cozzie4d

Hi There.
As I'm gonna rebuild my engine soon, I'm thinking about a new and bigger turbo then the current t03 I was using till now.

Can someone explain to me what the advantages and disadvantages are when using a:

T34, T35, T38, T40

I know that most of the time, how bigger the turbo, how bigger the lag, is this true, and is there something to do about the lag.

The engine I'm planning to build has the following specs:
- new oversized (+1mm) low comp Mahle or Cosworth pistons
- most likely my current 205 block (bored) with the current crankshaft
(offcourse balanced and grinded/refaced)
- arp studkit for the crankshaft
- all bearings new
- new oversized piston rings
- new 4-layer WRC headgasket with standard bolts
- rebuild cilinderhead (which is 1mm under minimum thickness after flattening, therefor low comp.)
- rs500 intercooler
- greys

The plan is to reach about 400bhp.

Any tips/ideas about which turbo to use, with how much lag?
(*Ideas or suggestions about the engine rebuild are also welcome offcourse, as I'm no professional)

JRST

t34 with .63 housing

cozzie4d

will these bring me to 400bhp with the specs above?
and do you have an idea when this turbo will come in.

Spiky

iTrader: (1)

to get a t34.63 to give 400 it need to be boosting about 33psi

with a lot of head work, maybe different cams?

i assume std c/r???

if on std c/r then the boost will start to kick in aroun 3500 and pull to around 6600

cozzie4d

The head now has standard cams.
If I understand correctly, I should go for BD10 or BD14 cams?

The valves are grinded, the head is flattened, new hydraulic cam followers (Ford), new valveseals, new valvehats (or how they call them in english).
I will be using standard headbolts with a 4-layer WRC headgasket.

Will this hold/do with BD10 or with BD14 cams?

JRST

for a bd14 cams you'll need valve cut outs in the pistons

also i think i was wrong to say t34 with .63. more like t4

hows about a GT seris jobby?

cozzie4d

Okay, thats quite some new information

So what you're saying is that would need bd14 cams with a t4 to reach 400bhp??
I thought it would be easier

What do you mean with GT series?