[Packofcrows]

Originally Posted by Akya2120

...I am not exactly sure how I want to go about it. It's coming with the TRD springs, sway bars, brake pads, quick shifter, and muffler.

Wait till you get it and know you want to keep it. IMO buying a twin with the intention of making it fast, should not be your first reason to buy it.

This is my short term plan. Keep it minimal for about the first three years. I'm thinking GrimmSpeed intake, ECUtek reflash, Subaru radiator/oil heat exchanger, and some general chassis stiffening stuff. Maybe changing the thermostat, but I live in Washington and it's rarely super hot out.

Quesiton about this^. Should I wait until after the break in period is over to reflash, or does it not really matter?

As techy's here have stated wait till the break in period. That way your engine will deform/mold into your driving attitude and habits. Many say 1k, I was raised with old cars and the belief that 10k is more like it. I wait until 2.5k personally.

...turbo, making about 200-230 WHP and trying to tune it so that I get great fuel economy.

e85 and a good tune, exhaust, pulley, intake, header...etc w/o turbo might get you near there.

Frankly I would love to see this car hit a MPG of 40-50. It'd be nice to show the world that a car can be fun, and economical. Not sure what exactly would be required to do this, or if something like that is even possible.

Sure, it's possible. Do what a few old Mustang fans are doing down here and add in electric batteries or find a diesel set up... lol 40mpg on straightaways with 60mph, no extra weight is possible! I've hit that on 300mile trips. I don't even think you'd hit 25mpg in town with a turbo. Some argue that you get +3 or so mpg but I don't agree. Maybe in an auto. Past 45mpg I highly doubt you can, but there is a funny picture on the forums where someone reset their mpg and drove downhill and took a pic of the mpg reading at 120mpg+, so if you just drive down hill, you can achieve this!

I looked around to see if anyone was trying to do an economy build but didn't really find anything. Mainly just people talking about what kind of mileage they are getting after they did their build.

Thanks for reading!

The twins are not an econo-box. I wish they'd hit 30mpg in town and 40 in HWY at hwy speeds, but they don't. Again, dont buy the twin as a mpg/hp tune machine for DD. If you want hp and mpg, imo there's the mustangs (eco boost?) and Fiesta (?). I'm not a fan, but they do have a a tad more mpg/hp. Ours are mini go-karts with a big heart. Driving is majestic and I've yet to become bored of it.

Try the tech forums here and you might learn a bit more whether you want a car like the FRS or really want the FRS. Don't forget, the FRS is like the trim level of the twins. In WA it gets so cold your nuts can stick to stuff, so you might like the BRZ with seat warmers more, and later do cosmetic mods to flip some of it to look like the FRS.

P.s. remember too, 12.5:1 compression for this engine is tad high for FI. That's whats stopping me from S/C or Turbo. Many have successfully done it, though.

Originally Posted by ninedice

He says his course is around 53 miles, mostly highway with some city and hills mixed in. The car was stock for his test.

Here is his auto frs review (40.6 mpg by the way).

The manual brz got 38.1 mpg

That's not 100% exact imo if only based on one car reading, and the car's reading at that. When I factored my driving from Monterey to LA (634 mile round-trip x 5 trips I took in one month), I had my FRS 6mt stating 42.3 MPG as avg (driving to LA, and returning was like 36) (no traffic driving at midnight-4am ish), but when I checked on multiple mpg sites like fuelly, it was more like 38. Also based on the gas I pumped it was in the high 30's. IMO the mpg on our cars is off by +3 or -3 of what it states.

Also, I drove at 60mph-65mph, shifted at 2.5-3k for that trip, 90%+ hwy driving and no a/c whole time. 53 miles imo is not enough as a testing area. Try 100 minimum as an 'estimate' and a whole week of driving those same roads in order to create a good solid estimation.

Don't forget altitude, pressure and temperature help or hinder mpg. Auto will get better mpg because of the transmission. Don't forget.



I'm personally at 21-26 with 80% city, and 20% hwy. Yesterday being in SJ I got 38mpg driving to SJ, and coming back 32-34.