I've always tried to buy cars with enough poke, but we bought a Volvo
1.6 diesel because it was a pretty colour and free road tax.
I've not enjoyed it at all, i'd say it was so flat on the bottom end
that it's dangerous to drive especially when pulling into traffic and
have been thinking of getting shut.
Anyway, we had it remapped and it's a totally different car, pulls much
better and if you put the effort in it's actually more economical than ever.
I've always been a sceptic but pleased with the results. Just hoping it
doesn't blow up.
Quite. Just drive along the M4 out of London to where it leaves the
overhead part and becomes 70 mph to see all the diesels smoke when the
foot goes down. Make sure you set the ventilation to re-circ first.
*If love is blind, why is lingerie so popular?
Dave Plowman email@example.com London SW
Suggests either a failed DPF or a DPF delete. Proper high performance
modern diesels with DPF should not show traditionally sooty/dirty exhausts.
Even VAG vehicles with emissions defeat software didn't have sooty/dirty
exhaust. The whole point was the NOX emissions were way up but it looked
clean. If it looked dirty it would not have passed the emissions checks
it was cheating.
The theory/claim behind remaps is that the 'standard' map in the engine
is a 'one size fits all' - not only in terms of overall performance
(balancing economy, engine output, stress etc) but also the
characteristics of the individual engine.
By 'tweaking' things, the remap can adjust the trade off and, possibly
to an extent, allow for the characteristics of 'your' engine. How much
the difference latter makes with modern production techniques is open
to debate. How much difference in real terms is there between your
Volvo engine and the next one off the production line- or even one made
a month before?
Certainly remapping is popular in some quarters. Some motorhomers have
their engines remapped - especially those who have bought the less
powerful versions and found they'd like a bit more 'umpf' or even
economy. I've never bothered, I opted to go for the more powerful
version originally, at least in our current MH as it is heavier- mainly
as it is less complicated insurance wise.
As for damaging the engine, I suspect if the tweaking is modest then the
chances of damage are modest. As I understand it, some more powerful
versions of the same vehicle use the same basic engine but the extra
power is gained by changing either tuning and/or ancillaries. That
suggests the basic engine has some safety margin.
A diesels power output is controlled or throttled by the injection
period / how much fuel is injected for each induction stroke. Some
engines are deliberately throttled to less than the maximum, so those
engines can be remapped without worsening the emissions.
My BMW engine has been remapped, which has added 30bhp, improved the
torque, made it more tractable and a much nicer drive. Emissions and
economy have been improved slightly.
Manufacturers make a standard engine. They then set the mapping to give
2 or 3 different power outputs and then charge gullible customers as if
it were a different physical engine. Just like they used to charge extra
for a few cheap fittings in L GL GLS versions.
Going back, those distinctions were necessary for the company car market.
So a deputy assistant under manager could have a car very slightly
"better" than an assistant deputy assistant under manager.
I was amused to note that meant on a Montego a fuel warning *light* was
part of the trim. A friend had the model with just a gauge. My we had
some laughs running out of fuel ....
I had a Jag XR8 and in the handbook it mentioned "optional" cup holders.
The Jeeps on the other hand came with everything as standard, electric
seats, acd, cruise control his and hers fob keys alloy wheels etc.
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