Need a guinea pig?? haha

And it's not me this time! I was the G and the first customer installed V1.5 pig.

haha touche! Oh how id love a bigger turbo (yes yes I know I have a stock block, but still)... mmmmhmmm booooooost. lol

BTW...I pulled the pos-cat O2 sensors last weekend and the idle is so much better. Cleaned up my AFR range a ton. I still have the lopey idle hiccup but even after that it dials the idle back in much better than before.

I pretty much found the same thing this past summer. Its not 100% but its much much better.

Oh man this is so tempting!! Can you please some dimensions when you get the turbo Sasha.

When I have the turbo here, this thread will be updated with comparison pictures.

Update...Finally got one of these turbos in my hands, and it looks fantastic.

Couple of pictures:

On the left, the new 6870 with the largest (1.32 a/r) turbine housing and on the right is the standard 6266 with the 1.15 a/r housing:

http://i137.photobucket.com/albums/q...psjcudbhyu.jpg

The business end:

http://i137.photobucket.com/albums/q...psb0zdcrkj.jpg

http://i137.photobucket.com/albums/q...ps0xklwgss.jpg


Now the important picture:

http://i137.photobucket.com/albums/q...ps3yirmtnt.jpg

On the left is the 6870, and on the right is a 1.32 a/r turbine for the 6266 turbo. As you can see the two are identical in diameter. This means that the larger 68mm turbo is going to be an option with this kit, without any fitment issues.

This turbo is rated to flow 110lbs of air per minute. That really opens up the 800+whp door with E85 fuel.

Another quick comparison...6870 T4 1.32 twin scroll vs 6870 .96 a/r tangential vs 6266 1.32 a/r T4 twin scroll housing:

http://i137.photobucket.com/albums/q...pseku6sf10.jpg


The .96 a/r housing (non twin scroll) is much more compact, and would work just as well with the V2 manifolds.

I am doing a complete install for a local customer in the next couple of weeks and will get a chance to really check how this looks on the car. Will update this thread at that point.

Awesome find but how many guys actually have built motors for such an application..? None the less at least the option is there... Can't wait to see mr sqeeze's setup but personally I would have gone with the 6466 (faster spool, more efficient)..

There are a lot of guys with built engines, they just don't brag about it. This engine is 6 years old now, and warranty periods are long gone for most, so built engines will become a lot more common.

As for efficiency, the 6266, 6466 and the 6766 will all work well and will get you the same HP across the board on pump gas (knock limiting). I have customers with all those turbos, as well as a couple with 7675 turbos. On pump gas, same tuner, same dyno there are all within 5hp. So in theory the 6266 would be the best fit, because it does have the lightest rotating assembly.

So, for stock block applications a BB 6266 with a T4 turbine 1.15 a/r turbo will be the most efficient, because most of the tuners are comfortable pushing these engines to no more than 550whp on pump gas. For E85 applications and stock block for up to 620whp, I would keep the 6266, but go with the 1.32 a/r housing. Of course, most tuners will be hesitant to push the stock block to that power level.

I should also mention that I would not hesitate for a second in putting this new 6870 on a stock block with a 1.0 a/r turbine housing. THAT, would also be a very efficient set-up, especially where these engines like to operate...in the higher RPM range. Spool difference would be negligible, and exhaust back pressure would be very low, which means very high efficiency.

They key to all these turbos on a VHR engine is turbine housing. Based on all the testing I have done, a T4 housing is optimal. A lot of guys are concerned about spool, when really, flow should be the primary factor when choosing a turbo (turbine).

:icon18:

I see what you did there.

:bowrofl:

Sasha is it an optical delusion in the 2nd and 3rd picture cause the 6870 compressor flange appears to be slightly larger than the one on the 6266. Are they both standard twin scroll T4 flanges?

fixed :tiphat:

Optics....they are the same.

Figured they were but just checking. It is Friday afternoon and all and I'm definitely due an adult beverage:tup:

So.....who's going to be the one that takes the plunge and drop the 6870 into their build???:stirthepot: