Originally Posted by MidnightBlueZ (Post 3082978)

Got some numbers tonight, car did really well! Issues were finally resolved but we did have one minor setback. The wastegate spring was maxed out at 14psi so with that said on E85 and a conservative tune it made 603rwhp 503wtrq with a peak of 545ish! Trying to get the vid from Bobby, however, it is posted on their Facebook page. I took a screenshot of the graph for now. We are going to switch out the spring next week ago go for 700+ as long as we can anchor the rear end down. My tires suck for this kind of power and the car is on stock suspension. There's a chance it could've put down more if the tires didn't light up the dyno. But I'm relieved and estatic with the current results. The curve is very nice.. and I'm told it is running solid! Bobby might throw on some slicks from another car for another pass with the stiffer spring to see what happens. That's all I really have at the moment but I'll be sure to share more as it comes.

Thanks

Originally Posted by jwick (Post 3082987)

Nice...What turbo comes with that kit?

Originally Posted by MidnightBlueZ (Post 3082992)

Precision 6266

Originally Posted by jwick (Post 3082993)

Standard or Twin Scroll?

Originally Posted by MidnightBlueZ (Post 3083004)

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

Originally Posted by MidnightBlueZ (Post 3083009)

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.

Originally Posted by jwick (Post 3083012)

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

Originally Posted by MidnightBlueZ (Post 3083016)

:tiphat: 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?

Originally Posted by jwick (Post 3083019)

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.

Originally Posted by jwick (Post 3083019)

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.

Originally Posted by Boosted Performance (Post 3083590)

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.

Originally Posted by jwick (Post 3083598)

Alright. So I'll pose a question. My dose the smaller turbine a/r produce more HP at a lower psi? Likewise why does the smaller turbine produce less low end torque?

Guess that was two questions