Spirited driving fail? Over rev? - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

nikitopo · 05-20-2017, 01:42 AM

Quote:

Originally Posted by Tcoat

I want some cookies too

Tcoat · 05-20-2017, 02:10 AM

Quote:

Originally Posted by nikitopo

I want some cookies too

stevesnj · 05-20-2017, 11:58 AM

Talking about downshifting to 2nd by mistake, ironically here's a video showing a 2017 doing just that. It's part of an understeer/oversteer explanation video.

Time 3:59

[ame="https://www.youtube.com/watch?v=EwmDdMzzDjY"]https://www.youtube.com/watch?v=EwmDdMzzDjY[/ame]

Ultramaroon · 05-20-2017, 01:27 PM

Quote:

Originally Posted by stevesnj

Talking about downshifting to 2nd by mistake, ironically here's a video showing a 2017 doing just that. It's part of an understeer/oversteer explanation video.

Time 3:59

It's basically lift oversteer x10. That's all.

Kodename47 · 05-20-2017, 02:32 PM

Over rev of the engine does damage (usually) due to valve springs or similar that can't handle the excessive speed above the designed parameters. This leads to one or more of weakened valve springs, broken springs, immediate valve float, weakened valve rockers. A number of these can lead to fatigue that fails over time or immediate failure causing interference with the piston that causes a valve to exit or something equally bad.

There is no issue shifting like that so long as you don't push the components past what they are able to handle, that video that @nikitopo posted probably has updated springs etc so can handle the extra abuse thrown at it.

steve99 · 05-20-2017, 03:50 PM

rocker valve train fails

x808drifter · 05-20-2017, 04:24 PM

Quote:

Originally Posted by Tcoat

They can't over rev if they don't granny shift and double clutch like they are supposed too.

Why not just swap he valvetrain out of a Gallo24?
That thing is bulletproof.

TommyW · 05-20-2017, 04:29 PM

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nikitopo · 05-21-2017, 02:04 AM

Quote:

Originally Posted by Kodename47

There is no issue shifting like that so long as you don't push the components past what they are able to handle, that video that @nikitopo posted probably has updated springs etc so can handle the extra abuse thrown at it.

The engine is the Japanese-market STI spec.c’s, a 2.0-liter turbocharged boxer-four that’s been given the larger turbo from the R205. No other changes.

Quote:

Originally Posted by steve99

rocker valve train fails

It depends also how this car was driven. I would be worried more to keep the RPMs close to the redline for a long time, than to have an occasional over-revving.

JimmyMac · 05-22-2017, 01:15 AM

Those are two separate cars. Both turbo'd. Top 2 pics were mine. All 3 pics off FB. Mine was 6500rpm extended time and jumping on it in 2nd. Clanking then pop. I think the last one was also high rpm as well. Mine is early 2013 build.

steve99 · 05-22-2017, 07:57 AM

Thousands of guys track these cars with stock engine and rev them from 5000- redline consistently for entire tract or autocross session s. And their are very few that blow up.

reeves · 05-22-2017, 08:24 AM

There are some of us who've been revving up to 8K RPM on stock internals for the last 60K miles (on E85) without blowing their engines either.

nikitopo · 05-22-2017, 08:35 AM

Quote:

Originally Posted by steve99

Thousands of guys track these cars with stock engine and rev them from 5000- redline consistently for entire tract or autocross session s. And their are very few that blow up.

Close to the redline for a long time is something like holding 6500rpm or higher for extended time. We can see such issues here in autobahn where someone might keep top speed constantly in 5th gear instead of 6th gear for better acceleration. If you just rev the engine and change immediately to higher gear is fine.

nikitopo · 05-22-2017, 08:37 AM

Quote:

Originally Posted by reeves

There are some of us who've been revving up to 8K RPM on stock internals for the last 60K miles (on E85) without blowing their engines either.

E85 is also much better for our engines, but unfortunately not many gas stations available.

05-20-2017, 11:58 AM	#59
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s)	Talking about downshifting to 2nd by mistake, ironically here's a video showing a 2017 doing just that. It's part of an understeer/oversteer explanation video. Time 3:59 [ame="https://www.youtube.com/watch?v=EwmDdMzzDjY"]https://www.youtube.com/watch?v=EwmDdMzzDjY[/ame] __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

05-20-2017, 02:32 PM	#61
Kodename47 Senior Member Join Date: Oct 2012 Drives: UK GT86 Location: UK Posts: 3,040 Thanks: 185 Thanked 1,633 Times in 1,113 Posts Mentioned: 156 Post(s)	Over rev of the engine does damage (usually) due to valve springs or similar that can't handle the excessive speed above the designed parameters. This leads to one or more of weakened valve springs, broken springs, immediate valve float, weakened valve rockers. A number of these can lead to fatigue that fails over time or immediate failure causing interference with the piston that causes a valve to exit or something equally bad. There is no issue shifting like that so long as you don't push the components past what they are able to handle, that video that @nikitopo posted probably has updated springs etc so can handle the extra abuse thrown at it. __________________ .: Stealth 86 :. Abbey Motorsport/K47 Tuned Sprintex 210 Supercharger Kodename 47 DJ: Soundcloud / Instagram / Facebook

05-20-2017, 03:50 PM	#62
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,997 Times in 2,985 Posts Mentioned: 598 Post(s)	rocker valve train fails Attached Images

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05-20-2017, 04:29 PM	#64
TommyW Senior Member Join Date: Feb 2017 Drives: '13 Whiteout Location: San Clemente Posts: 1,493 Thanks: 496 Thanked 1,245 Times in 674 Posts Mentioned: 10 Post(s)

05-22-2017, 01:15 AM	#66
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s)	Those are two separate cars. Both turbo'd. Top 2 pics were mine. All 3 pics off FB. Mine was 6500rpm extended time and jumping on it in 2nd. Clanking then pop. I think the last one was also high rpm as well. Mine is early 2013 build.

05-22-2017, 07:57 AM	#67
steve99 Banned Join Date: Dec 2013 Drives: FT86 Location: Australia Posts: 7,996 Thanks: 1,035 Thanked 4,997 Times in 2,985 Posts Mentioned: 598 Post(s)	Thousands of guys track these cars with stock engine and rev them from 5000- redline consistently for entire tract or autocross session s. And their are very few that blow up.

05-22-2017, 08:24 AM	#68
reeves Senior Member Join Date: Jul 2012 Drives: BRZ Location: ATL, GA Posts: 1,020 Thanks: 289 Thanked 397 Times in 265 Posts Mentioned: 13 Post(s)	There are some of us who've been revving up to 8K RPM on stock internals for the last 60K miles (on E85) without blowing their engines either.

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