After several conversations with people in the know yesterday, I learned that VAG have modified the design of the TFSi engine and that the new variants coming out will no longer have the camshaft driven fuel pump. Some of these engines are already in the UK and the result of the fuel delivery being improved is better efficiency on the engine among other things.
I wonder if the 2009 FR and Cupra will have this engine fitted instead of the BWA/BWJ code?
In addition, with regard to the issue of cam lobe wear, it turns out there is a follower which connects to the fuel pump in side the engine. The earlier US GTis had a slightly different camshaft design, and the follower which starts as black in colour, we found to be wearing, and as a result turning silver. Left alone, this will wear through and then start wear on the camshaft, hence the engine wear. This could develop on newer TFSi engines so attention needs to be given to this part of the engine it seems.
It has been suggested that the pump be removed periodically to inpsect the follower beside the camshaft for wear and if it is anything other than black, that it be replaced (cost is £18).
Further, with regard to the fuel pump upgrades available where the internals are swapped for uprated equivalents, a lot of care needs to be taken when taking off the original pump, fitting the new internals and refitting it to the car as the tolerances in the assembly are so close. Also if not refitted correctly on to the engine, the camshaft may be in line for a good bit of damage. For those looking to do this modification, you need to be careful, or think about a prebuilt pump from the likes of APR for apprx £800.
Also, with regard to fuel delivery and remaps, it seems that tuners codes are being written to adjust boost to counter the lack of actual fuel pressure vs required as on tuned cars, 125Bar of fuel can be requested but actual fuel pressure is 90 Bar or so. 80 Bar or less will see the fuel cuts come in that some have been getting. The net result of all this is that the car is not making use of the potential it has down to a fuel shortage. With the uprated pump on mapped cars, the areas where fuelling is short by 33% or so will see a marked improvement in that area of the rev range down to better fuelling. In addition, the pump is better able to deliver the 130Bar that is needed for stage 2 code. In addition to this, an uprated pump on standard code will work with no problems and as it uses the standard pump casing it has OEM appearance.
By all accounts, it seems that the pump upgrade is potentially worthwhile so wear can be assessed on the cam, fuel shortage can be addressed and a stronger remap applied.
Food for thought.
I wonder if the 2009 FR and Cupra will have this engine fitted instead of the BWA/BWJ code?
In addition, with regard to the issue of cam lobe wear, it turns out there is a follower which connects to the fuel pump in side the engine. The earlier US GTis had a slightly different camshaft design, and the follower which starts as black in colour, we found to be wearing, and as a result turning silver. Left alone, this will wear through and then start wear on the camshaft, hence the engine wear. This could develop on newer TFSi engines so attention needs to be given to this part of the engine it seems.
It has been suggested that the pump be removed periodically to inpsect the follower beside the camshaft for wear and if it is anything other than black, that it be replaced (cost is £18).
Further, with regard to the fuel pump upgrades available where the internals are swapped for uprated equivalents, a lot of care needs to be taken when taking off the original pump, fitting the new internals and refitting it to the car as the tolerances in the assembly are so close. Also if not refitted correctly on to the engine, the camshaft may be in line for a good bit of damage. For those looking to do this modification, you need to be careful, or think about a prebuilt pump from the likes of APR for apprx £800.
Also, with regard to fuel delivery and remaps, it seems that tuners codes are being written to adjust boost to counter the lack of actual fuel pressure vs required as on tuned cars, 125Bar of fuel can be requested but actual fuel pressure is 90 Bar or so. 80 Bar or less will see the fuel cuts come in that some have been getting. The net result of all this is that the car is not making use of the potential it has down to a fuel shortage. With the uprated pump on mapped cars, the areas where fuelling is short by 33% or so will see a marked improvement in that area of the rev range down to better fuelling. In addition, the pump is better able to deliver the 130Bar that is needed for stage 2 code. In addition to this, an uprated pump on standard code will work with no problems and as it uses the standard pump casing it has OEM appearance.
By all accounts, it seems that the pump upgrade is potentially worthwhile so wear can be assessed on the cam, fuel shortage can be addressed and a stronger remap applied.
Food for thought.
