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Unread 01-21-2013, 04:35 PM   #1
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Question 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!

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Unread 01-21-2013, 04:57 PM   #2
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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
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Unread 01-21-2013, 04:59 PM   #3
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Alright thanks, I'm not getting the car until this summer anyways but what's the difference between hp and rwhp?

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Unread 01-21-2013, 06:22 PM   #4
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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.
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Unread 01-21-2013, 09:25 PM   #5
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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.
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Unread 01-21-2013, 10:04 PM   #6
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Why not wait till the Turbo one comes out?
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Unread 01-22-2013, 10:14 AM   #7
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Because we don't know if there will be a turbo model.
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Unread 01-22-2013, 10:57 AM   #8
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It's not an entirely new engine. It's still the same flat 4 boxer, with heads and fuel delivery designed by Toyota.
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Unread 01-22-2013, 11:41 AM   #9
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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.
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Unread 01-22-2013, 02:55 PM   #10
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Thanks guys real helpful information but I'm alright with adding a turbocharger to it myself

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