05-05-2015, 07:35 AM #1
Solution for 110% Injector duty Cycle.
At full throttle I have about 110% duty cycle on the injectors.
My base pressure is 50 PSI at them moment.
Now I make about 21PSI boost.
The question is:
1. Is it better to raise the fuel pressure to a static 60 PSI and leave the rising rate disconnected as it is now?
2. Hook up the Rising rate and have a 71 PSI fuel pressure at Full throttle?
05-05-2015, 08:16 AM #2
Try it at 60 with the line hooked up. It should keep your pressure at about 60. Hopefully that will get you under 100% at least.
05-05-2015, 09:17 AM #3
I tried to run stock injectors with 65, 75 and 80 psi of fuel, static,the ideea is very simple, when you have big fuel pressure AFR is more stabile and in my opinion, more power ! I will run with small injectors and big pressure, the max pres inj can take is around 100 psi.
Last edited by SOV; 05-05-2015 at 12:53 PM.
05-05-2015, 04:16 PM #4
Surely the injector cycle is in the tune
If your lambda is lean then you need to add pressure till lambda is safe
05-05-2015, 07:23 PM #5
If you use the rising rate, your pressure essentially does stay static. When you have pressure in the intake pushing against the fuel, your effective fuel pressure changes. The rising rate feature keeps the fuel pressure rising as the I take pressure rises, keeping your effective fuel pressure static. This makes tuning easier as now you only have to compensate for the additional fuel that's needed as revs and boost increase, rather than needed to add fuel for that plus the decrease in effective pressure. Basically your fuel map will look more linear and you'll get more out of your injectors using the rising rate feature.
05-05-2015, 09:36 PM #6
The real solution for 110% duty cycle is bigger injectors.
05-05-2015, 09:59 PM #7
- Join Date
- Jan 2008
- Currituck, North Carolina, United States
At 110% the injector will get hot as its not really closing
05-05-2015, 10:39 PM #8
- Join Date
- May 2006
05-05-2015, 11:11 PM #9
What injectors are you currently running? Figured you had already gone for the ID 1000's, to run with the Motec setup.
05-06-2015, 09:51 AM #10
Yes I have the 1000's.
Guess I will go to 1300's
Anyone wants to buy my 1000's?
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