Saxo VTR turbo?

[basskid2k]

Hi there i was wondering if anyone could tell me what make and model of turbo is used in the conversion. I have been told that no head or ecu modifications are required as it only runs at 6psi.

cheers

[Scottp]

depends on the origional conversion? where is this from?

[basskid2k]

its the entry level system from CITUNING.

[Scottp]

it must need some sort of ecu modification whether it be a remap of the ecu or dastek/mf2 to control the fueling, really you cant go chucking 6psi into the engine and not up the fueling to some sort of effect

or everything i thought i knew about engines is rubbish?

or the 6psi is absolute full boost and is that small that the cu can adjust enough, but surely this is holding back the power of the conversion completely

[supersav]

you are indeed right Scott the ecu will indeed need an upgrade of some sort.

Whilst the standard one may well have the ability to phisicly pump enough fuel it won't be able to actualy recognise the boost.

On the standard engine setup it senses the level of load by way of the "map" sensor (Manifold Abselute Pressure), as i'm sure you are aware, the one fitted by citroen is a 1bar map sensor, so there for, is only used as a mesuring device for the vaccum in the manifold.

When the engine is, per say, at idle, the engine is trying to suck in air past a verry small gap between the throttle plate and the throttle housing wall, this crates a vaccum of arround -1bar(-14.7psi or -100kpa).

As the engine is loaded up the vaccum in the manifold is decreased untill, at full load, it reaches a point that is neather vaccum nor presure, known as atmospheric pressure, this is when your citroen sensor raches the limit of it's range.

Now, the important bit........to run a car with +6psi(+0.4 bar or +40.81kpa) you will need a map sensor that has the range of the citroen one plus almost half again on top, and since i've yet to come accross a 1.5bar map sensor you will have no choice but use a 2.0bar sensor.

More importantly though the type of map sensor being used will be defined in the software setup of your ecu, so you will need to access this section of the ecu and change the setup if you are able to or altrnativly use some kind of other control unit to cover this. And that's not to mention the small matter of being able to control the boost.

Pete

[Simop]

The entry level Cituning kit (and maybe higher level) uses an MF2 controller to control the extra fuel injector(s). The one I saw at Donny was wired in using a pressure switch, which is a completely pants way of doing it!

As stated, to do it properly you will need a higher ranged MAP sesnor... and if you dont re-program the std ecu, you will have to trick it so it thiks its not seeing positive pressure.