Turbo FA in the new JDM Legacy, next WRX - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

NYC BRZ · 05-08-2012, 04:47 PM

I think the TRD supercharger, albeit sacreligious on a BRZ, is the way to go with this car.

Guff · 05-08-2012, 04:52 PM

http://www.ft86club.com/forums/showt...370#post204370

OrbitalEllipses · 05-08-2012, 04:52 PM

Quote:

Originally Posted by NYC BRZ

I think the TRD supercharger, albeit sacreligious on a BRZ, is the way to go with this car.

I think you're on the right track. A supercharger is likely going to be the way to go. Can't wait to experience the OTHER boost.

dsgerbc · 05-08-2012, 05:05 PM

Given that it's mated to CVT it's probably a pretty peaky engine and won't be a good match for MT sports car.

SkullWorks · 05-08-2012, 05:06 PM

ummm....not the same motor....

besides that, if you are still fixated on SC's you haven't been paying attention to the latest Turbos...for instance this is my 2.0L SR20

notice it makes 8psi by 3000rmp and that's without using the top wastegate port to assist spool up...

also makes 260whp on 6psi wastegate pressure

Exhaust · 05-08-2012, 05:11 PM

soooooo engine swap anyone?

NYC BRZ · 05-08-2012, 05:12 PM

Maybe Subaru will Twin Charge it!

ichitaka05 · 05-08-2012, 05:17 PM

Quote:

Originally Posted by Exhaust

soooooo engine swap anyone?

Prob won't work w/o stand alone... Due to different DI

nibor33 · 05-08-2012, 05:17 PM

It's not about the torque curve... Turbos typically have poorer throttle response. The actual spool up time can make throttle modulation difficult. Enought to possibly upset the balance while navigating a corner (at the limits, on a track). I know there are some methods to reduce this response time, but I don't think they will be appearing in daily drivers any time soon. You'll never see throttle response on a dyno graph, since it's floored the whole time.

SkullWorks · 05-08-2012, 05:21 PM

correct, but I drove it. and while it isn't NA with ITB's quick it will melt tires before the pedal hits the floor and you can get back out...in 3rd gear.

low end boost helps to represent what the throttle response will look like.

Exhaust · 05-08-2012, 05:32 PM

Quote:

Originally Posted by ichitaka05

Prob won't work w/o stand alone... Due to different DI

curse youuuuuu minor oversight!!

arghx7 · 05-08-2012, 05:39 PM

It's likely this is a downsized and "downspeeded" engine. It probably hits peak torque ostensibly at 1700-2000rpm and falls on its face by 5000-5500. That's how these types of engines are. It may employ heavy use of external EGR, possibly cooled EGR like a diesel.

It's not going to use the D-4S system because there's really no point in doing so. The D-4S system, as currently implemented, is expensive and only makes sense for n/a engines. I suspect this new engine will have one solenoid-type multi-hole injector positioned between the intake valves.

The CVT is a wild card here. The calibration of the CVT and the electronic throttle will affect the driving feel greatly. If you've ever driven a Juke with CVT (1.6 direct injected turbo), they technically heat peak torque at very low rpm but you can't feel it due to the CVT calibration.

Sasquachulator · 05-08-2012, 05:55 PM

Well the D4-S system is Toyota property.....they probably dont want to share that tech with Subaru on a motor that is seeing Non-Toyota applications.

And doesnt the current new Impreza use a CVT also? I would say that would be a good indication of how the CVT would be calibrated in this new Legacy.

SkullWorks · 05-08-2012, 05:59 PM

Quote:

Originally Posted by arghx7

It's not going to use the D-4S system because there's really no point in doing so. The D-4S system, as currently implemented, is expensive and only makes sense for n/a engines. I suspect this new engine will have one solenoid-type multi-hole injector positioned between the intake valves.

Negative Charlie.

DI and FI are highly compatible, "as currently implemented" doesn't mean a whole lot, the hardware is there...tune it for turbo...control strategy changes for everything lets not make it out like different shape injectors are needed for turbo, the hardware can go unchanged (except potentially flow rate)

Charge cooling is one of the largest benefits of DI systems and they are all but lost on a N/A motor....FI loves DI

05-08-2012, 04:47 PM	#15
NYC BRZ AutoX Addict Join Date: Mar 2012 Drives: 08 Pontiac G8 GT,13 GBS BRZ Limited Location: Queens, NY Posts: 723 Thanks: 168 Thanked 118 Times in 83 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I think the TRD supercharger, albeit sacreligious on a BRZ, is the way to go with this car. __________________ 2013 BRZ Limited- GBS - 6MT -VIN #0937 ~~NYR SCCA # 18 C Street R (CSR)~~ "But there’s no mistaking the noise. This car is loud, and not in a particularly nice way. There’s no crisp exhaust note, no induction wheezing. It’s just the sound of petrol exploding in a metal box." - Jeremy Clarkson

05-08-2012, 05:12 PM	#21
NYC BRZ AutoX Addict Join Date: Mar 2012 Drives: 08 Pontiac G8 GT,13 GBS BRZ Limited Location: Queens, NY Posts: 723 Thanks: 168 Thanked 118 Times in 83 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Maybe Subaru will Twin Charge it! __________________ 2013 BRZ Limited- GBS - 6MT -VIN #0937 ~~NYR SCCA # 18 C Street R (CSR)~~ "But there’s no mistaking the noise. This car is loud, and not in a particularly nice way. There’s no crisp exhaust note, no induction wheezing. It’s just the sound of petrol exploding in a metal box." - Jeremy Clarkson

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05-08-2012, 05:05 PM	#18
dsgerbc Senior Member Join Date: Jan 2012 Drives: BRZ(sold), STI Location: A2, MI Posts: 1,915 Thanks: 176 Thanked 419 Times in 241 Posts Mentioned: 11 Post(s) Tagged: 0 Thread(s)	Given that it's mated to CVT it's probably a pretty peaky engine and won't be a good match for MT sports car.

05-08-2012, 05:06 PM	#19
SkullWorks Banned Join Date: Mar 2012 Drives: SSM LT MT BRZ Location: SoCal Posts: 1,033 Thanks: 803 Thanked 754 Times in 328 Posts Mentioned: 23 Post(s) Tagged: 1 Thread(s)	ummm....not the same motor.... besides that, if you are still fixated on SC's you haven't been paying attention to the latest Turbos...for instance this is my 2.0L SR20 notice it makes 8psi by 3000rmp and that's without using the top wastegate port to assist spool up... also makes 260whp on 6psi wastegate pressure

05-08-2012, 05:21 PM	#24
SkullWorks Banned Join Date: Mar 2012 Drives: SSM LT MT BRZ Location: SoCal Posts: 1,033 Thanks: 803 Thanked 754 Times in 328 Posts Mentioned: 23 Post(s) Tagged: 1 Thread(s)	correct, but I drove it. and while it isn't NA with ITB's quick it will melt tires before the pedal hits the floor and you can get back out...in 3rd gear. low end boost helps to represent what the throttle response will look like.

05-08-2012, 05:39 PM	#26
arghx7 Senior Member Join Date: Nov 2011 Drives: car Location: cold Posts: 599 Thanks: 72 Thanked 611 Times in 185 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	It's likely this is a downsized and "downspeeded" engine. It probably hits peak torque ostensibly at 1700-2000rpm and falls on its face by 5000-5500. That's how these types of engines are. It may employ heavy use of external EGR, possibly cooled EGR like a diesel. It's not going to use the D-4S system because there's really no point in doing so. The D-4S system, as currently implemented, is expensive and only makes sense for n/a engines. I suspect this new engine will have one solenoid-type multi-hole injector positioned between the intake valves. The CVT is a wild card here. The calibration of the CVT and the electronic throttle will affect the driving feel greatly. If you've ever driven a Juke with CVT (1.6 direct injected turbo), they technically heat peak torque at very low rpm but you can't feel it due to the CVT calibration.

05-08-2012, 05:55 PM	#27
Sasquachulator Pavement Grey Join Date: Dec 2011 Drives: 2020 Toyota Camry XSE, 2017 BMW X1 Location: Calgary Posts: 3,116 Thanks: 109 Thanked 2,256 Times in 1,221 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Well the D4-S system is Toyota property.....they probably dont want to share that tech with Subaru on a motor that is seeing Non-Toyota applications. And doesnt the current new Impreza use a CVT also? I would say that would be a good indication of how the CVT would be calibrated in this new Legacy.

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