Thread: Jwt S4 cams or vvl head ?

I would have to say all being equal, you will make more power with the vvl head than a stock de head with s4's. Get the biggest exhaust housing you can and don't boost 20 psi till you get it sorted. You should be able to hit over 300whp with the ve head on way less than 20 psi. Stock 20vvl cams are bigger on the high lobes than the s4's. Add to that the head flows much better and you will make more power with less boost. You will hit a ceiling effect, but don't let the people theorising scare you. Just do it, run what boost you are safe and happy at and upgrade to a larger turbo later. Someone on here with a t25 on a vvl made 290 something whp and your turbo will outflow that by far. I don't think 330-340 is out of the question on 15-16 psi. That being said, I'd probably run 11-12 psi daily to be safe and be around 300 whp

how about a de head with s4 cams and a intake mani would that flow better than a stock vvl mhead

the vvl head will still flow better. On any given setup the vvl head should make 25-40whp more than the same setup on a de with s4's. A gt2871r is the smallest turbo I would attempt to use on a vvl setup. As mentioned get the largest exhaust housing made for the turbo you have. If you run t2 make it a external gate setup.

I have done about 4 de/ve motors with t-25 kits on them and one at 13-14 psi was at about 312-317 whp and that car was at that level for about two years before he upgraded, my current setup is a t-25 de/ve and I am at 13 psi at 297 whp on a super conservative tune. I would say Vvl has many benefits, and it shows already that even with these tiny turbos that de/s4 cam motors are not making that power at the same boost. I say Vvl head, but I love the s4 idle.

If you are really shooting for 400+whp I would go VE, but the 2871r is a good match for the DE with cams. I think if I were you, I would go that route. DE with cams and that turbo. VE is really good if you have a good setup on a large T3 frame turbo. But even my GT3076r seems to holding the VE back. The GT35R style turbos like the 60-1, SC61 etc will make the VVL come alive big time.

ok got ya ..i am gonna run a external gate to improve that exhaust flow...

future pics of the setup soon......

I would listen to GIO, he is saying the same thing as I am. He has proof to back it up. I Have a few ve-t setups with t2 turbos just experimenting and they do work very well. An external gate would b a great upgrade, but i didn't know if you wanted to go that far. It will get you where you want to be safer and you will sound meaner lol.