Twin Scroll Vs Single

[Rolls]

Doesn't look like a huge improvement spool wise, down on power as well?

[wolverine]

Without back to backing with an open 0.82 housing it is hard to tell.

On the road it drives nicely, it makes boost much earlier on the road than the dyno. I am not sure it is down on power. It is +/-10kw to most other results (excluding the outlying results from special dyno's)

Yavus felt there was an exhaust restriction based on the rate of climb and the taper at the top end. I am not so sure, it could be the old external gate (pretty sure it runs a 7-8psi spring) it could be the turbine housing maxing out. A 1 bar spring would make life easier for the boost controller. Anyone know where to get one for an old school HKS gate?

Ultimately it makes power around where it should, 200rwkw at 4100rpm isn't shabby on this dyno. I can reinstall the de-cat but 10kw or so extra top end is useless to me (assuming it is even an issue).

We could have played silly buggers and brought it all on much earlier for dick schwinging reasons but this is consistent with other Unigroup sheets.

[JonnoHR31]

the atp housing would probably be becoming a decent restriction at that power level, hence the top end. you could probably squeeze a decent amount more out of it with big boost though.

i have the same gate and found a mob that manafacturers copies and springs to suit a while ago but lost all the details when my hard drive died unfortunately. they are out there though, just gotta find them.

[wolverine]

Thanks Jonno, I looked up Ebay and Vulture seem to have the springs.

There is a spring manufacturer near my work that can make one to suit I hear via the grapevine as an alternative but I need to run that down next week.

[GTR_JOEY]

Without back to backing with an open 0.82 housing it is hard to tell.

On the road it drives nicely, it makes boost much earlier on the road than the dyno. I am not sure it is down on power. It is +/-10kw to most other results (excluding the outlying results from special dyno's)

Yavus felt there was an exhaust restriction based on the rate of climb and the taper at the top end. I am not so sure, it could be the old external gate (pretty sure it runs a 7-8psi spring) it could be the turbine housing maxing out. A 1 bar spring would make life easier for the boost controller. Anyone know where to get one for an old school HKS gate?

Ultimately it makes power around where it should, 200rwkw at 4100rpm isn't shabby on this dyno. I can reinstall the de-cat but 10kw or so extra top end is useless to me (assuming it is even an issue).

We could have played silly buggers and brought it all on much earlier for dick schwinging reasons but this is consistent with other Unigroup sheets.

Any update on this mate?

did u sort out a new spring/exhaust restrictions and been back for a new reading?

[hypergear]

Should make a different assume the split is from the manifold to the wheel tip of the turbo. It also makes the a/r slightly smaller then what it is depending on the thickness of the divider.

[Full-Race Geoff]

the divider is *not* used for the calculation of A/R by any turbo mfg

[JonnoHR31]

yer the a/r stays the same but the with the same a/r housing in both open and divided the divided will lose a small amount of gas area due to the divider, but this is more than made up for by the increased efficiency of the divided pulses

[zebra]

the divider is *not* used for the calculation of A/R by any turbo mfg

Thank Christ someone knows what is what:)

[wolverine]

Any update on this mate?

did u sort out a new spring/exhaust restrictions and been back for a new reading?

Sorry, I missed your post. No updates, just driving and enjoying it.

[GTR_JOEY]

Fair enough

[Lithium]

Well after years of having sub-standard options for going twin scroll on Garrett turbos we can now get genuine Garrett VBand Housings in open or twin scroll... will be interesting to see how these perform!

[34GeeTeeTee]

V-band TS looks like this -

[Lithium]

Dafarq. I was half expecting to see a fleshlight when the email notification came through

[34GeeTeeTee]

Dafarq. I was half expecting to see a fleshlight when the email notification came through

Hahahaha yeah it was a bit random but the inlet looks like a piggy!

They should be a good thing though hopefully!

[bigmikespec]

Well after years of having sub-standard options for going twin scroll on Garrett turbos we can now get genuine Garrett VBand Housings in open or twin scroll... will be interesting to see how these perform!

Garrett Divided.jpg

Ahhh nice find Lithmeister! Where did you find this gem?... they had their rapid prototyped stuff at SEMA a while back, looks like they have come through with goods.

[Lithium]

I'm well connected, and always have my ear to the ground.

(aka, I follow Turbo By Garrett on Facebook and they posted an update which I spotted while slacking off )

https://www.facebook.com/photo.php?fbid=10152761602720103&set=a.10150407102375103.644054.46944410102&type=1&theater

[AngryRB]

So are these better than the APT ones, cause the one i bought from ATP has Garrett logo but in smaller print than above pic...

[34GeeTeeTee]

I'm well connected, and always have my ear to the ground.

(aka, I follow Turbo By Garrett on Facebook and they posted an update which I spotted while slacking off )

https://www.facebook.com/photo.php?fbid=10152761602720103&set=a.10150407102375103.644054.46944410102&type=1&theater

Liked!

[SimonR32]

Just made the FP HTA GT35R's look very tasty. Pitty I'm not going to buy a new manifold and turbo just to test

Edited April 23, 2013 by SimonR32