Hi have no experience of this myself but a neighbor had his vw based motorhome maped last year 2.6ltr diesel i think.

Him And His Wife Go To The Same Park 3 Times A Year And On That Jouney They Have Seen Mpg Gains.

Most Of The trip Is Motorway And He Told Me His mpg Has Gone Up Over Before Because He Can Hold His Speed At A Lower Rpm. He Also Doesnt Need To Change Down A Gear On The A Road Hills They Drive Up.

This In Mind, Its Unlikely To increase Mpg In Town??

(Excuse My Galaxy S3 Putting A Cap Infront Of Every Word!!)

Keep in mind the fuel consumption readout can lose accuracy with a remap. I'm still trying to get a baseline on mine following my eco map. But it appears to be about 2-3% different from the previous calibration.

Yes remaps can save fuel in town too.

Edited 10 April, 201313 yr by Kiwibacon

Hi have no experience of this myself but a neighbor had his vw based motorhome maped last year 2.6ltr diesel i think.

Him And His Wife Go To The Same Park 3 Times A Year And On That Jouney They Have Seen Mpg Gains.

Most Of The trip Is Motorway And He Told Me His mpg Has Gone Up Over Before Because He Can Hold His Speed At A Lower Rpm. He Also Doesnt Need To Change Down A Gear On The A Road Hills They Drive Up.

This In Mind, Its Unlikely To increase Mpg In Town??

(Excuse My Galaxy S3 Putting A Cap Infront Of Every Word!!)

Revs and actual MPH are locked im afraid so you cant hold 70mph at say 2000 revs one day but achieve the same speed at 1800 revs the next day. Your clutch would need to be slipping or something.

Having the ability to hold higher gears on a hill is achievable though as a remap will give you more torque at a particular rev range.

This extra torque is very useful and propably a good reason iteslf to remap a motorhome but doing it purely for MPG gains is a waste of time. Any slight improvement is nice but the real gains and the only justifiable reason to map any car is for performance gains.

Revs and actual MPH are locked im afraid so you cant hold 70mph at say 2000 revs one day but achieve the same speed at 1800 revs the next day. Your clutch would need to be slipping or something.

Im guessuing he probably means he dosent need to change down, ie hold speed in a higher gear at lower revs

Would agree with your other point tyhat the main reason to remap is for performance & not just for the top speed, every car I have had remapped just becomes easier to drive as you have more power agreed but also a better spread of that power.

The map manufacturerts put on a car is a compromise after months of testing in all conditions, the car has to perform reosnably well on low quality fuels found in some other countries, when brits go off into Europe & drive at altitude in the mountains the car has to still run, likewise if you are in the alps & its -20. Also it has to ensure the engine lasts for 100+ thousand miles.

Remap a car in the uk & you have great fuel, the cars unlikely to go above 3-400 feet above sea level ( I know a few will) & you dont need to ensure everything lasts for many many miles so the parameters the mapper has to allow for are less & he can see significant gains. My present toy, a twin turbo 350 Zed mapped at sea level refused to start after a night parked at the top of Stelvio due to the rarified atmosphere

Edited 11 April, 201313 yr by Stuart_J

Remap a car in the uk & you have great fuel, the cars unlikely to go above 3-400 feet above sea level ( I know a few will)

I think you mean 3-400 meters? 400 feet is 120 meters, I live at more than twice this and go over four times this on the way to work in Manchester, so I guess most people who travel away from the coast will get above 400 feet.

I'm still equating the fuel savings from my eco map. Best estimates so far is 8-10% better.

I can drive to 2000m altitude, so the average performance map would be a great way to overspeed and explode a turbocharger.

I've been quoted £250 for a Shark remap.

Using http://www.fuel-econ...o.uk/calc.shtml it suggests that 100 miles at roughly 52MPG (my average at present) with diesel being £1.44 a litre right now, gives a total cost of £12.58

If I change the MPG to 57, the total cost for the same is £11.48 (saving £1.10 every 100 miles).

So, assuming efficiency improves (but by only 5mpg) and insurance cost doesn't increase, I'm looking at breaking even after approx 22,500 miles.

That, in itself, is not a great saving. However, a nicer drive over 22,500 miles is probably worth the £250 alone anyway, right?

OK. If I factor in the £130 a year extra my insurance company wants, there's no way that this is beneficial in economic terms!

Lets hope mine does also then because with everything going up in price and wages being frozen we could do with some help.

Who are u with?

if you can't afford to pay for something, don't do it.

You are uninsured and if you injure or, God forbid, kill anyone or write another car off, all the financial pain is on the victim, apart from the fact you could face prosecution and a lengthy ban.

Get it insured properly bozo

Surely a remap is about one primary objective - more power therefore more performance. If economy is your primary goal, the ultimately the only effective way is to change your car.

Surely a remap is about one primary objective - more power therefore more performance. If economy is your primary goal, the ultimately the only effective way is to change your car.

No. There are things called eco maps produced specifically to reduce fuel consumption, there are other maps simply to remove DPF functions. A remap is simply a different tune, there can be a huge number of goals other than more power.

From what I understood, at least on a diesel (always ready to be shown otherwise), that the engine was being run as close to optimum as possible. So you'd be able to do the same with less fuel, or more with the same amount of fuel.

Well somebody wanted me to point out a case, not a remap but what can hsppen if you don't disclose fully to insurance.

www.scotscourts.gov.UK/opinions/A119_11.html

Oh please, and what was your point with that case? Not even close to being relevant. It is almost impossible to check a good remap, they are < 2% different from an original in thousands of lines of codes. You have to compare line by line. Even in cases of death the police do not do this. A good remap is almost impossible to spot even by the main dealer, they just tend to put the original back on as a write over.

Whilst I understand the issue of not informing your insurance for a remap, is it any worse than deliberately speeding? Those complaining about legality, I am sure, knowingly break the law when speeding, it's fine until caught....

A remap is for many reasons... speed being one of them!! If someone wishes not to inform their insurance company... get over it. If they hit you, you will still be paid. Its their call.

Lets keep to the original question..... How much more fuel economy is gained, especially if you do not change your driving style?

Oh please, and what was your point with that case? Not even close to being relevant. It is almost impossible to check a good remap, they are < 2% different from an original in thousands of lines of codes. You have to compare line by line. Even in cases of death the police do not do this. A good remap is almost impossible to spot even by the main dealer, they just tend to put the original back on as a write over.

Whilst I understand the issue of not informing your insurance for a remap, is it any worse than deliberately speeding? Those complaining about legality, I am sure, knowingly break the law when speeding, it's fine until caught....

A remap is for many reasons... speed being one of them!! If someone wishes not to inform their insurance company... get over it. If they hit you, you will still be paid. Its their call.

Lets keep to the original question..... How much more fuel economy is gained, especially if you do not change your driving style?

Can i ask what experience you have of investigating fatal road traffic accidents?

Whilst i appreciate its off topic, somebody asked me to point out a case where failure to disclose has resulted in insurance issues. I have done that.

I am not sure what you mean by some of your post but most of it is a bit silly really. Lets just hope that you personally dont end up in the clarts at some point with either the insurance company or the law due to undeclared mods.

Edited 16 April, 201313 yr by ed209

At the end of last year I had my Skoda Octavia Tdi Vrs re mapped at a company called Angel Tuning. I now get a return of 52.6 mpg, pick up and response is totally diffrerent. I have recent video of the dash board showing this mpg at 50+ mph it was on a normal run into the city of Peterborough, so dual carriageways, B roads, and some villages en route. Cannot attach the file to this to prove as file too big.

im booked in for saturday i've wanted to do it for ages but was always afraid of putting presure on the clutch etc anyboday have any issues after the remap? or things to watch out for?

From what I understood, at least on a diesel (always ready to be shown otherwise), that the engine was being run as close to optimum as possible. So you'd be able to do the same with less fuel, or more with the same amount of fuel.

Yes, that's exactly what happens. Closing EGR at cruise bumps efficiency up by a few percent, advancing the timing bumps it up a few percent higher still. You can also get a few percent more in a manual car by being able to run in higher gears.

The tradeoff, with EGR removal and advanced timing you have just turned a Euro 4 car into a Euro 3 car.

Well somebody wanted me to point out a case, not a remap but what can hsppen if you don't disclose fully to insurance.

www.scotscourts.gov.UK/opinions/A119_11.html

Link's not working for me.

But googling it shows the insurance was void because he didn't give the full model name of the car. Back then (2008) insurers apparently couldn't find out car details from the supplied registration plate. Which to me smells pretty bad.

The actual car is far more desirable to theives than the description given. That was the problem.

Completely irrelevant to the current discussion. The case was not even about modifications.

im booked in for saturday i've wanted to do it for ages but was always afraid of putting presure on the clutch etc anyboday have any issues after the remap? or things to watch out for?

One of the maps in the ECU is a torque limiter that is set throughout the rpm range. This is there to protect the clutch and drive-line. Sensible tuners only give torque increases that clutches can handle.

Edited 16 April, 201313 yr by Kiwibacon

No. There are things called eco maps produced specifically to reduce fuel consumption, there are other maps simply to remove DPF functions. A remap is simply a different tune, there can be a huge number of goals other than more power.

But we've been through these, and all they can do is make marginal gains throughds bypassing the OEM emissions control programme parameters?

Accept there are others like DPF etc, but most "remaps" are marketed and bought for power not for economy.

But we've been through these, and all they can do is make marginal gains throughds bypassing the OEM emissions control programme parameters?

Accept there are others like DPF etc, but most "remaps" are marketed and bought for power not for economy.

I'm about 8-10% gain. That's not marginal.

Yes most remaps are sold for power and most lowering kits are sold for looks.

But you shouldn't ignore the clued up minority.

I'm about 8-10% gain. That's not marginal.

Yes most remaps are sold for power and most lowering kits are sold for looks.

But you shouldn't ignore the clued up minority.

I had an "economy" map on my BMW. Made absolutely no difference to MPG. Power and torque were improved though. Also had a more aggressive map for this car but i generally left the economy map on as the power and torque gains were more conservative so had a more linear delivery compared to the full bhuna map. Didnt even see 1 mpg more with map installed but then i didnt buy it for economy.

I had an "economy" map on my BMW. Made absolutely no difference to MPG. Power and torque were improved though.

Wasn't really an Eco tune then. Proper Eco tunes don't change torque or power.