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Old 01-17-2021, 05:32 PM   #26
KillerBMotorsport
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Definitely a bigger turbine housing. If you do go with cams and supporting head mods, then the biggest housing and 8-8,500 redline :P

Should make quite a bit more power, as you'll drop backpressure with a bigger housing and you're only at 31psi.
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Old 01-21-2021, 07:02 PM   #27
PotatoFlakeSTi
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Quote:
Originally Posted by KillerBMotorsport View Post
Definitely a bigger turbine housing. If you do go with cams and supporting head mods, then the biggest housing and 8-8,500 redline :P

Should make quite a bit more power, as you'll drop backpressure with a bigger housing and you're only at 31psi.
Went with some cams and very mild bowl porting, will see how she does then maybe move to a bigger turbine housing!
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Old 01-21-2021, 07:03 PM   #28
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Originally Posted by unlimitedshrimps View Post
What a gorgeous build... haven't seen that front bumper. Is it custom? Over the shelf?

Incredible work
That's the OEM '11-'14 STi/WRX bumper with a bit of 'snip'snip'.
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Old 01-21-2021, 09:01 PM   #29
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You’ll want the bigger housing. Just wait ***128520;
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Old 01-21-2021, 10:15 PM   #30
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If you are going for retune after head mods I'd also second getting bigger rear housing so you don't pay for tuning twice. I went from .86 to 1.03 and what an amazing difference, lower back pressure, better drivability everywhere and no roll over at high rpm with only 150rpm spool loss.
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Old 01-22-2021, 07:14 AM   #31
KillerBMotorsport
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I have to reiterate what others are saying here. If you've got dyno/tuning resources at your disposal, absolutely, play/learn all you want, You WILL want the bigger housing as your manifold backpressure will be through the roof, you'll keep upping the boost, and the returns will be poor at best.

With this size turbo, the small housing shouldn't even be offered IMO, unless your running twin turbos on a V8 with a 8psi target. Middle housing for street/track use on 93. Large housing for good fuel (C or E) with street use, and for track use regardless of fuel type. This is what will net you the best peak power as well as the most area under the curve, especially with an engine that's built for flow (RPM) use.
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Old 01-27-2021, 07:25 PM   #32
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Quote:
Originally Posted by KillerBMotorsport View Post
Definitely a bigger turbine housing. If you do go with cams and supporting head mods, then the biggest housing and 8-8,500 redline :P

Should make quite a bit more power, as you'll drop backpressure with a bigger housing and you're only at 31psi.
Quote:
Originally Posted by silversurfer05 View Post
You’ll want the bigger housing. Just wait ***128520;
Quote:
Originally Posted by CEEBEE View Post
If you are going for retune after head mods I'd also second getting bigger rear housing so you don't pay for tuning twice. I went from .86 to 1.03 and what an amazing difference, lower back pressure, better drivability everywhere and no roll over at high rpm with only 150rpm spool loss.
Quote:
Originally Posted by KillerBMotorsport View Post
I have to reiterate what others are saying here. If you've got dyno/tuning resources at your disposal, absolutely, play/learn all you want, You WILL want the bigger housing as your manifold backpressure will be through the roof, you'll keep upping the boost, and the returns will be poor at best.

With this size turbo, the small housing shouldn't even be offered IMO, unless your running twin turbos on a V8 with a 8psi target. Middle housing for street/track use on 93. Large housing for good fuel (C or E) with street use, and for track use regardless of fuel type. This is what will net you the best peak power as well as the most area under the curve, especially with an engine that's built for flow (RPM) use.

Thanks for the input - I'm looking into buying the .83AR turbine housing.
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Old 01-28-2021, 02:44 AM   #33
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Originally Posted by PotatoFlakeSTi View Post
Thanks for the input - I'm looking into buying the .83AR turbine housing.
WE DID IT GUYS!!!! Jp

Yeah as others said it will save you from having to go back to the Dyno and retune all over again etc.
I’m excited to see your final results. I predict it will be a monster and still have outstanding spool
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Old 01-28-2021, 03:34 PM   #34
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Definitely do the .93 or higher. I just had mine dynoed at 638WHP at 28psi on the G30-900 .83(at basically sea level in FL). I can list the build, but may start another thread under the proven power bragging. However I have GSC S2 cams, GSC Valves and valvetrain and a process west intake manifold. Tuner tried to make it more linear, but definitely being chocked out and wasnt able to capitalize on those mods as much. I think in the future I am going to change the housing or maybe do the G35. Hope this helps in you decide.



-Alex
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Old 01-28-2021, 07:51 PM   #35
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Originally Posted by bigAle06 View Post
Definitely do the .93 or higher. I just had mine dynoed at 638WHP at 28psi on the G30-900 .83(at basically sea level in FL). I can list the build, but may start another thread under the proven power bragging. However I have GSC S2 cams, GSC Valves and valvetrain and a process west intake manifold. Tuner tried to make it more linear, but definitely being chocked out and wasnt able to capitalize on those mods as much. I think in the future I am going to change the housing or maybe do the G35. Hope this helps in you decide.



-Alex
Thanks for your graph Alex. I've been scared away from any of the intake manifolds after seeing losses of 500-1000rpm of spool in return for 25-50 peak whp.

I've purchased the 0.83AR Housing.

I've got GSC S2 cams and Beehive Springs going in, mild bowl porting, along with a 12mm oil pump, and a CSF 'Racing Radiator' w/ some 1.5bar caps.
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Old 01-28-2021, 08:10 PM   #36
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Also have some fun stuff going in a different car... but that's for another forum





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Old 01-29-2021, 07:25 PM   #37
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Originally Posted by PotatoFlakeSTi View Post
Also have some fun stuff going in a different car... but that's for another forum




Let us hear it asap omg. McLaren makes some beautiful cars
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Old 02-01-2021, 08:02 PM   #38
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Let us hear it asap omg. McLaren makes some beautiful cars
Hopefully tomorrow - with a 'Stage 2' 91/93/100oct tune
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Old 02-06-2021, 09:35 AM   #39
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@PotatoFlakeSti keen to see the results. Iv recently purchased the G30-900 with a 0.61AR but seeing so many mixed reviews. Car is an 02 STI EJ207 with Kelford 272 cams.

Your power at 31psi is impressive.
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Old 02-06-2021, 10:34 AM   #40
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Originally Posted by PotatoFlakeSTi View Post
Also have some fun stuff going in a different car... but that's for another forum





I don’t know if I’ll ever get over my fast and furious complex and stop idiotically modding Japanese econoboxes
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Old 02-07-2021, 12:45 AM   #41
silversurfer05
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Originally Posted by Lee_WRX01 View Post
@PotatoFlakeSti keen to see the results. Iv recently purchased the G30-900 with a 0.61AR but seeing so many mixed reviews. Car is an 02 STI EJ207 with Kelford 272 cams.

Your power at 31psi is impressive.
Id you primarily are racing it. The .83 is what ypu want. You have a factory redline of 8,200 rpm. Use it lol
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Old 02-07-2021, 04:00 PM   #42
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Originally Posted by Lee_WRX01 View Post
@PotatoFlakeSti keen to see the results. Iv recently purchased the G30-900 with a 0.61AR but seeing so many mixed reviews. Car is an 02 STI EJ207 with Kelford 272 cams.

Your power at 31psi is impressive.
You should be going .83 or 1.01 on a 2.0L for sure.
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Old 02-07-2021, 04:19 PM   #43
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I don’t know if I’ll ever get over my fast and furious complex and stop idiotically modding Japanese econoboxes
I'll admit I have the same complex - Can't wait until the Evo 6.5 is legal here.
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Old 02-14-2021, 11:17 AM   #44
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that’s awesome
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Old 03-16-2021, 05:44 PM   #45
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Engine is going back in - unfortunately I've not received my .83AR Turbine Housing I ordered almost 2 months ago... So I'm sticking with the small boi for now.
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Old 03-25-2021, 04:37 PM   #46
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Looking like approximately 670whp - should have a dynosheet later today... Curious to see the graph.
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Old 03-25-2021, 05:37 PM   #47
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Losing a little fuel pressure up top, evidently we're maxing out the Brushless DW pump(on the oem voltage)

Not much loss in spool.

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Old 03-26-2021, 08:16 AM   #48
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Originally Posted by PotatoFlakeSTi View Post
Dyno Chart
Did this end up being the .61 vs. .83 AR turbine housing?
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Old 03-26-2021, 10:30 AM   #49
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Did this end up being the .61 vs. .83 AR turbine housing?
No, it's still on the .61ar housing. Difference is mild bowl port, GSC S2 cams, GSC Beehive valvesprings, Inconel exhaust valves... And ofcourse ARP 625+ headstuds.
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Old 03-26-2021, 04:34 PM   #50
silversurfer05
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No, it's still on the .61ar housing. Difference is mild bowl port, GSC S2 cams, GSC Beehive valvesprings, Inconel exhaust valves... And ofcourse ARP 625+ headstuds.
Great gains. 50+ hp/tq everywhere after full boost. Prob another 20-30 with the housing upgrade too
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