Clutch dump at 5000 RPM? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

fasteddy · 07-18-2012, 05:41 PM

In at least three reviews of the BRZ they talk about how to launch it. They all seem to conclude that dumping the clutch at 4500-5500 RPM is the best.

Well that seems kind of hard on the car to me. I have not tried it yet.

How about you guys? How long with the clutch last if you do that regularly?

Pat

GNS · 07-18-2012, 05:47 PM

Dumping the clutch regularly is not good for your car. For any car. Don't know why you'd want to do it regularly.

tjdiz92 · 07-18-2012, 05:57 PM

there is no situation where you could possibly dump the clutch REGULARLY but you have to do some pretty fancy feathering when you dump the clutch at that high. I'm real inexperienced did that and just did a pretty nice burnout. I launched best at 3500

jeebus · 07-18-2012, 07:18 PM

((RPM / curb weight) * # gears) * # tires driven = 22 times ok?

SUB-FT86 · 07-18-2012, 07:25 PM

IMO the true acceleration of this car happens to be launching this car around 3k rpms. I saw a video of a manual BRZ launching at 3k rpms and it got to 60 in 6.8-6.9 seconds.

Opposed · 07-18-2012, 08:16 PM

Quote:

Originally Posted by SUB-FT86

IMO the true acceleration of this car happens to be launching this car around 3k rpms. I saw a video of a manual BRZ launching at 3k rpms and it got to 60 in 6.8-6.9 seconds.

that's pretty slow still. Motortrend did a 5k launch and got 6.2. Another company on here did redline launches at the drag strip and did a 14.7

SUB-FT86 · 07-19-2012, 07:08 AM

Quote:

Originally Posted by Opposed

that's pretty slow still. Motortrend did a 5k launch and got 6.2. Another company on here did redline launches at the drag strip and did a 14.7

Yeah but I was talking about playing it safe on a daily basis.

Dave-ROR · 07-19-2012, 08:05 AM

Around 4.5-5 was best for me with 235 ad08s so 3.5 sounds faIr for the junk oem tires.

Opposed · 07-19-2012, 08:16 AM

Quote:

Originally Posted by SUB-FT86

Yeah but I was talking about playing it safe on a daily basis.

Understood. It's a gamble either way. One guy might break something on the first dump, and another guy 8 years from now with 100k miles on it will done several clutch dumps and have no issues. Its one of those things to me that is hard to measure the wear. To many variables. Like when people say redlining your car causes more engine wear. I redlined my S2k a couple times a day for the 5 years I had it and 100k miles, and compression test and leak down was perfect before I traded it in.

LSxJunkie · 07-19-2012, 01:23 PM

All hard launches are rough on the car. A high rpm quick slip is for drag racing. You only need to do this at a prepped strip.

B1FR-S · 08-22-2013, 10:43 AM

Quote:

Originally Posted by LSxJunkie

All hard launches are rough on the car. A high rpm quick slip is for drag racing. You only need to do this at a prepped strip.

So what is a quick slip??

DarkSunrise · 08-22-2013, 10:50 AM

Some of the more serious autocross guys have done dozens of hard launches on sticky 245+ width street tires so they should have some insight on this. I believe axles might be an issue.

The last time I autocrossed, I did a hard launch at 3500 rpm on mild 215 width street tires and got mostly wheelspin in 1st. That was pointed slightly uphill too.

Thorpedo · 08-22-2013, 11:14 AM

If you're talking "clutch dumping" it really makes you look like a goof.

As for properly launching the car, I run 245/40 Bridgestone RE-11A in Autocross and I launch it at 4000. There is no "dumping" the clutch, I feather it while keeping as close to wot as possible and accelerating as fast as possible without spinning the tires. 5000 would be better as the engine would be out of the "torque dip" and you would achieve the best possible launches there. I just limit my launches at 4 and save the wear and tear and take the .1 second loss.

Properly launching the car just wears your clutch faster, "dumping" it is slow and with sticky tires you will break things.

WolfpackS2k · 08-22-2013, 11:35 AM

I autoxed my Integra GS-R (140-190k miles on the odometer) for 4 full seasons and would usually launch around 4000 rpm. At the drag strip (15-20 runs total) I would launch around 6000 rpm. And just for kicks a few times on the street I've launched as high as 7000 rpm. Never had any related drivetrain wear issues. I had the inner axles replaced 6 months ago (car currently has 300k) but that's normal at this point. Also I've got over 150k on this clutch, and still doesn't slip (OEM clutch, 2nd on this car).

I think the BRZ should be fine launching at 4000-5000 rpm without having to worry about drivetrain components. However I would be leery of Subaru agreeing and honoring the warranty "IF" something were to break.

07-18-2012, 05:41 PM	#1
fasteddy Senior Member Join Date: Jun 2012 Drives: BRZ Location: MN Posts: 184 Thanks: 89 Thanked 82 Times in 41 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Clutch dump at 5000 RPM? In at least three reviews of the BRZ they talk about how to launch it. They all seem to conclude that dumping the clutch at 4500-5500 RPM is the best. Well that seems kind of hard on the car to me. I have not tried it yet. How about you guys? How long with the clutch last if you do that regularly? Pat

07-18-2012, 05:57 PM	#3
tjdiz92 Member Join Date: Jun 2012 Drives: 2013 Argento FR-S MT Location: Central Jersey Posts: 78 Thanks: 10 Thanked 21 Times in 17 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	there is no situation where you could possibly dump the clutch REGULARLY but you have to do some pretty fancy feathering when you dump the clutch at that high. I'm real inexperienced did that and just did a pretty nice burnout. I launched best at 3500 __________________ 2013 Argento Scion FR-S M/T 15% tint-6k HID headlights-6k HID blinker Switch backs-LED domelight-LED reverse lights-LED license plate light-Gloss black roof-Hertz audio components w/ 2 10 inch kicker L'3s.

07-19-2012, 08:05 AM	#8
Dave-ROR Site Moderator Join Date: Dec 2010 Drives: Stuff Location: Florida Posts: 10,317 Thanks: 955 Thanked 5,965 Times in 2,689 Posts Mentioned: 262 Post(s) Tagged: 8 Thread(s)	Around 4.5-5 was best for me with 235 ad08s so 3.5 sounds faIr for the junk oem tires. __________________ -Dave Track cars: 2013 Scion FRS, 1998 Acura Integra Type-R, 1993 Honda Civic Hatchback DD: 2005 Acura TSX Tow: 2022 F-450 Toys: 2001 Chevrolet Corvette Z06, 1993 Toyota MR2 Turbo, 1994 Toyota MR2 Turbo, 1991 Mitsubishi Galant VR-4 Parts: 2015 Subaru BRZ Limited, 2005 Acura TSX Projects: 2013 Subaru BRZ Limited track car build FS: 2004 GMC Sierra 2500 LT CCSB 8.1/Allison with 99k miles

07-19-2012, 01:23 PM	#10
LSxJunkie Douchebag Join Date: Dec 2011 Drives: 2014 Mustang GT Location: NY Posts: 1,047 Thanks: 283 Thanked 403 Times in 214 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	All hard launches are rough on the car. A high rpm quick slip is for drag racing. You only need to do this at a prepped strip. __________________ Here - 2014 Mustang GT Track Package/Recaros - Koni Yellows, Boss 302 Springs, BMR SB041 Front Sway Bar, Boss 302 Rear Sway Bar, Boss 302 Wheels, GT500 Quad Tip Axleback, 2016 Legacy 2.5i Limited Gone - 2010 RX350, 2006 GTO (2nd), 2007 RX350, 2008 IS250AWD, 2006 GTO, 2004 G35 6MT, 1992 SC400

08-22-2013, 10:50 AM	#12
DarkSunrise Senior Member Join Date: Apr 2012 Drives: 22 BRZ (Previously 13 FR-S) Location: USA Posts: 5,794 Thanks: 2,164 Thanked 4,242 Times in 2,220 Posts Mentioned: 48 Post(s) Tagged: 2 Thread(s)	Some of the more serious autocross guys have done dozens of hard launches on sticky 245+ width street tires so they should have some insight on this. I believe axles might be an issue. The last time I autocrossed, I did a hard launch at 3500 rpm on mild 215 width street tires and got mostly wheelspin in 1st. That was pointed slightly uphill too. __________________ "Never run out of real estate, traction, and ideas at the same time." 2022 BRZ Build 2013 FR-S Build

07-18-2012, 05:47 PM	#2
GNS Senior Member Join Date: Jul 2012 Drives: . Location: Ontario Posts: 350 Thanks: 28 Thanked 223 Times in 105 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Dumping the clutch regularly is not good for your car. For any car. Don't know why you'd want to do it regularly.

07-18-2012, 07:18 PM	#4
jeebus Senior Member Join Date: Jul 2012 Drives: 2015 Mustang GT (on order) Location: San Diego Posts: 904 Thanks: 114 Thanked 471 Times in 208 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	((RPM / curb weight) * # gears) * # tires driven = 22 times ok?

07-18-2012, 07:25 PM	#5
SUB-FT86 86 Member Join Date: Dec 2010 Drives: 2013 Toyota 86 2.0T (Asphalt) Location: Atlanta, Ga Posts: 3,129 Thanks: 126 Thanked 527 Times in 296 Posts Mentioned: 2 Post(s) Tagged: 2 Thread(s)	IMO the true acceleration of this car happens to be launching this car around 3k rpms. I saw a video of a manual BRZ launching at 3k rpms and it got to 60 in 6.8-6.9 seconds.

08-22-2013, 11:14 AM	#13
Thorpedo The SquadWhisperer Join Date: Mar 2013 Drives: '13 Ultramarine FR-S (STX) Location: Nova Scotia, Canada Posts: 681 Thanks: 383 Thanked 477 Times in 207 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	If you're talking "clutch dumping" it really makes you look like a goof. As for properly launching the car, I run 245/40 Bridgestone RE-11A in Autocross and I launch it at 4000. There is no "dumping" the clutch, I feather it while keeping as close to wot as possible and accelerating as fast as possible without spinning the tires. 5000 would be better as the engine would be out of the "torque dip" and you would achieve the best possible launches there. I just limit my launches at 4 and save the wear and tear and take the .1 second loss. Properly launching the car just wears your clutch faster, "dumping" it is slow and with sticky tires you will break things.

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