Awesome thread!

Great job guys!

 

I have been working on my combination for a few years getting the deal right and making it the way I want it.Driveability is the key issue and while making power is what we all want,I want that and to be able to have no fear when I take it for a long drive.This truck is no trailer queen and gets driven all year long and sits outside in the weather.If I can not drive the truck then I do not want it which is why I have been working diligently to make it a great combo of power/driveabliity.I have done fairly well and along the way have had a few bumps in the road but with 200k on it now I want to see it get to 500k and want to see the fuel only,single charger number go over 600.

I have a few more tricks up my sleeve yet and have a bigger P7100 here on the bench waiting for an install.I am not sure if that the answer yet or not which is why it has not been installed.I will now tackle the task of getting the POS FASS and its pressure issue fixed next or I will replace it with a AirDog2.First we try and rememdy the pressure issue and if that can not be done we will change the pump.I want to keep going in steps so we can see what has helped and what has not......Andy

 

sounds like a solid plan, thansk fro the correction in the pop pressures and thanks for the good read

 

factory pop on my 94 was 260 bar

hammer very nice numbers

 

thinking out loud here, one bar = 14.5 psi

so 270x14.5= 3915 and 300bar is 4350.

so if the pump pumps the same wouldn't it take a XX milli-seconds longer for the pump to build up the extra 30bar and the injectors would fire XX later than if it were to pop at 270 bar. but the benefit from having a higher pressure is the fuel atomize better (if both injectors were 5x13's)

So the fuel with a higher pressure with an injector that is 16% larger, atomization will still be close to the 5x13. so the fuel would burn almost as fast. but the 300bar is what has me wondering about the duration of the pulse for the injector. if it is set at 300bar then wouldn't the duration that the injector stays open be shorter because the injector would only be open when the injector is having fuel being pushed through it at 300bar and up.

 

duration that fuel is delivered is determined by the pump, you are correct about the injection lag, which is where 20* of timing advance comes in; it accounts for the time it'll take to reach the given pressure value. but also the dynamics of fluids are insane... where you think that it'll take a long time for it to build that pressure it really doesnt... like you sia dmilliseconds that can all be regained through advancment. it also depends on the displacement of the fuel in the barrel. more fuel in the barrel while maintaining stock injector lines will reduce lag due to the higher pop pressures... DV's will help abunch too. everything you said does make sense; atomization may be similar but quantity is more... same for injection duration, delay and duration of injection is made up for by quantity

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so i totally re-read that... and i'm all over the place... makes sense to me

 

thinking about it more in English class, when the injector pops at 300bar all the pressure above 300bar will be forced out the injector. so for the next injection burst the injector has fuel in the line already pressurized to 299.9 bar and then the delay dont be so long it was just for the initial start up.

but the duration of the pulse how is that modified or is there a way to mechaniacly to increase duration of the injection pulse with maybe a different cam in the pump?

 

cam profile is the only way there could be a difference in duration but one the plunger is the whole way up its the whole way up it cant bring in any more fuel the only way to increase fuel delivery amount would be the delivery valves and plungers this is way the big boys use sigma pumps they can flow huge amounts of fuel everything inside is bigger

 

very good thread alot of useful info thanks to everybody

 

so bigger valves and plungers is pretty much having a bigger bore and piston in a engine?

same ammout of movement up and down by the plunger but the fuel quantity is bigger cause the volume is much larger. so how long is the duration