Time for some boost! VSR Motorsports Single Turbo Kit

jwick

Standard or Twin Scroll?

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

MidnightBlueZ

Sorry it's JB so I guess standard? Vband setup

GaleForce

Congrats!

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MidnightBlueZ

My bad.. Mine is V-Band inlet .82 A/R with V-Band discharge

Looks like this.. Pictures are hard to find that just came up quick.

Attached Images

image.jpg (87.5 KB, 18 views)

jwick

Ah...not twin scroll. V-band connections on both ends is nice though

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

MidnightBlueZ

thanks, does make it easy to place or remove. Plus with the way their manifold is setup and location of the turbo I don't know if there'd be enough room for that size a flange?

jwick

Yeah...it does look like a pretty tight fit for that kit.

It also gives me an idea why the VSR and BP kit, running the same turbo, produce completely different power bands.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

MidnightBlueZ

Do you have a graph I can check out with your powerband? Wondering how much difference there is..

Boosted Performance

Although they are both 6266 turbos, they are drastically different when it comes to performance due to the turbine housing size.

The V-band turbine (.82 a/r) is significantly smaller in physical size, and flows a lot less than the T4 1.15 a/r. I would only ever suggest the (largest available) 1.32 a/r for built engines...why?:

When I performed flow tests on the BP 1.15 a/r turbine by measuring the EBP (exhaust back pressure...pressure in the exhaust before the turbine) I found that the 1.15 a/r turbine is optimal for up to 600whp (6-14 psi of boost on pump gas) on this engine. Pushing more than that is possible, but efficiency goes out the window. The VHR is extremely efficient, and moves a lot of air...so the larger turbine IMO is the only way to go.

Basically, you do not want the exhaust back pressure to exceed the manifold boost pressure by more than 2 fold. So, if you are at 12 psi of boost, the EBP should not exceed 24psi. The 1.15 a/r turbine was tested at around 18 psi of EBP when the manifold pressure was at around 11-12 psi.

What most people forget is that whatever comes out of the compressor side is sent to the combustion chamber, fuel is added, and the mixture is ignited. All this hot gas has only one way out, and that is through a turbine housing. If the turbine is small, the exhaust will not vacate the combustion chamber as efficiently, in tern not allowing fresh new air to enter. (Yes, some goes through the wastegate, but most has to go through the turbine).

This is why I am so excited about the all new PTE 6870 turbo. It has a larger compressor wheel, but more importantly a much larger turbine wheel (high flow capability). This turbo should be the number one choice for those that have their engines built, and really want to push things the extra mile.

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COSMO

sub'ed

COSMO

He has the uprev maf's btw and a built motor with 10.1 cp pistons..

jwick

I was only asking because all the VSR kits seem to make more HP at lower PSI levels but have lower torque numbers overall than the BP kits. Since it's the same turbo, although a different A/R ratio, I was trying to get a free education as to why that might be

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

COSMO

How did this thread become a debate between the 2 kits when the subject thread is vsr turbo kit? I have heard nothing but good things between both kits as well.. Congrats on getting your car up and going again thanks for the dyno numbers...

jwick

It's not a debate. Was just a simple question. Don't make it something it isn't man

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

MidnightBlueZ

It's all good fellas.. I find it interesting as well as very informative. Thanks for the knowledge Boosted Performance. Like you said each kit is different in several ways and all depends on what the customers wants and needs are.. At the end of the day if it makes you happy that's all that truly matters!

I can't say what the diameter of the charge pipes is off hand but I thought they were 2.75 but without measuring I can't be sure. I'm sure I can get that info from Bobby though. I like the BP kit for what it is and it's obviously proven. Few locals around me have the kit on G35s. I also love the kit I chose to go with which is also proven. One of the biggest things for me was I liked the appeal of a top mount single. It's nice to be able to pop the hood and show the goods. The mid mount and twins don't really allow that easily. VSRs kit fit my needs cause I didn't have the resources or time to DIY and didn't like the extra labor of dropping the engine with twins or not being able to see them. BP is great quality I just don't care for my turbo being underneath the car lol. At the end of the day we are all boosted brothers.

Thanks for following my progress and the support. I'm just glad that the Z is almost ready to come home better than ever! Now if only spring would get here quicker..