Who would want 12,000rpms to play with? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Irace86.2.0 · 12-29-2017, 12:37 PM

The 42psi turbo would be sweet, but 12,000rpms would be sweeter.

[ame="https://www.youtube.com/watch?v=1UwI-Rtuc38"]The 12,000rpm Subaru called Betty ðŸ˜² | Built by GotitRex - YouTube[/ame]

So destroking the engine...this would be removing stroke, so the piston doesn't travel as far. This reduces piston acceleration for a given rpm meaning there becomes a potential higher rev limit for the block. To do this one would need to build a custom set of light-weight, rods and a custom crank shaft, right, then build the head? The head would need some stiffer and lighter weight components like titanium springs, right? Would compression need to change? What needs to be changed for the transmission to handle the rpms?

-Willis-86touge · 12-29-2017, 02:01 PM

Fuel pump can only handle 8200 Rpms so was of time unless you change this too.

churchx · 12-29-2017, 02:18 PM

If you are speaking about FA20 engine in ours, you'll hit oiling problems way way before 12K rpm. In fact, you probably won't reach even 9000, at least if you care for engine to outlast one race, with 8200 being more probable upper limit.

strat61caster · 12-29-2017, 02:23 PM

Yeah but did they get rid of the torque dip?

mav1178 · 12-29-2017, 02:25 PM

better to just buy this motor:

https://www.facebook.com/hhatada/posts/1956904927668033

Ultramaroon · 12-29-2017, 03:13 PM

Quote:

Originally Posted by mav1178

better to just buy this motor:

https://www.facebook.com/hhatada/posts/1956904927668033

Dry sump would be sweet.

Teseo · 12-29-2017, 03:26 PM

More revs mean more wear, right?

fang_gt86 · 12-29-2017, 03:52 PM

Quote:

Originally Posted by Teseo

More revs mean more wear, right?

Yes. Unless unless everything's coated with unobtainium.

Captain Snooze · 12-29-2017, 04:11 PM

Quote:

Originally Posted by mav1178

better to just buy this motor:

https://www.facebook.com/hhatada/posts/1956904927668033

Or this:
https://www.synergypower.co.nz/

Ultramaroon · 12-29-2017, 04:34 PM

Quote:

Originally Posted by Captain Snooze

Or this:
https://www.synergypower.co.nz/

Capt Spaulding · 12-29-2017, 04:47 PM

If you want to spin a motor to 12-13K buy a vehicle with a motor that spins 12-13K - A ZX Kowalski, an R1, or a CBR-RR Honda would be a place to start. You'll probably shoot your eye out, but it will probably hurt less than trying to spin an FA into five figure territory.

Captain Snooze · 12-29-2017, 04:59 PM

But a slightly more serious question is why? I mean 12k rpm is all well and good but from the little I have seen of modified Subaru engines big power is available at "normal" rpms. What benefit does high rpm bring?

Detroiter · 12-29-2017, 05:04 PM

Not 12K rpms but this is probably the closest you'll get with an FA20 http://elementtuning.com/competition...r-wrx-fa20dit/

If I had the funds for a no expense spared build I'd be buying one of their turbo blocks with the big valve heads right now. Honestly seems like not bad of a deal for the upgrades done. They are not you're typical "built" motor.

Detroiter · 12-29-2017, 05:08 PM

Quote:

Originally Posted by Captain Snooze

But a slightly more serious question is why? I mean 12k rpm is all well and good but from the little I have seen of modified Subaru engines big power is available at "normal" rpms. What benefit does high rpm bring?

I feel the same way about it to an extent. For the average build a motor that will make plenty of power at the standard rpm range.

Where the high rpm's give you benefit is where you can extend the power band of the BIG turbos out there. It's one of the many reasons you can see Evos running well over 1000whp from a 4 cylinder. They have built the engines to see excessive rpm's allowing for a turbo that will flow that much air to spool.

[ame="https://www.youtube.com/watch?v=iIRVrQ5cRks"]Mitsubishi Evo - Almost 2000hp 12k rpm - YouTube[/ame]

12-29-2017, 12:37 PM	#1
Irace86.2.0 Senior Member Join Date: Mar 2017 Drives: Q5 + BRZ + M796 Location: Santa Rosa, CA Posts: 7,883 Thanks: 5,668 Thanked 5,804 Times in 3,299 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	Who would want 12,000rpms to play with? The 42psi turbo would be sweet, but 12,000rpms would be sweeter. [ame="https://www.youtube.com/watch?v=1UwI-Rtuc38"]The 12,000rpm Subaru called Betty ðŸ˜² \| Built by GotitRex - YouTube[/ame] So destroking the engine...this would be removing stroke, so the piston doesn't travel as far. This reduces piston acceleration for a given rpm meaning there becomes a potential higher rev limit for the block. To do this one would need to build a custom set of light-weight, rods and a custom crank shaft, right, then build the head? The head would need some stiffer and lighter weight components like titanium springs, right? Would compression need to change? What needs to be changed for the transmission to handle the rpms?

12-29-2017, 04:47 PM	#11
Capt Spaulding Persona Non Grata Join Date: Nov 2015 Drives: '15 BRZ (WRB) Location: On the Border Posts: 1,882 Thanks: 2,016 Thanked 2,780 Times in 1,200 Posts Mentioned: 10 Post(s) Tagged: 1 Thread(s)	If you want to spin a motor to 12-13K buy a vehicle with a motor that spins 12-13K - A ZX Kowalski, an R1, or a CBR-RR Honda would be a place to start. You'll probably shoot your eye out, but it will probably hurt less than trying to spin an FA into five figure territory. __________________ Slow is smooth, and smooth is fast

12-29-2017, 04:59 PM	#12
Captain Snooze Because compromise ® Join Date: Jan 2012 Drives: Red Herring Location: australia Posts: 7,720 Thanks: 3,992 Thanked 9,339 Times in 4,125 Posts Mentioned: 60 Post(s) Tagged: 0 Thread(s)	But a slightly more serious question is why? I mean 12k rpm is all well and good but from the little I have seen of modified Subaru engines big power is available at "normal" rpms. What benefit does high rpm bring? __________________ My car is completely stock except for all the mods.

12-29-2017, 05:04 PM	#13
Detroiter Senior Member Join Date: Feb 2017 Drives: 2014 Scion FR-S Monogram Location: Michigan Posts: 215 Thanks: 149 Thanked 126 Times in 83 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Not 12K rpms but this is probably the closest you'll get with an FA20 http://elementtuning.com/competition...r-wrx-fa20dit/ If I had the funds for a no expense spared build I'd be buying one of their turbo blocks with the big valve heads right now. Honestly seems like not bad of a deal for the upgrades done. They are not you're typical "built" motor. __________________ 2014 Scion FR-S Monogram Raven OFT Stage 2 UEL E85 \| Tomei UEL Headers \| Catless FP \| Greddy Revolution RS Catback \| HKS Air Filter \| Toyota Badge Swap

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12-29-2017, 02:01 PM	#2
-Willis-86touge Senior Member Join Date: Mar 2016 Drives: Stock Location: Arkansas Posts: 206 Thanks: 52 Thanked 48 Times in 33 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Fuel pump can only handle 8200 Rpms so was of time unless you change this too.

12-29-2017, 02:18 PM	#3
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	If you are speaking about FA20 engine in ours, you'll hit oiling problems way way before 12K rpm. In fact, you probably won't reach even 9000, at least if you care for engine to outlast one race, with 8200 being more probable upper limit.

12-29-2017, 02:25 PM	#5
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,093 Times in 3,029 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	better to just buy this motor: https://www.facebook.com/hhatada/posts/1956904927668033

12-29-2017, 03:26 PM	#7
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,877 Thanks: 7,143 Thanked 2,922 Times in 1,769 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	More revs mean more wear, right?

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