300 tdi power chip

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i think he has a td5 anyway, thats a whole different ball game, any one can get a td5 chiped.

the only 300's that can be chiped are the auto's so not that many about and not many companies can be bothered with all the unsoldering and resoldering that has to be done.

A td5 is just plugged into the computer and thats it job done
 
Like I said in my first post, the best way to improve a 300Tdi auto is to sell it and get a proppa gearbox version. The auto box Disco's at best are a means of transport without having to change gears, but no matter what you do to them they are crap.
And like others have said, when you do a Google all manner of **** pops up.
Happy motoring though eh!! :D
 
Suris said:
Like I said in my first post, the best way to improve a 300Tdi auto is to sell it and get a proppa gearbox version. The auto box Disco's at best are a means of transport without having to change gears, but no matter what you do to them they are crap.
And like others have said, when you do a Google all manner of **** pops up.
Happy motoring though eh!! :D
Click to expand...

thanks for the constructive comments but some of us like to off road a bit and its a well known fact that the auto is better for off roading.
 
Did he really mean to say "re-ponce" , instead of "re-sponse" ? Or was it a 'convenient' keyboard malfunction ? I like to believe the former....cos its funnier :D

anyway,auto are a better towcar and do a good job offroad...the only thing that keeps them off the road more than a manual (and remember I own,and have owned many of,both) is the EDC problems that come with age.

Another area where the auto scores is for some of us that have got ourselves disabled and find it hard to drive clutches.By no means are autos to be discounted out of hand.

Anyway,even with the EDC autos,try pinning down a company to just WHAT they are going to do to it.Better off doing the maintainance and then putting a Td5 intercooler in and any relavent adjustments to match.
 
I had an alisport plug in chip (connects to black lead inside fusebox similar to rs232 pritner connection) for my 300tdi EDC auto P reg

It made a hell of a difference to pickup. Fuel economy didnt really change. Wasnt cheap either

Now here is the rub

On kickdown or when booting it created a almost james bond smoke screen out the back. With the chip unplugged just usual amount a muck out of the exhaust.

By the time I drove back to Shropshire from Alisport it was making an odd noise. Looked at my turbo and there is like a flat disc fitted almost like a core plug. This had been pushed out. Got hold of a new one refitted it and same thing happend next time I was on the motorway.

Took it to what used to be 7 valley motorsport they reckoned it was overfuelling the engine too much causing the exhuast gas temps to get very hot. Not sure if it was pressure or the turbo getting too hot that caused the plug to keep coming out. Anyway soon as I removed the chip the plug never fell out again.

I think if you want a chip always go for something mapped or made to suit your needs and vehicle (taking into account age etc). I learnt an expenisve lesson by just going for something plug and play. Luckily I didnt get any engine damage.
 
I think the injection pump on the auto is a Bosch VP37 (can anyone confirm this?) if this is so then it has a very simple electronic control. The pump ecu sends a voltage to the pump which controls the travel of the piston and therefore the amount of fuel being sent to the injectors. This voltage is in no way calibrated to the pump so from just this signal there is no way of knowing exactly how much fuel is being injected. The fuel pump returns a signal to the ecu in the form of an ac waveform which corresponds to how far the piston travels which the ecu then reads and can adjust its output to the pump to get the return signal it wants for any given throttle position.

This is a closed loop system just like when a petrol car uses the signal from the lambda sensor in the exhaust to adjust the pulse length of the signal to the injectors.

This system has the advantage over a fully mechanical system in that the ecu can adjust the amount of fuel injected dependant on a number of sensors like air temperature, air flow, manifold pressure and anything else they care to measure and throw in allowing more fuel to be injected if there is enough air to burn it and the engine is at the right temperature so as not to determent reliability so can therefore produce more power than a mechanical pumped engine which has to be tuned for the worst case scenario.

On the other hand they could just use a very simple ecu attached to the throttle box and might have only very simple compensation for air temperature or manifold pressure.

There are a couple of chips available for cars with this ecu but there is also a very cheap and easy mod you can do to yourself. This started off as just wiring a 1K ohm resistor between the return signal from the fuel pump and ground to reduce this signal and trick the ecu into increasing its output giving more power but can cause problems as every car is different, on some it will have little effect but on others it has to much effect and produce loads of smoke and can cause ecu errors. Members of the VW TDi forum have done a lot of work and came up with a much better circuit which can be adjusted and switched on and off.

Here is the circuit

Latching_relay_Evry.jpg


And this is the rather long thread on the VW TDi forum

Champagne performance on a beer budget - TDIClub Forums

To my mind as long as you are sensible and don’t try for massive power then this shouldn’t cause any harm and will be just as good if not better than any chip. I fitted it to my BMW and was very happy with it.

There were a lot of eBay ads and quite a few companies selling tuning boxes which turned out to be just a 2p resistor in a box for £80 odds.

 
DISCOVERY1-DAZ said:
That looks like a brilliant mod for the edc engined 300tdi !
Just needs someone to make 1 and try it out!!! :)
Click to expand...

We were playing about with a VW Golf with a similar principle..... it works well. It is essentially what is inside these sub £100 "tuning" boxes that you buy from the internet.
 
you don't need all that stuff, a 1k ohm resistor attached to the red and green pink ( i think) under the dash, put a switch in so you can turn it off.

the info is on here some where, do a search.

I have seen it done and it makes a lot of differance
 
Last edited:
hifly said:
you don't need all that stuff, a 1k ohm resistor attached to the red and orange white ( i think) under the dash, put a switch in so you can turn it off.

the info is on here some where, do a search.

I have seen it done and it makes a lot of differance
Click to expand...

Where? I need some help to sort one out! Any help much appreciated:)


DD
 
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