Super vs Turbocharging the car - Page 6 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

ahausheer · 06-17-2012, 04:17 PM

Noob question: Could you get a crankshaft that reduces stroke length to lower compression? Is this ever effective or used or do people just get lower compression pistons?

uspspro · 06-17-2012, 04:26 PM

The best way is pistons, the cheap (crap) way is thicker head gaskets.

Symbiont · 06-17-2012, 05:54 PM

I wonder if Subaru will offer a turbo aftermarket (if that's what they go for in the STi, of course), like TRD usually does with their S/C.

Considering that the compression ratio would almost definitely need to be dropped, I kind of doubt it, but it's nice to dream.

The main thing that would hold me back from FI is the drastic amount of changes that would need to be done to the engine to handle it (pistons, ECU, 3" exhaust system, etc.), even if I'm already considering a tune to smooth out the torque dip of death.

MANDALAY · 06-17-2012, 06:16 PM

I wouldnt think Subaru will Turbo the car as from a marketing approach would say it would eat into WRX sales.
I dont think there will be anything from Toyota also because again i believe they will reintroduce the Supra as a more expensive forced Induced car.

Both companies will retain both models as price conservative high volume sporty cars.

Look what Mazda did, they were in ruins and then released the MX5, With the sales they were able to introduce the RX8 and the revamped 3.

xwd · 06-17-2012, 09:17 PM

I think the cars are for different enough crowds and an STI version would be even lower volume than the WRX STI version. It would likely be between 32-35K so that prices it out of reach for a lot of folks. Subaru makes three levels of Impreza, I don't think you'll see that with the BRZ probably only two.

Subaru isn't going to make a bolt on turbo upgrade. They have never done that and there is just too much to change out.

The compression ratio is the big issue IMHO. The car already requires premium gas NA, I think a piston swap will be mandatory to be safe unless you are willing to run E85 all the time, which you could do, or some kind if race gas.

GirlyScions · 06-17-2012, 10:01 PM

If I was to chance boost on this high compression engine it would be a positive displacement S/C. Such as a eaton mp62 or a jackson. Simply because there are no kits available and S/C will be cheeper and simpler to install.

These superchargers also only come on during wot which is great for when you need power and youll keep your daily mpg.

Id prefer a factory sti turbo brz though.

Coheed · 06-18-2012, 12:59 AM

I think the centrifugal charger is the best option for the space constraints. Easy, compact, self-contained, no extra oil/water lines. Less heat to deal with.

But I also think a larger turbo BRZ would be nice. I have a 6262 bb on my SR20VE in my sentra. It's amazing, 10psi made 365whp. 19psi made 517whp. I have no custom tune either. Rom tune from jim wolf technology.

The response is terrible under 4k rpm. But when the big cam lobes kick in (ala vtec) it hits boost instantly. Once the turbo is spooled, the response is near instant.

robo_robb · 06-18-2012, 04:41 PM

Personally, I would prefer a Supercharger on a car with reflexes this sharp. Throttle response is paramount.

Unleashed · 06-18-2012, 11:25 PM

Really noob question, but I heard people talking about running E85 to compensate for the high compression ration. Is that true?

Don@Accelerated · 06-19-2012, 12:04 AM

I'm currently working on a turbo kit. Its very simple to get that low end torque with a turbo when setup correctly.

MANDALAY · 06-19-2012, 03:50 AM

Rotrex would be easy.

The way i see it , remove the bid resonator and that tube.
Make a bracket to the left of the alternator and put a restrictor on the inlet and feed the TB.

Low psi , no intercooler , stock internals and hell maybe even the stock ECU could handle it. 5 psi and you will definitely gain 50 -70 Hp

Swift Racing Technologies · 06-19-2012, 12:47 PM

Patience Grasshopper there are definitely FI under development for this platform. Details will be released soon

MANDALAY · 07-10-2012, 09:48 AM

There are a few happening at the same time around the world.

catharsis · 07-10-2012, 10:21 AM

Quote:

Originally Posted by Don@Accelerated

I'm currently working on a turbo kit. Its very simple to get that low end torque with a turbo when setup correctly.

theres always some turbo lag. I think a small turbo would be ok for this car. But supercharging is ideal.

06-17-2012, 04:17 PM	#71
ahausheer Re-member Join Date: Nov 2011 Drives: Toyota camry Location: S. Cali Posts: 1,001 Thanks: 98 Thanked 292 Times in 152 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Noob question: Could you get a crankshaft that reduces stroke length to lower compression? Is this ever effective or used or do people just get lower compression pistons? __________________ Nothing decays like progress, and nothing preserves like neglect.

06-18-2012, 11:25 PM	#79
Unleashed Senior Member Join Date: Jun 2012 Drives: 13' WRX Location: Las Vegas Posts: 673 Thanks: 183 Thanked 174 Times in 111 Posts Mentioned: 20 Post(s) Tagged: 1 Thread(s)	Noob Question Really noob question, but I heard people talking about running E85 to compensate for the high compression ration. Is that true?

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06-17-2012, 04:26 PM	#72
uspspro Senior Member Join Date: Mar 2012 Drives: DGM BRZ, MR-S 3.5L V6 swap (sold) Location: Bay Area, CA Posts: 602 Thanks: 28 Thanked 188 Times in 121 Posts Mentioned: 1 Post(s) Tagged: 1 Thread(s)	The best way is pistons, the cheap (crap) way is thicker head gaskets.

06-17-2012, 06:16 PM	#74
MANDALAY Banned Join Date: Jun 2012 Drives: MR2 Location: AUSTRALIA Posts: 146 Thanks: 3 Thanked 38 Times in 31 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I wouldnt think Subaru will Turbo the car as from a marketing approach would say it would eat into WRX sales. I dont think there will be anything from Toyota also because again i believe they will reintroduce the Supra as a more expensive forced Induced car. Both companies will retain both models as price conservative high volume sporty cars. Look what Mazda did, they were in ruins and then released the MX5, With the sales they were able to introduce the RX8 and the revamped 3.

06-17-2012, 09:17 PM	#75
xwd Senior Member Join Date: Feb 2012 Drives: 2013 DGM Subaru BRZ (Subie #9) Location: ATL, US Posts: 2,667 Thanks: 123 Thanked 861 Times in 552 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	I think the cars are for different enough crowds and an STI version would be even lower volume than the WRX STI version. It would likely be between 32-35K so that prices it out of reach for a lot of folks. Subaru makes three levels of Impreza, I don't think you'll see that with the BRZ probably only two. Subaru isn't going to make a bolt on turbo upgrade. They have never done that and there is just too much to change out. The compression ratio is the big issue IMHO. The car already requires premium gas NA, I think a piston swap will be mandatory to be safe unless you are willing to run E85 all the time, which you could do, or some kind if race gas.

06-17-2012, 10:01 PM	#76
GirlyScions Member Join Date: May 2012 Drives: Mazda3 Location: PA Posts: 61 Thanks: 5 Thanked 19 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	If I was to chance boost on this high compression engine it would be a positive displacement S/C. Such as a eaton mp62 or a jackson. Simply because there are no kits available and S/C will be cheeper and simpler to install. These superchargers also only come on during wot which is great for when you need power and youll keep your daily mpg. Id prefer a factory sti turbo brz though.

06-18-2012, 12:59 AM	#77
Coheed Senior Member Join Date: Jun 2012 Drives: DGM BRZ Limited Location: Seattle Posts: 813 Thanks: 209 Thanked 225 Times in 157 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I think the centrifugal charger is the best option for the space constraints. Easy, compact, self-contained, no extra oil/water lines. Less heat to deal with. But I also think a larger turbo BRZ would be nice. I have a 6262 bb on my SR20VE in my sentra. It's amazing, 10psi made 365whp. 19psi made 517whp. I have no custom tune either. Rom tune from jim wolf technology. The response is terrible under 4k rpm. But when the big cam lobes kick in (ala vtec) it hits boost instantly. Once the turbo is spooled, the response is near instant.

06-18-2012, 04:41 PM	#78
robo_robb Member Join Date: Apr 2010 Drives: Whiteout FR-S Location: NJ Posts: 88 Thanks: 37 Thanked 56 Times in 23 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Personally, I would prefer a Supercharger on a car with reflexes this sharp. Throttle response is paramount.

06-19-2012, 12:04 AM	#80
Don@Accelerated Join Date: Jun 2012 Drives: 2013 BRZ Location: Toledo Ohio Posts: 880 Thanks: 6 Thanked 1,162 Times in 316 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	I'm currently working on a turbo kit. Its very simple to get that low end torque with a turbo when setup correctly.

06-19-2012, 03:50 AM	#81
MANDALAY Banned Join Date: Jun 2012 Drives: MR2 Location: AUSTRALIA Posts: 146 Thanks: 3 Thanked 38 Times in 31 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Rotrex would be easy. The way i see it , remove the bid resonator and that tube. Make a bracket to the left of the alternator and put a restrictor on the inlet and feed the TB. Low psi , no intercooler , stock internals and hell maybe even the stock ECU could handle it. 5 psi and you will definitely gain 50 -70 Hp

06-19-2012, 12:47 PM	#82
Swift Racing Technologies Join Date: Jun 2012 Drives: 2013 Scion FR-S Location: Boostville, MD Posts: 149 Thanks: 126 Thanked 321 Times in 78 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Patience Grasshopper there are definitely FI under development for this platform. Details will be released soon

07-10-2012, 09:48 AM	#83
MANDALAY Banned Join Date: Jun 2012 Drives: MR2 Location: AUSTRALIA Posts: 146 Thanks: 3 Thanked 38 Times in 31 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	There are a few happening at the same time around the world.

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