450 Whp possible with 12.5:1 compression - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Garvin29 · 03-03-2022, 09:52 PM

I see, it seems that the most reliable and least complicated thing will be to buy the CP 10.5:1 pistons and not complicate my life, thanks anyway, I know that many easily reach that goal with E85. and for the guys above it will not be a stock block the question is for me to decide which piston was more suitable for my goal, I already have a lot of accessories to help keep everything good, oil cooler, a configuration of oil cans that have lowered the pressure in the crankcase, oil deflectors, oil pickup, ect. The last thing I need is to build the engine.

Poogchomp · 03-03-2022, 10:33 PM

You could get an IAG short block instead of building it. They also machine it to help the oiling issues.

Irace86.2.0 · 03-04-2022, 01:24 AM

Quote:

Originally Posted by Garvin29

I see, it seems that the most reliable and least complicated thing will be to buy the CP 10.5:1 pistons and not complicate my life, thanks anyway, I know that many easily reach that goal with E85. and for the guys above it will not be a stock block the question is for me to decide which piston was more suitable for my goal, I already have a lot of accessories to help keep everything good, oil cooler, a configuration of oil cans that have lowered the pressure in the crankcase, oil deflectors, oil pickup, ect. The last thing I need is to build the engine.

I think the FA20F in the WRX is 10.6:1. People seem to be knock limited on the stock block sub 325whp with pump gas. I don't know if aftermarket rods and pistons can take a beating surviving 400whp with knock or worse. Direct injection helps, but lower compression ratio is a good idea. I don't know how much direct injection improves knock resistance. Older EVOs and STIs were maxing out pump gas around 400-425whp and that was with a 8-9:1 compression ratio.

86TOYO2k17 · 03-04-2022, 06:08 PM

Doesn’t seem like stock block lasts long over the 3-350whp range regardless of octane.

But is there even any documentation of anyone even hitting 400whp on pump regardless of built block or lower compression or not?

p1l0t · 03-04-2022, 06:12 PM

The other thread claimed 693hp was the record on the stock block (probably not pump gas though). I'm sure that isn't a daily driver, lol.

Sent from my SM-G975U using Tapatalk

86TOYO2k17 · 03-04-2022, 06:38 PM

Quote:

Originally Posted by p1l0t

The other thread claimed 693hp was the record on the stock block (probably not pump gas though). I'm sure that isn't a daily driver, lol.

Sent from my SM-G975U using Tapatalk

Yeah not on pump gas. And making 693whp once on a dyno to never go over 10% throttle again and never actually use the power isn’t really the same thing.

300-320whp w/ sc or 330-350whp w/ turbo even on Ethanol seems the top end of reliable on stock block if you’re actually going to use the power.

But reliability aside, I don’t think I’ve seen anyone hit 400whp+ on pump gas regardless of compression.

JOSEC · 03-05-2022, 12:32 PM

Quote:

Originally Posted by 86TOYO2k17

Doesn’t seem like stock block lasts long over the 3-350whp range regardless of octane.

But is there even any documentation of anyone even hitting 400whp on pump regardless of built block or lower compression or not?

I got it. Built Block. Head work. +1 Intake and Exhaust.
GTX2867R Gen 2. 18.5 Pounds. 420WHP On a Dynojet 93OCT.

86TOYO2k17 · 03-05-2022, 01:59 PM

Quote:

Originally Posted by JOSEC

I got it. Built Block. Head work. +1 Intake and Exhaust.
GTX2867R Gen 2. 18.5 Pounds. 420WHP On a Dynojet 93OCT.

Have a dyno? Build thread?

JOSEC · 03-05-2022, 05:22 PM

Quote:

Originally Posted by 86TOYO2k17

Have a dyno? Build thread?

No build thread. But here it is.
Name: D4ED30AA-2669-4DAD-B97C-2D852CA3E5B4.jpg
Views: 392
Size: 437.7 KB

86TOYO2k17 · 03-05-2022, 10:43 PM

Quote:

Originally Posted by JOSEC

No build thread. But here it is.
Attachment 210102

Nice power.

What was the change from red to blue?

tomm.brz · 03-06-2022, 04:27 AM

i haven t understood if that is with stock compression or lowered? i guess lowered?

JOSEC · 03-06-2022, 07:03 AM

Quote:

Originally Posted by 86TOYO2k17

Nice power.

What was the change from red to blue?

2 different Maps.
Map 1, Red Line is gate pressure at 17 PSI. 380WHP I think somewhere around 320 TQ.

Blue is Map 2, 18.5PSI More timing. 420 WHP. 347 TQ.

Both gets on boost 3-3.5K. Lots of response, very linear power.

It’s my track car, so there was more power with more aggressive timing. But wanted to keep it more conservative.

JOSEC · 03-06-2022, 07:03 AM

Quote:

Originally Posted by tomm.brz

i haven t understood if that is with stock compression or lowered? i guess lowered?

Lowered compression. 10.5:1

BrahmaBull1990 · 03-06-2022, 10:51 AM

My understanding is you start eating transmissions and axels at those levels. So you change one thing in a huge way, you need to reenforce everything else ancillary to it. I’m just puttering around at 252whp, but also research for the “one day” thoughts.

The gen 2 transmission is supposedly stronger, but I’m not sure if it is a direct bolt-up.

03-03-2022, 10:33 PM	#16
Poogchomp Member Join Date: Aug 2021 Drives: Chevrolet Ram 250 Location: Oregon Posts: 43 Thanks: 25 Thanked 33 Times in 21 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	You could get an IAG short block instead of building it. They also machine it to help the oiling issues. __________________ I got a smooth brain.

03-06-2022, 10:51 AM	#28
BrahmaBull1990 Howdy Join Date: Feb 2021 Drives: 2020 BRZ PP Location: Snohomish, WA Posts: 589 Thanks: 1,271 Thanked 446 Times in 248 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	My understanding is you start eating transmissions and axels at those levels. So you change one thing in a huge way, you need to reenforce everything else ancillary to it. I’m just puttering around at 252whp, but also research for the “one day” thoughts. The gen 2 transmission is supposedly stronger, but I’m not sure if it is a direct bolt-up. __________________ There's a point at 7,000 RPM... where everything fades. The machine becomes weightless. Just disappears. And all that's left is a body moving through space and time. 7,000 RPM. That's where you meet it. You feel it coming. It creeps up on you, close in your ear. Asks you a question. The only question that matters. Who are you?

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03-03-2022, 09:52 PM	#15
Garvin29 Member Join Date: Mar 2020 Drives: Subaru BRZ limited 2015 Location: New Jersey Posts: 20 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I see, it seems that the most reliable and least complicated thing will be to buy the CP 10.5:1 pistons and not complicate my life, thanks anyway, I know that many easily reach that goal with E85. and for the guys above it will not be a stock block the question is for me to decide which piston was more suitable for my goal, I already have a lot of accessories to help keep everything good, oil cooler, a configuration of oil cans that have lowered the pressure in the crankcase, oil deflectors, oil pickup, ect. The last thing I need is to build the engine.

03-04-2022, 06:08 PM	#18
86TOYO2k17 Senior Member Join Date: Jan 2018 Drives: 2017 toyota 86 Location: PNW Posts: 2,131 Thanks: 336 Thanked 1,188 Times in 781 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Doesn’t seem like stock block lasts long over the 3-350whp range regardless of octane. But is there even any documentation of anyone even hitting 400whp on pump regardless of built block or lower compression or not?

03-04-2022, 06:12 PM	#19
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,423 Thanks: 22,593 Thanked 9,392 Times in 4,818 Posts Mentioned: 58 Post(s) Tagged: 1 Thread(s)	The other thread claimed 693hp was the record on the stock block (probably not pump gas though). I'm sure that isn't a daily driver, lol. Sent from my SM-G975U using Tapatalk

03-06-2022, 04:27 AM	#25
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,207 Thanks: 502 Thanked 1,070 Times in 778 Posts Mentioned: 65 Post(s) Tagged: 0 Thread(s)	i haven t understood if that is with stock compression or lowered? i guess lowered?

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