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Old February 6th, 2017, 06:11   #93
Veteran Member
Join Date: Dec 2006
Location: Belgium

Originally Posted by shortysclimbin View Post
Two years ago I ran into the same issues. I actually sold my performance cams, ported, head, dual valve springs, and custom valves last year to a guy in the usa.

Some helpful info maybe:

1) the v6 3.0l TDI CR motors have valves that are about 3mm larger in diameter than oem and same dimensions. they are also sodium filled! I'd suggest running those and just changing the slope angle and valve seat angles on them to fit your needs.

2) the oem intake valve ports split the air and have a very very aggressive reflow swirl built into one of the intakes for low RPM swirl and emissions. Removal of that will drastically help higher RPM but may mean more emissions on lower RPMs. Since you have a good tuner who isn't minding to tinker with new things, (unlike our USA tuners). I'd suggest you keep the intake flapper valves and use the controls to flow more at lower RPM through the single swirl valves that are like the MK4 VE heads. Those intake tracks I'd suggest to only clean them up and worry about the valve seat angles at first! By doing this you will drive a large volume of air at lower rpm to the swirl ports and you can take the old swirl ports and create them into straight feed valves like gas cars for higher RPM. Watch your flow ratios though to make sure you don't kill the swirl and 80% intake to exhaust flow ratio.

3) The cams which have been tested as drop in were used on stock heads. I suspect the flow ports in the head design are actually the limiting factors. Cams on top of a good port job may drastically increase your power potential at higher rpm if you can keep your fuel pressures up in the rail.

4) with the CP3 we were still seeing some fuel rail pressure drops. This was resolved by replacing the stock engine bay electric fuel pump with a heavy duty diesel one that the flows 3 times more pressure.

5) watch that transmission 4/5 gear spread. at the ~390ftlb these manuals have a tendency to walk the gears apart on the 02S transmissions. you might want to get that brace in there if it isn't there already.
Id be happy to hear valve pn and engine code from this v6 engine with 3mm bigger valves. Last time I checked valves where larger, but less than one mm
'99 Black Ibiza GT90: 2260v, ARL bottomend, rosten rods 81mm slugs, 17:1 CR, 35/38mm exh/in valves, 02M, 305mm discs with Brembo calipers, OZ Superturismo 16"x7.5J, .............
Dyno'd area, Old VNT20 setup dyno'd 192whp
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