Seano
25-07-2006, 12:06 PM
Hey there
Lurking around on the UK T4 Forum http://vwt4.forumsplace.com/message2936.html has turned an interesting engine mod that seems a little too good to be true and I'd be curious to hear what you all think.
The mod refers at this stage to the 5cyl 2.5 TDi motor from the later T4s. The simplest application occurs in the 75kW ACV motor that is pretty common in Oz after about 2000.
Basically the mod consists of the replacement of the stock injector nozzles with the injector nozzles used in the 110kW TDi motor from the long nose T4 (a model we didn't see in Oz?) which has the front mounted intercooler. The main difference between the two nozzles is the internal diameter - the 110kW nozzles are larger.
Once the nozzles are fitted then the fuel flow at idle is adjusted and away you go. The person who fitted this mod claimed a 40% increase in power on the dyno straight away. However, the vehicle ECU was then remapped on the dyno which resulted in another power increase........the proponents suggested that the final result was about a 50% increase in power output in the ACV motor, no idea on torque...
In every other way this vehicle appears to be stock. No extra air in or out, same intercooler etc.
Not surprisingly I'd be quite interested in this mod as bang for buck appears to be quite solid over the normal 'insert chip here' routine.
However, I'm aware that nothing comes for free. And my main concern here would be the impact of the mod on typical engine operation parameters such as temperature......or does the remap process remediate these concerns by balancing and controlling the extra fuel delivery capacity?
What do you lot think?
Lurking around on the UK T4 Forum http://vwt4.forumsplace.com/message2936.html has turned an interesting engine mod that seems a little too good to be true and I'd be curious to hear what you all think.
The mod refers at this stage to the 5cyl 2.5 TDi motor from the later T4s. The simplest application occurs in the 75kW ACV motor that is pretty common in Oz after about 2000.
Basically the mod consists of the replacement of the stock injector nozzles with the injector nozzles used in the 110kW TDi motor from the long nose T4 (a model we didn't see in Oz?) which has the front mounted intercooler. The main difference between the two nozzles is the internal diameter - the 110kW nozzles are larger.
Once the nozzles are fitted then the fuel flow at idle is adjusted and away you go. The person who fitted this mod claimed a 40% increase in power on the dyno straight away. However, the vehicle ECU was then remapped on the dyno which resulted in another power increase........the proponents suggested that the final result was about a 50% increase in power output in the ACV motor, no idea on torque...
In every other way this vehicle appears to be stock. No extra air in or out, same intercooler etc.
Not surprisingly I'd be quite interested in this mod as bang for buck appears to be quite solid over the normal 'insert chip here' routine.
However, I'm aware that nothing comes for free. And my main concern here would be the impact of the mod on typical engine operation parameters such as temperature......or does the remap process remediate these concerns by balancing and controlling the extra fuel delivery capacity?
What do you lot think?