Settings for Siemens Deka (Mototron) 60 lb/hr

[Wasted Income]

Ok guys...I've searched, but it's hard to find the answer I'm looking for....

My setup
2000 5.3L, COS5, return style fuel system, stock manifold referenced fuel pressure regulator.

What tables do I need to change, and what are the values that must go in them for these injectors to idle correctly?

Could somebody post their 5.3L tune (or any tune??) that idles well with a stock cam and 60s??

Thanks in advance!
Jeff

[Highlander]

if you have a return style fuel system.. set them all to 72.6# on the IFR table.

[Wasted Income]

I don't think my fuel pressure is the same as what the mototrons are rated at....I have heard 72.3 or something along those lines.

So with a return style system, the IFR table is flat? It doesn't taper at all like the spreadsheet I've seen?

Thanks guys....

It seems that tuning info on the 60 lb/hr injectors is lol

[joecar]

With a return style MAP-referenced FPR (typically located at the fuel rails), the IFR table is flat all across, its value being the value computed by the spreadsheet for vac=0.

The purpose of the MAP-referenced FPR is to maintain a constant pressure difference across each injector.

Absolute pressure on fuel rail side of injector = FP + BARO + MAP
Absolute pressure on manifold side of injector = MAP
Difference = FP + BARO


A pressure gauge on the fuel rail will show gauge pressure to be FP + MAP...
(since absolute pressure = gauge pressure + BARO)

When measuring rail pressure FP:
- first disconnect the MAP hose (this will cause MAP to equal BARO),
- read the pressure gauge... it will show pressure P (equal to FP + BARO)... P would typically be ~58 psi for GM.
- reconnect hose;

Use the value P in the spreadsheet.

[Wasted Income]

Thanks a TON, Joecar!!

Now what about the other stuff like offset and pulse width and all that?? If you could even point me in the right direction, that would be awesome!

[joecar]

...
Now what about the other stuff like offset and pulse width and all that?? If you could even point me in the right direction, that would be awesome!

Those are hard to derive... I don't know how to do that yet...

[5.7ute]

Good luck finding any solid info on these or any other injectors. I searched for weeks with no real results hence why I am researching injector characteristics a fair bit lately.
Jon@FIC sent me some data sheets which will give you some solid basics to start working from. If you PM me your email addy I will send them through to you.
If your tune is spot on with the standard injectors I also have a few ideas on how you can calculate voltage offsets. They havent been tested yet though. Check out my last posts here http://forum.efilive.com/showthread....jector+offsets

[limited cv8r]

Here is a little bit of info I've collected. Hope it helps

[hquick]

http://www.hptuners.com/forum/showthread.php?t=17962

http://www.hptuners.com/forum/showth...852#post128852

[ryans1000]

5.7ute , do you or anybody have more info on these 60lb siemens. I understand how to do the IFR table but not the other tables like b3701, b4003, b4004, b4005, b4006. Seems like these injectors are very common so I'm surprised I couldn't find more info on my searches.

Some of the threads went over my head. I was hoping I didn't have to do 10 hours of reading followed by hours of logging. I get kind of confused reading the hptuners threads above because the vocabulary and tables look a bit different.

My car has a boost referenced regulator and a fuel return line. 2002 ls1 turbo. I'm running the injectors at 43.5 base right now. Car runs well enough to drive but but idle is sometimes rich, sometimes lean under the same conditions.