follow ft86club on our blog, twitter or facebook.
FT86CLUB
Ft86Club
Delicious Tuning
Register Garage Members List Calendar Search Today's Posts Mark Forums Read

Go Back   Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB > Technical Topics > Engine, Exhaust, Transmission

Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


User Tag List

Reply
 
Thread Tools Search this Thread
Old 10-16-2017, 05:01 PM   #1
Strife26
Senior Member
 
Strife26's Avatar
 
Join Date: Sep 2014
Drives: 2015 Subaru BRZ Series.blue
Location: Redding, CA
Posts: 651
Thanks: 1,076
Thanked 150 Times in 115 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Anyone Have Lightweight Flywheel + Pulley + Driveshaft?

I have a lw pulley and flywheel. The RPMs rise and drop pretty quickly. I wanted to get a lightweight driveshaft but wanted to see if anyone had all 3 that can speak of how the car is with all 3. It is night and day difference with just the flywheel. It takes getting used to, but it is definitely better than stock.
Is there such a thing as too much when it comes to the speed at which the RPMs rise and fall in your opinion? Does it ruin driveability for you/in your opinion?

Thanks for any responses.
__________________
Please only adult answers.
I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.
Strife26 is offline   Reply With Quote
Old 10-16-2017, 05:32 PM   #2
StraightOuttaCanadaEh
Wes
 
Join Date: Feb 2017
Drives: Artisan Spirits '17 86
Location: Toronto
Posts: 2,789
Thanks: 1,162
Thanked 1,673 Times in 993 Posts
Mentioned: 21 Post(s)
Tagged: 0 Thread(s)
Well the LFA revs up and down so quickly that the analog needle can't keep up, which is why it's got a TFT screen with a digital needle. I figure if the engine spinning up and down works for LFA drivers, should work for us too. I thought the pulleys were more of a placebo effect to be honest. Did you do the pulleys before the flywheel?
StraightOuttaCanadaEh is offline   Reply With Quote
Old 10-16-2017, 06:02 PM   #3
Strife26
Senior Member
 
Strife26's Avatar
 
Join Date: Sep 2014
Drives: 2015 Subaru BRZ Series.blue
Location: Redding, CA
Posts: 651
Thanks: 1,076
Thanked 150 Times in 115 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by StraightOuttaCanadaEh View Post
Well the LFA revs up and down so quickly that the analog needle can't keep up, which is why it's got a TFT screen with a digital needle. I figure if the engine spinning up and down works for LFA drivers, should work for us too. I thought the pulleys were more of a placebo effect to be honest. Did you do the pulleys before the flywheel?
Ya. I want to say it was noticeable, but maybe it was placebo. It felt like it fell .5 to 1 second faster than stock, not much, but something.

I am tempted to buy the driveshaft just cause, but I can't decide if it's worth it. So many different opinions on driveshafts...
__________________
Please only adult answers.
I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.
Strife26 is offline   Reply With Quote
Old 10-16-2017, 06:26 PM   #4
mkivsoopra
Senior Member
 
Join Date: Dec 2012
Drives: BRZ
Location: CA
Posts: 805
Thanks: 939
Thanked 950 Times in 412 Posts
Mentioned: 161 Post(s)
Tagged: 1 Thread(s)
I had all 3 at one point. The flywheel makes the most difference. The other stuff, not so much.
mkivsoopra is offline   Reply With Quote
The Following 3 Users Say Thank You to mkivsoopra For This Useful Post:
Strife26 (10-16-2017), SuperTom (02-27-2020), Yoniyama (10-28-2017)
Old 10-16-2017, 06:37 PM   #5
Strife26
Senior Member
 
Strife26's Avatar
 
Join Date: Sep 2014
Drives: 2015 Subaru BRZ Series.blue
Location: Redding, CA
Posts: 651
Thanks: 1,076
Thanked 150 Times in 115 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by mkivsoopra View Post
I had all 3 at one point. The flywheel makes the most difference. The other stuff, not so much.
Thanks!

Driveshaft worth it? Just looking for the next part(s) under 1k. I can go with suspension mods instead and maybe consider the driveshaft later. The flywheel is probably plenty fine since it's such a huge difference.
__________________
Please only adult answers.
I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.
Strife26 is offline   Reply With Quote
Old 10-16-2017, 07:03 PM   #6
Somerandom18
Senior Member
 
Join Date: Sep 2016
Drives: 2017 manual BRZ
Location: USA
Posts: 467
Thanks: 322
Thanked 178 Times in 111 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
I went from stock to lightweight pulley to a heavier than stock fluidampr and had to try really hard to notice a difference between all 3.

Sent from my Pixel XL using Tapatalk
Somerandom18 is offline   Reply With Quote
Old 10-16-2017, 07:20 PM   #7
Strife26
Senior Member
 
Strife26's Avatar
 
Join Date: Sep 2014
Drives: 2015 Subaru BRZ Series.blue
Location: Redding, CA
Posts: 651
Thanks: 1,076
Thanked 150 Times in 115 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Somerandom18 View Post
I went from stock to lightweight pulley to a heavier than stock fluidampr and had to try really hard to notice a difference between all 3.

Sent from my Pixel XL using Tapatalk
That is what I have heard. I considered the harmonic balanced pulleys, but as always, there is so many differing opinions on them. I have had my cheapo lightweight pulley for almost 2 years now and as far as I know there are no issues. 45k+ miles on the car, at least half were from with the lw pulley.
__________________
Please only adult answers.
I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.
Strife26 is offline   Reply With Quote
Old 10-16-2017, 07:21 PM   #8
mkivsoopra
Senior Member
 
Join Date: Dec 2012
Drives: BRZ
Location: CA
Posts: 805
Thanks: 939
Thanked 950 Times in 412 Posts
Mentioned: 161 Post(s)
Tagged: 1 Thread(s)
Quote:
Originally Posted by Strife26 View Post
Thanks!

Driveshaft worth it? Just looking for the next part(s) under 1k. I can go with suspension mods instead and maybe consider the driveshaft later. The flywheel is probably plenty fine since it's such a huge difference.
What's your goal/purpose? If it's just to rev quicker for fun, I'd skip the driveshaft.
mkivsoopra is offline   Reply With Quote
Old 10-16-2017, 07:37 PM   #9
Strife26
Senior Member
 
Strife26's Avatar
 
Join Date: Sep 2014
Drives: 2015 Subaru BRZ Series.blue
Location: Redding, CA
Posts: 651
Thanks: 1,076
Thanked 150 Times in 115 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by mkivsoopra View Post
What's your goal/purpose? If it's just to rev quicker for fun, I'd skip the driveshaft.
I was just looking at my next upgrade. I just got a new clutch/flywheel and it's changed the tach significantly. Takes getting used to, but I like it.

So my goal is just figuring out what to buy next.

Suspension mods (minus coilovers)
Brakes (probably too pricey until I get turbo)
Rotors/pads
Rocket bunny stuff (maybe, still up in the air if I want to chop my car up)
Aesthetics...

I'm just browsing for the next small <$1k project.

I have:
Wheels + lugs
Coilovers
Short throw
Pulley kit
clutch/flywheel
full exhaust
OFT
Intake (just cause)
Valentis
mud flaps (looks)
and a couple little things here and there.

So I was considering the driveshaft to keep the upgrades moving along, but was wondering if it's worth it at all, now or later to get the driveshaft.
__________________
Please only adult answers.
I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.
Strife26 is offline   Reply With Quote
Old 10-16-2017, 07:49 PM   #10
mkivsoopra
Senior Member
 
Join Date: Dec 2012
Drives: BRZ
Location: CA
Posts: 805
Thanks: 939
Thanked 950 Times in 412 Posts
Mentioned: 161 Post(s)
Tagged: 1 Thread(s)
Quote:
Originally Posted by Strife26 View Post
...

So I was considering the driveshaft to keep the upgrades moving along, but was wondering if it's worth it at all, now or later to get the driveshaft.
Nope :p
mkivsoopra is offline   Reply With Quote
Old 10-16-2017, 08:47 PM   #11
Spuds
The Dictater
 
Spuds's Avatar
 
Join Date: Apr 2017
Drives: '13 Red Scion FRS
Location: MD, USA
Posts: 9,386
Thanks: 26,018
Thanked 12,389 Times in 6,120 Posts
Mentioned: 85 Post(s)
Tagged: 0 Thread(s)
I did some calculations a while back regarding what kind of inertial losses you can recover by going to lighter weight rotational parts. Translated into hp, I think a cf driveshaft should have the same effect as adding about 2hp in a second gear pull. Less in 3rd, more in 1st. That's just estimated rotational losses with some assumptions. I didn't go back and do the hard math to factor in changes in acceleration and recalculate. I'll look up that spreadsheet next time I get on my PC to confirm.

Edit: cf driveshaft gets you about 1.5hp back in second, a -7lb from stock flywheel gets you 6.

Last edited by Spuds; 10-17-2017 at 10:42 PM.
Spuds is offline   Reply With Quote
The Following User Says Thank You to Spuds For This Useful Post:
Strife26 (10-17-2017)
Old 10-16-2017, 10:23 PM   #12
Dr. BRZ
Senior Member
 
Dr. BRZ's Avatar
 
Join Date: Aug 2012
Drives: 2013 WR Blue Pearl BRZ Limited 6MT.
Location: Oklahoma City, OK.
Posts: 756
Thanks: 44
Thanked 217 Times in 149 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Garage
I have all 3 plus lw wheels and gutted interior, I got the aluminum driveshaft last and yes you can feel the difference!
Dr. BRZ is offline   Reply With Quote
The Following User Says Thank You to Dr. BRZ For This Useful Post:
Strife26 (10-17-2017)
Old 10-17-2017, 02:31 AM   #13
Captain Snooze
Because compromise ®
 
Captain Snooze's Avatar
 
Join Date: Jan 2012
Drives: Red Herring
Location: australia
Posts: 7,706
Thanks: 3,982
Thanked 9,303 Times in 4,116 Posts
Mentioned: 60 Post(s)
Tagged: 0 Thread(s)
Firstly. There is a critical mass of flywheel (that is, going too light) when combined with lwcp can result in engine failure. This was posted by a respected tuner on these forums but I can't be bothered looking for it.
Secondly. I am hypothesising that rpm drop is ecu limited. If the throttle closes too quickly emissions go up.
Third. Carbon drive shaft is great for total weight saving not so much for reduced angular inertia.
Fourth. Lighter wheels make a great contribution to everything. Well, not everything but they reduce total mass, reduce angular inertia, reduce unsprung weight. Makes no difference to the GDP of Finland.
__________________
My car is completely stock except for all the mods.

Captain Snooze is offline   Reply With Quote
The Following 3 Users Say Thank You to Captain Snooze For This Useful Post:
chaoskaze (10-28-2017), gtengr (10-17-2017), Strife26 (10-17-2017)
Old 10-17-2017, 06:48 PM   #14
Strife26
Senior Member
 
Strife26's Avatar
 
Join Date: Sep 2014
Drives: 2015 Subaru BRZ Series.blue
Location: Redding, CA
Posts: 651
Thanks: 1,076
Thanked 150 Times in 115 Posts
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quote:
Originally Posted by Captain Snooze View Post
Firstly. There is a critical mass of flywheel (that is, going too light) when combined with lwcp can result in engine failure. This was posted by a respected tuner on these forums but I can't be bothered looking for it.
Secondly. I am hypothesising that rpm drop is ecu limited. If the throttle closes too quickly emissions go up.
Third. Carbon drive shaft is great for total weight saving not so much for reduced angular inertia.
Fourth. Lighter wheels make a great contribution to everything. Well, not everything but they reduce total mass, reduce angular inertia, reduce unsprung weight. Makes no difference to the GDP of Finland.
I always try to get the lightest wheels. I had 17.5lbs Kosei's K8R, then got 18x9.5. I think they are 20 or 21lbs each : (. Lightweight wheels get way too pricey at that size for my liking.

I could see the shaft causing trouble. The flywheel drops the RPMs in a split second as opposed to 1-3 (maybe 4) seconds. It's stupid fast now. It also alters the sound because of how quickly it drops. Vrm instead of Vrrrrrm lol.
__________________
Please only adult answers.
I'm stupid, retarded, a fkn idiot, and I will kill myself after a couple answers, I already know this (thanks to the interwebs and its logic) so feel free to leave those responses out, thanks.
Strife26 is offline   Reply With Quote
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Lightweight vs OEM flywheel for FI FirestormFlex Forced Induction 23 09-25-2019 07:49 AM
Lightweight Driveshaft: worth it? Admired Engine, Exhaust, Transmission 15 10-02-2018 05:55 PM
ACT XT Street & Lightweight Flywheel Weasel Soup Engine, Exhaust, Transmission 8 03-21-2016 11:46 PM
Lightweight Flywheel + Crank Pulley: Bearing Failures? Anthony Engine, Exhaust, Transmission 23 01-24-2015 12:10 PM
Flywheel and Driveshaft Admired Engine, Exhaust, Transmission 37 06-09-2014 12:46 AM


All times are GMT -4. The time now is 03:57 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
User Alert System provided by Advanced User Tagging v3.3.0 (Lite) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.

Garage vBulletin Plugins by Drive Thru Online, Inc.