cdaiscool

I've looked around, and can't find anything that really answers my question well. Hoping H-T can help me out some.

I'm trying to work out a turbo setup. Setup currently:

-t3 ramhorn manifold
-Walbro 450 in-tank feeding Bosch 044
-8AN lines to fuel rail
-ID2000 injectors
-t3/t04s w/ stage 3 wheel
-Mikeyspec engine built to handle more or less anything we throw at it
-Mikey is also the tuner - 688 whp out of current setup.

Mikey's recommending the 6766 turbo as my final turbo. I'm trying to find out where it is in comparison to the 6466 gen 2. Dyno graphs make it look like it spools sooner, makes similar power on similar boost. Mikey's saying it'll have a bit more lag, but longer legs over the 6466.

Has anyone done a back-to-back of *****-to-the-wall dyno of these turbos? I'm fine with adding another set of injectors such as ID1000 on a secondary fuel rail (I have a Skunk2 Ultra Race manifold) and can add it in fairly easily if it turns out this is what I need to do to maximize the performance out of either of the turbos.

If I go with a 6766, should I go with a twin scroll t4 manifold? Will I see a big gain over the ramhorn I currently have? Either in lag reduction or more power? Will a 6766 t3 make similar power to a 6766 t4 twin scroll?

If these have been answered, I apologize. 2 days of Googling hasn't shown me much.

kr3w108

Maybe this will help....

https://honda-tech.com/drag-racing-3...nside-3042214/

cdaiscool

i saw that, but this line makes me wonder how much more capable the 6766 is capable of.

"Now look at this next dyno on Reid's car, (This is a 100,000 mile completely stock never opened supra motor) the 64 out spooled the 67 and made more HP showing that when inits efficiency range it outperforms the 6766, not until we went all in like on the 3.4 motor did the 67 make more HP"

The 1st graph they state it's all in and it seems to make around the same power. So either something is contradictory or they're referring to further in the rpm band it makes more power but that's it.

That's explicitly why I asked about all in vs all in.

kr3w108

What is your power goal? That should help answer your question. If you at not going for 900 plus then i would suggest the 64 over the 67.

The 6466 is a bad *** unit none the less. One thing that is obvious,the spool time is much better on the 64 vs the 67. As far as peak power the 6766 will get it everytime. 6466 is ball bearing , 6766 is journal.

The "all in" tests were at around 42 or so psi and tapering down, where the stock motor was tested at 36 psi.

Built motor graph shows the 6466 having better spool but peaking at the same RPM as the 6766. The 6766 was able to carry out the power further where as the 6466 lost steam.

The stock motor graph shows a different story where as both turbos show a similar spool and both carry out the power nice. One thing to note is the 6766 droped in psi towards the end of the run , not sure what the cause of that was but the results were not accurate do to that fact.

You can deff see where each turbos efficiency ranges are. Results will vary with different motors and setups as shown in the graphs.

cdaiscool

I don't realistically have a power goal. I'm just looking to build a setup on 'kill' that I can take to 1/4-mile events, half-mile events, etc and put a hurting out there. The engine should be able to handle whatever power I can realistically throw at it - not looking for a 1500 hp setup, but 900-1000 isn't out of the realm. Not building this to be a class/bracket/SFWD/Outlaw type car. Just something I can take to the track and put a hurting on V8s. And to further myself as an individual both with track time and mechanical skill.

I also do like to street drive the car, to events, shows, weekend gatherings, what have you. So reliability is important as well.

I was considering the 6870 gen 2 for a while, but the price, the fact I'd need a new manifold (I have a t3 open scroll right now, would need a t4 twin most likely), in addition to charge piping, the trans work I'm ultimately gonna need, etc makes it a tougher pill to swallow.

I can get a 6766 DBB for $1500 from a friend, or a new 6466 gen 2 for $1800 from Real St. and both are t3 manifolds.

I do feel that "air under the graph" tends to win races and therefore prefer air over peak. I'm not looking for a dyno queen, I'm looking for a track winner.

kr3w108

I still feel the 6466 being the better turbo for you. But if you feel that you will need more than what the 6466 can offer i would either go with the 6766 or the 6870. The 6870 is a way better turbo than the 6766 but the price is not very friendly.

you can use a bigger t3 housing that is open and it still be just as good as having a divided.

cdaiscool

I just saw they're doing a 1.05 open t3 6870 gen 2 turbo. Depending on its price point, it may be the best option. I'm fine with a bit over $2k play fee, but much past that starts making me cringe a tid bit more.

EDIT: asking Precision if its legit, but here's where I heard that: http://www.evolutionm.net/forums/evo...-opinions.html I'll update this once they confirm or deny.

I'll have a chat with the tuner instead of over e-mail when I'm ready to purchase soon as I've got a few extra bucks when people start paying me owed cash, and make a final decision.

Thanks for this!

cdaiscool

Precision confirmed a t3 6870 gen 2 is coming. Message over FB says they expect it to drop around late June.

kr3w108

Nice!