I was just reading a post on the coop forum, where somebody was asking if his injectors fuel enough for 340BHP. Here's what Flea (tuning/mapping god) said:
"No equations needed, real world data should be used in this instance therefore 380cc would just about cover it on a 20vt but I would recommend going to 400cc or 440cc because it gives you plenty of headroom"
So there you go. The standard ones would cover 340 (just) but it's recommended to go bigger for the headroom.
Donny Lad - you won't need a Fuel cut defender, I don't know anyone with a modified coupé that has one
I think you're thinking of jap cars, that do need them because the engine cuts fuel if it sees excess boost (or even just too much air going through the AFM and it makes a guess maybe)
Sniper - Basically, to hit 400 BHP you're going to need:
* bigger turbo - GT2871R would be good (then you need to think which size housing you want, bigger means more power but more lag)
* Front Mount Intercooler - you need to cool the charge down
* Bigger downpipe - a must
* 3" exhaust system - from turbo-back including the downpipe would be best.
* Walbro fuel pump (255LPH)
* Fuel voltage mod - there needs to be a solid 12v going to the pump, normally there's only about 9. It's a simple job and there are a couple of guides floating about for this.
* Bigger injectors - discussed above
* a good remap - a stage 4 at Flea's for those aiming for 380-600BHP is £375
* SIP (side intake pipe) basically a pipe straight from the turbo, containing the AFM, dump valve and air filter. You junk the old air filter and housing. It's a must for good power.
*air filter for the SIP - any will do really, K+N, Pipercross, I'd go for Apexi.
I think that covers it, off the top of my head. There's other little bits and bobs obviously. I think you're talking about 4K for 400BHP. You can hit 300 now with fifteen hundred quid, if you buy some stuff second hand (exhaust,FMIC etc)
