[FRSW12]

Originally Posted by Mim

Well you did mention wanting to keep the car easier to drive in traffic so I assume you are looking to improve performance and not mess too much with its daily driver appeal ie NVH levels and ride?

I'd research some basic weight reduction ie removing the spare wheel or switching it to a space saver, if you have a full size wheel in the boot (like my BRZ does). I hear switching the battery out for a lighter one is a good move too.

Then look to the drive shaft, as you mentioned, but I was thinking of an aluminium one rather than CF. You mentioned they rattle? First I heard of this and CF ones are a good deal dearer and not much lighter.

I'm a big fan of upgrading the FD ratio. That speeds up each gear like a 4.556 makes each gear roughly 10~11% faster or so.

Then look to lighter wheels / tires and possibly coil overs with a bias towards better ride (more of an NVH impact).

The FR-S will be a DD for me, I want to improve the performance of it with mostly bolt-on parts (at least for now) and don't want to mess with the drive-ability or NVH much.

I have been reading about after market driveshaft and looks like the aluminum one is a little lighter than the CF ones, but the CF ones are said to be better at absorbing rattling and vibration compared to aluminum, both should be considerably lighter (8-9lbs) compared to stock. I will keep the car NA so I think CF should be sufficient.

Already thought of wheels and wires, TWS T66-F wheels, 17x8, et42, weighs about 13.95lbs, and should clear BBK and discs up to 345mm. Will probably go with 225/45/17 Dunlop SportMaxx RT, which weighs about 3lbs less than stock Primacy HP.

Originally Posted by TorqueMan777

None of the things you mentioned actually reduce the drivetrain losses. They only reduce drivetrain inertia. Which is good, you'll get a performance benefit from it. But to actually decrease drivetrain loss is much more difficult, and kind of tricky. You're looking for ways to decrease friction in the engine block between the rods, pistons, cylinder walls, transmission gears, rear end gears, etc. Aside from using different viscosity oils, you would have to be willing to rebuild the whole engine and drivetrain. Your drivetrain losses are pretty much set from the factory.

I think drivetrain losses is not the accurate word here(I sucks at physics), what I meant was to reduce the drivetrain inertia and therefore improve the WHP and responsiveness because of less rotational mass....fail on my part

Originally Posted by chaoskaze

Do 1 & 2. Light weight pulley don't do anything other then makes you feel good. 😁

Rear axle too. Any other stuff is super expensive.


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Thanks, I did some more reading about pulley and looks like they are a waste of money like you said, probably will cross those off my list now

Originally Posted by Vracer111

Convert to a transverse mounted I4 engine with transaxle gearbox for best reduction in drivetrain power loss...




Flywheel is a great mod, I've yet to do it for the FR-S, but do plan on it...won't ruin daily driveability. Had an 8lb ACT Prolite in an Integra before and it was perfectly well mannered and daily driveable...even in stop and go traffic jams. Lot more getup and go in the first 2 gears....2nd gear was a blast!

Other than that the only other things possible for driveline loss reduction is the driveshafts, bearings, and fluids (engine oil, transmission, and differential)....

I heard some light weight flywheel may mess with driveability, if you ever do it for your FR-S, I'd like to hear your experience

Originally Posted by Mr.ac

Lose weight yourself, then gut out your car. Replace body parts with carbon fiber, lexan glass.

If your still worried about power loss, sell car get a motorcycle.

Working on losing weight myself now