Can this thing really hand an STI a blood nose? But if anything, that just makes the anticipation all the more tasty. It’s a sharp reminder that this is a WRX, not an STI. It’s a bit strange to jump into a tuned WRX and not be confronted by the active diff controls in the centre console. MRT’s super Rex is more than the sum of its parts And just to make sure you don’t confuse it with a stock Rex, MRT also added an STI body kit. A shift kit was added as well and a set of ROH wheels and Kumho Ecsta KU39 tyres fill the guards.īrakes? Yep, they copped a once-over, too, with MRT’s own Big Brake Kit on the front and its Super Sport Rear Brake Kit out back.
In this case, the trick was to fit a set of MCA coil-overs.
#Etuner wrx upgrade
Middleton has a rich rally background and that’s reflected in the way his cars also cop a handling upgrade as a matter of course. Oddly enough, Middleton reckons the maximum boost you’ll see on this engine is the same 21psi as the stocker, but it’s that more rapid spool up and holding on to boost for longer that makes all the difference. “We did a lot of homework on the exhaust, but even the cold-start program took days to sort out and get right.” “The real challenge with tuning these things is finding the right tune and matching it with the right exhaust,” Middleton adds.
There’s also an alloy pulley kit, a Verticooler top-mount intercooler (which is bigger than the stocker and tilted at a better angle for air to hit it) an E-flex sensor and an adjustable blow-off valve.īut if that doesn’t sound like a huge change, Middleton reckons the real sweat was in making sure it would all work in harmony with no trade-off in driveability or reliability. So what exactly were those fiddles? Well, let’s start with the MRT Power Pack that gives the flat-four a new set of parameters to work with. Mind you, we had to try hard to make sure the bias control for the traction control and ESP still worked once we’d been in and fiddled.” “And I reckon the traction control and active stability control in this thing is possibly even better than the STI’s active diff. All you need to do is put a tune in it and it’s quicker than an STI. This thing (the MRT-modded car) is building boost longer the standard car tapers off the boost too early. “The WRX has a twin-scroll turbo, so it spins up faster than the STI. But Senor Middleton is convinced that anybody after a road-burning Rex would do well to forget the STI and instead start with the base-model WRX which, BM says, is a better starting point. This thing will crap all over an STI.”Ĭheck out all the Hot Tuner 2015 action here.Īnd, with those words, MRT Performance head honcho Brett Middleton flicked the switch to duck-and-cover. All you’re buying is a bullet-proof gearbox and some bling.
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