Ah yes, the EFR 7670 twinscroll looks like a nice setup in the .92 or 1.05 A/R combo and the 650 crank HP'ish rating is where I think the spool will still be in the mid to upper 3k range at 20 psi, maybe better.

Just checking out that setup now, looks really promising! For the 2011 One Lap event I'll have to stick with being able to run 91 or 93 octane for transits and will attempt to get 100 unleaded mixxed in for the events but can't assume it will always be available. A full E85 fuel system with Fuel surge tank is in the works with STM and I plan on being able to run that for drag racing events and high boost. It does seem like the twinscroll setups will have the edge for what I want the turbo to do, I guess we shall see.

I'll definitely see what you are up and give you a shout over the next couple days. Your Full Race twin scroll manifold is holding up great!

 

So my ts .78 on the 3071 is like a ss .47?!?
That's could be why I'm getting surge and power flats out at 6k?

 

Again. I am liking the searching...

Yes the .78ar ts t3 housing would be restrictive to top end power. Make a new thread with your setup and ailments. I am sure someone can help you figure it out.

 

The graph below is from my IX with the GTX3076R.

I first ran the T31 4-bolt 0.82 a/r with RevHard cast Manifold (gold line)

I then swapped to the T31 4-bolt 0.63 a/r with RevHard cast manifold and retuned (blue line)

I then swapped to the T4 TwinScroll 1.06 a/r and did not touch the tune. Manifold was my custom made short runner TwinScroll design with dual Tial 38mm's. (green line)

I made slightly overall more power with the 1.06 a/r TS vs. the 0.82 a/r and gained 900rpm in spool.

 

Thanks!
Do you think it's worth changing the flange to a T4 on a GT3071, or it's the same if I turn to a T3 divided 1.06?

 

Forget trying to change the flange to a T4. This is impractical.

First of all, I would consider a better turbo. A GT3071 does not produce good power for its rate of spool. An HTA3076 or GTX3076 outspools and outperforms a GT3071.

A 1.06 TS T3 is what you need. Drifto is using this, and it supports 600whp with his HTA3076 and E85:

HTA 3076 - 1.06 TS T3 - E85

If one cannot get 600whp out of a 1.06 T3 TS, the turbine housing is not the problem.

 

Thanks for replying Ted!
Intended use is AutoX, that's why I choose the 3071, because it's very important for me to have full boost, 2.0l engine, around 35oo rpm not later, and I've always been told that the 3076 is laggier than mine.

About the T4 flange, I thought to cut my current T3 divided flange on my ts manifold and weld a T4 flange, if the T4 1.06 ts was a better turbine housing for the 71, but I'm happy to hear is not necessary to turn to it!

 

We are not talking about the same thing. A 3076R is laggier than your 3071R, but not by much. An HTA3076 or GTX3076 spools as fast (or faster), and makes much more power. In my opinion, the 3071R does not give very good power for the time required to spool it.

Something to consider.

 

Ah, I always thought the GTX wheels to give more flow but to be laggier than the corresponding GT...
so GTX 3076 lower max boost rpm than GT3071, and GT3071 lower max boost rpm than GT3076?

 

I cannot confirm that, but I can confirm that an HTA3076 clearly outspools a 3076R, and is good for 600whp.

 

Ok, thanks Ted!

 

Here's my dyno plot



T4 1.00 A/R precision 6265 (will be going to the 66 upgrade next year)

Red Is the baseline
Blue Is as far as we could get before a Walbro started acting up.
Green Is where we left off.

 

is it with a stock 2.0? or 2.3?

when full boost? thanks guys!

 

Had some unrelated drivetrain issues that took the car off the road for a whole so I can't remember when i achieve full spool as I'm breaking the transmission and clutch in but its a 2.4

 

one question guys.

Stock block evo 9
Supporting mod ic,pump,injector,exhaust,t4 twinscorll manifold ecc.



6262 t4 twinscroll 0.84 a/r or 6266 twinscroll t4 1.00 a/r?

will a 6262 vband singlescroll 0.82 spool faster than a 6266 twinscroll t4 1.00 a/r?



No matter about other turbo like bw or garret.. is a simple question about this configuration.


Thanks a lot

target 450 whp and not a super laggy spool, will 0.84 twinscroll 6262 fall hp at high rpm?