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Brando
 
quattrorunner's Avatar
 
Join Date: May 2006
Location: Las vegas
Posts: 6,323
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V-band turbo inlet question

I’ve had this v-band hot side for about three years sitting on a shelf. Have not had a chance to get this apart and set next to each other till now.
I have a new to me set of b&b headers with heat and am going to install them but before I install them I wanted to see if this mod would be a worthwhile mod but I’m leaning away from it. It looks like my headers would need larger modifications in order to be able to use this hot side. It’s one thing to cut and weld this new flange on and another for it to actually fit and be worthwhile. The t3 flange is smaller/more compact and this v-band flange is two 2”-2”25” pipes next together best case. Looks like the headers would best be cut way back to past the wastegate merge in order to make it work correctly.
I just want some opinions wether I’m right and also wether it might be worth it. I won’t be welding this, I know my limits.




I guess I’d have to find a race shop with really good welding skills.
Obviously things are tight back there for a gt35r and any changes might make it worse! So this is why I’m actually leaning away from even attempting this.
Why would I want to do it? It’s cool looking. And it might make a smoother flowing exhaust flow into the turbo. It might actually make a difference to performance.
So.....
What do you think?

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Turbo powa!
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Last edited by quattrorunner; 01-14-2021 at 08:46 AM..
Old 01-14-2021, 06:47 AM
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The Garrett website is a wealth of info. You could buy a new turbine side housing with the correct outlet.

https://www.garrettmotion.com/racing-and-performance/performance-catalog/turbo/gtx3582r-gen-ii/

https://www.garrettmotion.com/wp-content/uploads/2018/05/GTX3582R_GEN_II_flange-diagram.pdf
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Old 01-14-2021, 08:10 AM
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Brando
 
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As a matter of clarity, my turbo has the t3 I just wanted to see if this v-band could work. It's on my turbo for these pics but has never been on this turbo before this picture.
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Turbo powa!
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Old 01-14-2021, 08:43 AM
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Assuming that your A/R is the same, then the only difference should be slightly faster spool (I am assuming that the new housing is twin scroll). If you are happy with how quickly your engine responds, then the only real benefit you will gain, is visual.
Old 01-14-2021, 09:32 AM
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Brando
 
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I probably wouldn’t know the difference in performance yet. I haven’t even had the new engine tuned before taking it off the road 2 years ago.
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Turbo powa!
1977 911s. it's cool
Old 01-14-2021, 09:53 AM
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In our experience: not worth it

When they announced that divided v-band, it looked and sounded like a godsend: a cast stainless collector, 2x round inlets sized very close to our secondary tubes.

In practice, it creates a lot of backpressure. A built EFI 3.3L with cams, headers, GT35R, 3in muffler, and huge billet intercooler should have made well over 400whp on low boost and 500whp, on high, but made only 388whp on 12psi and under 485whp on 18psi.

We'd rather use a divided T3 setup.
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Old 01-18-2021, 10:10 AM
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Brando
 
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Thanks Chris! You've described my setup sans the billit intercooler.

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Turbo powa!
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Old 01-18-2021, 11:30 AM
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