for those that run them, I lost my sheet that came with and I need to know the dead times at each volt, so I can adjust the battery offset on my AEM EMS since the wizard doesn't have the injectors listed. So any help would be great, thanks.
So what do you do if the wizard doesnt have them listed?
__________________
The purpose of ignition advance is to account for the lag time following spark ignition for combustion pressure to peak at 15 degrees AFTER TOP DEAD CENTER. A little fyi !
I went into the battery offset table for the primaries and entered them manually. I'm still learning my way around the EMS, my friend had another set of injectors selected(800cc) in the wizard and the numbers were way off. I lost the sheet so we tried to get something close, so we could tune. I just started reading through the user guide and figured out how to do it. Not real sure what effect this will have, but figured it should be right.
Quote: Originally Posted by supermech21
So what do you do if the wizard doesnt have them listed?
Ok, I just uploaded my tune with the new battery offset numbers and I'm running rich. I figured it would change something, but I want to make sure I entered everything right. What I did since I'm running a base pressure of 50psi I entered the the values from the flow sheet from the 50psi line into the table. Is that the correct thing to do? Or should I enter the values from the 40psi line? Nacho I'm calling on you lol.
The EMS is asking for idle values. Enter your values based on your fuel pressure @ idle.
I use a base rail pressure of 70 psi, my car pulls right at 18 in/hg (roughly 11psi) so I configured my values (USEC times) @ 60PSI. The EMS scales with the boost pressure.
thanks for the help, I just wanted to make sure that I did it right or not. I have a base pressure of 50psi under vac(8-10 psi) on pump gas, so I entered the information for the 50psi. I'll have to change my E85 tune as well. Again thanks for the help, just wanted to make sure things were right
Quote: Originally Posted by NachO_SRT
The EMS is asking for idle values. Enter your values based on your fuel pressure @ idle.
I use a base rail pressure of 70 psi, my car pulls right at 18 in/hg (roughly 11psi) so I configured my values (USEC times) @ 60PSI. The EMS scales with the boost pressure.
Actually you need to enter the data at your base pressure, not under vacuum. The data is for differential pressure across the injector, which remains constant on a return-style fuel system.
Really? Like I said I'm still new to my AEM and still learning. I thought you were supposed to enter your lowest point for fuel pressure which would be under vacuum. Question, so do the dead time values compensate as the fuel pressure raises from the base pressure since I have a 1-1 ratio fuel regulator? Also do I need to change my values to milliseconds? If so how do you do that lol? Am I missing anything else, do I need to setup anything else on the EMS for these injectors?
Quote: Originally Posted by 2a_ron
Actually you need to enter the data at your base pressure, not under vacuum. The data is for differential pressure across the injector, which remains constant on a return-style fuel system.
Yea, that's the one for our car, our injectors are the same as a k series I believe and don't require any spacers or adapter, unless you have a different manifold that uses RC style injectors. I called them and ordered them over the phone and they had them on sale. I think I could have gotten them for $420shipped, but I had them overnighted so I paid more. Get them for sure, you will love them
Quote: Originally Posted by reed32
how much these injectors cost? i looked at the site and didnt see anything for the srt4....thanks
when changing or setting up injectors it is very important to know what you are changing from
right click the fuel map > change injectors/pressure (last option doing this from memory) put in what your old injectors were rated at and the pressure you were running then put the value for the new injectors CC's per min and fuel pressure NOW when the wizard asks for a battery offset use one that AEM made that is close (possibly another set of ID close to that flow)
all the offset does is compensate for the change in opening and closing speed at different voltages
Well, I looked through the list and there really aren't any injectors close to these, unless my list isn't updated. I think the closest one was a 800cc, all the 1000's in my list are low impedence. I know there was a big difference between the correct valuse ID sent with the injectors and the values that were in the table when I had another injector selected. I know my friend tuned, he did what you said by entering what my old injectors were(stage 2's 680cc I believe) and entering my new one's, so that has already been done.
Quote: Originally Posted by nutz
when changing or setting up injectors it is very important to know what you are changing from
right click the fuel map > change injectors/pressure (last option doing this from memory) put in what your old injectors were rated at and the pressure you were running then put the value for the new injectors CC's per min and fuel pressure NOW when the wizard asks for a battery offset use one that AEM made that is close (possibly another set of ID close to that flow)
all the offset does is compensate for the change in opening and closing speed at different voltages
You should be using the data for your dynamic pressure (which should also be your base pressure). Dynamic indicates the pressure constant with all variables taken into account.
Example: At atmospheric pressure (meaning no boost or vacuum to mess with the fuel rail pressure), let's say your fuel pressure in the rail is 45 psi. Now, say you don't connect your rrfpr and you're running in vacuum, the vacuum in the intake manifold is actually helping to pull the fuel out of the fuel rail, creating a higher flow volume at the same rail pressure. But by connecting the vacuum source to the rrfpr, the amount of vacuum in the intake manifold is equal the amount of fuel pressure that is decreased by way of the rrfpr. This creates an equilibrium, and dynamic (effective) fuel pressure remains the same.
In the same way, the boost pressures in the intake manifold would work against fuel flow through the injectors. If you don't connect the rising rate pressure reference port on the regulator, for every psi boost in the manifold, you effectively lose 1 psi of fuel pressure at the injector (or, fuel flow will be negatively impacted by the equivalent of 1 psi loss at the rail). But by connecting the boost reference port, for every 1 psi of boost created in the manifold, the rrfpr increases the rail pressure by 1 psi, which again creates an equilibrium, and dynamic (effective) fuel pressure remains unchanged.
So, in short, whatever your base fuel pressure is, that's the dead time you will want to use for the battery offset table.
when changing or setting up injectors it is very important to know what you are changing from
right click the fuel map > change injectors/pressure (last option doing this from memory) put in what your old injectors were rated at and the pressure you were running then put the value for the new injectors CC's per min and fuel pressure NOW when the wizard asks for a battery offset use one that AEM made that is close (possibly another set of ID close to that flow)
all the offset does is compensate for the change in opening and closing speed at different voltages
I used to think the same thing...use an injector dead time for a set of injectors that are close to what you have, and it should be ok...
But, if you look at the dead times for RC 1000s and compare them to RC 1200s, you'll see that there are HUGE variances, even for such a small change in injector size.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.
injector dynamics 1000's info
New turbo setup and transmission setup
I just went threw and corrected my offset tables, since AEM doesn't have them in the table.
Linear Mode
