[389SixPack]

The firing order on the PSD is 1-2-7-3-4-5-6-8, and all injectors are controlled by the PCM which drives the IDM to fire the injectors. At high RPM, the IDM has limited capacity to maintain the firing pulse width. Has anyone thought about or tried using 2 IDMs wired into the PCM, where IDM 1 would fire 1-7-4-6, and IDM 2 would fire 2-3-5-8, thereby extending the ability to supply a longer duration firing pulse width and recovery time to charge for the next pulse? If I have the IDM firing pulse concept wrong, someone please inform and enlighten me. TIA.

 

[OldschoolPSD]

When I was on the phone with swamps the other day, they hinted towards a setup that was "Crude, but it works great" for fueling at high rpm's.


That sounds like a crude setup that just might work... I don't know if thats the exact gist of the setup, but at least i know that some of our vendors are trying to solve the pw issue so we can spin these things. They said $2500-3000 and I could have it in time for next pulling season. And fuel to any RPM. Personally, I can't wait for the day when I need an aftermarket tach:rockwoot:

 

[gregrob]

What about swamps pullin truck with the controller from england or wherever it is.

 

[smorris]

I have heard of someone running two, cant remember who, or where. It was my understanding that thats not the problem. I believe the issue was that the pcm can only fire one at the time. At lower rpm its fine because of the amount of time needed is low. But at higher rpm's the amount of time needed is too much , because it then has to start firing one injector while another is still fueling, and the stock stuff cant/ wont do that. SO, it cuts pulsewidth back enough to not have overlap. Someone please step in and explain better............
And PLEASE fix it!
lol. Me wants more rpm too!

 

[Dieselfever]

What about swamps pullin truck with the controller from england or wherever it is.

Which one is that ??

-Michael

 

[gregrob]

Let me find a video of it.

 

[OldschoolPSD]

Over 2800rpms iirc is when the computer starts cutting pulsewidth... there is no way around it using the factory computer setup that I know of.

The only way to get rpms out of them is to put injectors so damn big in them that they still inject a ton of fuel at very short pulsewidth. Then they fuel so much down low that they tear the bottom end up.

If someone comes out with something, and we can get full fuel at say 4500rpms... we can make these sons-a-bitches runs.

 

[Vq2Fast4U]

Has anyone used stand alone engine management for a PSD. Something similar to this - http://www.motec.com/products/ecu/m800.htm

 

[OldschoolPSD]

That seems to be the direction this stuff is headed. I've heard from a few of the big wigs that the factory PCM has to go. Simple idea, its the exacution that is difficult/costly.

 

[Dieselfever]

Let me find a video of it.

Still waiting oke:

-Michael

 

[mech2161]

Still waiting oke:

-Michael

Why don't you set the record straight insted of playing dumb! :lame:

 

[OldschoolPSD]

Well please feel free to enlighten me... after all I am just a lowly amatuer.

 

[389SixPack]

Do you wear blinders or do you guys just make this stuff up?

David, please don't hold back. Let us in on your knowledge. Hoping what this thread is for - learning, ideas, etc.

 

[smorris]

Me so blind.

 

[mech2161]

I thought this site would be different. Some people want to know, some already do. The ones that do with some exceptions are still jerks!oke:

My take on it is that it's not the pcm that's the problem. The transformer in the IDM can't recharge fast enough to fire the injectors at higher rpm's. I may be way off base but what do I know.

 

[mad_matt]

I would bet some $$$$ it's a combination of all factors that are powerstroke. Hydrolics are slow in trems of receovery compired to eletrical divices. Our ECMs are probably 70sor 80 vintage Processors that are slow and the IDM was probably made to be just fast enough to sustain Red line reves for some set period of time like 30 45 secs. Now that all asisde. The stand alone EMS is between 2K and 5K then you need to build a wireing harness that connects to everything that the factory harness does. That in itself is worth about 5K From there the new EMS needs to be taught how to replace the stock ECM and send the right info to all the sensors and components of the motor..... Loads of Tech support on site @ some rate of $200-300 and hr. I would bet it would take a good week or so to make things work. Add it all up and there aint any way it's worth it. JMO. I truly wish it was.

 

[blackstroke33]

David could you please post some information on whats holding back the injection system? I think it would help alot of people on this website including me.

 

[smorris]

Has anyone ever thought of retrofitting the stuff off a 6.0? Dont they still have the same type of injection, and controls? If so, dont they turn more rpm's from the factory? Come on, it cant be that hard. I mean, if I can put all ford fuel injection, and controls on a chevy motor, then I dont see where this is all that different. I havent worked on a 6.0 yet, but if they have the same basic type of injectors, then theres gotta be a way of adapting it to a 7.3. If not, then, will someone please explain what really is the problem on these. I have had mine at over 4500 many times, just not at WOT. Runs really good long as its part throttle. Matt it, and it falls on its face. So, that right there tells me that its capable of it, just that something is holding it back. So, please do explain if you really do know!

 

[STROKIN N STYLE]

until someone figures it out just run big nozzels to get the fuel at 2800 rpm and higher, when the pulse width cuts there is still fuel to be dumped. im running a 200% over stock nozzel and it is still pulling pretty hard at 3200 rpms on the interstate the other night!

Can't wait till somone figures out how to get the rpms higher, then maybe we can run with those cummins guys.

 

[Dieselfever]

Why don't you set the record straight insted of playing dumb! :lame:

I don't know of any Swamps pulling trucks with any computer stuff from England. There is one I know of that has the Baumanator(sp?) but that is for tranmission control only and I'm not sure where it originates either

Every other truck that I know of on the 'pulling circuit' has factory PCM, etc.

-Michael