2.5L with lower revs/more torque, or 2.0L with higher revs? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Anaxilus · 08-23-2013, 12:59 AM

Quote:

Originally Posted by Noob4Life

Considering I'm going SC, I'll take higher revs!

What? Displacement would be better for PD. If you want to rev, get a turbo.
________

Displacement; easier to take care of revs on my own if need be than reconstruct a block that has no material to machine.

Personally I think it's a false choice. They are talking 254bhp from a 2.5L, that's better than 197 from 2.0. 2.5 might possibly even rev a little higher than the 2.0 w/ those figures. Honestly, it's going to be in the ballpark to not really matter much unless you're at Talledega.

Sonolin · 08-23-2013, 01:07 AM

I'll take more revs pls

Wes B. · 08-23-2013, 01:24 AM

Quote:

Originally Posted by ATL BRZ

There is no replacement for displacement!

Yes there is. It's called engineering.

Quote:

Originally Posted by Genomaxter

Ill take higher revs and 2.0L. I want more specific output from a screamer. Its all in the intake manifold design.

It's actually more dependent on the cylinder head and camshaft design...

LeeMaster · 08-23-2013, 02:15 AM

I had a decade old 2.4 liter Honda engine with an RSX type s head that revved up to 8,100rpm. So obviously I choose wisely a 2.5 with more torque(That can be lego into an FA20 head or other better future aftermarket head for higher RPM).

Winner winner chicken dinner

Anaxilus · 08-23-2013, 02:29 AM

Quote:

Originally Posted by Wes B.

Yes there is. It's called engineering.

No, not really. Whatever you do to a smaller engine to make it meet or exceed the larger one can also be done to the larger one taking the advantage back. More volume means more power potential due to more room for more air/fuel. FI's original intent was compensation for less volume but can be applied to anything including a 8.0L V10. Imagine the numbers you get w/ 30psi on that versus a 1.6L.
________

3.0L V10's in F1 reved to 18,000 RPM. The new Porsche 3.8L Turbo H-6 goes to 7200 RPM. What's the big scare about a 2.5L? Just sayin'.

asia_minor · 08-23-2013, 02:32 AM

over 9000.

diss7 · 08-23-2013, 02:41 AM

Quote:

Originally Posted by lickitysplit

They already sell that car. Its called a WRX

There's a 2 door, lightweight, rear wheel drive, good looking wrx? Kthxbi

Bach415 · 08-23-2013, 03:05 AM

I'm sure 2.5L with high rev is possible. If tuners from the Honda scene manage to create a frankenstein motor that is 2.4L and also make it high rev at the same time w/ oem parts, I'm sure toyobaru can do it too.

shellslinger · 08-23-2013, 03:06 AM

Quote:

Originally Posted by diss7

There's a 2 door, lightweight, rear wheel drive, good looking wrx? Kthxbi

I think the wrx is good looking

diss7 · 08-23-2013, 03:09 AM

Quote:

Originally Posted by shellslinger

I think the wrx is good looking

So did I, five years ago, when it was.

arghx7 · 08-23-2013, 06:48 AM

Whatever Subaru releases, it's highly likely it will stay 2.0 liters for business reasons. I would be surprised if they increased displacement. Anything over 2.0 liters gets pushed into a higher tax bracket in a lot of countries. That's why the JDM WRX STi was a 2 liter. They would have to release a 2.5 for the American market only. They've been doing that for years with the STi, so it's certainly possible, but I'd be surprised if they did it.

If it's turbo, it will probably fall on its face at 5000rpm and hit rev limit at 6000ish, just like almost every other modern turbo DI engine.

lickitysplit · 08-23-2013, 08:54 AM

Quote:

Originally Posted by diss7

There's a 2 door, lightweight, rear wheel drive, good looking wrx? Kthxbi

Nope, but if all you want is moar power then having a 2door, light weight , rwd car doesnt matter.

diss7 · 08-23-2013, 08:58 AM

Quote:

Originally Posted by lickitysplit

Nope, but if all you want is moar power then having a 2door, light weight , rwd car doesnt matter.

Because 250hp is too much for a rwd platform to control?

(Its not)

Turdinator · 08-23-2013, 08:59 AM

A high revving 2.5l 4cyl would require a new engine. The Subaru FB25 has a stroke of 94mm. That is not a good start for a high revving 4cyl. Now a 2.5l 6cyl could have a nice short stroke and could be designed with a better rod:stroke ratio. I wonder how hard it would be to de-stroke the EZ30 bump the comp to 12.5:1 and add D4S injection...

View Poll Results: Toyobaru asks...you respond?
2.5L, more torque, less revs.	92	45.32%
2.0L, same torque, more revs.	111	54.68%
Voters: 203. You may not vote on this poll

08-23-2013, 02:15 AM	#18
LeeMaster Red wine Join Date: Oct 2012 Drives: Subaru BRZ(R.I.P) Location: Denied Posts: 1,176 Thanks: 1,268 Thanked 342 Times in 240 Posts Mentioned: 13 Post(s)	I had a decade old 2.4 liter Honda engine with an RSX type s head that revved up to 8,100rpm. So obviously I choose wisely a 2.5 with more torque(That can be lego into an FA20 head or other better future aftermarket head for higher RPM). Winner winner chicken dinner __________________

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08-23-2013, 01:07 AM	#16
Sonolin Banned Join Date: Sep 2012 Drives: 2013 Scion FR-S Location: SoCal Posts: 885 Thanks: 1,489 Thanked 289 Times in 176 Posts Mentioned: 5 Post(s)	I'll take more revs pls

08-23-2013, 02:32 AM	#20
asia_minor Superleggera Join Date: Jan 2013 Drives: 2016 Mazda MX-5 Location: San Francisco, CA Posts: 191 Thanks: 72 Thanked 68 Times in 48 Posts Mentioned: 0 Post(s)	over 9000.

08-23-2013, 03:05 AM	#22
Bach415 Senior Member Join Date: Feb 2013 Drives: Whiteout FRS Location: San Francisco Posts: 1,255 Thanks: 909 Thanked 416 Times in 297 Posts Mentioned: 31 Post(s)	I'm sure 2.5L with high rev is possible. If tuners from the Honda scene manage to create a frankenstein motor that is 2.4L and also make it high rev at the same time w/ oem parts, I'm sure toyobaru can do it too.

08-23-2013, 06:48 AM	#25
arghx7 Senior Member Join Date: Nov 2011 Drives: car Location: cold Posts: 599 Thanks: 72 Thanked 613 Times in 185 Posts Mentioned: 33 Post(s)	Whatever Subaru releases, it's highly likely it will stay 2.0 liters for business reasons. I would be surprised if they increased displacement. Anything over 2.0 liters gets pushed into a higher tax bracket in a lot of countries. That's why the JDM WRX STi was a 2 liter. They would have to release a 2.5 for the American market only. They've been doing that for years with the STi, so it's certainly possible, but I'd be surprised if they did it. If it's turbo, it will probably fall on its face at 5000rpm and hit rev limit at 6000ish, just like almost every other modern turbo DI engine.

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