[Mk2] [Turbo] Information request - Rev 2 vs Rev 3 head - Real world advantage?

[ashley]

Sounds very interesting, always keen to see real data.

I'm planning to build a new head for my motor if I can get hold of a beams head...struggling to find anyone who wants to sell just a head though

[gavinda]

I have a beams head here also, not flow tested it yet but it has great port angle and port. The beams head is a much more expensive proposition given its rarity and fundamental differences tho.

[mrdb]

Some actual test data

[mrdb]

more power from rev3 is almost totally down to beter stock cams/manifold/turbo/ecu and a bit more boost.

The actual rev3 head has little advantage and is actually a bit worse in some respects.

Rev2 engines also seem to make more touque.

TVIS can be left in use well into 500bhp its activation point just needs altering.

[Danbob]

Thanks for this info!

I am keen to keep TVIS and I don't need 500hp, so as I have a spare Rev 2 head I think that my best bet is to find a cheap Rev 3 NA head and steal the cams and buckets from it, then find a CT20B


That way I can start working straight away on the spare head and inlet mani without shelling out any money until necessary


Cheers
Dan

[mrfil13]

Regarding the tvis activation point. I have an led connected to the tvis pin on the ecu.

Going by the led. The ports are open after 2500rpm and do not close until you drop below 2000rpm.