Accelerated Performance 2013 BRZ - FRS Turbo Kit Designing

[Sportsguy83]

Originally Posted by Coheed

The last few toyota engines I have torn down have had really spindly connecting rods, with weaksauce bearing sizes.

This was probably just a general comment from you but to make sure, this is a Subaru engine not Toyota, so don't expect this this engine to fail similar to how Toyota engines commonly fail.

[Dimman]

Originally Posted by sportsguy83

This was probably just a general comment from you but to make sure, this is a Subaru engine not Toyota, so don't expect this this engine to fail similar to how Toyota engines commonly fail.

The EJ20 he mentioned is a Subaru motor.

[Sportsguy83]

Originally Posted by Dimman

The EJ20 he mentioned is a Subaru motor.

Fair, and exactly the reason I quoted only the Toyota sentence.

[Exhaust]

Originally Posted by sportsguy83

This was probably just a general comment from you but to make sure, this is a Subaru engine not Toyota, so don't expect this this engine to fail similar to how Toyota engines commonly fail.

face-palm.

[slow_frs]

Originally Posted by sportsguy83

This was probably just a general comment from you but to make sure, this is a Subaru engine not Toyota, so don't expect this this engine to fail similar to how Toyota engines commonly fail.

Hmm odd I've seen more subaru engines have piston ring failures than Toyota think about the design the pistons are sideways, gravity is constantly pulling the piston down on its side mix that with the stroking motion and it's like running something across a file over time the bottom side of the piston will flatten its just physics

[Sportsguy83]

Originally Posted by Exhaust

face-palm.

Originally Posted by slow_frs

Hmm odd I've seen more subaru engines have piston ring failures than Toyota think about the design the pistons are sideways, gravity is constantly pulling the piston down on its side mix that with the stroking motion and it's like running something across a file over time the bottom side of the piston will flatten its just physics

I am not saying that Toyota's engines regularly fail, or making a comparison between Toyota or Subaru engines. All I said was not to compare the possible failures of this engine with Toyota engines because it is a Subaru engine, nothing more.

[serialk11r]

Originally Posted by slow_frs

Hmm odd I've seen more subaru engines have piston ring failures than Toyota think about the design the pistons are sideways, gravity is constantly pulling the piston down on its side mix that with the stroking motion and it's like running something across a file over time the bottom side of the piston will flatten its just physics

Perhaps you should familiarize yourself with the typical order of magnitude of the acceleration forces pistons see. Gravity is measured in...well, 1g. Piston acceleration is measured in 1000s of gs.

[brewksy]

Originally Posted by serialk11r

Perhaps you should familiarize yourself with the typical order of magnitude of the acceleration forces pistons see. Gravity is measured in...well, 1g. Piston acceleration is measured in 1000s of gs.

Then why does Subaru recommend flipping the pistons every 25k miles to offset gravitational distortion of the piston heads. Duh.

[slow_frs]

Originally Posted by brewksy

Then why does Subaru recommend flipping the pistons every 25k miles to offset gravitational distortion of the piston heads. Duh.

thank you =D

[Don@Accelerated]

Due to popular demand i'm now going to use a Tial V Band Stainless Housing. Hopefully that gives me more room. And switching to an external gate as well. Tial MVR or MVS.

Will show some pictures tomorrow

[jedibow]

Originally Posted by Don@Accelerated

Due to popular demand i'm now going to use a Tial V Band Stainless Housing. Hopefully that gives me more room. And switching to an external gate as well. Tial MVR or MVS.

Will show some pictures tomorrow

v bands are awesome! They save room, don't require a gasket that can start leaking, and offer better flow characteristics when compared to flanges. Your good choices keep adding up!

Don,

On future kits will you offer a twin scroll manifold and turbo option?

[Coheed]

I recently did some testing with some twin scroll on my personal car. It made more mid-range. Felt more responsive. But it surged the GT3076r, even with the ported shroud... and the 1.06 turbine housing.

Twin scroll is nice, but the housings offered don't quite flow as well as I expected. T4 is a good platform for twinscroll. But I'm not a believer in anything smaller. There is a trade-off in top end vs the increase in spoolup. I have interesting data to share however.

[jedibow]

also with twin scroll no v-band option. With mitsu's we haven't seen issues with twin scrolls running out of steam up top? The 9 turbo, easily out flows the 3 turbo, I think it has to do more with compressor housing design, than turbine housing design.

G

[Don@Accelerated]

I won't be considering twin scroll until we get into larger turbo setups that require all cats take a hike. Then i'll put the turbo's up front.

Originally Posted by Coheed

I recently did some testing with some twin scroll on my personal car. It made more mid-range. Felt more responsive. But it surged the GT3076r, even with the ported shroud... and the 1.06 turbine housing.

Twin scroll is nice, but the housings offered don't quite flow as well as I expected. T4 is a good platform for twinscroll. But I'm not a believer in anything smaller. There is a trade-off in top end vs the increase in spoolup. I have interesting data to share however.

[jedibow]

Don, I've been dreaming about a forced performance ball bearing green on this car, make it a reality...

Dooooo ittttttttt!

JK I will be patient

G

[Don@Accelerated]

I've had to catchup from over the weekend here. There was alot of talk of this and that, and I can say alot of you are just overthinking it.

Especially w/ the high RPM talk. Peak TQ is more important and far more dangerous.

[Coheed]

I think the GT28 series is the best option for now. 300whp is good, and the disco will do that easily. The GT2871r is a bit too big for the turbine size though, and looses points in my book. I like a well-sorted turbo, with careful attention to wheel size.

The GT30 with the T2 housing would be the best option for a decently powerful setup. GT3071r, t2 housing? .86 ar.

[slow_frs]

Originally Posted by Don@Accelerated

Due to popular demand i'm now going to use a Tial V Band Stainless Housing. Hopefully that gives me more room. And switching to an external gate as well. Tial MVR or MVS.

Will show some pictures tomorrow

eww that just bumps the price that much higher, function over form guys, you know that there is nothing wrong with a standard t3 for what goals you have

[JP]

I'd prefer v-bands over bolt flanges any day of the week.

[Don@Accelerated]

I'm doing it for packaging restraints mostly.

Originally Posted by slow_frs

eww that just bumps the price that much higher, function over form guys, you know that there is nothing wrong with a standard t3 for what goals you have

[Coheed]

I think it's a good call. The Vband has better packaging all-around, and the SS housings have better castings with better flow. Super-easy to work on as well. I don't see why there isn't more dedication to these bolt-less designs.

[bakerr6]

if you are complaining about teh few hundred dollars in price increase, for someone providing a better kit, I think you should rethink going FI. I for one praise Don for going v-band, as it saves time, and cleans up the build substantially.