Twin scroll T3 manifold
Originally Posted by Ted B
I don't have the charts in front of me, but on straight 93 at ~22 psi, I made 397 whp on a Dyno Dynamics, which is ~456 whp on a Dynojet.
We activated the methanol and turned up the boost, but only got to ~25 psi before the clutch gave way. That worked out to 430 whp on the Dyno Dymanics, which is ~495 whp on a Dynojet.
I'll scan the charts later, which I should have done some time ago.
We activated the methanol and turned up the boost, but only got to ~25 psi before the clutch gave way. That worked out to 430 whp on the Dyno Dymanics, which is ~495 whp on a Dynojet.
I'll scan the charts later, which I should have done some time ago.
Ok, here are my dyno charts.
Don't pay any attention to the "2G DSM" descriptor in the window. That's just Noize's idea of a lame joke.
There are three sets of lines:
Lowest - Just getting things into whack with Shiv's reflash.
Middle - 93 octane and 22 psi
Highest - 93 + methanol and 25 psi before the clutch slipped too much to continue.
All things considered, the setup that Drifto put together is making around ~495 whp in Dynojet terms on 25 psi, and this was through the exhaust. We did not make a run (yet) with the ATP cutout open. The tubular manifold Drifto put together, coupled with the efficient 3" V-band downpipe and straight TBE exhaust is doing a great job!
Don't pay any attention to the "2G DSM" descriptor in the window. That's just Noize's idea of a lame joke.
There are three sets of lines:
Lowest - Just getting things into whack with Shiv's reflash.
Middle - 93 octane and 22 psi
Highest - 93 + methanol and 25 psi before the clutch slipped too much to continue.
All things considered, the setup that Drifto put together is making around ~495 whp in Dynojet terms on 25 psi, and this was through the exhaust. We did not make a run (yet) with the ATP cutout open. The tubular manifold Drifto put together, coupled with the efficient 3" V-band downpipe and straight TBE exhaust is doing a great job!
Originally Posted by Drifto
I've been waiting to see if Garrett would release an twin scroll turbine housing and they finally did so I decide to build a manifold to take advantage of it. I still have to figure out if I'm gonna run one or two wastegates, but for the most part it's finished. I'm using a GT3076 on this set up since it's my daily driver and I'm scared of big turbos.
Look in the "test mule" catagory. New manifold pics are the last ones.
http://mpfab.com/galleries.htm
Look in the "test mule" catagory. New manifold pics are the last ones. http://mpfab.com/galleries.htm
Would the "twin-scroll GT30" be the GT32 turbo? There are a few Subaru's out there running the GT32 setup. Now keeping in mind that there are many different turbine castings out there (some which may work better than others), in our experience because of the size limitations of the T3 turbine there really isn't a big advantage to going twin-scroll.
The GT30R turbine wheel inducer area is not that large relatively, so actually when you go with a twinscroll design you are in fact 1. Reducing "A" of A/R due to the additional turbine wall and 2. decreasing exhaust gas velocity by increasing pipe surface area (twin pipes)
Since the Subies are ultra laggy, we have experminted with the GT32R in hopes of increasing response / spool up but with the GT30R v GT32R results were not noticeable - in fact there was a power loss. Not sure how the results would be on the 4G63. Good luck!
Cheers,
Gary
Gruppe-S
The GT30R turbine wheel inducer area is not that large relatively, so actually when you go with a twinscroll design you are in fact 1. Reducing "A" of A/R due to the additional turbine wall and 2. decreasing exhaust gas velocity by increasing pipe surface area (twin pipes)
Since the Subies are ultra laggy, we have experminted with the GT32R in hopes of increasing response / spool up but with the GT30R v GT32R results were not noticeable - in fact there was a power loss. Not sure how the results would be on the 4G63. Good luck!
Cheers,
Gary
Gruppe-S
Originally Posted by Gruppe-S
Would the "twin-scroll GT30" be the GT32 turbo? There are a few Subaru's out there running the GT32 setup. Now keeping in mind that there are many different turbine castings out there (some which may work better than others), in our experience because of the size limitations of the T3 turbine there really isn't a big advantage to going twin-scroll.
The GT30R turbine wheel inducer area is not that large relatively, so actually when you go with a twinscroll design you are in fact 1. Reducing "A" of A/R due to the additional turbine wall and 2. decreasing exhaust gas velocity by increasing pipe surface area (twin pipes)
Since the Subies are ultra laggy, we have experminted with the GT32R in hopes of increasing response / spool up but with the GT30R v GT32R results were not noticeable - in fact there was a power loss. Not sure how the results would be on the 4G63. Good luck!
Cheers,
Gary
Gruppe-S
The GT30R turbine wheel inducer area is not that large relatively, so actually when you go with a twinscroll design you are in fact 1. Reducing "A" of A/R due to the additional turbine wall and 2. decreasing exhaust gas velocity by increasing pipe surface area (twin pipes)
Since the Subies are ultra laggy, we have experminted with the GT32R in hopes of increasing response / spool up but with the GT30R v GT32R results were not noticeable - in fact there was a power loss. Not sure how the results would be on the 4G63. Good luck!
Cheers,
Gary
Gruppe-S
Walker
Originally Posted by Drifto
Hopefully I will not lose power but If it doesn't work out I can easily remedy the situation. The a/r of this particular housing is a .78. The turbo is a 3076. Hopefully in 2weeks or so I'll know whether or not it's worth the trouble. I will keep you all informed.
Walker
Walker
Can't wait to see your dyno graphs!Gary
Gruppe-S
I've always wondered 'bout the twin-scroll gt4088r w/ the garrett .85 a/r housing vs gt4088r w/ the pte .68 or .78 undivided housing... people have mixed ideas about twin-scroll but no clear answers it seems... good luck on the testing, interested to see the results.
Originally Posted by ct9a gsr
I've always wondered 'bout the twin-scroll gt4088r w/ the garrett .85 a/r housing vs gt4088r w/ the pte .68 or .78 undivided housing... people have mixed ideas about twin-scroll but no clear answers it seems... good luck on the testing, interested to see the results.
Mainly there's little data because it's so expensive to do such testing. The GT4088R .85 I would say would be a suitable turbo for the 600whp range, we're actually building an STI which which will have twin scroll manifold, twin Tial 38mm WG, and a twin-scroll turbo. Should be done in 1-2 months. For the EVO I actually have in my possession a custom built 20G with the twin-scroll removed from the turbine side. It's been installed on the shop car un-tuned and I can say that the car did not lose any boost response or low end but has more top end. We will be doing dyno tuning on this setup next week, and depending on what the partners hopefully we will release the graphs. I'll keep everyone posted if I get the green light.
Cheers,
Gary
Gruppe-S
I think the advantage of the twin-scroll effect becomes more advantageous the bigger the turbo it's utualized on... so kinda hard to use the results from smaller turbos and think about applying the same effect on a bigger turbo.
Hmm... also seems like the people who do run gt4088r's (which are rare), usually always run the PTE housings... oh well, I'll just wait for results from others, lol.
Hmm... also seems like the people who do run gt4088r's (which are rare), usually always run the PTE housings... oh well, I'll just wait for results from others, lol.
Originally Posted by ct9a gsr
I think the advantage of the twin-scroll effect becomes more advantageous the bigger the turbo it's utualized on... so kinda hard to use the results from smaller turbos and think about applying the same effect on a bigger turbo.
Hmm... also seems like the people who do run gt4088r's (which are rare), usually always run the PTE housings... oh well, I'll just wait for results from others, lol.
Hmm... also seems like the people who do run gt4088r's (which are rare), usually always run the PTE housings... oh well, I'll just wait for results from others, lol.
Cheers,
Gary
Gruppe-S