I dont have the capability to show a pic but from the info gathered here the 8.3L I am working on has a more aggressive profile. It appears to be the same as a "10" til the first defueling point. The 8.3, instead of a spur, is square for a couple of millimeters then has a "v" and then back to a square. This is referenced from the top down. Might even suggest this is where the "10" got its beginning. I ground it to a "100" with a more gradual defueling slope at the bottom. Does the fuel plate and the AFC housing effect fueling independently?

 

The plate controls all the Fueling. The AFC adjusts Low boost fueling. Allows the fuel to come in sooner/later with boost levels (Responsiveness).

 

AFC controls fuel based on Boost pressure - no Boost, minimum fuel.

As Boost increases, so does the fuel rate as set by the cam plate.

Low Boost fuel rate is adjusted via star wheel

8.3 needs more fuel across the board than the 5.9, so the cam plate is more 'aggressive', but AFC still controls the 'mix'

Just thinking out loud...........................

BTW - my #10 has a 'nike' check half-way up the cam edge - no spurs, kick-outs, etc.
New, rite outta the box.

 

TST has some kits for 8.3's.

http://www.tstproducts.com/index.asp...WPROD&ProdID=3

 

I put the plate back in after grinding and pushed it and the afc housing fully forward. I can tell some difference but not like I thought. At 21,500 lbs. I guess seat of the pants is not a good judge. Power-to-weight ratio sux. Before the plate grind with 20 tons in the bed, on a hill that had been slowing it to 26mph, it topped it at 42mph with just the starwheel turned all the way up and the afc pushed fully forward. GSK tomorrow. Thanks again for the wonderful advice and direction to helpful links.

 

I might suggest to do some research on monitering the exhaust temps. If you gained that much on the hill you talk about, I know you have added some fuel and with that you are most likley going above the rated temps for your engine and I would hate to hear about you losing your engine in a few weeks to a melt down. Goodluck,,Rick

 

I just noticed you do not have EGT\Boost gages - you're playing with disaster while you're playing with fueling rates.

The Boost gage will show you when the power comes in, and most importantly, the EGT gage will show you when to back out of it.

The 8.3 is easily capable of 450hp and 1300ftlbs torque - along with total meltdown.

Word up.........

 

I noticed after my gsk install a hefty increase in egt's.... i'd skip the gsk and get at least a pyrometer... trust me it's cheaper than a motor.....

 

I didnt make myself clear on this thread. The truck was way below specs before I started. It was nowhere near 275hp that it was rated. The starwheel and the afc were fully rearward. The injector pump is new to the truck. It was installed this past winter. There was a time when the truck was pretty stout but thanks to a clogged muffler, bad injectors, and bad injector pump it had been on a down hill slide. Truck was a Tennessee state hwy truck. Im sure it wasnt taken care of. My boss has been having fits with it for 3yrs. I just started driving it 2wks ago and one of the things they wanted me to do is get it up to where it should be. I am no stranger to diesel performance. I have turned up Cats and I own a "stoked" Stroke. I am all too familiar with the value of pyros and manifold pressure guages. I am new to the Cummins arena. Nobody where I live know anything much about the Cummins/Bosch combos. Some know about putting the "buttons" in the larger Cummins. The best guard against high egt's is your right foot . A very large percentage of the power gained recently should have been there to start with. The guages are coming this week. The only reason for the delay is that I thought I had a lead on some out of a wreck. Thanks again.

 

Are you saying that the stock fuel system is capable of 450hp/1300ftlbs? I am more interested in the higher tq numbers. That is what maintains the speed on a hill side.

 

Visit the TST site, if you have not, and check his projected upgrades for the 8.3L.

That power range with the 8.3L is equiv to the 5.9L with a #10 plate at 330hp and 750ftlbs torque.

I'm seriously considering an 8.3L for my 3500 truck for show-and-tell.

My intended point, tho, was gage it or break it, as a specific precaution before working the upgrades.

KnowwhuttImean?