Judging by that VD graph, twin scroll isn't needed. Ethanol fuel will pick up a lot everywhere, and likely shift boost threshold 200rpm lower still.

 

Sorry i Think you commenting both turbos. I'm totally agree with you with the tomei and the potential of modern stock frames. The Arms is quite obsolete and it spool very late with respect to the stock turbo. In any case it is quite representative since it is well know by the comunity. So the meaning of my post is that the g25 660 .92 is a little bit laggy than the arms but the rising of the boost is much more steep.

 

thank you. Unfortunatelly I need to change the injector before to further increese the boost on high rpms.

 

Add some more effective pressure/flow to them, by increasing the base fuel pressure to 50psi, that should bring your duty down a bit. I run 55psi base fuel pressure. I also need to upgrade mine, it is the only aspect of the built restricting me from running 3+bar of boost with a proper duty cycle margin as I am over 100% duty at 2.8bar.







Marios

 

This is a concrete possibility but before that I'have to understand how to "unlock" the full flowing potential of my deatschwerks 800cc injectors. On paper 800cc are more than enought for 500 hp but it is not so true for this injectors. Basically until 90% of duty cycle (linear response) they flowing like 650 cc. After that the flow increase up to the maximum 800cc value in a quadraticaly way. Usually injectors shows a plateau in flow around 90% of duty cycle....all but not this.
At the end of the story I use someting like 620 cc for injector size in ecuflash but it is possible to use the 100% of duty cycle with the engine that goes very rich with respect to the afr map. This is not dangerous for the engine but I need to modify the afr map in the right way to compensate this effect. For the moment 1.65 bar @8000 rpm is the limit to kept the DC below 90%.

 

There is nothing to understand my italian amico, not all injectors sets work in the same way, as far as spray patterns, flow vs pressure, atomization etc. If you have scaled in the injectors properly, latency and offset wise and you can control their puselwidth the right way, then all you are left with is how the specific injectors are made to work. No, not all injectors behave as you have described, as I said different sets and types of injectors from different companies, bare different characteristics in how they adjust their flow vs duty cycle in relation to fuel pressure. The specific injectors I am using for instance, flow more than they should as they are pushed towards their max duty cycle, and as the effective fuel pressure is increased-by increasing the base pressure.



I used to run at some point around 10-11 years back, an fp red with 800cc sard injectors, and on my then setup they were maxed out at 2.2-2.3bar on stock base fuel pressure, 44-45 psi.


I found it a bit odd, for you to max the 800cc injectors at the boost pressure you posted, 1.8bar and on the specific turbo, but I suspect it flows just a bit more (air being denser due to better aero / less work of the compressor) than an fp red on the same setup and boost. If there is not an adequate fuel pump/system setup on the right voltage, and when one is on lower than stock base fuel pressure, it is possible to max an injector out on lower boost. Not knowing your fuel system setup and base pressure, I suggested rasing it to 50psi in order to see how the injectors react and by how much your duty cycle drops.


You should add boost and adjust pulsewidth to suit the target afr you want to achieve. I see no reason why you cannot run the injectors past 90% of duty and not being able to control them to deliver the afr you want.


Now about running too rich afr, apart from not getting the most amount of energy out of your fuel vs air mixture, there is a downside to this as you could be washing the cylinders up to a certain degree.

I do not use the stock ecu right now, but I have used 1260cc injectors through ecuflash with no issues whatsoever.


* Make sure the injectors you use are in excellent condition and in proper working order, you can flow test them for static and dynamic flow and spray pattern to see if everything is ok with the specific set. I know deatchwerks makes quality injectors, but if the set is ok and everything else on the setup is ok, if you have used the right latency and offset values but the injectors are still giving you trouble for some reason, change them to something else.


There is more power in your setup, and I am sure you will figure things out.







Marios

 

I was in Sema yesterday, and the "desired" G30 will be released the next year, 2019....

 

^Are you still at SEMA by chance? I know a certain someone who is dying to get a picture of a certain product if so...

 

Did they have any information at all about them there? I think only releasing the G42 from the G-series range is really missing the target

 

Injectors are not typically recommended to be run beyond 90% duty cycle. The reason is two fold: 1-they need time to "rest" in order to cool and can actually overheat when run over 90% and 2-as discussed they enter the region of non linearity and start injecting fuel at a rate faster than lower 90% duty cycle. Most ECUs only have a direct scaling ratio # and cannot account for this non linear region (nor should they).

 

They Dont have any info on the stand, and i can imagine they will release on the Sema 2019... The most interested turbo exhibited is gtx gen2 3584.

 

And the other good news for us is: a company Turbo Zentrum located in Germany, release a turbine housing with size and dimensions simmilar to Tial vband housings, to fit the Borg Warner Efr 7163. And any turbo kit to Garrett vband, you can put a Efr turbo too....

 

Seems like this is pretty standard Garrett new product rollout order to me. The GTX's were first available in the 42/45 size IIRC.

 

I was referring to the new offerings in the BW EFR series...got any pics of those?

 

so a turbine housing to to adapt Efr turbos?

This has been out for awhile.

Borgwarner just released it's black series turbos
8474 / 9274 / 9280 ( although the names are misleading a bit..)

The 8474 looks the best out of them for the moment. You can really push it over the 8374.