how much psi can the stock motor hold? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

xUhMeyziing · 06-14-2014, 01:44 PM

does anyone know how much psi the stock motor can handle? im at 340whp at 11psi on e85 and im wanting to boost 20psi but im not sure if its a good idea or not

ntron1 · 06-14-2014, 03:07 PM

When you find the limit, let us know.

amilleri · 06-14-2014, 04:54 PM

I've seen a lot of engine failures around 20k miles with boost, I wouldn't suggest putting much if any at all. There's a thread with a list of them.

OICU812 · 06-14-2014, 05:11 PM

Quote:

Originally Posted by amilleri

I've seen a lot of engine failures around 20k miles with boost, I wouldn't suggest putting much if any at all. There's a thread with a list of them.

All of which were reported with either bad tunes, improper supporting mods or just waaaay to high of boost. On pump gas 10-11psi seems to be the "safe" limit (with) a good tune. E85 14-16psi (with) a good tune and of course supporting mods in place day one.

Folks who have a good tune stay within respectable levels seem to be having zero issues. WHP wise under 300 particularity seems to work just fine with stock internals

AVodka14 · 06-14-2014, 05:14 PM

Quote:

Originally Posted by xUhMeyziing

does anyone know how much psi the stock motor can handle? im at 340whp at 11psi on e85 and im wanting to boost 20psi but im not sure if its a good idea or not

You're out of your mind if you think this motor can hold 20 psi without support. I am starting to question this motor's reliability based on people's experiences on here. I have read the engine is very stout yet no objective data on this after seeing people with issues without boost. This motor was not intended to be boosted in my opinion. But if you do it right you can bump it up. Forged rods, pistons, HD clutch, etc.

There are plenty of people on here with variable experiences that can provide better input than me.

charged86 · 06-14-2014, 05:18 PM

about 40psi

Black Tire · 06-14-2014, 05:23 PM

Interesting question! I know very little about this, but I think I can safely say, it depends on how long you want your motor to last.

Reaper · 06-14-2014, 05:43 PM

Fullblown made 600whp on stock motor. Im at 380wtq and 450 whp at 9,000miles. Theres a guy near atlanta at 579whp and a guy in alphareta with 529whp. I know of them through facebook groups i think its dipstik sportec and sportsguy83 but im probably confusing real people with ft86 usernames. Lexusb was over 500whp as well and i think he was at 24,000 last time he posted. Oh and this motor was built specifically to be boosted, hence the fa20dit only having slightly lower compression and around 300hp. So if the factory build one at 300 im sure 350 isnt pushing it too much on pump gas with a little bit more compression but with a better turbo and tune. Im not scared of 400whp on e85 at all.

Jyn · 06-14-2014, 06:50 PM

PSI is not as good a measure. CFM is what you're looking for.

Celadrielas · 06-14-2014, 06:55 PM

I'm not boosted, but I know we have a few turbo / Supercharged running around my local meetup chapter. We have most pushing 320-350whp, I believe (uncertain of tq) but I know we have at least one at 400whp running E85.

He's run into some other issues though along the way. like the tail wants to step out under full throttle in a straight line. That and traction control just gives up. almost like it says "Too much power, fuck off -- I quit"

I'm personally going to be going N/A and aiming for around 230-250 and hoping for tq around 190-230. -- reason I want N/A is because I won't ever use 4-5-600 hp. But I will always use ~250. (personal pref I guess, though I have been considering a lower output SC build out just for the fun & simplicity of it)

ZOMFGAARON · 06-14-2014, 07:15 PM

21psi is the highest I think I've seen. I'm sure there's higher out there.
http://www.ft86club.com/forums/showthread.php?t=59784

Sent from my iPhone using Tapatalk

AVodka14 · 06-14-2014, 07:55 PM

Quote:

Originally Posted by Reaper

Oh and this motor was built specifically to be boosted, hence the fa20dit only having slightly lower compression and around 300hp. So if the factory build one at 300 im sure 350 isnt pushing it too much on pump gas with a little bit more compression but with a better turbo and tune. Im not scared of 400whp on e85 at all.

Purely curious. You really think the motor for our platform was built to handle boost? I know the DIT is the same motor for the most part. And that Tada wanted the purchaser to do what they pleased with the car. Just wasn't sure boost was part of his equation or not. Curious for more details from you. Thanks.

kiichiro · 06-14-2014, 07:58 PM

I'm on 13 now

jflogerzi · 06-14-2014, 08:00 PM

Quote:

Originally Posted by Celadrielas

I'm not boosted, but I know we have a few turbo / Supercharged running around my local meetup chapter. We have most pushing 320-350whp, I believe (uncertain of tq) but I know we have at least one at 400whp running E85.

He's run into some other issues though along the way. like the tail wants to step out under full throttle in a straight line. That and traction control just gives up. almost like it says "Too much power, fuck off -- I quit"

I'm personally going to be going N/A and aiming for around 230-250 and hoping for tq around 190-230. -- reason I want N/A is because I won't ever use 4-5-600 hp. But I will always use ~250. (personal pref I guess, though I have been considering a lower output SC build out just for the fun & simplicity of it)

Its never gonna happen you can keep dreaming with those numbers and staying NA

06-14-2014, 03:07 PM	#2
ntron1 Sarcastic Bastard Join Date: Apr 2013 Drives: '13 DGM BRZ, '13 Mini, 1999 Blazer Location: Amish Land, PA Posts: 586 Thanks: 341 Thanked 336 Times in 182 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	When you find the limit, let us know. __________________

06-14-2014, 05:18 PM	#6
charged86 Senior Member Join Date: Mar 2013 Drives: whiteout gt86 2015 IS350fsport Location: northern kentucky. cincy Posts: 1,931 Thanks: 2,154 Thanked 697 Times in 437 Posts Mentioned: 42 Post(s) Tagged: 0 Thread(s)	about 40psi __________________ INSTAGRAM @Rcf_700 www.youtube.com/boostindub

06-14-2014, 05:43 PM	#8
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	Fullblown made 600whp on stock motor. Im at 380wtq and 450 whp at 9,000miles. Theres a guy near atlanta at 579whp and a guy in alphareta with 529whp. I know of them through facebook groups i think its dipstik sportec and sportsguy83 but im probably confusing real people with ft86 usernames. Lexusb was over 500whp as well and i think he was at 24,000 last time he posted. Oh and this motor was built specifically to be boosted, hence the fa20dit only having slightly lower compression and around 300hp. So if the factory build one at 300 im sure 350 isnt pushing it too much on pump gas with a little bit more compression but with a better turbo and tune. Im not scared of 400whp on e85 at all. __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

06-14-2014, 06:50 PM	#9
Jyn Noob Join Date: Jan 2014 Drives: FR-S Mammogram Location: Austin Posts: 1,585 Thanks: 574 Thanked 870 Times in 479 Posts Mentioned: 24 Post(s) Tagged: 2 Thread(s)	PSI is not as good a measure. CFM is what you're looking for. __________________ :@ChaoyD

06-14-2014, 07:58 PM	#13
kiichiro corolla specs/GTR looks Join Date: May 2013 Drives: ooh oooh pretty tail lights Location: slower than a accord V6 Posts: 490 Thanks: 229 Thanked 113 Times in 79 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	I'm on 13 now __________________ SOLD THEM BOTH Hers: 2007 987S Mine: 2012 991S That was fun, thanks Hachi

06-14-2014, 04:54 PM	#3
amilleri Senior Member Join Date: Dec 2011 Drives: 2010 Scion xD Location: Waterbury, CT Posts: 109 Thanks: 5 Thanked 44 Times in 17 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I've seen a lot of engine failures around 20k miles with boost, I wouldn't suggest putting much if any at all. There's a thread with a list of them.

06-14-2014, 06:55 PM	#10
Celadrielas Senior Member Join Date: Mar 2014 Drives: 2013 Asphalt Fr-S Location: Earth Posts: 850 Thanks: 535 Thanked 378 Times in 248 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	I'm not boosted, but I know we have a few turbo / Supercharged running around my local meetup chapter. We have most pushing 320-350whp, I believe (uncertain of tq) but I know we have at least one at 400whp running E85. He's run into some other issues though along the way. like the tail wants to step out under full throttle in a straight line. That and traction control just gives up. almost like it says "Too much power, fuck off -- I quit" I'm personally going to be going N/A and aiming for around 230-250 and hoping for tq around 190-230. -- reason I want N/A is because I won't ever use 4-5-600 hp. But I will always use ~250. (personal pref I guess, though I have been considering a lower output SC build out just for the fun & simplicity of it)

06-14-2014, 07:15 PM	#11
ZOMFGAARON A Demon Join Date: Dec 2013 Drives: Raven GT86 Location: Denver Posts: 1,992 Thanks: 190 Thanked 1,321 Times in 701 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	21psi is the highest I think I've seen. I'm sure there's higher out there. http://www.ft86club.com/forums/showthread.php?t=59784 Sent from my iPhone using Tapatalk

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