Internal/s capacity? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Matey · 02-11-2017, 11:50 PM

I'm starting the actual process of dwindling down the FI kit that I will be finally buying later this year and I can't seem to find anything from searching so I'm hoping someone sees this and can lead me in the right direction. What is the limit of the stock motor with FI? I know I'll need pump/injectors (aiming for about 320-330 rwhp) but I'm more worried about rods, etc. Any notable power ranges that the engine becomes unstable or WILL break at 300+? Trying to get that out of the way by going ahead and buying if it's a possible issue.

TIA

Barefootdan · 02-12-2017, 12:05 AM

I think people try to stay under 300whp for a "reliable" setup. I know some have gone well into the 350+ zone with no issues on e85. But thats just playing borrowed time at those levels if it isnt a dyno queen.

Stimmed · 02-12-2017, 01:31 AM

Quote:

Originally Posted by Barefootdan

I think people try to stay under 300whp for a "reliable" setup. I know some have gone well into the 350+ zone with no issues on e85. But thats just playing borrowed time at those levels if it isnt a dyno queen.

I agree. People are pushing higher like to 400 stock but I think if you want to be able to drive it and enjoy it a without worrying if you will blow it 300 is a nice number.

Matey · 02-12-2017, 04:56 PM

Thanks guys. Guess it's time to find out if I really want to spend the extra couple grand just to push my car to 330. at that point i'd probably shoot for 350

Dfyfzx · 02-13-2017, 12:42 AM

I'd also consider the Tq curve you're shooting for. A smooth, linear curve from a centrifugal Supercharger will be less stressful to internals than a low end Tq monster like a roots/twinscrew blower. I used Superchargers as an example but turbos have different curves as well depending on the turbo size and kit designs. Horsepower isn't the top culprit for breaking things, torque is.

GsxrMe · 02-13-2017, 08:19 AM

Its all about your tune. My tuner didnt aim for instant torque so the car feels entirely stock at low rpm and low throttle under 3k. Tomuch low end torque does bend rods.

Barefootdan · 02-13-2017, 04:12 PM

Excuse my lack of knowledge but...Does the low end torque make a difference when driving spiritedly, or is it strictly when below 3k or something? Let's say you're at 5k rpm, off throttle into a corner, then back onto throttle 100%. If the centrifugal and roots make the same torque at 5k rpm, will the engine take it the same?

Dfyfzx · 02-13-2017, 06:35 PM

Quote:

Originally Posted by Barefootdan

Excuse my lack of knowledge but...Does the low end torque make a difference when driving spiritedly, or is it strictly when below 3k or something? Let's say you're at 5k rpm, off throttle into a corner, then back onto throttle 100%. If the centrifugal and roots make the same torque at 5k rpm, will the engine take it the same?

TQ is TQ no matter how it's made. 200ft/lb at 5000k rpm is just that no matter if it's supercharged, turbo, nitrous...

The thing to consider is driveline shock. A smooth, linear flow of Tq is better than no throttle to 100% all of a sudden.

All that being said, some people have catastrophic engine failure with the cruise control set just putting down a side street. There's been people have their engine go out bone stock. I wouldn't over think it. Bottom line, if you're worried about engine failure and don't have the means to replace your engine if you blow it, you probably shouldn't be bolting on 50% more power. I say, go for it👍🏻

mav1178 · 02-13-2017, 07:58 PM

200 to around 450+ HP. Give or take a few hundred.

02-11-2017, 11:50 PM	#1
Matey Member Join Date: Jul 2013 Drives: Pearl White BRZ Location: Cheyenne, WY Posts: 50 Thanks: 1 Thanked 3 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Internal/s capacity? I'm starting the actual process of dwindling down the FI kit that I will be finally buying later this year and I can't seem to find anything from searching so I'm hoping someone sees this and can lead me in the right direction. What is the limit of the stock motor with FI? I know I'll need pump/injectors (aiming for about 320-330 rwhp) but I'm more worried about rods, etc. Any notable power ranges that the engine becomes unstable or WILL break at 300+? Trying to get that out of the way by going ahead and buying if it's a possible issue. TIA

02-13-2017, 08:19 AM	#6
GsxrMe Senior Member Join Date: Jul 2015 Drives: Late 2014 Subaru BRZ Location: Cape Coral, FL Posts: 557 Thanks: 20 Thanked 184 Times in 139 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Its all about your tune. My tuner didnt aim for instant torque so the car feels entirely stock at low rpm and low throttle under 3k. Tomuch low end torque does bend rods. __________________ 2014 Subaru BRZ FBM Turbokit: GTX3076R - ECUTEK HRI FlexFuel tune - FBM 3" Turboback Exhaust - 550cc Injectors - Walbro 485 Fuel Pump - 4bar Map Sensor - FBM Oil Pan - ACT SB7-XTSS - AMSOIL all fluids - Forester XT Oil Cooler - Cusco engine, trans mounts - Whiteline rear differential bushings - Perrin shifter bushing - Firehawk 235/45/17 - AEM Failsafe

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02-12-2017, 12:05 AM	#2
Barefootdan Senior Member Join Date: Oct 2016 Drives: 2017 BRZ Location: Phoenix, AZ Posts: 177 Thanks: 112 Thanked 130 Times in 67 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I think people try to stay under 300whp for a "reliable" setup. I know some have gone well into the 350+ zone with no issues on e85. But thats just playing borrowed time at those levels if it isnt a dyno queen.

02-12-2017, 04:56 PM	#4
Matey Member Join Date: Jul 2013 Drives: Pearl White BRZ Location: Cheyenne, WY Posts: 50 Thanks: 1 Thanked 3 Times in 3 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks guys. Guess it's time to find out if I really want to spend the extra couple grand just to push my car to 330. at that point i'd probably shoot for 350

02-13-2017, 12:42 AM	#5
Dfyfzx Member Join Date: Nov 2016 Drives: JRSC C38 HBP E85 FRS Location: Kansas City Posts: 25 Thanks: 0 Thanked 12 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I'd also consider the Tq curve you're shooting for. A smooth, linear curve from a centrifugal Supercharger will be less stressful to internals than a low end Tq monster like a roots/twinscrew blower. I used Superchargers as an example but turbos have different curves as well depending on the turbo size and kit designs. Horsepower isn't the top culprit for breaking things, torque is.

02-13-2017, 04:12 PM	#7
Barefootdan Senior Member Join Date: Oct 2016 Drives: 2017 BRZ Location: Phoenix, AZ Posts: 177 Thanks: 112 Thanked 130 Times in 67 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Excuse my lack of knowledge but...Does the low end torque make a difference when driving spiritedly, or is it strictly when below 3k or something? Let's say you're at 5k rpm, off throttle into a corner, then back onto throttle 100%. If the centrifugal and roots make the same torque at 5k rpm, will the engine take it the same?

02-13-2017, 07:58 PM	#9
mav1178 Senior Member Join Date: Apr 2013 Drives: 2005 Toyota Camry Location: 91745 Posts: 6,562 Thanks: 493 Thanked 6,099 Times in 3,030 Posts Mentioned: 95 Post(s) Tagged: 3 Thread(s)	200 to around 450+ HP. Give or take a few hundred.

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