More Stupid Questions About Stuff I Have No Buisness Asking About

theSLEEPER · #1 Tue, October 13th, 2009, 08:06 PM

So... "Fast" injectors... I get a lot of run around asking about these...

I am just wondering basics of making them run and what the differences are.

Seems like to make it "fast" you have to increase the pressures all the way around... Spring pressures, opening up orfices, who knows what else... But I think the spring pressures on the nozzle valve are really important. If that pressure is higher, it seems like to have ICP reasonable, you'd have to advance SOI so that it would have time to overcome that pressure?

To make large nozzles idle without a lot of smoke, would you advance SOI and jack ICP up so that you get good atomization?

***cleatus12r*** · #2 Tue, October 13th, 2009, 08:26 PM

Quote:

Originally Posted by theSLEEPER

So... "Fast" injectors... I get a lot of run around asking about these...

I am just wondering basics of making them run and what the differences are.

Seems like to make it "fast" you have to increase the pressures all the way around... Spring pressures, opening up orfices, who knows what else... But I think the spring pressures on the nozzle valve are really important. If that pressure is higher, it seems like to have ICP reasonable, you'd have to advance SOI so that it would have time to overcome that pressure?

To make large nozzles idle without a lot of smoke, would you advance SOI and jack ICP up so that you get good atomization?

I have no idea about the first question since every injector "builder" is going to do something different to make the injector saturate and empty faster....it's all about the amount of fuel delivered in a short amount of time which revolves around how fast the oil can fill the intensifier and how quickly the fuel chamber can be emptied.

The second one is easy. Shorten the pulse width (injector on-time) and slightly increase the ICP.

theSLEEPER · #3 Tue, October 13th, 2009, 10:38 PM

Just wondering. What's your setup? And have you tuned many high HP trucks? Not being a SA. Really just curious because I have a lot more questions.

***cleatus12r*** · #4 Wed, October 14th, 2009, 12:21 AM

I've tuned quite a few stock trucks. AA, AB, and AD injectors only. No big oil, no fancy stuff. I know what I like a truck to run like so therefore that's what I do. It turns out that a lot of other folks like what I do too.

I did put ADs in a 96 and tuned for that.

My setup is absolutely boring. It's a great-driving '01 with PMRs, a "mechanical diode" intermediate sprag, no lift, stock size tires, and USA turbo. Max power? 321 corrected. Whoopadee-doo.

It makes a great test bed though.

theSLEEPER · #5 Wed, October 14th, 2009, 09:14 AM

Cool! Hell, if I had Minotaur, all I'd be focused on is having my truck set up for EVERY situation... So I dont blame you!

Are the single shots a whole lot different?

***cleatus12r*** · #6 Wed, October 14th, 2009, 09:45 AM

That's really what I focus on right now because there is about zero demand for super-high performance diesels. The most you really see around here is Edge Juice or similar HPOP modules that folks paid way too much for. Nobody is interested in making 400+ HP but they really want better response, better shifting, and the ability to tow safely at the same time.

I have about 6-7 different programs per HP level for towing, daily driving, or performance. I have about 9 levels per PCM calibration for the SD trucks and 3-4 for the OBS trucks...each with varying amounts of accelerator pedal feel and fueling rates. I created them to be compatible with any situation.....but I'm constantly changing and rebuilding them into more superior programs the more I learn from asking questions or changing certain functions.

Single shots different? Yeah, there are a couple maps in the tuning software that have to be changed. I think Bill wrote a long article about it over at PSN.....I'll go find it quickly.......

Here it is:
http://powerstrokenation.com/forums/...ad.php?t=37114

Enjoy!