cossie51

It looks like it's time for me to take my car back to have the map checked and adjusted so was thinking of upgrading the turbo at the same time to save on paying to be mapped twice.
Current spec

200 block with valve pockets machined in to pistons
Mild polish and ported head with ba16 inlet std exhaust vernier pulleys
T34/63 turbo holds 28psi. Air injector boost control
Pectel T2 management and loom.

The block wasn't long studded when built as wasn't going to run 400 + bhp but was fitted with ARP Stud and nut kit. A few people have said I can't run anymore power as will crack the block because of the ARP stud kit if I fitted a bigger turbo due to it trying to lift the head.

My question is can I change the turbo for say T38 or maybe a GT30 without any problems or am I stuck at the current power unless I strip the block and have it long studded.

cossynut2

My 2wd Saff engine was built 20 years ago with a new 200 block which is wire rung not long studded , group A head gasket only, runs 2 bar of boost through a T38 turbo with billet compressor wheel. Lots of other power upgrades but never had any issues with it at all.

cossie51

Are you on standard head bolts or the ARP stud kit. I was told the ARP kit doesn't stretch so pulls in the threads and cracks the block to which point I would rather stay at the current power rather than take the risk.

costina

iTrader: (1)

That is correct. This is the result.

cossynut2

Standard head bolts.New 200 block,Group A spec ported and polished head, Balanced bottom end with competition bearings, uprated oil pump,7.45-1 low comp Mahle pistons with pocketed valve cut outs,T38 turbo with billet compressor wheel BD10 & BD12 cams,A&S hart style inlet, Siemens 890cc injectors, L8 ecu with custom MSD chip, wasted spark ignition,lightened flywheel, hydraulic clutch conversion with helix 6 paddle clutch, Bosche 044 fuel pump, new engine and fans wiring looms, RS500 style intercooler, pre-turbo cooler and uprated aluminium radiator.
All "old fashioned" by todays standard but it still goes well and has plenty of get up and go!
The point I am trying to make is you can safely upgrade your power and still keep reliability.I have done a lot of miles in mine and its power gets well used but so far so good.
My advice to you would be talk to a Cosworth specialist, tell him what you want and what will be required to achieve it.

cossie51

I'm currently running a standard T34/63 that is over due a rebuild or upgrade but what can I use that will be an improvement as seems an ideal time to do so but not wanting to crack my block due to being fitted with the ARP stud and nut kit

turbotrev

What about removing the studs and fitting standard bolts?

I don't know if removing the studs is straight forward or not though

Cheers Paul

cossie51

If I was going to do that then I might as well strip the bottom end and get it long studded.

The car is more than quick enough at the moment but thought as the turbo needs looking at why not upgrade at the same time.

Was thinking of sticking with the T34/63 but having it converted to roller bearing and maybe a billet wheel if that's not going to risk cracking the block.