Twin scroll T3 manifold
The 3065 is a 3082 with a FP hotside that has a funky circle shaped flange that is only found on FP/Buschurs manifold where as the 3082 has the regular garrett t3.
Clearing up more confusion i hope...
Scorke
Clearing up more confusion i hope...
Scorke
Which is readily realized for an engine with exhaust pulses coming only every 180 degrees of crank rotation.
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*edit*
I meant to say the 3065 and 3082 are basically the same, and the 3076 and HKS 3037 are basically the same.
Last edited by Frenchy4g63; Apr 24, 2007 at 05:12 PM.
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That statement is highly doubtful considering the knowledge, modelling, prototype capabilities and expertise required to actually design a wheel. The most likely scenario is that FP has found a wheel from some other application and applied it to the GT35R. This approach is the same used for the 67mm wheel that a lot of people now use.
I don't believe your statement is accurate. Why would you need to use a larger A/R to take advantage of the twin scroll? The basis for the twin scroll is to use a manifold design that more efficiently uses the exhaust energy to spool the turbo.
I don't believe your statement is accurate. Why would you need to use a larger A/R to take advantage of the twin scroll? The basis for the twin scroll is to use a manifold design that more efficiently uses the exhaust energy to spool the turbo.
As far as the sizing of the housings pertaining to a twin scroll housing. You'll have to do some research on your own. I was told when doing a twin scroll setup the turbine housings needs to be sized considerably larger compared to a single scroll setup. I didn't bother to ask why, as I didn't really care. I trusted the source, and didn't see a reason to find out the specifics.
If you find the answer, post it in this thread, as I am curious myself. Not enough to research it though and since there's going to be some new twin scroll kits for the Evo pretty soon here, it would be goon info to know.
*edit* Just read JKav's post (#118) which explains it more scientifically. From reading his post, he's obviously smarter than I am when it come's to the science behind the power. It does make sense though, and also backs up something else I was told. Along with the housing needed to be sized larger, using larger twin scroll housings doesn't effect the spool much compared to single scroll turbine housings.
Last edited by Frenchy4g63; Apr 24, 2007 at 06:40 PM.
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Check out post number 31 on page 3
Check out post number 49 on page 4
Now if YOUR discussion is different than the original author of the thread, then my apologies.
But I was asking the AUTHOR how the coating is working for him. Also if he has a reason why he chose that particular manufacturer.
Thanks in advance.
this is going to be a long post!! Twinscroll testing has been an area of focus for us and the results have been nothing short of incredible. One of the engineers who works here actually wrote his masters' thesis at ASU on the topic of twinscroll effects on a turbocharged B series honda using a gt4088R.
this man REALLY knows what hes talking about 
you would think he designs turbos for a living or something?? 
twinscroll T4 1.06 A/R GT35R -- http://www.full-race.com/catalog/pro...3f718fbcfc7f2b
that is a 1.06 A/R t3 twinscroll housing, vband outlet for a gt30R turbine wheel
the .95 will not work with the GT35R, it isnt possible to make this work.
Ted -- you are actually slightly incorrect. When thinking about twinscroll housings vs single scroll housings, the a/r must be sized entirely differently. what might traditionally be considered a "big housing" in the land of single scrolls might be wayyy too small for a twin scroll application... see below for more info
Our goals arent too different. My goal is to make a larger turbo spool like a smaller one, AND deliver more power than that larger turbo is normally capable of in a single scroll application (again, see below)
nothing is free. if putting a different compressor wheel on the front of a gt35R didnt change turbine efficiency, response or spool, there would be a lot more people building "hta" turbos... this is a long hard lesson i have learned many times over.
thank you sir 
i personally like the .78 housing. its a great housing for 30R turbines. Unfortunately, i think the 3082 is not that great of a turbo, and the .78 will probably not work all that well with that large of a compressor. The 3082 is capable of decent spool and good power numbers, but the throttle response and midrange are nothing to write home about. They are going to suffer due to the mismatch. Ive used that turbo in a few instances and have yet to be impressed like i have from 3071, 3076 and 3582.
im not sure what a 3065 is, but the HKS 3037 and Garrett GT3082 are not the same!
imo twinscroll setups should be looked at as if they are (2) seperate turbines. When you go to a larger housing on a properly designed twinscroll application, spool can sometimes not suffer at all. interesting test results: Honda 1.8L engine with GT40R, ported cyl head, full race intake/exh manifolds
- start with small housing made 700whp at 41 psi, stretches head studs due to excessive cyl pressure
- change to next larger housing, makes 700whp at 32 psi, identical spool. makes 792 at 41 psi, stretches head studs due to excessive cyl pressure
- change to next larger housing, and change cams. makes 700whp at 24 psi boost. spools only 150 rpm later. Turn boost up transmission explodes. Change trans, next tranny blows up. headstuds do not stretch.
- change back to 0.85 for comparison sake with the big cams made 630whp at 41psi, head studs stretch.
theres a lot more than meets the eye!
EDIT: if i dont post again until thurs, sorry but i have to go to the east coast for the nhra/d1gp event @ englishtown! hope to see some of you there
The ability of a twin scroll to utilize the pulsing, unsteady flow of the exhaust exiting the engine gives it a huge bump in "apparent" efficiency, and ultimately spools up the turbine that much sooner. Twinscrolls also isolate the cylinders' blowdown events much better than a non-divided housing, preventing the exhausting cylinder's very high PEAK exhaust manifold pressures from finding their way into the other cylinder on its overlap period.
you would think he designs turbos for a living or something?? I would love, love, love to use a twin scroll 35r, but there aren't any T3 housings large enough for it. I wanted to go twin scroll, so much so, that I had spec'd out a twin scroll 4088r, with a custom Full Race twin scroll manifold. In the end I've decided to wait until the FP HTA wheel is available to use it with a 3065r.
that is a 1.06 A/R t3 twinscroll housing, vband outlet for a gt30R turbine wheel
I'm thinking a HTA35R with a .85 a/r T4 housing would work really, really well. The HTA wheel and twin scroll design should help spool and mid range power, while the larger housing allowing all the peak power. Sticking with the 2.0, I'd like to take advantage of the high rpm capability, and dont want to have back pressure issues.
I think .78 is perfect for a gt3082r considering an fp3065 is a .70 and makes sick power. Looks like improved spool and greater top end than the fp unit on paper, however, FP's housing is internally mirrored after the new GT housings designed around the new GT wheels and this twin scroll is some sort of retro fit jobber.
- start with small housing made 700whp at 41 psi, stretches head studs due to excessive cyl pressure
- change to next larger housing, makes 700whp at 32 psi, identical spool. makes 792 at 41 psi, stretches head studs due to excessive cyl pressure
- change to next larger housing, and change cams. makes 700whp at 24 psi boost. spools only 150 rpm later. Turn boost up transmission explodes. Change trans, next tranny blows up. headstuds do not stretch.
- change back to 0.85 for comparison sake with the big cams made 630whp at 41psi, head studs stretch.
theres a lot more than meets the eye!
EDIT: if i dont post again until thurs, sorry but i have to go to the east coast for the nhra/d1gp event @ englishtown! hope to see some of you there
Last edited by Geoff Raicer; Apr 30, 2007 at 08:44 PM.
Ted -- you are actually slightly incorrect. When thinking about twinscroll housings vs single scroll housings, the a/r must be sized entirely differently. what might traditionally be considered a "big housing" in the land of single scrolls might be wayyy too small for a twin scroll application...
