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Old 03-26-2009, 11:03 AM   #1
Brandon@TXS
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Default Singlescroll Gt30 vs. Twinscroll Gt35 Results Inside

Fresh off the dyno from last night. I built this twinscroll kit for a customer of ours that uses the car on the road course. He wanted the response of his old Gt30 with a little bit more power. I think we met those requirements! This is not exactly an apples to apples comparison as we did use one of my prototype intake manifolds on the Gt35 setup, but I think it shows even more in favor of the twinscroll setup because the manifold should in theory make it spool slower. The Gt30 used a T3 .82 A/R hotside and the Gt35 is using a T4 twinscroll .84 A/R hotside. Take a look at that power all the way to 8K rpm!!



Brandon
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Old 03-26-2009, 11:05 AM   #2
TAPOUT
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That's most excellent....Race gas I take it?
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Old 03-26-2009, 11:08 AM   #3
blowbyu24
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wow spool was almost the same.....very nice results!
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Old 03-26-2009, 11:09 AM   #4
Token-Negro
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You sure that was a T4 .84 twin scroll? Who made the turbo?
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Old 03-26-2009, 11:19 AM   #5
Brandon@TXS
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I placed the order for the turbo from FP myself. Fuel was VP C16.
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Old 03-26-2009, 12:18 PM   #6
seanathanq83
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wow 35 spooled faster, sweet
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Old 03-26-2009, 01:48 PM   #7
sponaugle
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Very cool, but the 30R spool seem pretty late in the first place? You didn't mention cams, so that could be the key variable.

Just for comparison, look at my torque with the 30R .82:

\

Your 30R crosses 300 lb-ft at 4500rpm, while this .82 does it at 3800rpm. This is a stock 08 head, built bottom end setup, nothing special. This is however using meth+pump, but I was more interested in the spool area then the peak. What hold and run time were you using?

None the less, that 35R spoolup looks very nice, and the upper end power is very very nice. I like it!
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Old 03-26-2009, 02:11 PM   #8
Brandon@TXS
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You're right, the 30 was a bit lazy. I did forget to mention that the car has Cosworth heads/cams but they were on it for both the 30 and 35. We used a 4 second hold, 16 second ramp time. I am really impressed with the way this car makes power at RPM. I believe that this may be the final design for our intake manifold. With all the Subarus that have been on our dyno, I have never seen one make peak power past 7K!

Brandon
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Old 03-26-2009, 03:41 PM   #9
sponaugle
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Quote:
Originally Posted by Brandon@TXS View Post
You're right, the 30 was a bit lazy. I did forget to mention that the car has Cosworth heads/cams but they were on it for both the 30 and 35. We used a 4 second hold, 16 second ramp time. I am really impressed with the way this car makes power at RPM. I believe that this may be the final design for our intake manifold. With all the Subarus that have been on our dyno, I have never seen one make peak power past 7K!

Brandon
Indeed that is some very good high end flow. I usually see hp falling pretty good above 7500, so you have a good matched setup.

The spoolup difference with the 30R might be something related to the AVCS and the cosworth cams.

Very cool stuff.

Jeff
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Old 03-26-2009, 07:07 PM   #10
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Quote:
Originally Posted by sponaugle View Post
This is a stock 08 head, built bottom end setup...
Considering this was a customers car, i highly doubt it was an 08, which, correct me if i'm wrong, has dual avcs which GREATLY affects spool characteristics of a given turbocharger.

Plus, dynapack graphs always look lazy They just don't load the car down like a mustang i'm guessing.

I for one am quite impressed with the results, as the 35r made more power EVERYWHERE on the graph. New manifold or not, those are some pretty impressive results.
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Old 03-26-2009, 08:25 PM   #11
sponaugle
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Quote:
Originally Posted by wrxhard View Post
Considering this was a customers car, i highly doubt it was an 08, which, correct me if i'm wrong, has dual avcs which GREATLY affects spool characteristics of a given turbocharger.

Plus, dynapack graphs always look lazy They just don't load the car down like a mustang i'm guessing.

I for one am quite impressed with the results, as the 35r made more power EVERYWHERE on the graph. New manifold or not, those are some pretty impressive results.
While the 08's Exhaust AVCS does help out a bit, I suspect that 30R tune had something setup unusual with it's own Intake AVCS. I had a Dynapak and indeed the loading mechnism sucks as it waits for torque to be applied to start resisting. None the less, the twin scroll setup is nice. 35R is such a nice turbo.

Jeff
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Old 03-26-2009, 11:47 PM   #12
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Something is way wrong with the 30r max torque at 5100rpm???? lol no way...
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Old 03-26-2009, 11:56 PM   #13
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pics....
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Old 03-26-2009, 11:56 PM   #14
Brandon@TXS
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I will agree with Jeff in regards to the AVCS not being optimized for the Gt30 setup, but we didn't make any changes to the AVCS settings for the Gt35. I think both setups had a bit more in them, but it is what it is.

Brandon
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Old 03-27-2009, 09:46 AM   #15
MXJS
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Is this going to become a production turbo kit?
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Old 03-27-2009, 10:24 AM   #16
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It's not out of the realm of possibilities!
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Old 03-27-2009, 10:29 AM   #17
D Money
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Wait, that's flywheel hp ratings?

I saw this car in person when some guy drove it over to Andrewtech. Sounds mean.
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Old 03-27-2009, 10:34 AM   #18
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Quote:
Originally Posted by D Money View Post
Wait, that's flywheel hp ratings?

I saw this car in person when some guy drove it over to Andrewtech. Sounds mean.
no they are wheel hp.

Paul
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Old 03-27-2009, 11:52 AM   #19
MXJS
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Quote:
Originally Posted by Brandon@TXS View Post
It's not out of the realm of possibilities!
I am running the TXS singlescroll kit right now and i love it, especially for how much it costs and the ability to buy it without a turbo. If you do produce it and price it competitively like you do with the singlescroll, i will be ordering one!
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Old 03-28-2009, 12:53 AM   #20
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ya any pictures of the kit too =D?
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Old 03-28-2009, 02:01 AM   #21
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Great stuff, thanks for posting this.
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