Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - Components to upgrade for forced induction

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Components to upgrade for forced induction

I have heard that pistons and connecting rods are the weak point. Would like to know some qualified opinions. Also, are there any forged/race spec replacements under development? This gives a better idea of the cost of a forced induction system.

I'd assume it would depend on how much boost you want. If you're only pushing 6-8psi, your fortifications may not need to be quite so hefty.

Pistons will be necessary to lower the compression and rods will be necessary to hold the torque.

Quote:

Originally Posted by Crawford Performance (Post 440257)

Pistons will be necessary to lower the compression and rods will be necessary to hold the torque.

how much would they cost around? rough estimate.

I would say you shouldn't need anything for <301whp

Quote:

Originally Posted by jellygorilla (Post 440270)

how much would they cost around? rough estimate.

$1500 / $1800 is a guesstimate...

I wonder if we can get our hands on the JDM Subaru Legacy pistons/rods, which uses I believe a turbocharged FA20.

I guess the answer to your question is dependent on how much horsepower are you planning to push out. I say always go for reliable power meaning if you plan on having 400hp, build your engine to handle 600hp for reliability and safety - that's just me though.

-Frank

Quote:

Originally Posted by mact (Post 440563)

I wonder if we can get our hands on the JDM Subaru Legacy pistons/rods, which uses I believe a turbocharged FA20.

But with different DI injectors and most likely different piston crowns... boo

Hopefully the rods will work and be an upgrade but so far the bottom ends seems plenty strong.

well, aparently, if your looking anywhere in the range of having 450+whp you should be safe at 20psi. As long as you don't constantly bounce off the rev limiter...

Have you even looked at the F/I kits?? Take for instance the AP kit, they have been pushing over 400whp with no problems aside from the stock clutch and now the clutchfork.

Seems like its not the engine internals you should worry about... its more the rest of the driveline... Just sayn.

The motor seems pretty stout but rods and pistons will be needed. A new tranny + drivetrain will needed eventually(clutch before tranny) The rear end will probably break after 400whp and hard launches on DR's. its too soon to tell the true limit on all parts of this car, but its inevitable that if you are gonna push the power potential of this motor and want to race it you will need a built bottom end, built drivetrain and built rear end.

Well, as ive said, Don has been pushing over 400rwhp for quite a while now and not had one problem with the motor or daily driving it with that much WHP. He just does real-world things with it such as things that "we" would do with it. A few drag races here and there, drag strip runs, and hwy pulls. But, there is no telling till it happens, as far as the rods, pistons, and the block goes. Just be patient.

Quote:

Originally Posted by wbradley (Post 440081)

I have heard that pistons and connecting rods are the weak point. Would like to know some qualified opinions.
Also, are there any forged/race spec replacements under development? This gives a better idea of the cost of a forced induction system.

To the OP. I agree with Modbargins, and below is your answer.

Quote:

Originally Posted by ModBargains (Post 452654)

I guess the answer to your question is dependent on how much horsepower are you planning to push out.
I say always go for reliable power meaning if you plan on having 400hp, build your engine to handle 600hp for reliability and safety -
that's just me though.

-Frank

Quote:

Originally Posted by mact (Post 440563)

I wonder if we can get our hands on the JDM Subaru Legacy pistons/rods, which uses I believe a turbocharged FA20.

Wiseco - Accelerated Performance Turbo Forged Piston Set
http://www.ft86club.com/forums/showthread.php?t=12956

Quote:

Originally Posted by Don@Accelerated (Post 342574)

Accelerated Performance is proud to announce another new product for the FA20 Engine.
I supplied Wiseco with the parts required some while ago to make piston sets for the FA20 Engine.
This particular piston drawing will be the turbo variation of an off the shelf Wiseco Piston and something in the 10-10.5:1 Variety.

There will be off the shelf versions and custom AP Spec Versions of the pistons.
The AP versions will use advancements we have learned from our on and off road racing programs.

We are looking to create something very similar in strength to our Toyota 2jz pistons sets.
I would suspect that each piston will be strong enough to supply 300hp per cylinder.
Obviously thats far more than this engine will be able to hold for a long time if ever.

Don

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