Toyota Scion Fr-s Tuning - CarForum.net - Car Forums, Automotive News and Community

ChadP777 · 01-21-2013, 03:35 PM

I have decided that I'm going to get the Scion Fr-s however I was wondering when I get it what would be the cheapest way to add some horsepower and some low end torque I'm not looking to spend a whole lot of money on it for now, maybe later I will add a supercharger or something but what would yall suggest? Thanks!

**Mike** · 01-21-2013, 03:57 PM

From what I've seen of these things they're tuned to get about everything they can from the factory. The tunes I've seen get you maybe 10-20 hp tops, haven't seen one crack 200 rwhp on just a tune yet.

If it were me i'd give it a year, let more companies have a go. By then there'll be a lot more guys tuning them

ChadP777 · 01-21-2013, 03:59 PM

Alright thanks, I'm not getting the car until this summer anyways but what's the difference between hp and rwhp?

**S D** · 01-21-2013, 05:22 PM

Hp is measured at the crankshaft and doesn't include drivetrain losses. Whp is the real number we're Interested in, as it is the power measured at the rear wheels.

pbasil1 · 01-21-2013, 08:25 PM

Rwhp - Rear Wheel Horse Power
Awhp - All Wheel Horse Power
Fwhp - Front Wheel Horse Power

Its measured by putting a car on a dyno (dynomometer) and testing how much horse power is actually applied to the wheels. The HP rating on a sticker is totally different from what actually gets to the wheels due to things like friction, gear reduction...etc.

For instance an 05 Lancer Evo has 276 hp on the sticker from factory. Put that car on the dyno and it will only have about 215-220 Awhp. Also, an 04 Hemi Ram we put on the dyno, 340 hp from factory only did 267 Rwhp.

As for your original question, i too would have to agree with Mike and wait for another year or so, its still a very new car design and totally new engine from Subaru. So theres a bit of a slow start from the aftermarket community, though its rapidly growing since the FRS/BRZ is such a great platform and is growing in popularity very quickly.

Im sure a nice programmer will be out soon if its not already, that is software based through the obdII port like the STI's use.

On anverage its safe to assume about a ~20%+ drive train loss. If its a bigger truck/suv, more like 30% loss.

**lautinjr** · 01-21-2013, 09:04 PM

Why not wait till the Turbo one comes out?

**Mike** · 01-22-2013, 09:14 AM

Because we don't know if there will be a turbo model.

legoman786 · 01-22-2013, 09:57 AM

It's not an entirely new engine. It's still the same flat 4 boxer, with heads and fuel delivery designed by Toyota.

**S D** · 01-22-2013, 10:41 AM

Toyota and Subaru have agreed to sell a supercharger kit for the twins, with a factory warranty. The unit is said to be a small to mid sized TVS style S/C made by eaton with the goal of high response. There aren't too many details available yet.

A factory turbo model is in the works, but don't hold your breath as the demand on these cars is keeping stock low and prices high. Toyota is likely looking to wait until sales slow to introduce the turbo model. Also, don't expect huge power numbers - Expect the car to be wicked quick around a real track though.

ChadP777 · 01-22-2013, 01:55 PM

Thanks guys real helpful information but I'm alright with adding a turbocharger to it myself

01-21-2013, 03:35 PM	#1
ChadP777 Member Join Date: Oct 2012 Location: U.S. Posts: 79 Rep: 10	Scion Fr-s Tuning I have decided that I'm going to get the Scion Fr-s however I was wondering when I get it what would be the cheapest way to add some horsepower and some low end torque I'm not looking to spend a whole lot of money on it for now, maybe later I will add a supercharger or something but what would yall suggest? Thanks!

01-21-2013, 03:57 PM	#2
Mike Community Director Join Date: Jun 2008 Location: Between a rock and a hard place. Posts: 6,141 Rep: 129	From what I've seen of these things they're tuned to get about everything they can from the factory. The tunes I've seen get you maybe 10-20 hp tops, haven't seen one crack 200 rwhp on just a tune yet. If it were me i'd give it a year, let more companies have a go. By then there'll be a lot more guys tuning them __________________ Take me down to the paradise city where the grass is green, and the girls are pretty. \| Save a tree, support your local drag strip! Read the rules! \| DO NOT REPLY TO SPAM Daily Driver: 1996 Chevy Blazer LT 4x4 - 235k miles Girlfriend's Car: 2003 Oldsmobile Alero GLS 3.4L 4 door - 130k miles Bike: 1981 Yamaha XS 400 Plow Truck: 2000 Chevy Silverado 2500 LT - 190k miles [6.0L, 4x4, ECSB, Eaton Rear Locker] Others: 2012 Chevy Cruze automatic, Sonic sedan manual, both 1.4 Turbo, LT trim

01-21-2013, 05:22 PM	#4
S D Forum Editor Join Date: Mar 2007 Location: In the garage. Posts: 1,667 Rep: 51	Hp is measured at the crankshaft and doesn't include drivetrain losses. Whp is the real number we're Interested in, as it is the power measured at the rear wheels. __________________ Simplify, then add lightness.

01-21-2013, 08:25 PM	#5
pbasil1 Boosted Audiophile Join Date: Jul 2006 Location: Annapolis, MD Posts: 2,263 Rep: 195	Rwhp - Rear Wheel Horse Power Awhp - All Wheel Horse Power Fwhp - Front Wheel Horse Power Its measured by putting a car on a dyno (dynomometer) and testing how much horse power is actually applied to the wheels. The HP rating on a sticker is totally different from what actually gets to the wheels due to things like friction, gear reduction...etc. For instance an 05 Lancer Evo has 276 hp on the sticker from factory. Put that car on the dyno and it will only have about 215-220 Awhp. Also, an 04 Hemi Ram we put on the dyno, 340 hp from factory only did 267 Rwhp. As for your original question, i too would have to agree with Mike and wait for another year or so, its still a very new car design and totally new engine from Subaru. So theres a bit of a slow start from the aftermarket community, though its rapidly growing since the FRS/BRZ is such a great platform and is growing in popularity very quickly. Im sure a nice programmer will be out soon if its not already, that is software based through the obdII port like the STI's use. On anverage its safe to assume about a ~20%+ drive train loss. If its a bigger truck/suv, more like 30% loss. __________________ 1991 Supra - Fully built! 2010 Toyota Tundra Rock Warrior US Amps MD3d - Tcsounds LMS-R Audison Lrx 2.250(x2) - Morel MT-23 and CDM-88 Audison Lrx 4.300 - Dynaudio Mw180 "Its worse than porn...at least I can get a girl...no way I can get that car. lol" -Gandalf Last edited by pbasil1; 01-21-2013 at 08:32 PM.

01-21-2013, 09:04 PM	#6
lautinjr Now accepting bribes. Join Date: Oct 2007 Location: Currently Las Vegas Posts: 4,026 Rep: 191	Why not wait till the Turbo one comes out? __________________ Please help reduce our mini van population and wear condoms!

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Toyota Scion Fr-s Tuning

01-21-2013, 03:59 PM	#3
ChadP777 Member Join Date: Oct 2012 Location: U.S. Posts: 79 Rep: 10	Alright thanks, I'm not getting the car until this summer anyways but what's the difference between hp and rwhp?

01-22-2013, 09:14 AM	#7
Mike Community Director Join Date: Jun 2008 Location: Between a rock and a hard place. Posts: 6,141 Rep: 129	Because we don't know if there will be a turbo model. __________________ Take me down to the paradise city where the grass is green, and the girls are pretty. \| Save a tree, support your local drag strip! Read the rules! \| DO NOT REPLY TO SPAM Daily Driver: 1996 Chevy Blazer LT 4x4 - 235k miles Girlfriend's Car: 2003 Oldsmobile Alero GLS 3.4L 4 door - 130k miles Bike: 1981 Yamaha XS 400 Plow Truck: 2000 Chevy Silverado 2500 LT - 190k miles [6.0L, 4x4, ECSB, Eaton Rear Locker] Others: 2012 Chevy Cruze automatic, Sonic sedan manual, both 1.4 Turbo, LT trim

01-22-2013, 09:57 AM	#8
legoman786 Veteran Member Join Date: Jul 2006 Location: Tucson, AZ Posts: 571 Rep: 15	It's not an entirely new engine. It's still the same flat 4 boxer, with heads and fuel delivery designed by Toyota. __________________ 2005 Chevy Aveo. Wife needed a car. Bleh.

01-22-2013, 10:41 AM	#9
S D Forum Editor Join Date: Mar 2007 Location: In the garage. Posts: 1,667 Rep: 51	Toyota and Subaru have agreed to sell a supercharger kit for the twins, with a factory warranty. The unit is said to be a small to mid sized TVS style S/C made by eaton with the goal of high response. There aren't too many details available yet. A factory turbo model is in the works, but don't hold your breath as the demand on these cars is keeping stock low and prices high. Toyota is likely looking to wait until sales slow to introduce the turbo model. Also, don't expect huge power numbers - Expect the car to be wicked quick around a real track though. __________________ Simplify, then add lightness.

01-22-2013, 01:55 PM	#10
ChadP777 Member Join Date: Oct 2012 Location: U.S. Posts: 79 Rep: 10	Thanks guys real helpful information but I'm alright with adding a turbocharger to it myself