Problems with my Twinscroll Turbo - Please help :) - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Dipstik-sportech · 11-02-2014, 02:02 PM

Same engine design? Like another boxer or another fa20? 23psi on a gtx28 on pump gas!!?? Wow that turbo is going to be blowing nothing but hot air over 18-19psi. If I was going twin scroll I would've done a gtx3071 at a minimum, that's why u go twin scroll is so u can use a larger turbo but not lose spool. Having a lower compression engine allows for more air from a larger turbo. I think that the little 28 just doesn't have the lungs to feed the demands of a built lower compression fa20. Mine hit 360whp on 91 pump at 16psi

Tiz · 11-02-2014, 03:19 PM

@Dipstik Not another boxer but another FA20
@all It seems that a GTX2867R is simply not capable of reaching its hp rating on pump gas. A bigger turbo seems to be a better choice.

Dipstik-sportech · 11-02-2014, 03:48 PM

If you factor in 17% drivetrain loss you're at 430ish whp so that's not bad considering.

Tiz · 11-02-2014, 03:53 PM

Quote:

Originally Posted by Dipstik-sportech

If you factor in 17% drivetrain loss you're at 430ish whp so that's not bad considering.

Unfortunately, I believe it's the other way round. The dyno numbers I got (350-370hp) have already factored in the drivetrain loss. This is what OEM car manufactures and European tuners do. In other words, the whp are lower...probably around 300 whp.

I am not sure whether the supposed drivetrain loss is 10, 15, 17 or 20 percent.

Dipstik-sportech · 11-02-2014, 04:08 PM

So u only made 350 crank !!???? How is that even possible?

DRACHENV6 · 11-02-2014, 04:08 PM

can you post the dyno sheets?

Reaper · 11-02-2014, 04:17 PM

Sounds like @Synack s car

Tiz · 11-02-2014, 04:28 PM

I do not have dyno sheets right now. Tuning is still work in process and I got only preliminary results so far. But I will post follow-up info asap.

BRZPDX · 11-02-2014, 07:45 PM

Something is not right, I'm making 303whp at 10.5psi with a ebcs, 2.5 exhaust. gt3076 front mount/FMIC el headers. stock internals, injectors and fuel pimp. I am AT as well

Reaper · 11-02-2014, 07:47 PM

He's lower compression. That requires more airflow from an already undersized turbo (when twin scroll)

Synack · 11-03-2014, 11:24 AM

Yep lowered compression needs more boost to make the same power. Now with lowered compression it's going to be a lot safer, a little more lag, and have higher potential (if you want it).

Tiz · 11-20-2014, 04:07 PM

Update: My tuner found the missing power. Now the car makes approx. 410bhp and 500nm torque. More or less flat torque curve starting from 3300 rpm.

BUT: The OEM AT transmission cannot handle so much torque. Does anyone know about an upgrade? I understand that SSP is developing something?

Thanks.

Koa · 11-20-2014, 04:18 PM

What was the problem?

Tiz · 11-21-2014, 01:36 AM

I believe the diameter of one of the pipes was too small -> resulting in back pressure and high intake temps.

11-02-2014, 02:02 PM	#15
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	Same engine design? Like another boxer or another fa20? 23psi on a gtx28 on pump gas!!?? Wow that turbo is going to be blowing nothing but hot air over 18-19psi. If I was going twin scroll I would've done a gtx3071 at a minimum, that's why u go twin scroll is so u can use a larger turbo but not lose spool. Having a lower compression engine allows for more air from a larger turbo. I think that the little 28 just doesn't have the lungs to feed the demands of a built lower compression fa20. Mine hit 360whp on 91 pump at 16psi __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

11-02-2014, 03:48 PM	#17
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	If you factor in 17% drivetrain loss you're at 430ish whp so that's not bad considering. __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

11-02-2014, 04:08 PM	#19
Dipstik-sportech Senior Member Join Date: Oct 2012 Drives: 2013 BRZ satin white pearl sportech Location: Thunder Bay Ontario Canada Posts: 1,813 Thanks: 842 Thanked 911 Times in 576 Posts Mentioned: 43 Post(s) Tagged: 0 Thread(s)	So u only made 350 crank !!???? How is that even possible? __________________ 2013 SWP BRZ sportech. 11.11sec@129.01mph, 511whp on e70. FullBlown base kit, FullBlown built 9.5:1 engine, GTX3076R GEN2 turbo, 1700cc Bosch injectors, FullBlown flex fuel kit, FullBlown radiator and oil cooler, FullBlown custom 3" dual exit exhaust, act xtreme clutch, whiteline diff and subframe inserts, BC Racing coilovers, hotchkiss 18mm rear sway, is300 3.73 differential ... Never finished

11-02-2014, 04:17 PM	#21
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	Sounds like @Synack s car __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

11-02-2014, 07:47 PM	#24
Reaper in orbe terrum non visi Join Date: Jan 2014 Drives: violent Location: Mountains Posts: 1,747 Thanks: 279 Thanked 762 Times in 446 Posts Mentioned: 62 Post(s) Tagged: 1 Thread(s)	He's lower compression. That requires more airflow from an already undersized turbo (when twin scroll) __________________ I have E85 where there isn't E85, that's my secret. http://www.ft86club.com/forums/showt...t=reaper+build

11-02-2014, 03:19 PM	#16
Tiz Member Join Date: Nov 2012 Drives: Subaru BRZ Location: Europe Posts: 83 Thanks: 22 Thanked 18 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	@Dipstik Not another boxer but another FA20 @all It seems that a GTX2867R is simply not capable of reaching its hp rating on pump gas. A bigger turbo seems to be a better choice.

11-02-2014, 04:08 PM	#20
DRACHENV6 Senior Member Join Date: Apr 2011 Drives: tata nano Location: Boston Posts: 135 Thanks: 6 Thanked 27 Times in 14 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	can you post the dyno sheets?

11-02-2014, 04:28 PM	#22
Tiz Member Join Date: Nov 2012 Drives: Subaru BRZ Location: Europe Posts: 83 Thanks: 22 Thanked 18 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I do not have dyno sheets right now. Tuning is still work in process and I got only preliminary results so far. But I will post follow-up info asap.

11-03-2014, 11:24 AM	#25
Synack Boosted Join Date: Jul 2012 Drives: Sideways Location: Atlanta Georgia USA Posts: 2,377 Thanks: 388 Thanked 716 Times in 414 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	Yep lowered compression needs more boost to make the same power. Now with lowered compression it's going to be a lot safer, a little more lag, and have higher potential (if you want it). __________________ *Nismo 370Z 300whp -> FR-S Turbo 450whp on E85 -> Z06 Corvette 500whp*

11-20-2014, 04:07 PM	#26
Tiz Member Join Date: Nov 2012 Drives: Subaru BRZ Location: Europe Posts: 83 Thanks: 22 Thanked 18 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Update: My tuner found the missing power. Now the car makes approx. 410bhp and 500nm torque. More or less flat torque curve starting from 3300 rpm. BUT: The OEM AT transmission cannot handle so much torque. Does anyone know about an upgrade? I understand that SSP is developing something? Thanks.

11-21-2014, 01:36 AM	#28
Tiz Member Join Date: Nov 2012 Drives: Subaru BRZ Location: Europe Posts: 83 Thanks: 22 Thanked 18 Times in 16 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I believe the diameter of one of the pipes was too small -> resulting in back pressure and high intake temps.

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