Quote:
Originally Posted by justatroll
I never questioned that reducing mass and/or rotational inertia will give you faster acceleration.
I said it cannot make more hp
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You are correct - and that has been what I have said all along, correct? The reason I would put effort into reducing MOI with flywheel and wheels, and regearing the rear end is because it's the easiest way to increase responsiveness of the car, especially if for an NA build. For cost, flywheel + rear end regearing is cheaper than header and you will definitely feel more acceleration down low in the first 2 gears, and with zero tuning required to reap the full benefits. Again, intake and exhaust work is a given for NA build.
I'm just coming from what I've experienced with a track Integra RS (2300lbs with stock power level - that car was on par with the FR-S, but with much better initial acceleration off the line and the B18A motor had characteristics which I would love to have in the FA20. The FA20 is more of a an engine that smoothly builds it speed and doesnt want to change its rpms too quickly, the B18A lived to rev and was much more eager to do so, especially once adding the 8lb racing flywheel - going off throttle was more like gentley getting on the brakes and going on throttle like having an electric motor assist, noticeable change in decceleration/acceleration (the B18A with the flywheel literally goes up and down through the rpms, in gear, about twice as quick as the stock FA20 - I'm sure the weight difference between the two vehicles also helped with that as well.)
The flywheel made a very noticeable difference in how it launched from a stop, and it already had a custom designed and fabbed exhaust/header/intake. Noticeably quicker acceleration plus you definitely felt being forcibly pushed back into the seat at launch. And then when running on track, the motor was much more eager and quicker to run up and down the revs in gear....and that also translates to having quicker and more precise control of the car through the turns.
When it comes to building a NA setup, a properly designed lightweight flywheel, low MOI wheel design, and rear end gearing change will always be part of it for me - just makes sense and enhances the cars reflexes. The TRD/Toda flywheel is on my highly want list along with a 4.56 ratio ring and pinion. I've also ended up going to a 'skinnier', lighter, and slightly smaller diameter tire setup than stock which suits the car better. A more responsive car is what I'm looking for in an NA build. I'm one of the owners who is more than content with the stock power level of the FR-S - It just needs less mass and a little quicker reflexes.