which pistons should i buy??? - Toyota Nation Forum : Toyota Car and Truck Forums

project92camry · 12-16-2010, 12:38 AM

92 camry 5sfe and going to boost it in a few months.
should i get a 8.5:1 or 9.0:1 forged piston?
im leaning towards the 8.5. what you guys think?

***MR2Jedi*** · 12-16-2010, 12:54 AM

9.0:1,
A litttle bit more power while still staying in a safe compression range for boosting.
I'm running 9,0:1 and 18 psi on 93 octane. No problem. Awsome pull.

***N/A Camry Sleeper*** · 12-16-2010, 08:41 PM

Really depends on how much boost you will be using - but I agree with MR2Jedi - 9:1 is a pretty good ratio. If you were really ambitious and wanted something a little more aggressive you could get 10.5:1 or even 11:1 and run low <8PSI or so, but water/meth injection is almost required with this plus proper safe tuning, however if you were to suddenly lose power to the fuel pump or water/meth injectors...well, time to start over!

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...would like to take some ideas from people using FI for my N/A build, and will be posting my *SLOW* progess as time goes on!

***MR2Jedi*** · 12-16-2010, 09:16 PM

Anything above 9.0:1 is risky. And like stated above, you will have to keep the boost low and take extra steps for charge cooling.
With my set up at 9.0:1, I would not go more than 19psi, And thats if I could find 95 octane. The highest I've found locally is 93, so I keep it at 18psi.
Available fuel in your area should also play in your decision.

SirThomas88 · 12-16-2010, 10:47 PM

Quote:

Originally Posted by MR2Jedi

Anything above 9.0:1 is risky. And like stated above, you will have to keep the boost low and take extra steps for charge cooling.
With my set up at 9.0:1, I would not go more than 19psi, And thats if I could find 95 octane. The highest I've found locally is 93, so I keep it at 18psi.
Available fuel in your area should also play in your decision.

Are we talking about forged pistons?

***MR2Jedi*** · 12-16-2010, 10:49 PM

yes

project92camry · 12-18-2010, 12:04 AM

thanx for the input guys. im only planning for 10psi for now and then going 15psi when i do a 3sgte head swap in the future.

***MR2Jedi*** · 12-18-2010, 12:38 AM

Quote:

Originally Posted by project92camry

thanx for the input guys. im only planning for 10psi for now and then going 15psi when i do a 3sgte head swap in the future.

Ah, 5sfte stroker! That can be a beast.!

With a FMIC, you'll be good at 10psi.
I would recommend the ATS Racing 170 degree thermostat. A cheap mod to help keep temps down- especially since the 5s head doesn't have coolant jackets.

RichieRichJP · 12-18-2010, 02:34 AM

In case you don't know, there's a difference between the pistons using either 5S or 3S head.

***MR2Jedi*** · 12-18-2010, 02:38 AM

If you're talking to me, yes, I know. There's more to the stroker than just the 3sgte head.
5s crank must be machined to accept 3s rods, etc.

RichieRichJP · 12-18-2010, 02:39 AM

I meant to project camry up there^
I don't think he knows the work involved.

***MR2Jedi*** · 12-18-2010, 02:44 AM

Possibly. I would suggest he does some reading on the build in the MR2 section or at MR2.OC

project92camry · 12-18-2010, 08:05 AM

ahh man really? wats the difference in the pistons? . cause im goin to build the bottom end for now then do the head like in the summer.

***LynchburgCSI*** · 12-18-2010, 09:55 AM

Quote:

Originally Posted by MR2Jedi

Possibly. I would suggest he does some reading on the build in the MR2 section or at MR2.OC

^ This.

***Mister_Perkins*** · 12-18-2010, 10:17 AM

that head swap is major $$$