OK ive only been using this forum 4 a couple of weeks now but it seems to me that everyone on here is passionate about there RSs and most of u are well informed on most things , which is why im asking this question ! as some of u know im rebuilding my car after the latest disaster but it seems that some of the things that i bought and had done were a little impracticle , the spec so far:-
lightend and balanced flywheel
shot peend rods
lightend and balanced crank
1mm oversize low comp pistons with xtra machined off for valve clearance and lower comp
fully ported and polished 4x4 head with matching inlet and exhaust manifolds
bd10 and bd14 cams
new stem seals and followers etc
vernier pullys
grey injectors
alcon semi synth clutch
baily breather
swirl pot header tank
pace rs 500 intercooler
pace 3 core rad
t34 stage 3 hybrid
-31 actuator
3 bar map sensor
all silicon hoses with micalor clips
baily turbo damper


im gna go for a 200 block and i was using arp studs n bolts
im using ally grp a engine and gearbox mounts.


ive learnd that the arp bolts arent a good idea and the 1mm overising is also not good ! agree or disagree ?

im using standard management with a live mapped chip
im also using a straight thru scorpion system
im gna get the block wire rung and use a grp a gasket unless everyone thinks a wrc one is better (obviosly without the wire rings )

ADVISE me as if u were building ur own car guys coz i wanna get it spot on this time
By the way im aiming for around 450 brake ???

 

ditch the pistons and use standard bore and standard headbolts on 200 block

 

i think you will struggle to get over 400 genuine bhp on a t34 aswell

 

i think 400 is achevable eith that turbo (but only just)
if you can afford it, new 200 block, new standard pistons like mark said.

but dont wire ring the block, its not worth the hassel. just use standard headbolts with a cometic multi layer head gasket! is capable of holding it together at a much higher spec than you are going

if you can afford it you should be ok with those pistons, i have a mate running 400bhp on 1mm oversize and he aint had any problems, yet anyway

 

I pretty much concur with what these two fella's have said

I will add though that the fuel and spark settings must be checked again, even if the spec is theoretically identical to what it was.

Also pay attention to the fuel pump and regulator and add some NGK 9s to the shopping list.

 

cheers stu , i forgot to add ive allready got a grp a fuel pump and grp a coil and im pretty sure its got NGKs in it allready .
im surprised u thinkthe turbo aint gna be man enuff , its foookin huuuge and pushes out over 40psi when turnd up ! and it aint been wound rite up yet !
are u sure the wrc gasket is better than a grp a with wire rings ?
the car was pushing out 420 brake on the rollers b4 it split and the bloke mapping it told me as everything was new he didnt wanna turn it up any more till id done at least 3000 miles in it , was he bullshitting or was he being genuine ?

 

40psi

Thats not gonna last long, are you sure it's not a t4 even then that's a lot of boost and i'm not surprised it went tit's up.

For 450bhp mate it'd have to be a t4 i'd also check your intercooler as pace items are known to be not brilliant and at that pressure i'd be surprised if it was still ok.
Anyway if it was mine, 200 block with standard bore low comp pistons and wrc gasket.

oh and standard head bolts.

PJay

 

oh poo !!
i didnt realise id put 34 , ur right it is a t4 , stg 3
i wasnt runnin @ 40 psi , it was only pushin out 26 when it went bang . i just meant to say it has been wound out to 40 psi but put straight back when it started popping and banging , the bloke said it was "blowing the spark out from the plugs " so when its all done its gna want setting up properly , whos the best person to use
i allways swore by power engineering but the best guy isnt there any more and it seems they are concentrating more on the jap crap side of things now !!

 

daddy cool, i think that guys rolling road must be over reading or somin!
what housing do you have on your turbo, .48, .68 etc?

both the wrc and the cometic head gaskets are virtually the same but the cometic is half the price so i would go for that one.

if you have the cash then by all means go for the 200.

Do not wire ring the block! its not bloody worth it cause if it aint machined perfect or the wire isn’t sat in with no join line then you will have a weak point and pop goes the weasel!
and if you are running that stupid amount of boost which i doubt you ever will then you definatly need the multi layer type gasket not the grp a!

were you running the bd10 and 14 cams when you got this 450bhp figure?

 

t4
i was guna say!

mine is on 24psi and gives around 345bhp so i doubt that 450 is accurate for 26psi.

 

all i know is what the rollers were saying ! i couldnt say if they were rite or not cos i havnt driven any other cars with that many horses ,i do know tho that it was shitloads quicker than when it was at 350 brake , and im pretty sure the rollers at power engineering are close! i mean i was 4 up the night i got it back and it was bone dry and 1st 2nd and 3rd it had no traction whatsoever i had to keep feathering the power in at 70 mph cos it just wouldnt bite the road ! i was seriosly happy with it , specially when a friend of mine who has a car tuned by M,A,D to approx 360 brake wanted to play ! it was like racing an xr3i ! i kid u not ! didnt last long tho !!

 

Agree with the above statements ie:
200 block on standard bore size
Cometics 3 layer gasket
I would choose long studs over standard head bolts though, just my opinium
HTH

 

A T4 at 26psi will generally make Circa 390-400 horsepower.

Add cams and head work and you can approach the magic 440.

4 greys are running out of capacity FAST at this level without resorting to increased fuel pressure.

I wrote a HUGE essay in laymans terms somewhere on here to explain why this is so....

 

mmm didnt think you couls see that sort of power from 26 psi

ah well you learn somethin new every day

 

Il find the post for ya and BTTT it Daz, see if it helps you at all?

 

nice one, cheers stu

il tell ya, not gunna name names but i really do wonder about what my local cosworth specilist tells me sometimes

 

Here:
Youve made me get off my ass and start sortin this essay archive forum out:

http://passionford.webheberg.com/for...forum.php?f=56

Hope this helps... appologies for the very simple laymans terms used, i wanted it to appeal to everyone

 

nice one, yea its simple but very informative, thanks