83 replies to this topic

[siztenboots]

the noise is really something

[scw02102]

Yeah your right, my brothers got an RS4 and I went to the last RS4 dyno day

 

problem is the engine suffers massive coke problems and a de-coke can see 30-40bhp easily, if the engine has one they make the 414bhp (4.2 V8 factory figures) but most clog up very quickly hence don't make the factory figures. Sounds great though

 

they dont mod well either as teh N/A is already maxed out, but the RS6 is completed different and makes 700bhp with ease

I for some strange reason feel the need for multiple cylnders Having 2nd thoughts on my octavia estate 4x4 tow / family barge new S3 conversion and going all 2.0 TDi and running a 2nd car day to day be that a vx220 with silly engine conversion or something different. Towing and my style of everyday driving and increased fuel costs seem to be costing a lot for a 220bhp octavia RS4 fits no problem - seen it in the engine bay I like turbos though - although the RS4 at high rpm would sound fantasitc in a vx with the roof off Problem with the RS4 lump is it never seems to make the std power output and even with remap tends to only get close - really is a trade of for that noise imo Sure the 1st test drive of Luke tfsi conversion will remind me that you dont need any more than 400bhp in a vx DG

 

[Nev]

What exactly cokes up? The DPF/exhaust cats ?

[techieboy]

Valves. All TFSi engines have a reputation for it.

[Rosssco]

The valves coke up basically because the fuel is injected directly into the cylinder, meaning the valve isn't "cleaned" by the fuel / air mixture as it is drawn in through the open valve. There are a few places that offer a cleaning service..

 

http://www.more-bhp....e_cleaning.html

[siztenboots]

could you just have an extra injector, to occasionally wet the back of the valves

[Winstar]

could you just have an extra injector, to occasionally wet the back of the valves

my question is if the fuel is only injected after the valve closes in a direct injection what is the cause of the build up? CCV?

[fezzasus]

It's from EGR and the PCV. There's an engine test included in VW specifications which looks at it. Mostly relates to base oil quality.

[techieboy]

Yep, PCV and EGR is the culprit.

[Winstar]

Yep, PCV and EGR is the culprit.

There's a fairly obvious answer to the problem then, or is it locked into the ECU calibration?

[Gedi]

If it looks like this when it's done, I'll wet my pants

 

[Rosssco]

It seems to have a reasonably advanced PCV system and oil separator (presume Audi predicted such problems!) - Page 9

 

http://www.s4-mtm.co...-StudyGuide.pdf

 

 

[fezzasus]

 

Yep, PCV and EGR is the culprit.

There's a fairly obvious answer to the problem then, or is it locked into the ECU calibration?

 

 

Using oils with MB 229.51 claims in addition to the VW claims will also help significantly.

[OneYet]

Clam being modified. 

http://rejsa.nu/foru...r=asc&start=525

[Nev]

Just took another look at that thread, that has to be one the boldest VX220 conversion of any sort surely? Amazing.

[techieboy]

Definitely very bold. It was an Exige.

[Rosssco]

Guess the final weight competition

 

Rosssco - 1,050kg

[fezzasus]

I'm going to say higher. 1150 kg. There's a lot of steel in the back, heavy suspension, lots of fibreglass going on to the rear clam.

[JG]

Exige S3 (V6) is 1150kg so it could be even more.

[jonnyboy]

I'm going to say higher. 1150 kg. There's a lot of steel in the back, heavy suspension, lots of fibreglass going on to the rear clam.

Not far off I reckon