guess if its even the same then im very happy. because of the performance increase.
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Old 05-09-2008   #8
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by beany_bot View Post
With the BHP and Torque gains, the little extra MPG hasnt even entered my mind when it comes to thinking about a re-map. lol. but i guess if its even the same then im very happy. because of the performance increase.
Damn right... Point is the car "goes" more easily in higher gears, less or no downshifting needed. Torque and power curves are now smooth and even with the standard maps dips at 2000 to 2400 rpm and 2750 and 3400 rpm now gone, far more linear delivery and its noticeable not just in performance but in the wallet too.

IMO!
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Last edited by Ffoxy; 05-09-2008 at 14:15.
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Old 05-09-2008   #9
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Re: So does your remapped 1.9GPS really have better fuel economy?

Any better fuel economy is just a bonus as far as i'm concerned.

Agree with ffoxy that changing down etc is not as much of a regular occurance due to the low down torque gains which is a big contributor.
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Old 05-09-2008   #10
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Re: So does your remapped 1.9GPS really have better fuel economy?

Jumped to GP threads to see if FOLLICKLY CHALLENGED FFOXY was still enjoying improved economy since our trip to Watford, I know about the follickles because we shared that cold head feeling outside RED DOT,
Mine was reading 42 but getting 41-43. Since the remap it reads 51 after a mixture of different roads and short / long trips but on refill, at the same garage and pump, the calculated usage taken from the trip odemeter and gallons used, was actually 41.
So no change in MPG in real terms, just a huge leap in power
Shame really, because I was thinking I had a big economy increase too.
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Old 05-09-2008   #11
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Talking Re: So does your remapped 1.9GPS really have better fuel economy?

Theres a lot of bull floating about how remaps work.

1. Manufacturers/ECU designers don't release source code to Joe Remap.

2. Joe Remap doesn't have the resources to reverse engineer ECU software in any detail - he gets his info from Johnny Pirate

3. Johnny Pirate is a pretty smart guy who's worked out how to patch a bit of wobbly code into the software. The bit just before the injectors fire.

4. Joe Remap and all his chums down at the rechip saloon pay Johnny a wodge to get this software kludge running on their kit, they all agree not say anything to anyone and everyones a happy bunny.

5. The reason the mpg does not actually increase is simple - you don't get something (increased power) for nothing (less fuel). Power/torque increase in diesels is SIMPLY OVERFUELLING.

6. The reason you think (i.e. the "on board computer") is getting better mpg, is the software is cocked up. You're operating lower down in the maps and the untouched bit of the software assumes lower injection rates than is actually the case.

7. All remaps are detectable - A simple CRC check on the code memory would show it up.
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Old 06-09-2008   #12
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by corsakid View Post
Theres a lot of bull floating about how remaps work.

1. Manufacturers/ECU designers don't release source code to Joe Remap.

2. Joe Remap doesn't have the resources to reverse engineer ECU software in any detail - he gets his info from Johnny Pirate

3. Johnny Pirate is a pretty smart guy who's worked out how to patch a bit of wobbly code into the software. The bit just before the injectors fire.

4. Joe Remap and all his chums down at the rechip saloon pay Johnny a wodge to get this software kludge running on their kit, they all agree not say anything to anyone and everyones a happy bunny.

5. The reason the mpg does not actually increase is simple - you don't get something (increased power) for nothing (less fuel). Power/torque increase in diesels is SIMPLY OVERFUELLING.

6. The reason you think (i.e. the "on board computer") is getting better mpg, is the software is cocked up. You're operating lower down in the maps and the untouched bit of the software assumes lower injection rates than is actually the case.

7. All remaps are detectable - A simple CRC check on the code memory would show it up.
Thanx for that, please let Oldschool know he has been ripped off and you can help him understand his Business much betterI am sure he will be grateful.
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Old 06-09-2008   #13
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by Ffoxy View Post
Thanx for that, please let Oldschool know he has been ripped off and you can help him understand his Business much betterI am sure he will be grateful.
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Old 06-09-2008   #14
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by corsakid View Post
Theres a lot of bull floating about how remaps work.

1. Manufacturers/ECU designers don't release source code to Joe Remap.

2. Joe Remap doesn't have the resources to reverse engineer ECU software in any detail - he gets his info from Johnny Pirate

3. Johnny Pirate is a pretty smart guy who's worked out how to patch a bit of wobbly code into the software. The bit just before the injectors fire.

4. Joe Remap and all his chums down at the rechip saloon pay Johnny a wodge to get this software kludge running on their kit, they all agree not say anything to anyone and everyones a happy bunny.

5. The reason the mpg does not actually increase is simple - you don't get something (increased power) for nothing (less fuel). Power/torque increase in diesels is SIMPLY OVERFUELLING.

6. The reason you think (i.e. the "on board computer") is getting better mpg, is the software is cocked up. You're operating lower down in the maps and the untouched bit of the software assumes lower injection rates than is actually the case.

7. All remaps are detectable - A simple CRC check on the code memory would show it up.
On second thoughts just GTFO Corsa boy. WTF?
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Last edited by Ffoxy; 06-09-2008 at 22:30.
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Old 07-09-2008   #15
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Re: So does your remapped 1.9GPS really have better fuel economy?

Quote Originally Posted by Ffoxy View Post
On second thoughts just GTFO Corsa boy. WTF?
Where'd the tact go, after the first response? :d Lmao!
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