Whats all the fuss.

[phillips5]

I don't get it all the talk about turbo housings injectors bigger exaust to get over 30 psi boost. All i did is turn in two screws and run the hi idle up to 3200. I got 35 psi out of both my 5 speeds 89 and 90. For free. I only get 25 26 27 or so out of my 93 auto but I thought that was because of that junk torque isn't causing the engine to work hard enough to get to 3200. It just goes up against the governer and the truck catches up eventially .

 

[Greenleaf]

Well dude, I have several mods and as of last october I can "only" get 26 psi. My screw is turned in so far that I'm near runaway. I think it's the auto transmission and fact I have a tough time "loading" the engine. I can shred the rear tires though, if I like and get some real hot exhaust temps too!



I am currently performing a turbo upgrade and internal pump mods to "see" if I can get anywhere with that. Also will test the intercooler for leaks.



I'll tell you this. I can't make smoke like the manual shift trucks can. The darn thing won't allow me to "load down" and work the engine.



Scott

 

[JLEONARD]

I don't get it all the talk about turbo housings injectors bigger exaust to get over 30 psi boost

Don't forget you (and I) have non intercooled engines.

"Standard" pressure loss across an intercooler is 4 to 5 psi according to "the book".

My truck was pumping about 22 psi in stock form... or at least what I think was stock when I bought it. The smaller housing made it much more "drivable" especially around town as it shifted the entire power band down about 500 rpm. I upgraded exhaust size only after my stock system crapped out, but what that did performance wise was pretty amazing IMHO. The big difference is spoolup.

Rotating the fuel eccentric cone was a pretty big power improvement. One of these days I'll turn in the fuel screw

Jay

 

[dpuckett]

Originally posted by JLEONARD

Don't forget you (and I) have non intercooled engines.

"Standard" pressure loss across an intercooler is 4 to 5 psi according to "the book".

And dont forget that our older ones have hotter injectors- flow similar to the PWs or maybe a hair more. I remember way back when the PWs first got going good, that a few guys actually LOST power going from (nonIC) stock to PWs. Combine that with the pressure loss across the cooler, and it can easily add up to 10psi or more loss for the same HP. So does that mean I stand to lose 5 psi boost when/ if I get around to intercooling? Oh dang, I'd have to add more fuel then. I still have 8 psi left in the AFC cone



Daniel

 

[rowland]

I too could hit 30 psi with my mostly stock '89 (1. 5 turns on the power screw). I switched to the later model head and injectors and intercooled it and now I make only 19-20 psi. Power is better however and it runs much cooler. Its not all about the boost I guess.



The biggest change was the injectors, I took a power loss when I put in the PW's and it ran hotter. Installing the IC cooled it off and alowed me to run more fuel to get the power back (and then some).



One of these days I'll invest in some real injectors and ditch these PW's.



Isaac

 

[DKarvwnaris]

If you have a non inner cooled truck and crank that screw in, your temps will quickly cook the thing to death. Make sure before you play with the "power" screw, that you at least put a pyrometer gauge in. I consider pyro and boost gauges my first investment in any truck I get. Inner coolers are the second addition if it is only a 6bt. Only then will I play with the fuel, power is cheap with the screw, blowing the turbo, head or manifold is not.

 

[phillips5]

I skiped the cone thing I just bottomed out the afc screw and let it get all the fuel right now. I guess I don't remember what kind of boost I got bofore I put the 4 inch stack on. I do remember racing mustange GT's and Transam GTA's and staying side by side them. Back in the early 90's. Man that was fun but the 4 head gaskets didn't like it much. Never had any guage but the boost and it is still runing strong 500k miles. More than half of them were over 30 psi throu to 5th gear at every stop sign. The hardest thing the truck did was pull a backhoe to Bowlinggreen Kentucky. That hill from cincy. into Kentucky was bad. The heat guage went up up up the fuel guage went down I could smell antifreeze hot paint hot gear oil. There was a 4x4 holding the plastic tool box away from the stack it cought on fire people were pointing. Finally I droped to third before I melted something and backed off because now that tourqe was going throu the counter shaft bearing.

 

[Excessive Force]

Originally posted by phillips5

The heat guage went up up up the fuel guage went down I could smell antifreeze hot paint hot gear oil. There was a 4x4 holding the plastic tool box away from the stack it cought on fire people were pointing. Finally I droped to third before I melted something and backed off because now that tourqe was going throu the counter shaft bearing.

:--) :--)

 

[Greenleaf]

... ... ... ... ... ... and the engine is still going strong!??? ... ... ... should have invested in Cummins Stock long ago. Not even John Deere engines will hold up to that torture.



I used to get a kick from abusing an old John Deere "A" Now torture my model 70.



Scott

 

[phillips5]

I don't know why the thing won't just lay down and die. My old boss used to say "your going to break that thing in half". I halled a w18b case loader across town I took it nice and slow and easy. Hauled 10 3000 lb. concreet blocks two loads after work for a week. Went only 35 and made my turns nice and slow and wide so I wouldn't wear out those 14. 5 trailer tires. The year after that kentucky trip I hauled a Ih loader tractor to vergina. That finished off the counter shaft bearing My buddy had to haul me home with his 96 cummins auto. He couldn't go up the hills 25 mph foot on the floor. I was moving twice the weight going up most hills 60mph. He still won't crank it up.

 

[phillips5]

Greenleaf My brother by's sell's and restores the 720's 730's 820's 830's

 

[CAROLINA CUMMINS]

Huh, I get 35# out of mine. The EGT's aren't very high, I can hit 1200 if I try, but not often. I think I may have hit 1400 twice in a year, but then I don't tow much. I think I could get some more out of my pump



Steve

 

[Greenleaf]

Greenleaf My brother by's sell's and restores the 720's 730's 820's 830's

Oo. Oo.



I have a 720 Diesel, my pride and joy!! I sold the 820 not too long ago Guy in Coal City Ill. picked it up,,,,handed me a wad of cash and hauled her away ... . site unseen!



I tried to fill the empty spot with a 70,,,,, It didn't work.



-S

 

[phillips5]

Nothing like the thud thud thud of huge pistons

 

[BushWakr - RIP]

Come on Scott... . let's get with the program here...



You been tinkering on that thing long enough,,, get it done and do some driving... . geezzzz..... kids... .....

I can't wait to hear... .



pastor bob.