A question from a new WRX owner

Madoc05 · 04-30-2007, 12:30 PM

I was just wondering what size injectors the 07 WRX have in them? I have 450 black tops from my old DSM, and just wondering if I could use them? Also what would I have to do to run a 57trim? Exhaust Manifold, Exhaust, Fuel Pump, SAFC, injectors? And my last question, is does Subaru have a standalone EMS like a DSMlink or would I just have to use an AEM EMS or megasquirt. Once Again I'm new to WRX's so please don't flame me if these are stupid questions

mosc · 04-30-2007, 01:07 PM

think the stock 06/07 injectors are around 560. You don't need your DSM's injectors.

I don't know what "57trim" is. A garret turbo? If so, you have to get a custom uppipe and downpipe along with a custom intake and some minor things like feed lines. Also, you can't use the stock ECU with these, so you'd need like an AEM EMS to control it. That's in addition to the usual mods for replacing a turbo which are (intercooler, injectors, fuel pump, tune, aftermarket exhaust). The WRX uses a TD04 which is more easily replaced with most VF series or mitsu turbos (16G, 18G, etc)

The WRX has many good EM options, most use the stock ECU. It's highly re-programmable. There is an open source software package you can use to re-flash the stock with many popular configurations. Cobb makes a portable reflasher you can use with your car which is quite flexable. TXS makes a piggyback system which is quite robust if you want to tune the car yourself. Beyond that, you get into things like the stand alone AEM EMS products.

mattxander12 · 04-30-2007, 03:49 PM

Quote:

Originally Posted by Madoc05

I was just wondering what size injectors the 07 WRX have in them? I have 450 black tops from my old DSM, and just wondering if I could use them? Also what would I have to do to run a 57trim? Exhaust Manifold, Exhaust, Fuel Pump, SAFC, injectors? And my last question, is does Subaru have a standalone EMS like a DSMlink or would I just have to use an AEM EMS or megasquirt. Once Again I'm new to WRX's so please don't flame me if these are stupid questions

mosc is correct in the 07 injector sizes. to run a turbo from your DSM you'll need to reflange it. To run it optimally , all you would need is a new Downpipe, injectors and fuel pump should be fine stock... and some form of EM. The most common are Cobb AP and UTEC Delta. They are piggy back systems... you can find more in the stickies at the top of the forum.

squidz · 04-30-2007, 04:32 PM

In order to run a T3/T04 series turbo on the car (either a 50 or 57 trim), you would need a custom setup also known as a rotated mount. the turbo housing will contact the intake manifold when using something this large.

A special uppipe can be used that will rotate the turbo mounting point about 30 degrees to allow clearance from the engine block / intake manifold. You can't use the top-mount intercooler with this setup either, due to the raised and clocked position of the turbo. A front mount intercooler with custom charge pipe to fit the new turbo will be needed. The intake can usually be run directly off the turbo, and most rotated mount kits will either have an intake pipe with a place for the MAF, or will relocate the MAF in one of the intercooler cool side charge pipes.

The rotated mount setup is very effective for high horsepower numbers, but these bigger turbo systems tend to have more lag, which is why most of them are designed for the GT series ball-bearing turbos. I really think a T3/T04, even with a 57 trim wheel in it would spool way too slow. When compared to other options out there (the Mitsu turbos for example), it just doesn't seem like the best choice for these cars.

I'd sell the 57 trim to a Honda guy (they love those things) and buy something a bit better suited to the Subie engine.

Madoc05 · 04-30-2007, 08:49 PM

Ok thanks for the info, sounds like the stock turbo is close to the 14b. Anyways thanks for the help, a walbro 255 should be good or do you guys suggest something different. Any good places to order this stuff from, like Slowboy racing, which I have used in the past.?

mosc · 04-30-2007, 09:00 PM

walboro 255 is good for more fuel than you'll run on a 500whp WRX so it's fine. They're fairly standard so yeah, I'm sure it's the same as DSMs.

and our site sponsors are all good parts sites. (really, I'm not being bribed to say that).

newtothegame · 04-30-2007, 10:28 PM

What kind of power do you plan to make with your car? An 18G or a 20G would probably be a great turbo for your car. One of those are in my distant future I hope. Check out blouchturbo.com for some nice turbos, and options for them. Also depending on what amount of HP you make dont forget to take care of that transmission. Good luck with your car

Madoc05 · 04-30-2007, 11:44 PM

That would be nice if the walbro was the same as the DSM one, seeing I have one laying around. I haven't really decided on how much power I want, probable for the first season, I'm just going to do the basics, fuel pump, exhaust, maybe a BOV, any suggestions on the BOV, turbo timer boost controller. Anything else I should look into?

bigbadbuddha · 04-30-2007, 11:49 PM

Before you do any of that go to stage 2 and get a protune.... You will be surprised in the amount of power you can gain.... I know someone who did a simple stage 2 with a protune on an 06 wrx and got 245awhp and a whopping 318lb/ft of torque at the wheels...
That's enough to make anyone smile...

Madoc05 · 05-01-2007, 05:59 PM

I guess my question with the EM is is anything offered with an anti lag, RPM limit, no lift to shift. I know a lot of the 2gnt guys use an MSD ignition for the above, can I use one of those or is there something different

squidz · 05-01-2007, 06:54 PM

Definately do not want to use flat shifting (no lift to shift) with the imprezza platform. You will shred your transmission almost instantly. Maybe it would be ok if you had PPG gears, but even then, really not a good idea.

Anti-lag is almost as bad, leaving the line with boost on tap is really hard on the drivetrain, and will most likely shred the tranny or twist driveaxles. This i know from personal experience. Luckily, drive axles aren't that expensive, specially since it wasn't my car.

You need to build the car to handle either or both of these ECM features. Built tranny with PPG gears and Stage 2 or 3 axles should be ok, depending on your power level. The WRX won't respond well to these features like the older DSM's do.

However, if you want all of these features, then the new UTEC Delta offers them for the WRX, as does the AEM Stand-alone unit.

I don't think MSD makes a controllable ignition module for the single coil-on-plug systems these cars use, but if they do, i don't see any reason you couldn't use it just like in any other car.