whilst being bored at work i have been thinking what would be nessesary to convert my 205 gti6 to turbo power, that that i want to do it but really im just trying to research it just incase i decided to do it in the future

if i was to do it it would of course be a homebrew conversion, now the only homebrew conversion i have seen or come across has been a saxo vts which was in my eyes a bit of a bodge/not very well thought out but it was damn quick while it lasted, i believe the the owner raised lowered the compression by fitting 2 head gaskets, used a turbo from a renault 5 gt turbo(possibly too small) downpipe and exhaust were also too small, intercooler from a renault 5, the standard air mass meter was used and he used some sort of system which triggered an added 5th injector. all in all me and a friend expected the car to not last long and we were right, but we were impressed when the car was getting into the 13s down santa pod.

so anyway, i have given thought to how i would do a turbo conversion for my 6, and have thought up a list of parts

t3 turbo similar to something from a escort cosworth

bigger injectors

aftermarket management

turbo exhaust manifold

fuel pressure regulator

a different inlet??

low compression forged pistons and rods

external wastegate

high pressure fuel pump

a decent headgasket

different cams to suit turbo power

uprated valve springs

now thats my list, would you say i would be having some sort of a reliable set up there?

________________________________________

205 gti6 now sold up, but gonna stick around and see whats what

can you turbo it on a standard engine or does it all need to be uprated??

The 2 turbo threads on here don't really list much info at the beginning regarding the engine spec and just eventually you see they rebuild it with uprated parts half way through..

Yes, you could, but it would need to be a low pressure turbo and you would need to be very careful to keep intake temperatures down to avoit detonation. One way is to fit a copper decompression gasket, but you cant change the fact that the standard cast pistons have a lower melting point and less ability to dissipate heat than a forged item designed specifically for the job. In short, the standard engine is relatively high compression and has pistons unsuitable for high temperatures and pressures. You could get more power than standard with a small turbo, but it won't be as good or as kind to the engine as low boost SC and it has far more potential to go wrong. By the time you add fabricating an inlet, and exhaust manifold, front mounted intercooler, ancillaries and mapping you are likely to have spent a lot on something that will be less drivable and much more prone to failure than the tried and tested SC route. If however you intend to do it properly, new turbo, well designed exhaust that won't overheat the exhaust valves due to back pressure and damage the turbine blades with harmful pressure waves (will take a lot of experimentation) all new internals forged low comp pistons, water injection, big boost piping and a suitable intercooler then the sky is the limit. However you will be in unknown territory funding your own development and that is an expensive path to go down.

________________________________________

R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars