Best pistons to use and Comp ratio? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Tansey86 · 02-04-2014, 05:10 PM

The highest you can go given you have the octane to support it the better. The higher the compression the more responsive and efficient. I would choose high compression and low boost, over low compression and high boost on a street car.

BRZPDX · 02-04-2014, 05:31 PM

so what is the most ideal situation?

High CR engine + low boost
Low CR engine + high boost

Ironsquid · 02-04-2014, 05:46 PM

Quote:

Originally Posted by BRZPDX

so what is the most ideal situation?

High CR engine + low boost
Low CR engine + high boost

Preference. Depends on where you want your power band and how smooth you want/need the power.

Fabron757 · 02-04-2014, 06:11 PM

I wanted to play with 10:1 to 10:5 , but whats a good piston to go with?

diss7 · 02-04-2014, 06:19 PM

High CR, High boost, small turbo, as long as turbo can get there and still be efficient.

Going to be 9000x more fun to drive, compared to low CR, big turbo, any boost level.

Unless all you do is drag racing / highway pulls.

My 2c.

cdrazic93 · 02-04-2014, 07:42 PM

Quote:

Originally Posted by BRZPDX

so what is the most ideal situation?

High CR engine + low boost
Low CR engine + high boost

http://www.xcceleration.com/cr-boost%20101.htm

This answers exactly that question

FreshFRS · 02-04-2014, 08:46 PM

Quote:

Originally Posted by Fabron757

I wanted to play with 10:1 to 10:5 , but whats a good piston to go with?

Wiseco, Mahle, CP, JE pretty much any of them are a good choice, just have to see who has specific fitments.

Fabron757 · 02-04-2014, 10:37 PM

I think full blown uses Arias pistons. Are those good?

BRZPDX · 02-04-2014, 10:43 PM

Quote:

Originally Posted by cdrazic93

http://www.xcceleration.com/cr-boost%20101.htm

This answers exactly that question

this page is truly awesome. Thanks dude

cdrazic93 · 02-04-2014, 10:51 PM

Quote:

Originally Posted by BRZPDX

this page is truly awesome. Thanks dude

Found it because I was curious about the same thing.

cdrazic93 · 02-04-2014, 10:55 PM

Quote:

Originally Posted by Fabron757

I think full blown uses Arias pistons. Are those good?

Haven't heard much about Arias pistons, but from what @FullBlown uses, it's quality stuff.

Jesse@JDLAutodesign · 02-04-2014, 11:04 PM

I've used Arias in a few of my honda builds awhile back...never any issues making 700+whp.

FullBlown · 02-04-2014, 11:27 PM

We have been using Arias Pistons in many different platforms for a long time. The guys over there are top notch and know how to build a hell of a piston.

Most of their stuff is custom tailored to what you need. We tell them how much boost, and power we expect to make and they design the piston around our needs.

The pistons we get are not " off the shelf " piston.

D K · 02-05-2014, 01:06 PM

Everything changes when you add direct injection.
It allows much more scr and boost than port injection alone.
Lot of guys disable di, but keeping will allow for much better fueling control. Specially ad mid rpm / peak torque area.

These engines have nothing to do with the EJ and what worked there doesnt mean its the way to go here.

The new WRX has 10.6:1 and its di only and turbo from factory, so I dont see any reason to go lower.

IMHO of course

David

02-04-2014, 05:10 PM	#15
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)	The highest you can go given you have the octane to support it the better. The higher the compression the more responsive and efficient. I would choose high compression and low boost, over low compression and high boost on a street car. __________________ " I know a lot about cars, man. I can look at any car's headlights and tell you exactly which way it's coming. "

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02-04-2014, 06:11 PM	#18
Fabron757 Senior Member Join Date: Mar 2013 Drives: 2013 blue frs m6 BW EFR 7064 Turbo Location: Hampton VA Posts: 170 Thanks: 2 Thanked 45 Times in 31 Posts Mentioned: 2 Post(s)	I wanted to play with 10:1 to 10:5 , but whats a good piston to go with?

02-04-2014, 06:19 PM	#19
diss7 Banned Join Date: Sep 2012 Drives: AE86, 2x GT86, TE27 Location: Christchurch NZ Posts: 1,478 Thanks: 826 Thanked 1,181 Times in 522 Posts Mentioned: 33 Post(s)	High CR, High boost, small turbo, as long as turbo can get there and still be efficient. Going to be 9000x more fun to drive, compared to low CR, big turbo, any boost level. Unless all you do is drag racing / highway pulls. My 2c.

02-04-2014, 10:37 PM	#22
Fabron757 Senior Member Join Date: Mar 2013 Drives: 2013 blue frs m6 BW EFR 7064 Turbo Location: Hampton VA Posts: 170 Thanks: 2 Thanked 45 Times in 31 Posts Mentioned: 2 Post(s)	I think full blown uses Arias pistons. Are those good?

02-04-2014, 11:04 PM	#26
Jesse@JDLAutodesign Join Date: Aug 2012 Drives: 2013 Raven Black FRS Location: Phx AZ Posts: 601 Thanks: 56 Thanked 680 Times in 258 Posts Mentioned: 22 Post(s)	I've used Arias in a few of my honda builds awhile back...never any issues making 700+whp.

02-04-2014, 11:27 PM	#27
FullBlown Senior Member Join Date: Sep 2012 Drives: Scion FRS Location: MN Posts: 1,171 Thanks: 242 Thanked 2,026 Times in 548 Posts Mentioned: 298 Post(s)	We have been using Arias Pistons in many different platforms for a long time. The guys over there are top notch and know how to build a hell of a piston. Most of their stuff is custom tailored to what you need. We tell them how much boost, and power we expect to make and they design the piston around our needs. The pistons we get are not " off the shelf " piston.

02-05-2014, 01:06 PM	#28
D K Stig's dark passenger Join Date: Dec 2013 Drives: FR-S Location: I work abroad Posts: 724 Thanks: 60 Thanked 316 Times in 186 Posts Mentioned: 20 Post(s)	Everything changes when you add direct injection. It allows much more scr and boost than port injection alone. Lot of guys disable di, but keeping will allow for much better fueling control. Specially ad mid rpm / peak torque area. These engines have nothing to do with the EJ and what worked there doesnt mean its the way to go here. The new WRX has 10.6:1 and its di only and turbo from factory, so I dont see any reason to go lower. IMHO of course David

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