Confirm understanding of lightweight mods

[86TOYO2k17]

Originally Posted by SuperTom

Can you post a link to what parts you are looking to buy?

https://www.fensport.co.uk/products/...loy-pulley-kit

That is the full set. I already purchased these last night except i bought each peice individually bcs I wanted black coated and didn’t want crank pulley. They said belts will be back in stock ready to ship by Tuesday.

[SuperTom]

Originally Posted by 86TOYO2k17

https://www.fensport.co.uk/products/...loy-pulley-kit

That is the full set. I already purchased these last night except i bought each peice individually bcs I wanted black coated and didn’t want crank pulley. They said belts will be back in stock ready to ship by Tuesday.

Just so I understand the Alternator and Waterpump are larger diameter which should cause some underdrive to free up power? Then for the crank you are doing a stock sized Fluidampr

[86TOYO2k17]

Originally Posted by SuperTom

Just so I understand the Alternator and Waterpump are larger diameter which should cause some underdrive to free up power? Then for the crank you are doing a stock sized Fluidampr

Yes, exactly. Alt is 10mm larger and water is 20mm larger for a 15% underdrive.

[gtengr]

Is the alternator under load while the car is accelerating? I've noticed that the voltage spikes when I let off the throttle.

[why?]

Originally Posted by SuperTom

That's what I hear stock hood is light as CF hood.

I also saw the CF roof saves about 9lbs, Looks expensive though especially after you factor in this would need professional installation.

The trunk is where we can do something as a DIY bolt on. Can't find any confirmed weights of stock trunk with stock boomerang wing. A real CF trunk while staying wingless should save a good chunk of weight, or adding back on a stock style or duckbill in real CF. The problem is most of these parts are sold to ricers who just want the cool appearance aspect. Its proving difficult to get any confirmed weights out there of the aftermarket trunks.

I know MPH fabrication posted a 4 lb trunk for an Impreza, I bet he could get something almost or just as light for a BRZ. He also listed his hood on here which weighs less than stock. Specific links are hard to come by, people say lots of things buy actual weights on these pieces are hard to come by.

Originally Posted by new2subaru

First I've read this.

Do you have a any links you can share?

It would be the last thing on the list but still interesting

Just the MPH one, he does some awesome stuff, you should check his website out. http://www.marshpowerhousefab.com/ Definitely going to buy everything from him when I can save up enough cash.

[valtore101]

Originally Posted by gtengr

Is the alternator under load while the car is accelerating? I've noticed that the voltage spikes when I let off the throttle.

Of course. It has to fire the spark plugs many times per second @ ~40kV per spark plug

[SuperTom]

Originally Posted by why?

I know MPH fabrication posted a 4 lb trunk for an Impreza, I bet he could get something almost or just as light for a BRZ. He also listed his hood on here which weighs less than stock. Specific links are hard to come by, people say lots of things buy actual weights on these pieces are hard to come by.



Just the MPH one, he does some awesome stuff, you should check his website out. http://www.marshpowerhousefab.com/ Definitely going to buy everything from him when I can save up enough cash.

yeah that's the roof I was talking about earlier. Very nice I wish I knew how much someone would charge to install or how to DIY. Hood is half the weight too, Id go for a simple stock style and drop the price to $1k

[gtengr]

Originally Posted by valtore101

Of course. It has to fire the spark plugs many times per second @ ~40kV per spark plug

The electrical system has to fire the plugs, but that electricity doesn't necessarily have to come from the alternator in real time.

[86TOYO2k17]

Originally Posted by SuperTom

Can you post a link to what parts you are looking to buy?

Curious where you put your slime kit? I tried to figure out a secure way to place it where the spare was, but ended up just wedging it behind the passenger seat.

With your shorai battery what is the longest you have gone without driving or being hooked up to the charger? After I get my pulleys in that’s prob next mod if I go that route. But sometimes I don’t drive car for days at a time.

Did you ever swap out steering wheel I think stock is 7lbs? And there are roughly 3lbs ones I think? Hard to find weights on aftermarket ones.

You see Anthony’s build? Anthony’s 4 steps to weight reduction. Dude went all out dropped 400lbs. His car is 22xx lbs.

[Dr. BRZ]

Originally Posted by 86TOYO2k17

Curious where you put your slime kit? I tried to figure out a secure way to place it where the spare was, but ended up just wedging it behind the passenger seat.

With your shorai battery what is the longest you have gone without driving or being hooked up to the charger? After I get my pulleys in that’s prob next mod if I go that route. But sometimes I don’t drive car for days at a time.

Did you ever swap out steering wheel I think stock is 7lbs? And there are roughly 3lbs ones I think? Hard to find weights on aftermarket ones.

You see Anthony’s build? Anthony’s 4 steps to weight reduction. Dude went all out dropped 400lbs. His car is 22xx lbs.

I have a 2lb shorai battery. I went 2 weeks without turning on the car and when i went to turn it on, it struggled it bit to turn on but it did. Autozone/oreillys do charge shorai batteries for free and ive dropped 300lbs!!
I have a 13 limited brz which weighs heavier than a base frs.

[86TOYO2k17]

Originally Posted by Dr. BRZ

I have a 2lb shorai battery. I went 2 weeks without turning on the car and when i went to turn it on, it struggled it bit to turn on but it did. Autozone/oreillys do charge shorai batteries for free and ive dropped 300lbs!!
I have a 13 limited brz which weighs heavier than a base frs.

Good to know, I’d be getting the biggest 3.5lb for me insurance. How long have you had it? And what’s the coldest you’ve used it? Spring/fall easily get down to upper 40s here. If I had to swap out would prefer if it could at least make it 9months out of year.

[SuperTom]

Originally Posted by 86TOYO2k17

Curious where you put your slime kit? I tried to figure out a secure way to place it where the spare was, but ended up just wedging it behind the passenger seat.

With your shorai battery what is the longest you have gone without driving or being hooked up to the charger? After I get my pulleys in that’s prob next mod if I go that route. But sometimes I don’t drive car for days at a time.

Did you ever swap out steering wheel I think stock is 7lbs? And there are roughly 3lbs ones I think? Hard to find weights on aftermarket ones.

You see Anthony’s build? Anthony’s 4 steps to weight reduction. Dude went all out dropped 400lbs. His car is 22xx lbs.

With the spare tire removed the slime/pump kit is just kinda tucked under the back passenger corner near the taillight. I have 2 pillows in place of the spare and I still kept the spare tire lid. Even with weight reduction the car is still functional enough to haul groceries! The pillows help support the lid and also keep the noise down without adding weight.

The car has easily gone 5 days,started while parked in the airport no problem. Can probably go longer. I keep that cellphone looking jumper about 1lb in the glovebox just in case.

Yes steering wheel is on the list after I decide on seats with buddy club mounts. I've narrowed it down to 2 options

1.Cheaper route NRG CF seats 13lbs and NRG steering wheel
https://www.carid.com/nrg-innovation...cing-seat.html
https://www.carid.com/nrg-innovation...36mb-s-sl.html

2. More expensive Route Sparco QRT-R (9.9lb shell probably close to 13lbs with cushions) and Sparco - L777 Steering wheel
https://www.carid.com/sparco/racing-...008005rnr.html
https://www.carid.com/sparco/l777-pi...ing-wheel.html

Order of operations is getting ACE headers in next weekend and getting the tune dial in with Delicious.
After that I will decide on which route to go with the seats. Either option with Buddy club sliders will save me 17-21lbs per seat. Should be enough to get me right at 2500lbs.

Steering wheel will be last as I do like the '17 smaller wheel. If I do steering wheel I will also do the remaining airbags (roof, Passenger) total should give me another 10-15lbs MASS reduction.

Have read Anthonys thread many times and its a great inspiration that small pieces can really add up in the end. However I will never go as far as stripping out the whole interior and that exhaust is ridiculously loud. Appearance wise my car will still look stockish to the naked eye and be daily driveable.

I know after the seats get me to 2500lbs the next 50lbs will be difficult.
I can get to 2450 by
1. Steering wheel, total airbag removal
2. Working on lighter rear brake kit similar to the wildwood one I have upfront, possibly at expense of loosing E-brake (but seen Wilwood sells a small ebrake caliper at 6lbs)
3.Going a little lighter on the exhaust. ACE headers will already give me 5 less lbs upfront compared to the gruppe-S. And my HKS legamax is only 1 lbs lighter than stock. Really considering that HKS Spec-L. I will have to see how everything sounds with the new headers.

Also did more research on sway bars.
Cusco Fr 16mm, Rear 14mm will be lighter just from being smaller but I Don't know how much.
Tanabe will get you larger without any much weight at all. FR 22mm will gain you .5lbs , R 18mm will gain .25lbs because they are hollow. Weight source found here:
https://www.moddit.com/Guide/How+to+...+Subaru+BRZ/58
https://www.moddit.com/Guide/How+to+...+Subaru+BRZ/49
Basically not much to lose here will leave stock for now. But would go Tanabe if I want to get stiffer without gaining weight


Man I can spend hours talking and researching weight reduction. I was whipping the 86 to work today and the response & quickness is Amazing! Excited that I can still get another ~90lbs out of this thing and make it even better. My C5 at ~3250 lbs is starting to feel like a pig

[Lantanafrs2]

I would love to see acceleration numbers once you put the header on it. Weight loss you're talking about is worth 20 or so hp by itself.

[nikitopo]

Originally Posted by Lantanafrs2

I would love to see acceleration numbers once you put the header on it. Weight loss you're talking about is worth 20 or so hp by itself.

I am with you guys, but when I posted my acceleration numbers almost everyone was saying that the sample of the test runs was not enough ( 2 before and 2 after), that the conditions were unknown and it could have wind (we rarely have wind here), that I didn't drive the same road in both directions (I checked with high precision gps its levelness) and whatever else you can imagine. So, be prepared of some nonsense and different kind of "expert" opinions.