Blueroadster CW FL5 CTR Build Thread

[Sporky McGeuschky]

New shoes installed. Advertised G025 SZ wheel (19x9.5 +44) weight is 20.28 lbs. Advertised DWS06 Plus tire (275/30R19) weight is 24.20 lbs. Actual combined wheel and tire weight is 44.00 lbs.

Wow, that is pretty dang light!

My MITA FKS 18X9.0 wheels with Pirelli P Zero 275/45 ZR18 tires have a combined weight of over 48 pounds.

Hmm... I wonder if there is any way I can shave some weight next time I buy tires...

 

[Xmetal]

Wow, that is pretty dang light!

My MITA FKS 18X9.0 wheels with Pirelli P Zero 275/45 ZR18 tires have a combined weight of over 48 pounds.

Hmm... I wonder if there is any way I can shave some weight next time I buy tires...

Your PZero tire by itself already weighs 30lbs, according to TireRack!

 

[blueroadster]

OEM wheel (19x9.5 +60) weight is 26.68 lbs. Advertised OEM tire PS4S (265/30R19) weight is 24.5 lbs. Combined wheel and tire weight is 51.18 lbs. or 204.72 lbs. on all four corners. Current wheels and shoes weigh 44.00 lbs. or 176 lbs. on all four corners. Change results in a 14% reduction in unsprung weight.

OEM front rotor weighs 24.6 lbs. GyroDisc front rotor weighs 21.1 lbs. OEM rear rotor weighs 10.7 lbs. GyroDisc rear rotor weighs 8.8 lbs. OEM rotors on all four corners weigh 70.6 lbs. GyroDisc rotors on all four corners weigh 59.8 lbs. Change results in a 15% reduction in unsprung weight.

Wheels, tires and rotors combined on all four corners, OEM weighs 275.32 lbs. and current setup weighs 235.8 lbs. Total unsprung weight reduction on all four corners of 39.52 lbs. (14.35%).

 

[blueroadster]

For reference…Going with a lighter lug nut will obviously result in the best performance bang for the buck.

OEM lug nut weight:

Ray’s lug nut weight:

I was simply curious of the weight comparison. Not looking to shave grams for every bolt/nut used.

 

[Sporky McGeuschky]

Your PZero tire by itself already weighs 30lbs, according to TireRack!

Yup. You got it.
My MITA FKS wheels do weigh just over 18 pounds each, so, yup. About 30 pounds a tire is correct.
Pretty nutz, eh?

Cushy ride, though. Maybe a little too cushy with all that extra sidewall.

40 sidewall next time around gonna be a nice reduction in fender rub and in weight.

Cheers.

 

[Sporky McGeuschky]

For reference…Going with a lighter lug nut will obviously result in the best performance bang for the buck.

OEM lug nut weight:

Ray’s lug nut weight:

I was simply curious of the weight comparison. Not looking to shave grams for every bolt/nut used. Ironically, the FD RX-7 engineers focused on gram weight reductions where torque specifications were critical because many bolts were drilled to save mere grams.

Here is another area where I Epic Failed the "FL5 Type R Weight Reduction Project" :

I bought extended length chrome steel lug nuts to replace the super duper short OEM stubbies.
Who knows how many grams of unsprung weight I added to my corners with those?

I could know, but that would take the effort of calibrating my scale and like measuring... and stuff.

So my light wheels have been "de-lighten-o-fied", a.k.a. "re-heavy-fied", by adding big and heavy tires AND lug nuts.

Pretty sure this is still lighter than the OEM stock setup with those 26 pound wheels.

Whaddya gonna do, eh?

 

[blueroadster]

New rotors and pads installed to complement the new shoes. PIC was right after mounting the wheel so the suspension was not settled. I’ll detail the calipers in the Spring when it warms so I can also fix a few paint chips.

Sponsored