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Chipping
There is very little hp gain to be achieved by chipping a N/A engine. A
remaps N/A engine should give it a little big smoother power delivery and
more torque lower down. But the increase is very small. They can cost up to
£500 for custom remaps.
The different types of remap are
1- The ebay resister mods. These mods SHOULD NOT be used on a petrol car.
They connect to the temperature sensor, which is used to measure the air
fuel mixture. The mod fools the ECU into thinking its very hot and since
fuel is less dense more should be injected during the normal cycle. Since
its not that hot the extra fuel increases the air fuel mixture to engine
damaging levels. This type of mod is used on diesel often as there is no air
fuel mixture problem. Ebay seems to have loads of these for sale so that why
I call it the ebay mod. This wont work on the Clio Dci as the Ecu it
different there is no temperature sensor as such and disconnecting any of
the sensors gives lower power (although better economy possible when driven
hard as there less fuel injected)
2- Add on, this is connected into the normal wiring and piggy backs the
normal ecu (this type is used on diesels usually as it adds more fuel every
cycle.
The disadvantages of this (on a diesel) are that by filling the cylinder
before the normal mapping does you severely increase the max pressure the
piston is under, also when the fueling is increased after the normal timing
that internal combustion temps rise which can get close if not exceed the
limits of the turbo also smoke levels rise as much of the extra injected
fuel doesnt combust and so gets exhausted whilst unburnt. Make sure when
you buy one of these that it isnt the mod described in 1.
3- New ECU. The "group N" RSport one is a good example. its a whole new ECU
and had the advantage of being able to be removed for warently work. The
milage for the new Clios is stored in the dashboard so by replacing the ECU
you wont loose all your millage. the advantages of the Rsport and other
ones is minimal mainly down to smooth power delivery. A few problems with
judering problem have been noticed at low revs with the RSport one and this
may be down to the race mapping.The Rsport one is the only new ECU remap
that I know of and only works (at the moment on the Cups without aircon).
This may change though as the ECU is supposidly the same with the
aircondtioning and ABS being turned off.
4- Soldering new chips. This is done by the company removing the chip on the
ecu which holds the maps and soldering either another chip in its place or
soldering an socket on ther. (this is so the ecu chip maps can be swopped at
resale/servicing) it has the advantage of being the method that custom
remapers use to get the new ECU
5- New remap Via OBD this is the latest type of programming it is doen by
laptop programming the ecu via the diagnostics port (the one under the ash
tray) it leaves no trace and is used by companies such as
http://www.superchips.co.ukU color=#0000ffwww.superchips.co.uk/U (Cliosport memebr get a discount here). The
disadvantages of this are that you arnt able to sell the mod on as its
totally electronic the next owner is the only possible buyer. Companies such
as Superchip give you the old mapping on a credit card sized chip so when
you come to sell the car the car can be returned to any dealer and the old
mapping reinstalled.
Ecu gains
1.2 ~ 3hp
1.4/1.6 ~5hp
172/Cup ~ 7hp
These are complete guesses you may get more you may get less but the gains
as you can see are minimal
DCi 65 (normal power ~70hp)with a tuning box 82~88hp, remap ie superchips
88~97hp
DCi 80 (normal power ~85hp)with a tuning box 95~105hp, remap 100~110hp
The higher gains on the Diesels are down to over mapping IMO. Torque gains
on the 80hp abroad by one remaping company is 200lb and 110hp is to much IMO
the remap must extend the fueling in both directions causing massive
increases in the max pressure the piston is under, also when the fueling is
increased after the normal timing that internal combustion temps rise which
can get close if not exceed the limits of the turbo also smoke levels rise
as much of the extra injected fuel doesnt combust and so gets exhausted
whilst unburnt.
HOWEVER SOME GOOD NEWS. The remaps are tested to stay below excessive
increses and should cause no problems. Some VAG tunning box diesels had had
blown turbos due to excessive pressure being required of them. The problems
were only discovered many years later and the tuning boxes which were
affected were the ones advertising the biggest gains and that had put to
much demand on the engine
EDD
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