hi all right was ment to be getting car mapped on thursday but changed mind on spec so put it off, but now can't decide what turbo to run here is a spec list of the car at the moment

> 2.5 version 9 rod and forged pistons (fresh just done 1500 mile run in )
> Version 3/4 sti heads skimmed and overhauled new stem seals etc..
> ARP head studs
> 1.6mm cosworth head gaskets
> Cosworth oil pump
> Zero sports thermostat
> Parallel fuel lines
> Fuel pressure regulator
> 740cc injectors
> Large front mount intercooler
> VF43
> RCM/GT spec 3 bolt headers
> De-cat

> Version 7 sti 6 speed box, r180 diff and hubs etc..
> AP racing clutch
> BC coilovers
> Whiteline arb's/ anti lift kit

so its all set up correct and ready to got now the problem is turbo.. was runnng vf43 and standard v3/4 sti topmount but realised i am limiting the rest of the set-up with these, so fmic is now fitted just turbo choice do i stick with the vf43???

what do i go for got a vf 22 here which was going to put on but not to sure as there is minor blade damage don't want any of this in my engine

but i can get another 22 as heard these run good power on 2.5's what do you all recomend for my set-up to gain 400bhp here or there don't mind if it is just below put a lot of work into this car a lot of late nights over a 3 week period lol

eventually going for a md321t just waiting for one to come around lol

thanks all in advance scott

 

if 400bp is your goal, try a md321h or a harvey smith 20g, both good value for money, can be a bit hard to find a good quality second hand one though

 

MD321T or SC46 Billet on will be very nice to drive on 2.5 with mountain of torque,these are two best turbos which are very well suited for 2.5L.

About the VF22,these turbos are too fragile,which i know Owen Developments doing something like Hybrid which will make 400bhp.


Jura

 

i have an almost identical setup and run a harvey smith 20g, il post up my graph 436/460 makes for an awesome road car imho.

 

SC46 Billet. Could see near to 500bhp on a 2.5 (esp if mapped on V-Power + meth). This turbo spools great for a 450+ turbo... so will be stunning on a 2.5!

Or even get a 500+ turbo (assuming decent forged pistons?), as the spec allows it! The Hawk's STi rods are the 'weakest' link, but should be okay at around 500bhp if not tracked often.

 

i have the same rods and was advised by a lot of well respected people not to go any further, its not so much the bhp you have to worry about its the torque !

 

Yeah, obviously the torque.

But the lb ft number is never far away from the bhp (even higher than bhp on a 2.5, usually). So the figures are 'interchangeable' in that respect

If you were advised, then fair enough.

But surely they're good for 450 odd no? If so get that damn SC46 in there!

 

"if one fails you can wave goodbye to the block, the pistons, the crank, the water cross pipe, the sump, water pump, oil pump, possibly even the turbo. It is quite simply not worth the risk." Quoted from one of my reply's on 22b

 

Oh yeah, I'm fully aware of the collateral damage when a rod's limit is breached.

 

I know they have there limits what have you been advised is the maximum you can run the version 9 rods at I've been told 450 area which is more than enough

seen as though my old engine only came out due to minor piston slap when cold lmao talk about snowballed haha got a bit carried away

 

i was advised not to go further than i am 436/460, i started the thread to see about getting an sc46 billet, decided i would really be pushing it with that turbo so stuck with the 20g, some people have obviously run more, but the general consensus was they were getting away with it rather than it being reliable for very long

 

Bite the bullet and save for a new SC46 billet turbo. This is a genuine 450 bhp turbo with all supporting mods. You then have one map session and a turbo that will make you happy. Yes your limit is your latest Subaru rods which are good to 430-450 bhp and pushing them hard puts you in to a dangerous area so the turbo is well suited to your needs.

 

interesting very 20g it is then, are you running the same set-up as me or does it differ if so what???

thanks also your graph mad my mind up lol would be more than happy with that sort of power for sure is that on v-power or a mix of meth

let me know scott

 

only difference is i have 850cc injectors and run a simtek, neither which should make a difference tbh. Thats on a 20% meth mix

 

sorted well we will see what happens when i find a td05 20g yes only running 740's but plenty full for the job in hand lol also running a gems with a/l + l/c

what sort of power did you get when running v-power on its own if you did do that is

thanks again scott

 

got my 20g form harvey smith, top bloke to deal with yeah your 740's should be plenty, i only got 850's because they came up for the right price after i maxed my 550's during mapping (at circa 380bhp), make 404/430 on straight vpower. Meth is a no brainer if your happy handling it etc, wait till fuel gauge gets to under half then dump in 5 litres of meth and 20l of fuel (on a a classic, amounts will be different on a newage) and its only 60p a litre !