Would you guys prefer FB20 or FB25 for NA FT? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

tranzformer · 04-07-2011, 03:38 AM

Which would you prefer between FB20 or FB25. Is one a better match to the car? FB25 is larger and would have more torque but also weigh more. Is the 2 liter the best fit?

OldSkoolToys · 04-07-2011, 03:42 AM

The 2.0L...because it'll be sufficient.

Jordo! · 04-07-2011, 04:22 AM

How much more weight vs how much more potential?

ollin · 04-07-2011, 05:06 AM

although 2l is fine the option for a sporty 2.5l version would be nice. Also if they turbo the 2l the US may never see it and get stuck with just the 2.5l

Exage · 04-07-2011, 12:22 PM

Neither, the engine will be based off of one of those two engines but will require a slight re-design.

tranzformer · 04-07-2011, 01:00 PM

Quote:

Originally Posted by Exage

Neither, the engine will be based off of one of those two engines but will require a slight re-design.

That was the point of the discussion. Would you rather use the 2 liter or the 2.5 liter as the blueprint for the FT engine.

Exage · 04-07-2011, 02:07 PM

Quote:

Originally Posted by tranzformer

That was the point of the discussion. Would you rather use the 2 liter or the 2.5 liter as the blueprint for the FT engine.

Ideally and put very simply a de-stroked (and 1.5-1.6 rod to stroke) FB25, with a beefier/smaller cylinder bore reduced to 2.0L with a higher compression ratio (11:1-12:1). AVCS, and D-4S. Revised heads, intake and exhaust manifold, camshaft. Optimized ignition and fuel mapping.

Ryephile · 04-07-2011, 06:19 PM

Interesting, I hadn't considered a de-stroked & higher revving FB25 being in the cards. Good call, I hope you're right!

aliphian · 04-07-2011, 06:30 PM

I can't imagine a huge weight difference between the two.

ichitaka05 · 04-07-2011, 06:58 PM

Quote:

Originally Posted by aliphian

I can't imagine a huge weight difference between the two.

Ditto, SOHC EJ20 & EJ25 weight pretty close.

Anyways back to the topic, 2.5L would be ideal tq for dd car... BUT I want nice 2L smooth high rev car.

4agze · 04-07-2011, 07:15 PM

Cant say yet I havent driven a subaru with a FB yet, all this questions like what will you get toyota or subaru version? is a silly questions to me, no clear specs or numers yet as for my understanding the FT86 is only getting a 2.0liter.

Fortunate Few · 04-07-2011, 09:18 PM

2.0T is what im hoping for. I don't think i'd go for 2.5.

aliphian · 04-07-2011, 09:32 PM

I'd be DOWN with a 2.5 if it weren't just a stroked 2.0.

tranzformer · 04-07-2011, 10:01 PM

Quote:

Originally Posted by Exage

Ideally and put very simply a de-stroked (and 1.5-1.6 rod to stroke) FB25, with a beefier/smaller cylinder bore reduced to 2.0L with a higher compression ratio (11:1-12:1). AVCS, and D-4S. Revised heads, intake and exhaust manifold, camshaft. Optimized ignition and fuel mapping.

Sounds like a sweet design. Hopefully Toyobaru will come out with something along those lines.

This might be a dumb question, but what is gained by destroking an engine (say from 2.5L to 2.0L) vs. boring a 1.8L to 2.0L? Do you gain something in the process (durability, revs, tq....etc.) or is a 2.0L a 2.0L?

04-07-2011, 03:38 AM	#1
tranzformer Delights in pure handling Join Date: Apr 2011 Drives: Zoom Zoom Location: KS Posts: 4,854 Thanks: 0 Thanked 15 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Would you guys prefer FB20 or FB25 for NA FT? Which would you prefer between FB20 or FB25. Is one a better match to the car? FB25 is larger and would have more torque but also weigh more. Is the 2 liter the best fit?

04-07-2011, 06:19 PM	#8
Ryephile Hot Dog Join Date: Apr 2011 Drives: quicker than arghx7 Location: Metro Detroit Posts: 1,316 Thanks: 103 Thanked 173 Times in 83 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Interesting, I hadn't considered a de-stroked & higher revving FB25 being in the cards. Good call, I hope you're right! __________________ "Wisdom is a not a function of age, but a function of experience." Just Say No to unqualified aftermarket products.

04-07-2011, 06:30 PM	#9
aliphian Dreamer Join Date: Mar 2011 Drives: Nutless Grocery Getter Location: California Posts: 375 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I can't imagine a huge weight difference between the two. __________________ "Reality is merely an illusion, albeit a very persistent one."

04-07-2011, 09:32 PM	#13
aliphian Dreamer Join Date: Mar 2011 Drives: Nutless Grocery Getter Location: California Posts: 375 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I'd be DOWN with a 2.5 if it weren't just a stroked 2.0. __________________ "Reality is merely an illusion, albeit a very persistent one."

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04-07-2011, 04:22 AM	#3
Jordo! Enjoy it, destroy it. Join Date: Oct 2009 Drives: Datsun Racing Hen Location: Blank Generation Posts: 820 Thanks: 6 Thanked 61 Times in 48 Posts Mentioned: 1 Post(s) Tagged: 2 Thread(s)	How much more weight vs how much more potential?

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ollin Member Join Date: Apr 2011 Drives: 300zx 2+2 TT Location: Gainesville Posts: 18 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	although 2l is fine the option for a sporty 2.5l version would be nice. Also if they turbo the 2l the US may never see it and get stuck with just the 2.5l

04-07-2011, 12:22 PM	#5
Exage GL 86! Join Date: Mar 2011 Drives: Maybe FR-S... maybe not Location: NA Posts: 356 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Neither, the engine will be based off of one of those two engines but will require a slight re-design.

04-07-2011, 09:18 PM	#12
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