ImaRacing 700

....what is in your opinion the highest bhp figure IF you put a std port size head on a cossie with a GT35?..Are you limited to a certain BHP?

Stu @ M Developments

iTrader: (12)

LOL..
Karl and i were going to find this out once upon a time just for the sake of science.

Then we considered the ancillaries the failure could destroy and opened another beer instead...

ImaRacing 700

Stu i know.....but say you had wild cams etc all the fuelling the only thing std the port sizes..educated guess?

Karl

surge surge surge surgeville!

ECU Monitor Enthusiast

iTrader: (1)

I have seen an engine with a reliable 415bhp on a standard head/engine with a T4 turbo.
The engine had a 4x4 inlet manifold, a 2WD exhaust manifold and had 700cc injectors.
Standard cams.
Ran 2.2 bar and the power limit was capped because of the det limit on the relatively
high compression ratio of 8.0:1


Dont think there was much more to come even if the CR was lowered.


(this is NOT my engine before anyone says)


EDITED TO SAY standard cams !!!

Stavros

Youl max out the turbo before you max out the head ports

ImaRacing 700

Yes obvious surge but would that clear or just remain full stop?

Stavros

With the largest ex housing i cant see there being a real surge problem, esp not if you can use whatever cams you want

Karl

With std head ports GT35's tend to surge at all boost levels at part throttle and at full throttle anything over 20psi. They surge badly from 4.5K through to around 6.5K and then tend to clear but go near 30psi and the surge comes back with a vengeance!!!

Don't know the exact power figure as it was done in vehicle but from the fuel map and boost I ran I'd say well over 450bhp.

(Std head with BD14's fitted BTW GT35 with both 0.63 and 0.82 ex housings tested)

Rick

with big zorst housings ur just delaying the boost - surely ud better just map it out if the sole intention is to reduce surge.

ImaRacing 700

Karl...what about a 1.06 housing...is steve right?

Port sizes interest at the mo

Karl

Phil,

Yes I tested the 1.06 exhaust housing and I've not mentioned it for very good reasons.

I'll leave you to find out for yourself as Ive divuldged more than enough info.

Suffice to say the std cossie head is SHITE!!!

ImaRacing 700

Does the larger housing increase surge or decrease Karl?

Rick

i know

pity i dont have a YB

I'll bolt one to Linsay's new head and see what happens

Karl

Phil it decreases it but mainly because the turbo can't produce boost until over 5000rpm so it can't actually surge until then!!! ROFLOL

CozzyBrom

talking of heads hows the shimming coming along karlos

ImaRacing 700

LOL.........

So is 650bhp possible on

23mm
24mm
25mm
26mm

Port size?..and does exhaust have to match the inlet?

Stu.H

Off topic: Karl, have you had chance to look at my email?

ECU Monitor Enthusiast

iTrader: (1)

Phil,
why are you not asking your "prefered tuner" instead of someone you have publically dissed on many occasions

ImaRacing 700

someone fart

Karl

StuH, no mate not yet just going through this weeks email at mo hence on this site too.

Brom, started mate, hopefully be finished tomorrow but at latest monday next week.

Ima, I'm sorry mate but it is'nt as simple as saying that. Cams and manifolds play a big part too so it needs to be a balanced specification built for each application.

ImaRacing 700

SECS...you fail to understand that the me and karl situation like the me and stu situation is just net banter...YOU however is different you are a "proper" c**t..so go fuck yourself ROFL

Ok Karl....intersting so are you saying on a YB with 23mm ports by using certain cams you could get big bhp or are port sizes vital?

Karl

Phil,

By using the correct turbo and cams on a 23mm port engine you could get excellent results.

With regard to breaking 600bhp with a GT35, not on anything under 25mm.

CossieRich

iTrader: (1)

Whata re the standard port sizes on a cossie head?

ECU Monitor Enthusiast

iTrader: (1)

So we are back to DIY then

ImaRacing 700

No ......as most normal people know i ask everyones advice and make my own decisions...i doubt Mark finds that disrespectful....at the end of the day i am just a loud mouthed tosspot....who does good bosch deals to the genuine trade and occasional private person if i like em

Anonymous

Phil i got a dremel and a tape measure you can borrow mate