No need to lower the CR for the sort of boost needed for the power on a .48, the point is you don't want to lower the CR as this is what gives it better off boost ability.
Oddly enough plenty of 500+ cars on group a gaskets, without any problem, and ones that are raced as well.
Get a mountune ?, NEWSFLASH, mountune DON'T make gaskets they buy them in, where from ?(I know).
Victor Reinz do a single layer steel headgasket as well for the YB.
tabetha

 

Where did you buy your wrc gasket from m8 ?

 

exhaust cam is good for nigh on 700bhp in standard form

 

I did 358 bhp on my old t34.48

 

regarding CR is depends who you speek to, and if your getting it "live mapped" or a off shelf chip,

for example, one of our t34.48 chips on light blues has a high ish 7:1 CR, so if you wanted one of our chips you do need to change CR

 

It's determined by how much boost you need to run due to the size of the turbo, versus CR, ie if using a larger turbo you can get away with higher CR as will be less boost for same power as smaller one running harder.
I certainly wouldn't change it at this power level, and know many that have been mapped with std CR in excess of this.
I would never use a off the shelf chip, but only on a basis to get run in or while saving for mapping session, the effects of the mapping session are just too great not to do it.
I just done 130 miles on £20, and it certainly wasn't slow either, not a hope in hell of that with the chips I had, I have 0.97% CO at idle WITHOUT closed loop, and idle is so smooth, low speed running is perfection, this is with a 170,000+ miles bottom end.
It's all rigged up for CL, everything is there, had it on, couldn't see any difference, will take off and sell when I remember!!
tabetha

 

my point is, for other people reading who would not like a live map that you cannot spec your engine and hope for a shelf chip, the engine has to be done after the chip is choosen/to the chips spec,

 

right right right.... cheers peeps

Hang on, so if my headgasket goes? shall i replace it with a victor rienz gasket? a norm group a, or wrc?

 

they must have came down in price as mine was 400 from mountune

 

It was already on car when i bought it but I believe it was supplied from A1 rallysport as thats where all the head and engine work was carried out.

 

my pulled 388/375lbft on a .48 on the dyno at scs which is superb would recommend it to anyone.

 

wrc thens?

 

Some mental power figures on a .48, i thought they were on their arse at 360 and a .63 at around 380 ??

 

Thats what i thought

 

what will a 380bhp .63 be like on stock lattices?would it have no traction all through 2nd?

 

why dont you have a more responsive 380 bhp on a .48 ?

 

i get 32 psi spike holds 28 out of my t34.48 but now 1 ever believes me

 

j1mbo how do i get 380 on a .48 what will the boost come in like

I want it to feel like a sledge hammer in the ass lol shal i use a .63 or .48

 

jimbo no"s my motor as its scs spec and on .48 it has a 2bar spike and holds 26psi all the way to 7200rpm and yes it comes on boost hard and leaves 2 black lines coming of roundabouts!

 

whats your spec then

like i say i want the boost to push me in the seat i wanna feel it

 

200 block
wrc h/gasket
lowered c/r
4x4 head
bd10 inlet cam
std ex cam
t34 .48
400 injectors
70mm i/cooler
2wd ex manifold
4x4 inlet manifold
scs chip
as said pulls rather aggresive and comes on boost at 2.5k all the way to 7.2k..very nice!
std cams will make 400hp but with an inlet cam in they seem to make the power all the way up the rev range rather then peaking at like 6k etc

 

cool spec nothing like mine lol

mines
205 block std cr
2wd everything
std cams
t34 .48 and have .63
500 cooler
dark greens
group A hg
3 bar
L6
havent got chip yet as i dont know what ex hsg to use lol
and dont know if i need to change anything else lol

 

any 1 know what power i can get on my spec with each ex hsg and what will it be like to drive last time i drove it it was a stage 1 so will be fun however lol

 

Don't be fooled into thinking a t34.48 is sooo responsive you can't really 'feel it'... they make awesome punchy fast road cars, and unless a definite goal of 400+bhp is aimed for (if you're into chasing numbers in the first place) the i'd choose a .48 all day long...

...my last Sapphire was pretty much stock on a t34.48 and 803s and after having a custom map by Karl it ran beautifully and was ballistic in everyday use, with so much more low-down grunt than a .63 equivalent car.

 

Look at my spec mate what i want is some thing that will hit hard not worried about hittin 400 bhp yet stage 3 will be enough for me for now i want it to feel like my old s1 when then came on boost all hell broke loose

 

Seriously.. you guys are bastards, im now as confused as barry on a .48 to .63!.. my old ct9 turbo on my gt was Shit, came in so early it felt like a 106 gti.. td04 was another story.. lag lag lag till 4k.. then BANG and whaled you back into your seat.

I dont want something which comes in half way... nothing nothing nothing BANG etc... So a .63 must be for me?

205 block
wrc h/gasket
2wd head
std inlet cam
std ex cam
t34 .48
403 injectors
70mm i/cooler
2wd ex manifold
4x4 inlet manifold
msd live map
grp a coil

im confused... i need to go in a cossie

if i was to give someone some petrol dollar, would they take me for a 2-5 min blast in their 2wd saph/sierra at all?

 

agree with the top there 100%

as for your questions,
head work, cams are a deffinate

 

stick an inlet cam, set of bigger injectors as the greens arnt going to keep up with a t34 on full chat, chip and your pretty much sorted, i would stick with the 48 too,

 

Seriously.. you guys are bastards, im now as confused as barry on a .48 to .63!.. my old ct9 turbo on my gt was Shit, came in so early it felt like a 106 gti.. td04 was another story.. lag lag lag till 4k.. then BANG and whaled you back into your seat.

I dont want something which comes in half way... nothing nothing nothing BANG etc... So a .63 must be for me?

The 63 will lag more than the 48

 

yea, and has more lag and will come in with a more aggresive kick surely?

 

Scary quick

Once the old girl spools up

But as all above depends on the specs of your car

 

right cossies are new to me so what inlet cam do i need mate

will the turbo come in with a bang? on the .48

 

Im kinda new also mate, it seems you would be best off weith a bd10 iirc? and i can imagine the .48 will come in with a kick, but will be progressive and come in earlier in the rev range.

iI personally like lag lag lag then when it comes in with a bang it makes the rears loose traction

 

So whats the max i could get with a live map?

Spec would be 4x4 engine, with a worked head on standard valves, standard exhaust cam, BD14 inlet, Low comp (not confirmed but think its 7.2:1) RS500 cooler, RS500 inlet manifold, choice of either 2wd or 4x4 exhaust manifold and a t35 .63.

If i could make a reliable 400bhp on that spec i'd be happy.

 

you should see 400 on that spec mate

 

im gonna save money.. get a evolution chip and setup by stu, live map will be too much compared wont it?

 

To be honest, by the time you add closed loop on, you are getting close to the price of a live map! I'd get a live map personally.

 

As above .

 

quite an interesting read this thread.. But can't help noticeing that everyone is going on about .48 and .63... Yet no one has mentioned a T34. .55ex ...Any particular reason

 

What AFR was that on the dyno? 12.6 ish I assume?
And what AFR will it run in the car?