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744 views 7 replies 5 participants last post by  Speedfrak78 
#1 ·
Newbie here. I have been reading data from this forum and other places.Bought a 96 12v recently just to get that engine. Previous owner apparently didn't appear to take extremely good care of it, so have been shoring up trouble spots.

I replaced air filter with a BHF ( old k@n was extremely dirty as was box), changed oil / filter with Fleetguard filter / royal purple oil , replaced fuel filter ( Fleetguard ).

My understanding of power upgrade progression was 1. gauges 2. fuel plate 3. smoke screw and star wheel adjustments. 4. 4" straight pipe exhaust. then on and on it seems to go.
However I read an article on another site that says to keep my truck from FALLING FLAT ON it's face when trying to get on interstate. ( which seems to be my biggest problem ) is what they call GK4k, which apparently modifies rpm limiter. While I like the idea of my truck going when I press pedal, sounds kinda risky. I am not trying to race anybody just looking for somewhat normal operation. Opinions and data welcome !!! Thanks
 
#2 · (Edited)
Do the 4" exhaust first, then gauges, then tune the pump. I put a BHAF and gauges in and just played with the AFC/fuel plate position. That made a big difference in how it ran and performed, but it takes some time and patients if you really want to get it dialed in. You can get a 3K or 4K GSK (Governor Spring Kit) Some 4k kits are also 3K's you just don't use all the springs in the kit. 4K GSK should get the valvesprings swapped to heavier ones to control valve float.

Your tranny is going to be the weak link once you start going much above stock power levels..just the free mods of turning up the pump can toast a stock tranny

read>http://www.cumminsforum.com/forum/94-98-powertrain/287781-beginners-thread-read-first.html
 
#3 ·
Forget the 4 inch exhaust until you are over 400 HP. It won't do a thing for mileage or performance if the engine is stock or near stock. Gauges first, always, and don't forget the fuel pressure gauge. A 3K GSK will allow you to wind the engine up to 3200-3300 RPM, which is plenty with the stock valve springs. Before you install or mess with the fuel plate put the money aside for a transmission.
 
#5 ·
thanks. Yes I forgot, I HAD the tranny rebuilt with extreme duty parts already . Just did not know of GK4K stuff when started progressing down list. What attracted my attention on the GK4K thread was it solving my loss of power when entering interstate, get to a point foot thru floor and I got nothing !! So I am wondering if I proceed ( fuel plate, star screw, smoke screw WILL the GK4K NOT be necessary ?
 
#7 · (Edited)
The free mods will already be giving you enough power to merge on to the interstate. What did you do to your tranny? Also not sure if it's your auto-correct giving you a hard time but it's "GSK" which stands for governor spring kit. I would not recommend a 4k kit for what you've got going on. If you really want it to run sweet take it to a Bosch certified pump specialist, tell them your goals are, have them bench it and let them set up your pump for you, it will run like a dream and you won't have to worry about screwing up your pump. Just my .02
 
#8 ·
read this also..http://www.cumminsforum.com/forum/94-98-engine/58777-joe-gs-fuel-system-writeup.html

Get gauges on it, at least fuel press. to start and go thru your fuel system. Have you pulled and cleaned the pre filter?

Is your timing still stock? If so see if you can get both pins to line up and see if it's still set correctly, retarded timing will affect higher rpm power.

I wouldn't recommend throwing any performance parts at it until it's running right in it's current form., you could do the exhaust if you wanted, that wouldn't really effect anything.
 
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