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

Garvin29 · 03-03-2022, 12:54 AM

I am putting together all the parts for my engine, but the piston decision is complicated, my goal is 400+whp, my turbo is an EFR6258 and the E85 option does not work for me. I don't have e85 nearby and I don't want to rely on e85. I just wanted to know if it's not crazy or which one do you recommend for this goal.

x808drifter · 03-03-2022, 05:41 AM

Maybe?
I've yet to see anyone actually try High Comp boost with those numbers.
Most are too afraid to try and find out, cause it it doesn't work it's wasted money or worse.

I'd say get a stroker kit to help.

tomm.brz · 03-03-2022, 07:20 AM

to me that s not possible on 93oct and stock compression, even if you install a super huge turbo to keep charge temp down and it would anyway have an extreme lag

you'd want something like 10:1 with normal fuel to reach those hp, and a big turbo

cpierr03 · 03-03-2022, 09:24 AM

Too much for pump gas imho, you'd need E85, C16, or meth injection to reduce knock.

EFR6258 is going to produce a ton of heat making 400+ whp

86TOYO2k17 · 03-03-2022, 09:42 AM

Get some meth

p1l0t · 03-03-2022, 01:00 PM

On a stock block or one of those HKS jobs?

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Garvin29 · 03-03-2022, 03:03 PM

Quote:

Originally Posted by p1l0t

On a stock block or one of those HKS jobs?

Sent from my SM-G975U using Tapatalk

it is a stock block, I was thinking that maybe with an increase in displacement it could be possible

Garvin29 · 03-03-2022, 03:05 PM

Quote:

Originally Posted by tomm.brz

to me that s not possible on 93oct and stock compression, even if you install a super huge turbo to keep charge temp down and it would anyway have an extreme lag

you'd want something like 10:1 with normal fuel to reach those hp, and a big turbo

I could actually play it safe and go down to 10.5:1 but I really like the efficiency and the lag can't be giant

Garvin29 · 03-03-2022, 03:21 PM

Quote:

Originally Posted by 86TOYO2k17

Get some meth

Now that I think about it, meth can be more easily adapted to what I'm looking for, I'll put it among the options, the problem is that with strong movements it may fail.

Garvin29 · 03-03-2022, 03:26 PM

Has anyone achieved something similar?

Grady · 03-03-2022, 03:38 PM

Possible yes, longevity no.

p1l0t · 03-03-2022, 04:15 PM

Quote:

Originally Posted by Garvin29

it is a stock block, I was thinking that maybe with an increase in displacement it could be possible

Sounds like about 400hp is the most you want to do on a stock block. (If you want to drive it more than once or twice)

According to https://www.ft86club.com/forums/showthread.php?t=38494

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CSG Mike · 03-03-2022, 04:55 PM

Possible? Yes.

How deep are your pockets?

You're gonna need race gas if you don't want to do e85.

tomm.brz · 03-03-2022, 08:29 PM

if he doesn t want to rely to e85 that he could get on the street, it seems to me useless to propose racegas.. and with 93 oct those hp and stock compression are not possible

03-03-2022, 12:54 AM	#1
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)	450 Whp possible with 12.5:1 compression I am putting together all the parts for my engine, but the piston decision is complicated, my goal is 400+whp, my turbo is an EFR6258 and the E85 option does not work for me. I don't have e85 nearby and I don't want to rely on e85. I just wanted to know if it's not crazy or which one do you recommend for this goal.

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03-03-2022, 05:41 AM	#2
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,650 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Maybe? I've yet to see anyone actually try High Comp boost with those numbers. Most are too afraid to try and find out, cause it it doesn't work it's wasted money or worse. I'd say get a stroker kit to help.

03-03-2022, 07:20 AM	#3
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,292 Thanks: 517 Thanked 1,125 Times in 815 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	to me that s not possible on 93oct and stock compression, even if you install a super huge turbo to keep charge temp down and it would anyway have an extreme lag you'd want something like 10:1 with normal fuel to reach those hp, and a big turbo

03-03-2022, 09:24 AM	#4
cpierr03 Member Join Date: Dec 2021 Drives: 2022 BRZ Location: NY Posts: 18 Thanks: 2 Thanked 17 Times in 8 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Too much for pump gas imho, you'd need E85, C16, or meth injection to reduce knock. EFR6258 is going to produce a ton of heat making 400+ whp

03-03-2022, 09:42 AM	#5
86TOYO2k17 Senior Member Join Date: Jan 2018 Drives: 2017 toyota 86 Location: PNW Posts: 2,131 Thanks: 336 Thanked 1,189 Times in 781 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Get some meth

03-03-2022, 01:00 PM	#6
p1l0t Senior Member Join Date: Jan 2016 Drives: 2016 Subaru BRZ Hyperblue Location: West Hartford, CT Posts: 8,478 Thanks: 22,741 Thanked 9,438 Times in 4,847 Posts Mentioned: 58 Post(s) Tagged: 1 Thread(s)	On a stock block or one of those HKS jobs? Sent from my SM-G975U using Tapatalk

03-03-2022, 03:26 PM	#10
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)	Has anyone achieved something similar?

03-03-2022, 04:55 PM	#13
CSG Mike Join Date: Jul 2012 Drives: S2000 CR Location: Orange County Posts: 14,564 Thanks: 8,942 Thanked 14,213 Times in 6,856 Posts Mentioned: 970 Post(s) Tagged: 14 Thread(s)	Possible? Yes. How deep are your pockets? You're gonna need race gas if you don't want to do e85.

03-03-2022, 08:29 PM	#14
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,292 Thanks: 517 Thanked 1,125 Times in 815 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	if he doesn t want to rely to e85 that he could get on the street, it seems to me useless to propose racegas.. and with 93 oct those hp and stock compression are not possible

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