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[GMR-PERFORMANCE]

I run a fuel transducer on my dyno and have logged many hours of pressure..  The manufacture gives you a spec its 80% ok  However the issue that you run into when many think they need a larger injector is in fact not the injectors issues at but lack of volume.  In a car we run a fuel rail build it bigger you run a larger rail.. There are now larger rails for the HD as most performance shops figured this out long ago. Run a larger injector my drop the duty cycle but you may also be spraying on a closed valve as you ran out of time to fill the cylinder based on cam timing or maybe lack of injector timing control .

I build a 245 hp pro charger bike on a 5.3 injector. I did this with the use of a 1:1 rising rate reg and a aeromotive pump . As in this deal you run a massive inejector to make the peak power but sown low its a mother to tune as the duty cycle is so short..  The 143 I just did was running less than .9 MS at idle and that not taking into account dwell time.  But up top it was right at 90% DS

I would not be surprised to see a rising rate system or DI in the future

[Classic Beast]

Those SE CNC heads are awesome performers out of the box.

Here's the before and after dyno runs when I added the TTS 100 cams to the mix. Amazing TQ from a little 103 with 9.8 compression.

SG

I wonder if I might do better with the TTS cams when I did the static compression it was at 205psi on both cylinders I guess it would be splitting hairs at this point and I am pleased how it runs

[Para Bellum]

Run a larger injector my drop the duty cycle but you may also be spraying on a closed valve as you ran out of time to fill the cylinder based on cam timing or maybe lack of injector timing control .

I'm having trouble understanding this aspect.  Doesn't a larger injector spray more fuel (in a fixed amount of time, at a set pressure) than a smaller injector?  It seems the injectors need to be sized properly to inject during the available time (valve open), with consideration given to the use of the bike (street ridden vs. racing, so more time spent at street RPM or at flat-out RPM).

[GMR-PERFORMANCE]

its based on what tuner you have ..  Cam timing is controlling when the injector fires  TTS at this point is the most simple tuner to alter that.. PV can be done but not per say by the end user. SE tuner you are stuck with what ever you have.  And yes a larger injector does flow more however based on what tuner you are using and the amount ( volume of fuel) you have on had at that given time will dictate how much really gets into the engine .



Its a multi faceted process..

[North Star]

I thought you were running the TTS100 cams and 58 mm TB in that bike?

[Fullsac Performance]

I thought you were running the TTS100 cams and 58 mm TB in that bike?

We have two builds being discussed in this thread.

A 103 with TTS 100s. And a 107 Tman 600s.

Both have the DX Pipe, 58 TB, stock injectors and SE CNC heads.

SG

[Ridgerunr]

Just noticed this, fine work as usual Steve.
There's a guy on the Roadglide forum that says having head work done is a waste of time/$$. I'll reference this for him.

[GMR-PERFORMANCE]

At some point we need to put together a sticky folder with the proper ex set vs not correct.. I just got done tuning a 117 SE kit with the CNC heads was not great as they ran VH high out put mufflers.. Best parts on the planet will not matter if the ex is wrong. 

[Fullsac Performance]

 Best parts on the planet will not matter if the ex is wrong.


True statement! Just ask Bruce Jenner how his new exhaust is working out?   

[Rooster]

Best parts on the planet will not matter if the ex is wrong.


True statement! Just ask Bruce Jenner how his new exhaust is working out?   

EWWWWWW

[Unbalanced]

It might flow better if he removed some of the packing. 

[BostonboyDH]

       

           THAT'S JUST WRONG

[Fullsac Performance]

It might flow better if he removed some of the packing. 

You nailed it. (no pun intended) At the onset of confusion, the exhaust port was re-assigned.
Welcoming directional flow change and constant packing.
Bad Chit. (again no pun intended)

SG

[Para Bellum]

You nailed it. (no pun intended)
Bad Chit. (again no pun intended)
SG

I call BS!

Pun intended.   

[JC]

At some point we need to put together a sticky folder with the proper ex set vs not correct.. I just got done tuning a 117 SE kit with the CNC heads was not great as they ran VH high out put mufflers.. Best parts on the planet will not matter if the ex is wrong.

I also have a 117 with the high output mufflers. What slip-ons would you recommend and what kind of gain would you expect to see?