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


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Old 12-28-2013, 11:40 AM   #1
Jason@DSG
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Testing The Waters

Are you guys interested in forged rods (I and H beam), forged pistons (with much lower compression -- 8.5:1, 9.0:1), aftermarket head studs?
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Old 12-28-2013, 12:07 PM   #2
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8.5:1...but why?
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Old 12-28-2013, 12:08 PM   #3
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8.5:1...but why?
Lots of boost
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Old 12-28-2013, 12:09 PM   #4
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Lots of wasted energy while needing more boost to produce the same results with higher compression pistons.
@SkAsphalt

Last edited by ciro; 12-28-2013 at 12:23 PM. Reason: picky picky people.
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Old 12-28-2013, 12:17 PM   #5
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lots of wasted energy o need for more boost when less can be added to higher compression to make more power with less lag.
Mmmm this was written poorly.
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Old 12-28-2013, 02:35 PM   #6
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Lots of boost
50psi?
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Old 12-28-2013, 02:54 PM   #7
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I run 9.0:1 on 28-30psi for 500whp

I think 9.0:1 will be the way to go. ***for big boost applications***

10.5 would be a good choice for a more conservative approach on lower - moderate boost

Last edited by Jason@DSG; 01-07-2014 at 09:39 PM.
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Old 12-28-2013, 05:56 PM   #8
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with di and e85 i don't see the need to go lower than 10:1, just means the turbo has to work harder to make the same power.
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Old 12-28-2013, 06:13 PM   #9
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ya i think 8.5:1 pistons went out with primitive tuning. anyone remember the days of stock injectors and fmu's? 10:1 with actual tuning would be perfect.

btw, will these be house brand? or something from arias, wiseco, je, etc.? IMO, these products will be very beneficial for this platform so I vote yes!
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Old 12-28-2013, 06:30 PM   #10
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Yes.

Very interested.
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Old 12-29-2013, 03:56 AM   #11
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Lots of wasted energy while needing more boost to produce the same results with higher compression pistons.
@SkAsphalt
Someone else actually gets this.
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Old 12-29-2013, 04:42 AM   #12
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Chaps

Making power on a FI can go a couple of routes

its a balancing act and always has been

if you have a a high static compression you run a bit less boost and possibly a bit more spark

if you have lower compression you run a bit more boost and bit less spark -

so yes you typically will experience less lag on the former solution but also you will be limited on the amount of power you make

other factors such as bore size, combustion chamber shape, fuel mix formation, rpm, torque curve shape etc etc all come into this

every engine is different and even then there's no 'right' approach - just different techniques with different compromises
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Old 12-29-2013, 05:03 AM   #13
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I've always heard that you want lower compression with turbo, so there is less chance of "detonation" and knock. And that you want higher compression for s/c or just n/a.

So yea this makes sense to me. But I don't really quite understand what I'm talking about anyway.

Still, I wouldn't put a turbo on these stock high compression engines.
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Old 01-07-2014, 03:18 PM   #14
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I've always heard that you want lower compression with turbo, so there is less chance of "detonation" and knock. And that you want higher compression for s/c or just n/a.

So yea this makes sense to me. But I don't really quite understand what I'm talking about anyway.

Still, I wouldn't put a turbo on these stock high compression engines.
That's the whole point with these pistons. They lower the compression to allow much more boost or the same boost at safer levels.
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