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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 04-29-2014, 04:58 PM   #29
Captain Insano
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OP are you doing lighter internals or higher compression ratio? If so any ideas yet what weight and compression ratio?
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Old 04-29-2014, 07:27 PM   #30
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sub'd. Also I am looking in a N/A build mostly for scca solo Street Modified stuff. Was curious about cost obviously and whether parts were lightened(not legal in SM) but better balanced? Higher comperssion pistons, larger cams, tougher valvetrain, and usual 200whp bolt-ons running e85 and tune. I figure 250whp seems reasonable. thats my plan anyway after deployment.
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Old 04-29-2014, 07:28 PM   #31
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nice. im tuned in for more
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Old 04-29-2014, 08:44 PM   #32
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OP are you doing lighter internals or higher compression ratio? If so any ideas yet what weight and compression ratio?
Yes and Yes
A few things to figure our with the combustion chambers with a 3.5mm larger bore.

Weight unknown nothing extremely exotic in material though
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Old 04-29-2014, 08:46 PM   #33
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Are you looking into improving the rod/stroke ratio with longer rods or is it not a concern for you?
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Old 04-30-2014, 02:04 AM   #34
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So those sleeves will bore it out to 2.2ltr? 89.5mm x 86mm = approximate 2.2ltr.
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Old 04-30-2014, 08:40 AM   #35
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So those sleeves will bore it out to 2.2ltr? 89.5mm x 86mm = approximate 2.2ltr.
From Darton Sleeves page

"New Scion FRS / Subaru BRZ / Toyota 86 / Toyota GT86 MID sleeve kit now available. Comes semi-finished for stock bore size of 86mm and has a max bore size of 90mm. Sleeves can easily handle 50+ psi of boost at any bore size."
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I swear I will punch your car if you put these on. Right in the face.
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Old 04-30-2014, 03:14 PM   #36
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For an NA build bigger bore usually brings with it lower detonation threshold. Careful planning needed otherwise power gain with displacement would be lost to knock resistance.
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Old 04-30-2014, 05:04 PM   #37
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This is definitely going to be super interesting. I'm personally a fan of NA motors and hopefully this thread should be a good learning experience for me!

Subscribed!
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Old 04-30-2014, 08:26 PM   #38
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With the increased bore, HKS's stroker kit might come in handy to bring it to 90mm x 90mm and 2.3ltr. Would certainly give it some more torque!
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Old 04-30-2014, 10:05 PM   #39
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There is a small problem with a 90 mm bore.
This problem is that there is not gasket manufacture that makes a gasket larger than 89.5mm.
As for stroke I have something special planned for the crank. I will know once it is looked over. and it will be cheaper than HKS
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Old 04-30-2014, 10:07 PM   #40
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Are you looking into improving the rod/stroke ratio with longer rods or is it not a concern for you?
If I stayed with the stock stroke I could get the rod ratio somewhere around 1.58:1 instead of stock at 1.50
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Old 05-01-2014, 09:47 AM   #41
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It would be absolutely pointless for him to do an n/a build with heavier than stock components. rods and pistons are probably going to be 100-200 grams lighter than stock each. He'll have amazingly better rev limits and carry power better.
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Old 05-01-2014, 01:04 PM   #42
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Think about motorcycle engines (not harleys). They all are big bore, short stroke with individual throttle bodies. This allows for more airflow, bigger valves, and high rpms. This is what you need to make big NA power.
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