Hi guys and gals,

I'm currently running my 2007 hawkeye wrx at 267 hp and 326lbs with scorpion full system, 1st decat and cosworth panel filter + remap.

Just wondering what I need to safely progress to the next stage. Obviously a more powerful turbo will be involved.... Can the gearbox, brakes, tmic be left as standard. Looking to go for around 330bhp.

Thanks

Richard

 

You will be fine at that level. That's about as far(ish) as you can take a Wrx for reasonable money. After that it gets expensive.

 

VF34, STi IC, bigger injectors, uprated fuel pump if not already fitted... should see you past 320bhp.

Torque is the big issue for the gearbox rather than BHP... IIRC 360lb/ft is the max it can cope with reliably according to conventional wisdom, so you don't want to go much further than you already are really otherwise you might as well factor in a 6 speed swap.

As Tez says, going further than your current set up starts to get very expensive.

 

yes i did think increased torque could cause issues for the gearbox. Can i get away with leaving tmic + injectors as they are and just go for the turbo + pump + remap if i were to stay under 330 or are they essential?

 

You can get away with it but obviously it's better/safer/easeyer if you upgrade inectors and intercooler as well. And dont forget the undertray to go with it

 

Hi Richard,

Is it a cat back system or full cat less system?

 

Hi chet, just the 1st cat removed. 2nd cat still in place.

 

You can get away without the IC but the stock injectors will be maxed out much above 300bhp so no real point swapping the turbo unless you do the injectors too IMHO.

 

Still not 100% clear if you mean the cat in the downpipe or the one under the car.... from the turbo back, there is the downpipe with a cat in it, then under the car, there is a short link pipe with a cat in it, a longer link pipe with a resonator in it (that also resembles a cat but isn't) and finally the backbox.

If you've only removed the link pipe cat, then you could fit a sports cat in the downpipe and still be MOT friendly whilst releasing a few extra horses. You might find with a sports-cat/de-cat and an STi IC, you'd be able to get ~300bhp and 350lb/ft with the stock turbo.

 

Mine has a full Milltek with sports cat, panel filter & remap and makes 285/342. '56 Hawk WRX.

Plenty quick enough for now, only had it a week though - loving the torque curve, a lot more torque on the 2.5 than my classics.

 

its the cat in the downpipe that has been removed completely and replaced with an afterburner decat downpipe. Nice figures STix

 

arnt the standard injectors on a hawkeye sti the same as a hawkeye wrx?

 

May as well swap out the 2nd one in that case - easy enough to put back in for the MOT

I thought all WRX injectors were smaller but can't say for sure on the hawks - good if they are the same as the STi though as that's a couple of hundred quid saved

 

Hawkeye wrx injectors are 565 cc or around there. No need to change them when you change the turbo as they flow the same as the STI Pinks. You could just change the turbo, an keep your wrx intercooler but it will hold it back, the STI intercooler is way better.

 

Nice to know if I ever uprate mine that I don't need to look specifically for STi ones

 

ricknight16 - removing all the cats will make hell of a difference especially in the region of torque. Just what has been mention if you want to be MOT friendly then leave the car with the cat pipe in or remove the downpipe and replace with a sports cat. If you already a decat downpipe and the catpipe remains I would leave it has that. I understand emissions regulations require atleast one cat to remain in the exhaust system.

Decat the whole exhaust system is as if its a stage 2 anyway