dsddcd

So I have been working on my Greddy kit witht the Emanage Ultimate and with the stock fuel pressure and provided 550cc injectors I have maxed out my injector adjustment.

Before we go down the EMS road, I have an AEM EMS siting on my shelf but I have not spent the huge amount of time to figure it out yet so I am running the Emanage until I get there.

Q1.) Has anyone else run into this issue?

Q2.) By my calculations I should not need injectors based on a 80-85% duty cycle and 60psi pressure. That being said I was going to add a FPR rather than injectors. The plan is to use an Aeromotive regulator but short of tapping the rail I am not sure where to check the FP.

Q3.) If I add injectors is there an easy way to scale my current map?

RichV

I can't answer them all, but my tuner had similar problems above 7K rpms. He kept upping the injectors duty cycle, but couldn't get the car to richen up at high rpms. He wanted to check fuel pressure also. He thought it may be the Walbro pump going bad. I finally found a drilled and tapped stock fuel rail with a fuel gauge already mounted, so I am going to check my fuel pressure at my next tuning session (hopefully in January).

The 550 injectors should be plenty big for the Greddy kit, so I would try to see what your fuel pressure is or change out your fuel pump.

The Stock rising rate FPR should be plenty good for the Greddy also.

808eelttam

IMO getting a FPR should fix the leaning out problem since the injectors are more than enough for the greddy kit.

dsddcd

The injectors are pretty close. From my VE tales they just barley cut it at 60PSI and 80% duty cycle. With my cals at 10.5 PSI with exhaust and you can easily push the limits of the 550 injectors. Infact by my calcs if you break into the 315 RWHP range you will have to switch to 650 or 750.

http://www.rceng.com/technical.aspx?UserID...jyf4MCvjJkKgIYq

RichV

Not if the fuel pump isn't putting out enough pressure. The FPR can't up the pressure from the fuel pump. If it could than people wouldn't change fuel pumps, they would just change FPR.

Revenge

I am thinking of going up to 750's with the ult, just tring to figure out wich ones and idea's?

dsddcd

I would recommend the 750's and I personally would stick with RC. Going 750cc rather than 650cc will give you room for more boost in the future. You should be able to take a set of 750cc injectors up to 350-375 at the wheels conservatively. Past 750cc you will need a new fuel system at 1000cc the injectors would max out the 255LPH pump and the fuel lines, rail, regulator would all have to go, but it would be hard to get there with your current turbo.

http://www.rceng.com/Peak-Hold-Injector-PL...-top-P56C5.aspx

I am pretty sure I am going to ditch the Emanage now, I found a local guy to tune the EMS finally and I am ready to do this the easy way. With that I can run the injectors at a higher duty cycle then rescale for bigger injectors as needed later.

Revenge

I am going to stick with the Greddy Ultimate for now depending on how it runs. Then move up to the Hondata. If it works then I'll keep it, if the car rus like garbage then I will make the change.

Last thing what to do with the HG, do 2mm cometic, 3mm cometic, 3mm IP. Shooting for 400hp. Leaning toward the 2mm.

dsddcd

From my calculations with a 2mm HG with a good combustion chamber port and polish and smoothed piston domes you should be in good shape past 18lb. In fact you could probably pull the head and not have to do the HG if you can take enough material out of the combustion chamber, the piston deburr/polish is more for eliminating detonation points.

I am looking about doing this while running the Greddy stock turbo running it way up the sail to around 15-19lb then slowly tapering boost back towards 12-15lb at high rpm to stay inside the sail, which is similar to what my STI does.

ChefJ

My RC 650cc injectors took me to 411whp at 89% duty cycle. I am going to 1200's now but they were fine for me 750s should take yo uclose to 500.