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post #1 of 61 (permalink) Old 03-12-2008, 02:52 AM Thread Starter
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single shots yes or no?

i there some reason why not so many people run single shot injectors?

maybe i am confused but wouldnt they be worth it beins not havin to run big oil? or did i miss something?

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post #2 of 61 (permalink) Old 03-12-2008, 02:55 AM
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Re: single shots yes or no?

I think most people run single shots. Its the splitshots you need to stay away from.

Single shots seem to get better MPG and run better then splits
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post #3 of 61 (permalink) Old 03-12-2008, 03:03 AM
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Re: single shots yes or no?

From what I understand they are a bit louder at idle, but yes, consume less oil, and usually gain mpg. If and when I decide on injectors, I'm gonna run singles...

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post #4 of 61 (permalink) Old 03-12-2008, 05:36 AM
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Re: single shots yes or no?

Yep, I run the 175/146 single shots from swamps, no need for big oil since they use less oil and added about 50-60 hp. I bit noisier at idle, but the same noise level on highway. 17-18 mph highway, 15 around town -with a heavy foot.

2003 F250, Wildman tunes, Faubion trns, Swamps 175/146 SS,van turbo/WW, DI Intercooler, oilguard bypass, intank & pre-pump, reg return, Firestone air bags, Bilsteins, 350 HP/692 TQ
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post #5 of 61 (permalink) Old 03-12-2008, 05:47 AM
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Re: single shots yes or no?

singles are what the stock OBS has and splits are the stock SD's....

singles get better milage because they dont shoot that extra shoot of fuel (hence names.... single shot....split shot... )

singles are a little louder because they dont have that extra shot.... I believe that is the only reason for the extra shot... quietness...

The bigger single shots will still need BO (i.e. B-codes) but stage 2 and down they should run fine with without BO because they dont need near as much pressure to inject the fuel efficiently (again, because of the lack of the extra shot of fuel)...
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post #6 of 61 (permalink) Old 03-12-2008, 08:28 AM
 
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Re: single shots yes or no?

Quote:
Originally Posted by lownslow View Post
i there some reason why not so many people run single shot injectors?

maybe i am confused but wouldnt they be worth it beins not havin to run big oil? or did i miss something?
Who said they didn't need big oil

160cc AD singles use about the same oil as a stock AD split, and YES a stock AD split shot needs oil to maintain ICP with aggressive programming and get everything out of the injector.

Sure you can run 160cc singles, or 180, or whatever you want without big oil. But will they perform the their potential, absolutely not. Just like the stock HPOP is not usually capable of maintaining respectable ICP levels with stock injectors.

I have ran 180cc singles before big oil, and after big oil. If I had to take either the injectors or the pumps back to stock it would be the injectors. They made a difference in the way the truck ran but NOTHING like the pumps did. They really brought it all together and made the thing pull, when before it just revved and made a lot of noise.
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post #7 of 61 (permalink) Old 03-12-2008, 04:53 PM
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Re: single shots yes or no?

I said it....

For my setup it doesn't look like I need big oil. My Stock HPOP at 101,000 miles is holding pressure pretty good for this test if I data logged this correctly (only my 2nd time).

This was on my tow setting:

Started data logging at 70 mph, punched it.....hit 100 after 10 secs, she kept accelerating after that.




2003 F250, Wildman tunes, Faubion trns, Swamps 175/146 SS,van turbo/WW, DI Intercooler, oilguard bypass, intank & pre-pump, reg return, Firestone air bags, Bilsteins, 350 HP/692 TQ
2000 Excursion- Pwrd by: T Wildman 6 pos chip, CT Performance Suspension, Riffraff Diesel Performance, J&M Tranny, 4" MBRP, 6637 filter, intank/prepump mods

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post #8 of 61 (permalink) Old 03-12-2008, 05:49 PM
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Re: single shots yes or no?

Quote:
Originally Posted by blk99 View Post
singles are a little louder because they dont have that extra shot.... I believe that is the only reason for the extra shot... quietness...
Reduced noise is what I've always heard and been told was the reason for a split shot design.

Seems to me that a little bit of injector control would be lost with splits, because if I understand it correctly the split shot is done mechanically in the injector. Single shots take away one area that we have no control over -- the length of time between when the injector is told to fire and the main shot actually starts, since the little shot has to go off first. And, I believe this is also the reason programming has to be changed when switching from splits to singles, to adjust injector timing.

With that said, I'm quite happy with my single shots. No desire to have the splits back.

Rich, that's pretty impressive for a stock HPOP. What were the duty cycle numbers?

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post #9 of 61 (permalink) Old 03-12-2008, 07:31 PM
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Re: single shots yes or no?

Jeremy,

The duty cycles #'s ranged from 40.62 to 42.58 during the 2 to 40 seconds time frame on the graph. You can barely see the duty cycle line at the bottom of the graph, should I graph them seperately next time?

2003 F250, Wildman tunes, Faubion trns, Swamps 175/146 SS,van turbo/WW, DI Intercooler, oilguard bypass, intank & pre-pump, reg return, Firestone air bags, Bilsteins, 350 HP/692 TQ
2000 Excursion- Pwrd by: T Wildman 6 pos chip, CT Performance Suspension, Riffraff Diesel Performance, J&M Tranny, 4" MBRP, 6637 filter, intank/prepump mods
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post #10 of 61 (permalink) Old 03-12-2008, 09:23 PM
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Re: single shots yes or no?

The move to splits was originally an emissions thing.

Singles do make more noise than splits, but for a given amount of HPOP, singles make more HP & MPG than splits, all other things being equal.

If there is one reason why more people don't go with singles is the need for new tuning to get the singles to idle smoothly in a 99+ engine.

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