Engine/Transmission (1994 - 1998) 5k GSK kit from Columbus Diesel

[RyanB]

We tightened the springs up one click at a time for about 6-8 tries. Each time we'd put it in drive it would die.

Past a certain point we couldn't get the RPM down below 2000 RPM & didn't attempt placing the truck in gear, we screwed the idle adjustment down, but at a certain point it wouldn't idle.



Do we possibly need to adjust the bracket or grind the idle nut head?

that was exactly what mine was doing and in my above post you will see what I did... worked for me... try it and it should work.



Ryan

 

[CashD]

How much was the kit? I emailed them and they haven't gotten back. DId you have a 4k before? Driveablity?

i second this,, how does it compare to a 4gsk? is 4 and higher safe without additional mods?

 

[zstroken]

$175 is what they told me. Above 4200 you need to be leary of cam and cam gear problems. I had a 4k kit that the springs were set loose and the thing was perfect lopy idle, smooth throttle response. I think cranked it so I could get 3800-3900 throttle was very touchy at the bottom. I want the 5K put it in set it slightly loose so I can hit 4100 or so. Then I can get my smooth throttle response back.

 

[CashD]

even the mid to high 3000's are pretty hard on a truck aren't they? maybe not detrimental, but alot harder on it right? or am i off?

 

[Got Smoke?]

even the mid to high 3000's are pretty hard on a truck aren't they? maybe not detrimental, but alot harder on it right? or am i off?

I imagine its a small bit harder on it than say running 2500RPM's all day, but usually your only turning that many RPM's for a very short period of time. Drag race, Sled Pull, or Dyno. My truck usually see's 3200-3500 at least once a day :-laf but I save the 3500+ stuff for the pulling track or when I'm racing someone..... wind 4th out..... look over, way bye bye... hit 5th and leave 'em in your SMOKE! :-laf

 

[Signal73]

anyone running the titanium retainers+keepers? Are they worth it for occasional bursts past 3K?

 

[zstroken]

I have the titanium keepers and retainers. For anything under 4k just springs is plenty. Titanium keepers, retainers, and springs ought to be good for 5k.

 

[JAmos]

What kind of cam and gear problems?



Jordan

 

[CashD]

i believe it's because the stock cams are cast and they won't hold up to those numbers.

 

[CashD]

i had another thought,,, wouldn't 4000 and higher be almost pointless unless you were sled pulling. at those numbers aren't you just legnthening the gear without big output,, the hp/tq curves have peaked and fallen by then haven't they?

 

[Joseph Donnelly]

Someone who understands the P pump needs to set it up. I set up mine so it didn't defuel until 5400 rpm, and it still idled at 875 rpm like stock.

 

[9 Lives]

Is the 5K kit for sled pulling only or would this do the drag racers any good?

 

[JAmos]

Joe, what all did you do with your truck? How did it run while cruising through town, racing, and sled pulling? How were the hp and tq curves? How useable were they?



Jordan

 

[JAmos]

So... ... .....



Anyone running these springs in a daily driver? Hungary minds await tidbits of information about the performance and driveability.



Jordan

 

[JBrookshire]

I am...

I got a set of 5gsk from J. R Adkins. When I bought them he said to get these things dieled in right u need to put it back on a stand and have every thing re calabrated . But u can put them in without doing so u will just have to do alot of tinkering to get the idle and every thing in time with eatchother. So I got mine in and drove it 40 milesto a pull and pulled it. I pulled it and still couldent get the arrrsss [rpm] up like I wanted to. So I called him back and he said more timing. so I upped it to 40ish and did a test drive and got on it alittle and I smelled coolent. I blew the back driver side freeze plug out. So I had to order a kit from EEP that releives the pressure from turning more rpms got every thing on and it is running good now. I had to take a phew clicks out of mine cause it would stick on me around 3000 and so far it is working good for me. It still idles around 900 but I am happy with it and still can drive it every day if I need to. It is a little touchey at low rpms. But one thing u will need to watch is if u put this kit on u could blow freeze plugs out. THanks Justin

 

[JAmos]

Justin-

What rpm could you rev to before adding more timing? What could you rev to after?



Would you reccomend the 5k kit to someone like myself who is slowly progressing on the path to a hot running truck?



Did the kit change the way it runs at all rpms or just open up more top end?



Thanks, Jordan

 

[JAmos]

Bumping this back to the top to see if anyone has any new experience with these kits, and see how the others are doing.



Jordan

 

[PKemp]

I have a question here. After talking to Cummins, this engine runs into harmonic destruction between 4700 and 4850 rpms. How are you getting past this?

 

[Forrest Nearing]

I have a question here. After talking to Cummins, this engine runs into harmonic destruction between 4700 and 4850 rpms. How are you getting past this?

easiest way is by not talking to Cummins



there's no magic harmonic explosion point

 

[TravisG]

easiest way is by not talking to Cummins



there's no magic harmonic explosion point

Theres my vote for funniest post of the year.



I know guys running 5k springs, not all of them are from Columbus Diesel. Unless you are pulling or drag racing. I don't think you really need them.