Increased Diesel Performance
 

I am interested in any feedback from anyone who has fitted a diesel tuning box to an X3 3.0 Diesel.

There seem to be so many out there and its hard to decide on what the best one is to buy and that wont cause any problems.

Thanks in advance! :)

PS Ive been searching around down here in Aust. and there is little know about them. :tsk:

Hard to beat a Tunit box!You can even reprogram it!Great product.
Check this out.

http://www.xoutpost.com/x5-e53-forum/...ighlight=tunit

Is there any tuning box brands to stay away from or has anyone had any BAD experiences???

Cheers,

DC

http://www.tdi.com.au/

I've just picked up my 3.0d and thinking the same thing. The local distributor have a good reputation with the Audi chips.

Chris

Problem being here is that TDI get the extra power by increasing the injector pump pressure....not a good move :tsk:

Sounds like you have done some research on a few of the tuning products. Any chance of a summary of the differences between the products? Also interested as to why adjusting the fuel pump pressure is bad. How do the other products change the tune?

Chris.

Majority of products(power boxes) for Common Rail Diesel engines like in the X5 3.0d are very simple plug and play!They are simple because they connect to your fuel pressure sensor in the rail ,thus increasing the fuel pressure.This sensor normally has 3-wires .Positive(5.0 Volts),Ground and a Variable voltage wire.Upon measuring the voltage on this wire and with the engine running ,one can measure the voltage according to RPM.On a standard 3.0 D X5 I measured 1.1 Volts @1000rpm and 2.3 Volts at @4500rpm.With a power box this figure will normally read 4.7 Volts at anything over 3000rpm!This I will explain next!Some boxes differ in that they are adjustable by turning a knob or by pre-settings that simply increases the voltage from 1.0 Volts to a maximum of 5.O Volts,(car electronics allowing?Some cars have a safety measure at 3.5 Volts and cut our for 30 seconds before letting you "boost" again.

My recommendation goes to the Tunit box,which is also programmable.

www.Berrimadiesel.com.au which use http://www.dpchip.com/

I have found this company which apparently uses Australian based fuel maps. Apparently these used to use Tunit but have switched to the dpchip for reasons unknown as yet.

Ill try and do a little more research on them.

Anyone else heard of dpchip? Look much the same as Tunit as they are laptop programable and manually adjustable.

DC:)

Thanks for the explaination powers1.

I thought that most of the units would remap the fuel table rather than just use a fuel pressure hack.

How does the tunit work? Does it remap the fuel table by intercepting the fuel pressure sensor so only the high load parts of the table are modified? Will the standard engine management log any errors about air/fuel ratio that would be obvious at service time?

I have a fair amount of experience building and tuning petrol race engines with Motec and other computers. I've never been a fan of piggy back systems. I havent got my head around the fueling systems of modern diesel engines yet.

Chris.

Ive used Autronic ECU on my recently sold Subaru WRX STI rather than cheaper piggy back systems for similar reasons to you using Motec on cars that you have been associated with.

However diesels are a totally different beast and I think the tuning style module is the obvious choice whilst the vehicle is in warranty.

Contrary to other peoples experiences with remaps, I have first hand experience with Subaru dealers who will only too hapily dob you into the maufacturer to void your warranty.:tsk:

You can alway using a tuning module and then sell it after the warranty period and the money gained can be put to a remap if so desired.

My thoughts.