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Old 7th June 2024, 08:08   #21
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Originally Posted by Ray L View Post
I had a re-map on my cdti 130. Little difference noticed on actual performance but probably a consistent 10% improvement on mpg.
Interesting. Do you know how it improves MPG? Timing changes or something?
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Old 7th June 2024, 08:36   #22
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Interesting. Do you know how it improves MPG? Timing changes or something?
Could be because the mid range torque is significantly improved. Whether it produces 160bhp or not, it is worth doing.
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Old 7th June 2024, 08:43   #23
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Could be because the mid range torque is significantly improved. Whether it produces 160bhp or not, it is worth doing.
Mm. So you're revving it less, at the end of the day. That would make sense.
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Old 7th June 2024, 09:03   #24
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Could be because the mid range torque is significantly improved. Whether it produces 160bhp or not, it is worth doing.



I would agree with this.. I did a run up to Manchester and back a year or so back and did a brim to brim check for consumption and it returned 57.1 mpg which i was very happy with.
https://www.the75andztclub.co.uk/for...d.php?t=269044
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Old 8th June 2024, 09:58   #25
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Could be because the mid range torque is significantly improved. Whether it produces 160bhp or not, it is worth doing.
It isn't (compared to a stock 131ps). I'll find a dyno printout showing the map vs a stock 131ps tune.

Also, just so people know with regards to MPG, once remapped you can never trust the MPG readout on the car, it uses the stock injector timings and duration to calculate the MPG, once these have been altered on the ECU the IPK isn't aware and miscalculates.
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Old 8th June 2024, 10:12   #26
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Also, just so people know with regards to MPG, once remapped you can never trust the MPG readout on the car, it uses the stock injector timings and duration to calculate the MPG, once these have been altered on the ECU the IPK isn't aware and miscalculates.



So how would that explain the results from a brim to brim test as explained in my post?
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Old 8th June 2024, 10:22   #27
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So how would that explain the results from a brim to brim test as explained in my post?
Going on a drive isnít scientific. Engine temperature, gear changes, external temperature, fuel, fuel temperature, air quality, air temperature at intake, throttle usage, engine adaptations will have been reset during map, injectors could decide to perform better one day, higher voltage could result in higher fuel pressure etc. There is all sorts that effects mpg. Do the same trip multiple times and youíll get different readings.
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Old 8th June 2024, 10:24   #28
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Going on a drive isnít scientific. Engine temperature, gear changes, external temperature, fuel, fuel temperature, air quality, air temperature at intake, throttle usage, engine adaptations will have been reset during map, injectors could decide to perform better one day, higher voltage could result in higher fuel pressure etc. There is all sorts that effects mpg. Do the same trip multiple times and youíll get different readings.

You mean that the figure could be even higher!!
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Old 8th June 2024, 10:50   #29
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Going on a drive isnít scientific. Engine temperature, gear changes, external temperature, fuel, fuel temperature, air quality, air temperature at intake, throttle usage, engine adaptations will have been reset during map, injectors could decide to perform better one day, higher voltage could result in higher fuel pressure etc. There is all sorts that effects mpg. Do the same trip multiple times and youíll get different readings.

A 412 mile "drive" is a reasonable sample and clearly every journey would produce different figures due more to traffic than most other variables however i did not claim that it was anything more than a snapshot showing the map had certainly not reduced MPG on this run.
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Old 8th June 2024, 11:10   #30
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A 412 mile "drive" is a reasonable sample and clearly every journey would produce different figures due more to traffic than most other variables however i did not claim that it was anything more than a snapshot showing the map had certainly not reduced MPG on this run.
Oh you wonít lose MPG during general driving. A remap wonít ever give more MPG unless you have the car mapped for less power. More power = more fuel, itís as simple as that. Yes the power curve can be shifted so you get more power low down, but that means youíre using more fuel lower down in the revs than you were before.
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