It was just so the OP wasnt led astray by thinking he could shove all that power into a standard 2.5 casing and get away with it.

 

What heads and cams have you got on that car banny?

 

Ported VVT heads and lateral cams

This is a forged 2.5 with standard sti 5 heads and a MD321T+

 

Just goes to show how quickly mine spools up. I dont think I'll change my cams now

 

Heres mines, built 2.5 with sti4 heads and S206 turbo. Rev limit is set 7.5k

 

Banny, we all know the 2.5 can rev



but I don't think that the OP wants to go that extent.

 

That car was written off pretty recently

 

Not quite! it's coming back soon, having been repaired.

 

A friend bidded on the car but it ended up going for a little more than he was willing to spend, look forward to seeing it back to full glory

 

im going semi forged (just pistons) 2.5

with sc46
simtek ect

hopefully be fairly quick with good torqe

would like it a bit over 400bhp

plenty for my use

 

Re 2.1/2.5 we say you can get a better result from a 2.1 if you aren't going to the extent of cam and head work. 567 bhp from stock heads and cams?
Bargain..

 

Alan,
At what stage would you recommend head work? What's the max power you *should* easily see from STI8 VVT heads, without doing much work to them?

 

since were all posting graphs up,heres mine.

enginetuner 2.1,and yes it does exactly what it says on the tin.

 

Martyn, i have a v4 sti type r

 

I'd say it's the 567 bhp we ended up with! Of course you need the right turbo and bits to go with it.

 

I see. So the VVT heads should see well over 500bhp as standard, as long as you have a 500+ turbo, plus supporting mods.

 

No not to that extreme...... at the moment

 

Its sounding like the 2.1 at the moment then but i would like to hear from people who have the 2.35

 

Enginetuner rebuilt my sti ra version 2 heads using standard valves when i brought a 2.1 off them and im getting 480bhp and 450 torque

 

if I had a chance to do it again on a classic it would be a 2.3 if it was a newage I would go 2.1 with avcs. not taking anything away from a 2.5 as I loved my 2.5 and yes they do rev very well

 

double post

 

triple post bloody iPhone

 

Over 150bhp more than mine. Yet strangely torque is identical.

What fuel was that on Arf?

 

Nothing strange about it Daz, it does have over 500lbft for near as dammit 2000rpm.
Fuel was VPower and 20% meth.

 

as martyn says 20% meth with vpower and thats only at 2bar.the pull from the torque is unbeleivable to say its only a 2.1 and when that starts to tail off the bhp just keeps going and going.the main thing for me though is the reliabilaty of it,up to now it has proved to be rock solid even at that power and thats what means the most to me.

 

Thanks for the info. I'm just trying to find enough info so I can decide whether i want uprated cams or not. However i dont want to lose my spool up which is full boost from a GT35R Billet at <4000rpm. I Love the way the car drives now.

 

It is possible that your standard cams are beginning to hold you back at that level Daz.
We are shortly going to try a turbo swap on this one currently running a .63 GT35R.



We are going to try an SC35R Billet with a .82 housing and are hoping for similar spool but better top end. We have mentioned to the owner that his stock heads and cams may be a limiting factor to outright output, but don't want to lose too much in the midrange.

Martyn

 

That's exactly what has happened. It wont take anymore timing and more boost doesnt make any difference. We're going to try some race fuel but the gut feeling is that cams are stopping play. Do you have any graphs of 2.5/ avcs heads /35R and the cosworth S2 cams anywhere for comparison Martyn?

 

This is one of the only graphs I have when mine was mapped by Paul on my 2.5ltr block, this was at 1.6bar as the injectors maxed out at 5500rpm. It was on my normal GT35 with .63 housing. It wouldof been nice to see what it was like when it was mapped to 2.2bar but I never got one.

 

As if by magic, lol.



This one has the Cosworth CNC heads aswell as the valvetrain.