Quote:
Originally Posted by Vracer111
The car does lack something stock, but it's not horsepower level, it's a good power delivery (one that's more linear in nature) and engine responsiveness under load from 2.5k-to-nearly 5k. It's not to say you can't boogie when needed with the stock engine delivery (keeping it above 5k rpm), but it's the one major thing that needs to be changed on it (well I would also say change out the stock rubber steering rack bushings for solid aluminum ones and a lighter weight flywheel for the much too slow stock downshifts...) Keeping it above 5k rpm really increases the oil temp above nominal awfully fast though...
Cliff notes:
To be perfect the stock FR-S needs the following:
- Revised engine characteristic from 2.5k rpm to almost 5k rpm for more linear power delivery
- Solid aluminum steering rack bushings
- lightweight flywheel to speed up the too slow downshifts (you have to add waiting time after pressing the clutch in when downshifting)...I'ts odd that my Tacoma can downshift faster than my FRS...
Note, no additional horsepower or torque or suspension changes are needed... those were nailed perfectly. It has no issues at all reaching and cornering at triple digit speeds on highway on-ramps...on the stock Primacy HPs.
I'm more than content with it's stock power level - but not thrilled with the delivery through the middle of its rpm range. My brothers '05 RS has better engine responsiveness with its 2.5L SOHC motor in a heavier car with less power output.
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At 2000rpm, this engine is making 130 ft-lb, and at 3000rpm, it's making nearly 150ft-lb. That's about 75 ft-lb per liter at 3krpm. I challenge you to find any naturally aspirated engine that makes more specific torque than that, especially at such a low RPM. The new 911 GT3 only makes about 235 ft-lb at that RPM, from a 3.8L (62 ft-lb/L)Yes, at its peak, the GT3 makes 325 ft-lb (85 ft-lb/L), but it doesn't do that until over 6000 RPM. The same story applies to pretty much every other high performance, naturally aspirated engine ever made. If anything, the FA20 is already far more responsive and torquey at low RPM than would usually be expected for a 2L, high performance, N/A engine. That doesn't change the fact that it's a 2L though, so it will never make a ton of torque down low without a turbo/supercharger.