FD upgrade on supercharged - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

azynneo · 11-09-2015, 01:44 AM

What do you guys think of a FD upgrade on a innovate SC? Think it'll run through the RPMS too quickly?

I do have an A/T as well and I've heard huge improvements in acceleration on a stock motor. Want some input on this

*Note, I posted this in forced induction as well but I'm not sure where this topic should've went.

Dustin · 11-09-2015, 01:55 AM

I have it on mine.

Dustin · 11-09-2015, 01:57 AM

Look at my DIY link in my signature, scroll past the first post which is all of the DIY, and read the 3rd post.

azynneo · 11-09-2015, 02:26 AM

Quote:

Originally Posted by Dustin

Look at my DIY link in my signature, scroll past the first post which is all of the DIY, and read the 3rd post.

gave that a read through, thanks for the opinion man.

What about those on A/T?

I'm honestly thinking of the 4.88 but looking at the torque curve we have on the supercharger, it doesn't seem like any benefit at all. What do you think dustin?

BRZoomTX · 11-09-2015, 10:01 AM

I'll be running a m85 diff off a is300 on mine with the 3.73 rear. You're going the opposite direction with your final drive.

You want a longer final drive on boosted cars, that way you are staying in your power band longer. Unless you are running auto X you really do not need a final drive as crazy as 4.88. Your initial acceleration would be OK but your top end will really drop off very quickly.

The high final drives are best for a N/A car. Running boost with a supercharger you will see the best overall results with a lower (longer) final drive.

Sleepless · 11-09-2015, 11:42 AM

Agreed with BRZoomTX. If you want street/AX acceleration, then, I can see going with a shorter final drive. But, if you are into road coarse track driving, you need to pick a FD that keeps you in the lower gears as long as possible and definitely avoid need to shift to 6th which is too tall to be useful on track.

I've also been considering something like a 3.73 since most of the tracks I go to have quite high top speeds and I'm right at needing to shift to 6th.

CSG Mike · 11-09-2015, 02:52 PM

If you have an AT, it's worthwhile. With an MT, I wouldn't recommend it unlses you have a very, very specific reason.

11-09-2015, 01:44 AM	#1
azynneo Senior Member Join Date: Jan 2014 Drives: FR-S Location: Cali Posts: 582 Thanks: 50 Thanked 44 Times in 34 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	FD upgrade on supercharged What do you guys think of a FD upgrade on a innovate SC? Think it'll run through the RPMS too quickly? I do have an A/T as well and I've heard huge improvements in acceleration on a stock motor. Want some input on this *Note, I posted this in forced induction as well but I'm not sure where this topic should've went.

11-09-2015, 01:55 AM	#2
Dustin Twin Screw You Join Date: Nov 2012 Drives: 2013 Supercharged Whiteout FR-S Location: Burleson, Texas Posts: 1,231 Thanks: 464 Thanked 620 Times in 332 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	I have it on mine. __________________ My 86 Differential and Ring & Pinion DIY

11-09-2015, 01:57 AM	#3
Dustin Twin Screw You Join Date: Nov 2012 Drives: 2013 Supercharged Whiteout FR-S Location: Burleson, Texas Posts: 1,231 Thanks: 464 Thanked 620 Times in 332 Posts Mentioned: 37 Post(s) Tagged: 0 Thread(s)	Look at my DIY link in my signature, scroll past the first post which is all of the DIY, and read the 3rd post. __________________ My 86 Differential and Ring & Pinion DIY

11-09-2015, 10:01 AM	#5
BRZoomTX Senior Member Join Date: Mar 2015 Drives: '13 BRZ Location: Texas Posts: 362 Thanks: 179 Thanked 235 Times in 149 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	I'll be running a m85 diff off a is300 on mine with the 3.73 rear. You're going the opposite direction with your final drive. You want a longer final drive on boosted cars, that way you are staying in your power band longer. Unless you are running auto X you really do not need a final drive as crazy as 4.88. Your initial acceleration would be OK but your top end will really drop off very quickly. The high final drives are best for a N/A car. Running boost with a supercharger you will see the best overall results with a lower (longer) final drive. __________________ '13 WRB BRZ ~470whp // Instagram // YouTube

11-09-2015, 11:42 AM	#6
Sleepless Senior Member Join Date: Apr 2014 Drives: 2014 BRZ Location: Redmond, WA Posts: 639 Thanks: 299 Thanked 392 Times in 229 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Agreed with BRZoomTX. If you want street/AX acceleration, then, I can see going with a shorter final drive. But, if you are into road coarse track driving, you need to pick a FD that keeps you in the lower gears as long as possible and definitely avoid need to shift to 6th which is too tall to be useful on track. I've also been considering something like a 3.73 since most of the tracks I go to have quite high top speeds and I'm right at needing to shift to 6th. __________________ Pete 14 Track BRZ (Build Thread) cmslaptimer.com

11-09-2015, 02:52 PM	#7
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,529 Thanks: 8,918 Thanked 14,175 Times in 6,834 Posts Mentioned: 966 Post(s) Tagged: 14 Thread(s)	If you have an AT, it's worthwhile. With an MT, I wouldn't recommend it unlses you have a very, very specific reason.

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