what fails first - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

CBR600RR · 10-11-2012, 11:24 AM

Don Accellerated blew something in his tranny after he smoked two clutches,

kmbkk · 10-11-2012, 12:20 PM

Yeah, but that was because he caught air...

CBR600RR · 10-11-2012, 12:30 PM

^correct so not necessarily because of the 400hp+

finch1750 · 10-11-2012, 12:54 PM

you're gonna have to tear apart the block to replace the piston rings you fried. Ringland issues have been prominent in Subaru's. Usually #4.

cobrabyte · 10-11-2012, 01:06 PM

Quote:

Originally Posted by finch1750

you're gonna have to tear apart the block to replace the piston rings you fried. Ringland issues have been prominent in Subaru's. Usually #4.

If I recall correctly, the ringlands in this engine are a wee bit beefier. But my money's on the rods/ringlands.

drifter · 10-11-2012, 01:15 PM

Quote:

Originally Posted by VSGTS14

the piston rings. a factory subaru rod is pretty damn strong, for them to fail is very rare.
it's always the piston rings....or the heads will lift, since the motor wasn't designed for the boost.

but what do we know, subaru may have built this thing strong as hell knowing that they failed with the sti's stock block on later models and knowing the aftermarket world was going to turbo the poop out of the car.

Not having any experience with this.. would it be fair to say there would be much less chance of this happening to a ...say...AVO stage 1 turbo which would minimize booste to about 50 or 70 hp? (I believe that was at 5 psi)
thanks.

Tansey86 · 10-11-2012, 01:17 PM

Whatever breaks, were gonna need the mad scientist to rip it apart and rebuild it.

cobrabyte · 10-11-2012, 01:37 PM

Crawford's bandsaw'd piston:

http://www.facebook.com/BRZClub/posts/407849379278427

Looks considerably more beefy than the EJ pistons.

dsmx17 · 10-11-2012, 03:02 PM

Headgaskets? seems to be the most likely failure point (as designed to be)

finch1750 · 10-11-2012, 05:11 PM

Quote:

Originally Posted by cobrabyte

If I recall correctly, the ringlands in this engine are a wee bit beefier. But my money's on the rods/ringlands.

Idk why I keep clicking thanks instead of quote today. Lol

Anyway, could be true. Though Subaru rods are usually pretty solid. Either way I think Full Blown will be the ones to give us the answer in due time. 500+ HP. Damn....

VSGTS14 · 10-11-2012, 05:49 PM

Quote:

Originally Posted by drifter

Not having any experience with this.. would it be fair to say there would be much less chance of this happening to a ...say...AVO stage 1 turbo which would minimize booste to about 50 or 70 hp? (I believe that was at 5 psi)
thanks.

as soon as you add a turbo kit, you're putting that motor under new stress and your pistons rings are sure to blow way faster than a factory motor.

but we haven't seen anything blow yet.

xwd · 10-11-2012, 07:27 PM

I believe on NASIOC Crawford mentioned the ring lands were almost twice the diameter of the EJ257 ones.

The key to all of that is tuning and staying away from detonation, it's what kills EJ257 ring lands, not necessarily boost pressure. All this high HP builds are making power on E85, it will be interesting to see how much reliable power folks get on 91/93 and how long the motors last.

I'm going to say rods or bearings, maybe head gasket. I'm hoping not rods because that can cause fairly catastrophic damage depending on what happens.

Cyrious G · 10-13-2012, 07:27 PM

Im interested to see if the trans will hold up to any more than 400whp.

TheRipler · 10-13-2012, 07:33 PM

I'm going to say head studs will stretch somewhere approaching 500wtq, lifting the heads, and blowing the gaskets.

10-11-2012, 12:54 PM	#18
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,593 Thanks: 9,403 Thanked 9,411 Times in 5,270 Posts Mentioned: 374 Post(s) Tagged: 33 Thread(s)	you're gonna have to tear apart the block to replace the piston rings you fried. Ringland issues have been prominent in Subaru's. Usually #4. __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

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10-11-2012, 11:24 AM	#15
CBR600RR Senior Member Join Date: Jul 2012 Drives: Raven Black Location: Ottawa, Canada Posts: 1,343 Thanks: 451 Thanked 563 Times in 276 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Don Accellerated blew something in his tranny after he smoked two clutches,

10-11-2012, 12:20 PM	#16
kmbkk First 86 Driver Baby! Join Date: Jan 2012 Drives: FR-S, Flex Location: Williamsburg, VA Posts: 1,760 Thanks: 520 Thanked 525 Times in 356 Posts Mentioned: 32 Post(s) Tagged: 3 Thread(s)	Yeah, but that was because he caught air...

10-11-2012, 12:30 PM	#17
CBR600RR Senior Member Join Date: Jul 2012 Drives: Raven Black Location: Ottawa, Canada Posts: 1,343 Thanks: 451 Thanked 563 Times in 276 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	^correct so not necessarily because of the 400hp+

10-11-2012, 01:17 PM	#21
Tansey86 Senior Member Join Date: Sep 2012 Drives: 2003 Subaru Outback Location: Long Island, NY Posts: 1,318 Thanks: 154 Thanked 529 Times in 300 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Whatever breaks, were gonna need the mad scientist to rip it apart and rebuild it.

10-11-2012, 03:02 PM	#23
dsmx17 4g63>rotards Join Date: Sep 2012 Drives: 98'GSX 11'Tundra 10'Wrangler Location: VA Posts: 162 Thanks: 60 Thanked 82 Times in 43 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Headgaskets? seems to be the most likely failure point (as designed to be)

10-11-2012, 07:27 PM	#26
xwd Senior Member Join Date: Feb 2012 Drives: 2013 DGM Subaru BRZ (Subie #9) Location: ATL, US Posts: 2,667 Thanks: 123 Thanked 861 Times in 552 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	I believe on NASIOC Crawford mentioned the ring lands were almost twice the diameter of the EJ257 ones. The key to all of that is tuning and staying away from detonation, it's what kills EJ257 ring lands, not necessarily boost pressure. All this high HP builds are making power on E85, it will be interesting to see how much reliable power folks get on 91/93 and how long the motors last. I'm going to say rods or bearings, maybe head gasket. I'm hoping not rods because that can cause fairly catastrophic damage depending on what happens.

10-13-2012, 07:27 PM	#27
Cyrious G Pro Tire Killer Join Date: Oct 2012 Drives: 2013 Scion FRS Location: Mississauga Posts: 9 Thanks: 0 Thanked 18 Times in 4 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Im interested to see if the trans will hold up to any more than 400whp.

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