got boost?

[Old Smoky]

What kind of boost numbers should I be getting? I am only getting about 1 psi crusing at 55-60mph. Under full-throtle acceleration I get about 13-14 psi. Is this correct?

Note that the 16cm turbine housing that appears in my sig. is setting on the passanger seat. Its being installed next week.

 

[Wayne M.]

Old Smokey, I have a similar truck except auto. and has the 16cm hot end. I usually got around 14-16 PSI. The 1PSI you're getting is a good guide to the cruise load the engine is under, I usually see around 2. If you go up a light grade or buck a headwind, expect to see around 3-5.



I made a post a bit back about my truck getting to only 13-14 PSI, which is down a couple. I am still trying to find a reason why this is. So far I have pressurized the intercooler and plumbing and the boost gauge plumbing and took a lot of slop out of the throttle linkage at the ball and socket joints. I still need to change my fuel filter since it's about due.



Let us know what happens after you change the housing.

 

[BushWakr - RIP]

Old Smoky, those numbers are about right for a stock 1st Gen truck. You'll see a bit more with the 16cm. Perhaps 2-3psi. but it will spool up quicker mostly. Once you install the 16 you can adjust fueling with less smoke than stock housing.

1-2 psi boost on flat ground, running empty is ok. Like Wayne said, you'll see that fluctuate a bit when you encounter a headwind, or slight grade. I normally run at about 3-5 psi at 60MPH on flat ground showing about 1700 RPM in OD.



Regards, Bob

 

[Old Smoky]

Well guys, it looks like my numbers are close to what they should be. I thought they would be a little higher for some reason. Maybe because I can hear the turbo spinning, I assume that pressure is being produced. It is amazing how seldom the turbo builds significant pressure. I guess seeing little or no boost driving around town is normal? Thanks for your input.

 

[Power Wagon]

Hi Smoky...



Yeah, your boost sounds fine, for what you have.



On the other hand, I used a 12CM wastegated turbo housing, and I get quite a bit more boost almost instantly upon mashing the pedal. No, I don't have a gauge, but I set my wastegate to open at 18-20, and it spools to a certain pitch and stays there, which leads me to beleive it's where the 'gate opens, and it does so at almost any speed. You can have turbo shriek within 2 seconds of hitting the pedal. It'll build boost and spin the tires in about 2 seconds from a standstill and idling.

 

[bflood]

Turned up Pump?

Old Smoky, Your numbers sound okay for a stock setup but I wonder about your "turned-up pump" being turned up . I was getting 14-15# peak boost BEFORE I tweeked the pump (and with a stock housing). After turning up the pump I was getting 30+ and I backed it off a little to 26-27#. I then added the 16cm2 hsg but peak boost pressure didn't change (as expected).

 

[Old Smoky]

bflood,



Wow, 30psi! With no other mods? My aneroid is turned to allow the pin to travel as far as it can. The full load fuel screw is barely turned (I didn't even turn the idle down. It idles about 875rpm) and the smoke screw has been turned just enough to get a better "launch," without getting much smoke. I didn't want to reduce pump life, and have to mess with turning the idle back down. How has your pump been adjusted? Do you get much smoke?

 

[bflood]

Old Smoky

Well, I'm actually a newby here, and I hope I don't use the wrong terms (my notes and references are not handy right now) but here goes.



I only adjusted two things. I turned up the fuel screw all the way and turned the aneroid screw about 2 turns (don't make me go out and check my notes in the truck right now). I got the 30psi and too much black smoke at initial acceleration. So . . . I backed off the fuel screw a little (1/2 turn?) and backed off on the aneroid until most of the black smoke on hard, low rpm, acceleration stopped. This is where I ended up with the 26-27 psi boost.



I still get some black smoke at low r's if I push it early, but not too bad. I might back off on the aneroid a little more yet. On long accelerations, flatfooted, I'll get some mild gray smoke. I understand there are two other adjustments inside the pump but I'm waiting until I learn more before making more refined adjustments.



I don't know what I have for injectors but I assume they are stock. I don't even know how to verify this but there were no apparent mods to the engine when I got it last year.



When I put the coal to her, I wince at the thought and feel of what the rest of the driveline is going through . . . but it feels good!! This lovely beast loves to puullllll! Oo. Oo.



Sorry if this is too wordy.

 

[Old Smoky]

bflood



Maybe I should try turning the full load up a little more . I turned it in about 2 turns or so about a year ago, just to see what would happen. The idle went up to 1100 rpm and there was a noticeable increase in power. I took it on a test run and found that from a standstill I could fill a wheat field full of black smoke

:--) I could try turning the smoke screw out and adjusting the aneroid so that the pin wont ride in so far, to get less smoke. Some smoke is good, but not too much. There just seems to be too many combinations. It runs fine now, but with a few turns of a screw or two it might run a little better

 

[Lil' Dog]

Re: Turned up Pump?

Originally posted by bflood

Old Smoky, Your numbers sound okay for a stock setup but I wonder about your "turned-up pump" being turned up . I was getting 14-15# peak boost BEFORE I tweeked the pump (and with a stock housing). After turning up the pump I was getting 30+ and I backed it off a little to 26-27#. I then added the 16cm2 hsg but peak boost pressure didn't change (as expected).

Uhhhh No!!!



I have modified my unit with the full load fuel screw, AFC pin setting, Starwheel and shaved 0. 025" off of the nylon washer on top of the AFC pin and you DO NOT get 30 Psi with stock injectors. I currently see around 17-18 Psi full load boost.



The only way to get 30 psi is with either the 185's or the POD's. Stock injectors will not flow for 30 psi boost, I am here to testify.



I have to call this one out... . sorry. :-{}



J-eh

 

[JLEONARD]

Just installed my boost gage this weekend!!!!

I have a stock engine with a K&N filter and got 20 psi boost this morning on the way to work at 55- 65 mph.

 

[Old Smoky]

Well, it sounds like bflood must have larger injectors?



JLeonard

You are making 20psi with no mods besides a K&N filter? At 55-65mph?



When I shift into 5th and floor it, I am going about 75mph by the time I hit 13-14 psi. It takes forever to build boost, in all gears.



What do you guys think?

 

[Mel Fuelling]

My pickup has a reasonably constant daily working load of 8,500#

+/- 300#, so its not much of a performance reference. My boost

was 16# stock, 22# with PW injectors, and 15%enhanced pump,

but didn't really liven up until I advanced the pump to 1. 5mm

AND turned the delivery rate up(see sig). I'll keep it from rolling

any smoke at low rpm with my right foot until I get the starwheel

adjusted right.



Mel

 

[bflood]

Well Lil' Dog, you may be right about my injectors but I just don't know. If you're right, I'll consider myself lucky to have a previous owner put some good injectors in. How can I tell what they are (without removing them)?



Oh, I forgot to mention that after I increased the fuel screw I did have to adjust the idle down a little.



I was around town today, on the backroads, with no load and nothing in tow. I goosed it on a couple hills and got 26# before running out of road. No BS about the boost levels.

 

[JLEONARD]

You are making 20psi with no mods besides a K&N filter? At 55-65mph?



When I shift into 5th and floor it, I am going about 75mph by the time I hit

13-14 psi. It takes forever to build boost, in all gears.



What do you guys think?



Actually I did another test on the way home from work yesterday. Unloaded truck going up a grade (maybe 10%) I was able to get 23 psi of boost. I was doing 90 mph, approx 2300+ rpm. (non-calibrated tach, so maybe not accurate)The truck had more, but I didn't!!

No smoke detectable from the mirror. I repeated these numbers a couple of times to verify them.

Manifold will get tapped this week for the pyro and I will report what I see there.

And the truck is stock except for the K&N as far as I know.

 

[Lil' Dog]

I don't know how you can tell what injectors you have in there bflood but they sound like LUCAS by the sounds of your performance. I admit my pump may be old so, 20 Psi may be attainable.



Before I had my timing set, it was at 1° I could ge 21-22 psi fully loaded, but after having it advanced back to stock, 10°, the boost is down about 2 psi accross the board.



Lucky bugger LOL... . You had some diesel nut juice that thing already... LOL. .



J-eh

 

[Wayne M.]

I just had an idea. I need to check the air line that runs from the intake to the adenoid (sp). If there is a break there, it won't boost well.



Hmmmmmmmm.

 

[Old Smoky]

16 PSI

Today I did a little tinkering on Old Smoky and go him up to 16psi. I turned the full load fuel screw in 1 1/2 turns, turned the smoke out 3/4, and turned the aneroid so that it's halfway between stock and max. I also lowered the idle, of course. Boost comes on much faster now, and so does speed! It smokes just a little more than I care for though. Maybe some fine adjustments tomorrow. But I'm sure some of the smoke will clear up when I install the 16cm2 turbine housing and advance the timing next week.



One thing I am concerned about is heavy smoke at high rpm’s (its hard to watch the road, tach. , boost gauge, and smoke at the same time, so I am not sure exactly when it starts. ) If I floor it form a stand-still it blows some smoke, the smoke tapers off as the turbo winds up, then it starts smoking again and doesn't really go away until I shift. Then, the whole process starts over again. Why does it smoke a second time? What does this mean? Is this normal? Bad?



When I bought the pickup the pump was already "turned up. " I think the aneroid was just set to allow for more fueling. I guess something else could have been played with that I don't know about (star wheel?). I know the full load wasn't messed with.



Any comments, thoughts, insights, would be appreciated.



Mike

 

[bflood]

1st Gen Pump Adjustments, a clear picture

We've been talking alot about pump adjustments. Some probably already know about this information but here is a very clear, and illustrated, explanation of the adjustments and innerworkings of the 1st Gen VE Injection Pump, located at dodgeram.org. I found it to be extremely valuable.



http://dodgeram.org/tech/dsl/more_power/Power_ve.htm



Go there - Have Fun! Oo. Oo.

 

[KEENO]

16cm2 installed?

Hey Old Smoky!



Did you ever get the 16cm2 transferred from the front seat to the exhaust manifold?



Tossing the 1992 21cm2 housing & going to the 16cm2 should will help the smoke output concern. With the 16 in place your truck might be just where you want it... . Well atleast for a little while until the need for some POD injectors bites you!



KEENO