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Fri 7 Sep 2018 08:42

Hyundai i40 1.7 diesel - Remap - TopScot

So on my 3rd i40, it's not anywhere near as fuel efficient as my last 2. I'm wondering if perhaps as its euro 6, something somewhere is impacting on fuel.?

So I spoke to tuning guys who can do a remap.

My question is, will this put added strain on the clutch and DMF? As the transmission on these cars is already very suspect.

Here are the specs

We can remap your i40 for £349 and you can get up to 10% better MPG depending on how you drive it and they go from :

Original BHP 141

Tuned BHP 155

BHP (Increase) 14

Original Torque (Nm) 340

Tuned Torque (Nm) 370

Torque (Increase) 30

You will notice a good difference in the way the car drives, with a sharper throttle response, smoother power curve. If you could let me know your thoughts. Thanks

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Fri 7 Sep 2018 10:07

Hyundai i40 1.7 diesel - Remap - RobJP

If the transmission / clutch / DMF is already known as a weak point, then putting 10% more torque / BHP through it is only going to stress the system even more, making it more likely to fail.

Note that they say it 'can' get 'up to' 10% better mpg. Very carefully worded to not mean anything at all !

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Fri 7 Sep 2018 10:26

Hyundai i40 1.7 diesel - Remap - Falkirk Bairn

A taxi driver does not need more BHP.

I would try some Millers to raise the cetane rating / buy some posh diesel & give the engine a "clean" + Italian tune up every now & then.

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Fri 7 Sep 2018 11:20

Hyundai i40 1.7 diesel - Remap - TopScot

Yeah I did say to the guys in not interested in 0-60 am all about economy. The car gets filled exclusively on BP ultimate, never ever supermarket fuel

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Fri 7 Sep 2018 16:37

Hyundai i40 1.7 diesel - Remap - gordonbennet

Euro 6 presumably with adblu?

Might be worth giving it a while to run in more, my euro 6 lorry was quite heavy on fuel back in late Feb when it was issued to me and for the first couple of months, gradually it's got better, and now giving some 20% better economy now its getting towards run in @ 90k kms, though some of that better economy could be me gradually fine tuning my driving to its different characteristics to get the best from it.

Yes if driven well more torque can be used to better effect, you would notice the power coming in lower in the rev band, but as said by RobJP, the drivetrain on these is already questionable so putting it through more strain by using those lower revs isn't going to help, and we haven't begun to wonder what this might mean for the DPF.

I doubt you would ever recover the cost of remapping in fuel saving alone.

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Fri 7 Sep 2018 17:13

Hyundai i40 1.7 diesel - Remap - skidpan

am all about economy

Remapping your car will save you no fuel if you drive exactly the say way on the same roads that used used before the remap. Every company offering the service uses the word "up to" which clearly means that a 0 mpg improvent is withing their advertised range.

The only way to get better economy is to drive better. Anticipate the road ahead and lift of earlier is one way that potentially saves fuel. Driving slower will help as well. Stick to a "real" 70 mph on motorways instead of keeping up with the Germans and you will save a packet and add very little extra time to your journey.

Example:

12 miles of the wifes 20 mile commute was on the motorway. Used to take her about 30 minutes driving at the speed limits at 7.30 in the morning and 3.00 in the afternoon. Car averaged about 50 mpg over a tankful (including local trips). The speed,limit on the motorway was reduced to 50 mph while they did some pretty serious works, took over a year. Her journey time was only a couple of minutes longer each way but the average mpg over a tankful increased to 55 mpg saving her potentially about £170 a year.

When the roadworks were completed she tried to carry on driving at 50 mph but it was way to scary with HGV's trying to push her off the road. Soon decided it was worth £170 year to stay alive.

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Fri 7 Sep 2018 18:36

Hyundai i40 1.7 diesel - Remap - TopScot

No ad blue in my i40. I wouldn't touch a car with that added expense. My last i40 done 52mpg without trying. This is 40ish at best! And am not a foot the floor driver by any means

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Fri 7 Sep 2018 18:44

Hyundai i40 1.7 diesel - Remap - skidpan

My last i40 done 52mpg without trying. This is 40ish at best

Are those figures from the dash display or calculated using distance and fuel used over several tousand miles?

The dash displays are not always accurate (in truth the one in our Ceed was probably the most accurate we have ever had) but just because one waspotentially accurate does not mean another is. We have had 2 Micra 1.2 in the past, identical cars, both silver, one a 2005 car, the other a 2007. They both averaged about 44 mpg (calculated) in our ownership, the display in the 55 was spot on, the display in the 57 insisted it was 48 mpg

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Fri 7 Sep 2018 19:42

Hyundai i40 1.7 diesel - Remap - badbusdriver

"Remapping your car will save you no fuel if you drive exactly the say way on the same roads that used used before the remap."

I'd have to take issue on this point for a couple of reasons.

It will require a given amount of throttle to have the car maintain 70mph, so if the car has more power, it will require a smaller throttle opening to maintain the same speed, which surely will make a difference to the economy. Same with acceleration, if you want a given level of acceleration, more power will mean you don't need to push the throttle as far down to get the same result.

The other point is regarding my old van, a 2006 Ford Transit Connect 1.8TDCI. None of the Connect's were that efficient for that type and size of van. Mine was the 90ps version, but it was well known (in Transit Connect circles!) that the 110ps version was the most efficient of the range (+3 or 4mpg over the 90ps). This was the same engine as mine, but with more power. As it didn't have to work so hard, it gave higher mpg.

Quite agree on the other points though like good observation and anticipation. Also the driving slower is very pertinent to me, having implememted a new regime of driving at the speed limit, which on the majority of the roads i use, means 50mph for an LGV. I have certainly noticed a difference in mpg but with very little, if any, affect on journey time.

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Fri 7 Sep 2018 19:53

Hyundai i40 1.7 diesel - Remap - gordonbennet

My experience of underpowered vehicles is that they are nearly always heavier on fuel, because you as a completely normal driver get so furstrated with the gutless wonder that you find yourself thrashing it to make any headway at all, when the more powerful than needed being on top of the job could run around all day at little more than tickover taking all in its stride.

Unfortunately the most powerful engine in poor hands could use considerably more fuel than the underpowered if used unwisely.

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Fri 7 Sep 2018 20:07

Hyundai i40 1.7 diesel - Remap - KJP 123

Would not a re-map terminate the warranty?

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Fri 7 Sep 2018 21:17

Hyundai i40 1.7 diesel - Remap - badbusdriver

Would not a re-map terminate the warranty?

Very valid point, and yes, I'd imagine that would definitely invalidate the warranty. Not sure how easy it would be to find out that the car had been remapped though?.

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Fri 7 Sep 2018 21:40

Hyundai i40 1.7 diesel - Remap - FP

"It will require a given amount of throttle to have the car maintain 70mph, so if the car has more power, it will require a smaller throttle opening to maintain the same speed, which surely will make a difference to the economy."

I stand to be corrected, but I think the logic here may be flawed. If I understand correctly, remaps get more power out of an engine by over-fueling - either slightly, or a lot. If this is the case, the "smaller throttle opening" may in fact be delivering more fuel than the car needs and the economy will suffer.

I just don't believe that in some magic way a remap can make the engine more efficient, which is the only way you will decrease the amount of fuel it uses.

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Fri 7 Sep 2018 22:25

Hyundai i40 1.7 diesel - Remap - badbusdriver

"It will require a given amount of throttle to have the car maintain 70mph, so if the car has more power, it will require a smaller throttle opening to maintain the same speed, which surely will make a difference to the economy."

I stand to be corrected, but I think the logic here may be flawed. If I understand correctly, remaps get more power out of an engine by over-fueling - either slightly, or a lot. If this is the case, the "smaller throttle opening" may in fact be delivering more fuel than the car needs and the economy will suffer.

I just don't believe that in some magic way a remap can make the engine more efficient, which is the only way you will decrease the amount of fuel it uses.

Fair enough, I was just working on my own logic, but as I don't know how this extra power is delivered, it is probably flawed!. But I do know that what I said about the Connect van is the case, so I'd be interested to learn how the extra power of the higher powered version is delivered, relative to a remap?

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