Injectors - what can I expect?

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Attended my first BD Dyno day-a very good experience. Was able to get my 92 truck (stock) on their new Mustang Dyno with the following results:
Max Power : 157. 1 @ 2480 RPM
Max Torque : 362. 6 @ 2000 RPM

I understand that the 16cm2 housing will basically give me quicker spool up, but the best increase in power comes from the injectors. At this point in time I do not wish to change the pump settings.

What sort of increases in power can I expect by changing to performance injectors?
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Al


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92-LE,Cummins,Tach,4x4,5spd,3. 54,Borgeson steering shaft,

 

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I don't know if there are any before and after dyno numbers. But theres no mistaking the seat of the pants differance.
Also consider replacing the exhaust sys. The stock one is crushed going over the top of the rear axle.
Gene
92 350 4x4

 

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Gene, thanks for your reply. I am aware of the exhaust restrictions, that is on the list for the future. Did you leave pump at factory setting when you upgraded the injectors?

 

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Al, are you going to go with the BD injectors or ??? I am wondering if the minimal increase we saw (your 157hp vs 174hp on the '93 and '92 rigs running the dyno) were specific to the BD injectors. One of the BD folks said the injectors were rebuilt... not new. wonder if that made a difference.
Gary

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'92 W250 LE 4x4, NV4500 5spd, Borgeson steering shaft, PrimeLoc

 

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Hi Al
I replaced my stock injectors with a set of BD Power injectors in May of 98 and have never looked back. I am also running a Banks Power pack and K&N air filter. In June of 98 I went on an 11,000 mile round trip back east. I ran into 2 "hills" on that trip on which I had to take my truck out of cruise one was Cabbage Hill out of Pendelton Or the other was Briddger Pass in Montana. My trailer weighs in at about 6,000 lbs so my Cummins was pulling just under 11,000 lbs. mileage is also better and I can generate 27 lbs of boost unloaded. It was the best $750. 00 I've spent on my truck. You - WILL - feel the difference.

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1993 250 4X2 - Banks Power Pack, BD Power Injectors, K&N Air Filter, 6 gauges and tweaked
pump. 27lbs boost unloaded.

 

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Gary, the other two trucks (one 92 & one 93) are both automatics whereas mine is a standard. I don't know whether there is a difference in horsepower and torque between a standard and an automatic. It was also my understanding that the BD injectors were rebuilt.

Bob, good to hear that you are happy with the BD injectors.

Cheers,
Al

 

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Al I had turned my pump up before I bought the injectors. When I installed them I also turned the pump back closer to the stock setting.
Gene
92 350 4x4

 

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You can expect alot of fun after you have the new injectors, or I know I am. There is a noticable difference in the overall performance of the truck... . unmistakeable. My first concern with the new injectors was the smoke issue, but there wasn't very much at all. Now that i have played with my pump alot... . well, let's just say I have plenty #ad

cody


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91 4x4, 5 speed, 3. 54 gears, pw injectors, 12cm turbo housing, K&N air filter, "tweaked" pump, isspro boost and pyro gagues w/A pillar mount, straight piped 3' exhaust <a href="http://albums.photopoint.com/j/AlbumIndex?u=1291328&a=9573783">
See my photos of Recreation at PhotoPoint</a>

 

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My truck is the '93 automatic mentioned above. At 2480 rpm it produced 174. 5 hp and at the same rpm, 369. 3 ft. lb or torque.
Going from stock injectors to BD, like going from regular gas to premium in a gas powered car. Replacing the exhaust with a 3. 5" one from and including the muffler back after the original broke earlier this year also perked it up and dropped egt close to 100 deg. F under load.

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Ian.

'93 D250 ext. cab. Upgraded injectors, 3. 5" exhaust, K & N filter, Xmsn oil cooler and fan, 4 gauge mount, mirror tubes reversed, RACOR fuel filter, larger transmission oil pan.

 

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Well, I have lots of additional power as well as some smoke with the new PW injectors but there is one thing I havn't seen anyone talk about. It seems like the truck has a slightly rougher idle than before.
Has anyone else noticed this or do I have something going on?

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Stan
93 2WD extended cab, Banks Power Pack, K&N Air Filter, PW Injectors,Auto w/4. 10 rear with limited slip, US Gear Exhaust Brake, 31/2" Exhaust, 5K air bags, Boost/Pyro/Tach Gauges, Green/Silver, 146K

 

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Hey Paccool
I thought mine was the only truck to experience anything negative with the PWs.
Mine also idles very rough. Actually feels more like a harsh vibration. I've tried increasing the idle rpm to about 800 and it has helped a tiny amount , but definitely hasn't cured anything. I love the perfomance increase everywhere else, but the idle problem is a hassle. Hope someone on this forum has an answer to this. How about it all you gurus?
Led.

 

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Ledco,

Does the truck have a different sound at idle? Maybe a deeper sound?
My truck almost sounds at times like it's missing. I'll have to get the pump setup soon and will find out then I guess.

Went through San Francisco last monday pulling my travel trailer. Never did have anyone beat me off the lights. Love that extra power!

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Stan
93 2WD extended cab, Banks Power Pack, K&N Air Filter, PW Injectors,Auto w/4. 10 rear with limited slip, US Gear Exhaust Brake, 31/2" Exhaust, 5K air bags, Boost/Pyro/Tach Gauges, Green/Silver, 146K

 

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Paccool.
It does sound a little different. The only way to describe it is that it does'nt sound "happy". It sounds like it is sort of struggling, not smooth like it used to be. I also can smell more fuel in the exhaust at idle. Not raw fuel, but it smells like a real rich fuel/air mixture. At idle when cold it has a light blue smoke for a short period of time.
Led.

 

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Ditto on the smoke when cold.

Stan

 

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Guys,
Not real sure about the smoke, but sometimes after changing injectors you may have to increase the idle screw to keep the idle speed where it used to be. I've changed injectors before and had to turn the idle screw in. I had lost about 100 rpm's after the injector swap. When the idle is to low on these engines, they do shake a little and seem to idle rough. Once I put a set of recons in a truck and it white/blue smoked and ran rough like it had a miss and when you were decelerating (like when gearing down to slow up on an off ramp or at a red light) it seemed like it had a jake brake on it. engie would lose rpm's fast like it was struggling. You may need to check the injectors and/or the sealing washers around them to be sure you don't have a bad injector or a leak.

All mechanics will tell you that there is a possibility of getting a bad injector in any of them new or recons. I am a stickler and will not have a truck that doesn't idle smoothly, this is a sign that something is wrong. If all you've changed is the injectors, I'd suspect a weak injector if you cannot find a leak etc. Try cracking the injector slines one at a time(be careful of fuel spray, it is under high pressure, possibility ofinjection into your skin or eyes). If you crack each line at the injector, do this one at a time and if each one you crack it should make the truck stumble or run worse. If you crack one and it does not affect the idle then that cylinder is suspect. It either has a weak injector, bad sealing washer, leak in fuel line, etc. , etc. IOf you find one that is suspect then swap the injector with another and see if the problem changes to the other cylinder, if so it is the injector if not is is something in the fuel delivery system. I am not a ceritified cummins mechanic (a quote from the assholes at the local cummins shop), but i ain't no fool either, I do repair alot of farm equipment and work on these trucks regularly. Hope this helps. If not let me know and we can discuss other alternatives.

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1989 D 250 Ice blue met. 5 spd 3. 54, 140,000, Banks stage III powerpack straight exhaust, pump adjustments, still looking for more power in the form of new injectors
1999 3500 4x4 Chassis cab Emerald green ISB 5 spd 4. 10 K&N Filter straight exhaust 9 ft flatbed WARN fenderflares,Let, 275hp injectors installed, boost and pyro gages, VA plug'n power Love it, Jacobs E brake
May buy another one in 2009!!

[This message has been edited by Big Don (edited 11-03-2000). ]

 

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Thanks for the input Don. Will check things out today and hopefully have a good report to post.
Led.

 

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Ditto on the thanks,Don
I'm leaving on a business trip today and won't have a chance to check out the truck for a couple of weeks. I'll be watching this post though for any info that may come up.

Stan

 

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. . anybody discover anything else regarding an idle problem after installing PW injectors?
gary

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'92 W250 LE 4x4, NV4500 5spd, Borgeson steering shaft, PrimeLoc

 

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I doubt these injectors are the cause of an idle problem. Mine smoothed out, and went up a few rpms. My pump has the power adjust in about 1. 5 turns, and the smoke limiter screw was in a bit as well. No diaphram changes yet. Could be a bad injector - just because they are new does not gaurantee that they all are correct.

If the idle problem started right after a swap, I would guess all the air didn't purge. Bleed the high pressure lines at the injectors while running - wear protective glasses and use a piece of cardboard or something because that fan will kick it all over you. Your idle should change noticably for each one as you bleed it. If it does not, you have air in that line, or you have a bad injector. If you can repeatably bleed a high pressure line and not get an rpm change at idle, suspect that injector and swap it if feasable.

Bleed the low pressure off the lift pump first. Let water out of the separater too.

Turn your power screw in 1/3 or 1/2 to get your idle up just a touch, or use the idle set screw.

Try undoing your gas cap (honest, this was a huge problem for my truck at idle and running in general, even with new lift pump and filter).

Buy these injectors and smile. The price is awesome and my few days of experience is all positive.

jon

 

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Checked out almost everything checkable and injectors are okay. Reset the idle speed to the specs in the shop manual and the vibration has diminished greatly. I still feel it somewhat but I think it's because I know it's there; if you know what I mean. I haven't got into pump settings and re-timing yet, but will have to soon as it still smokes(bluish-white) at idle when cold and fuel mileage has gone into the toilet (15 mpg in city). Has anyone had any experience with curing a poor fuel mileage problem? Sure could use some help.

Led.