Broxi

iTrader: (11)

I am about to rebuild my 2.5 and currently it has a set of heads and Cams from a 98 Type-R Fitted, these heads were ported by RCMS a few years ago.

the Engine will have Billet Crank, Wiseco Pistons, Brian Crower Rods, ACL Race Bearings, Cosworth Baffle Plate, Cosworth Oil Pump and 14mm head stud conversion. Cometic Gaskets.

I have a Spare set of 2002 WRX heads, and can source a WR1 inlet if needed, I am also aware that i would need to change the Injectors to side feed, but i will be doing that any way regardless which route i go.

Turbo choice has not been decided yet, but i will probably run the engine in on the TD06 20G

I plan on fitting Stage 3 cams, Supertech Double valve Springs and the Titanium Retainers, and all valves will be replaced too.

My Goal is 550+ so want to ensure i get the heads and cams right 1st time.


Thanks
Derek

P1Drifter

iTrader: (7)

avcs seems the way to go

banny sti

iTrader: (68)

If you go avcs, Lateral cams are an excellent option

Broxi

iTrader: (11)

when u say AVCS heads, i assume u mean fit AVCS Heads with the NON AVCS Cams?

If not then I guess my current Simtec will need to be replaced?

banny sti

iTrader: (68)

You have going for a dog bollocks build, go the whole hog and get a syvecs ecu to control the avcs heads with avcs cams

P1Drifter

iTrader: (7)

simtek can control the avcs, needs to go back for a mod tho

banny sti

iTrader: (68)

Does not have active knock control though

Broxi

iTrader: (11)

I have been happy with the Simtek, but the Knock control is a Concern.

I plan to run 20% meth. I have not looked at the Syvecs, guess i need to look it up.

P1Drifter

iTrader: (7)

it will tho...................someday

banny sti

iTrader: (68)

Thats what I used to think and gave up after 2 years

Broxi

iTrader: (11)

I found these on Ebay, but they have cracking around the spark plug hole, is this an Issue?

http://cgi.ebay.co.uk/Subaru-STI-EJ2...item3a62ea0cca

JdcTypeR

iTrader: (19)

Sorry to butt in matrix but your type r heads, were they machined matched to the 2.5 block? if so do you have any pics of the chambers as i'm doing a build but would like to see what machining needs doing?
Thanks.

Broxi

iTrader: (11)

They are still on the Engine in the Car at present.

When i got the Heads they Came from Tiley Of Bristol of their 2.0 Race Car.

I used the 2.5 Head Gasket and I scribed the underside of the head, to mark the combustion Chamber, and then used grinding stones on the end of the drill, and then the Dremil. after i was happy, i then used the Dremil to polish the Combustion chamber up. as i had the heads on my 2.0 to start with i had them lightly skimmed and Vaccume tested.

I had no issues with the heads after doing this.

JdcTypeR

iTrader: (19)

Thats a shame as i have v4 sti heads off my type r and cant find any pics anywhere of them machined to match and dont want to start doing it until i've seen one already done
Thanks.

banny sti

iTrader: (68)

Generally not an issue and can be repaired, however the guy has them listed on snet for £400....

Broxi

iTrader: (11)

Thanks Banny, I will do a search for his post.

screechy

iTrader: (4)

Just out of interest can you run the AVCS heads as in the ebay ad but without using the AVCS.

By that I mean can you use these heads with a version 4 simtek?

Also would there be any gains over standard v4 sti heads?

banny sti

iTrader: (68)

Yes you can disable the avcs and run without, did this with a version 5 sti running a power fc.

Main benefits of avcs are better spool and more torque, however the RCM car runs version 3 head castings as does Madhammer and both cars are over 700bhp.

MartynJ

Don't let it concern you m8, you have a good mapper

Martyn