Engine/Transmission (1994 - 1998) 100 Fuel Plate. What Gives?

[Ahopper]

ok so i have been reading in the threads about fuel plates. when i got the truck i ordered a supposedly #5 plate off of ebay. pic below. it has been working fine but i wanted to make my own 100 plate to see if i would get more power. i took the #5 out grinded it stuck it back in and it smokes 5times less!!! but the power seems to be exactly the same mabey just a little smoother why did that do this? is ther something wrong or is it normal?

 

[Ridesamule]

Did you locate the AFC housing in the same location, or is it possible you slid it back farther during the reinstall. This would somewhat account for the loss of pre boost smoke .

 

[Ahopper]

no i put it full forwared right were the old one was

 

[KHelfrich]

is the plate full forward along with the housing cause if either are back farther it will not smoke as much and if all you did was grind at the top then at low rpm it should be the same and allow more fule in the higher rpm



ken

 

[pwerwagn]

You had to have slid something back. Or maybe you cracked the boost line to the AFC and its never seeing manifold pressure, that would cause the foot to never move out of the way. Should see less power too though...



-Jeff

 

[Ahopper]

ok so i rechecked it and i did slid back the afc housing. but now i want to know is the mod i did worth anything it dosnt seem to have done much. what is the difference between the first one i hade and my new one?

 

[Joe G.]

The governor follower moves up the plate as RPM increases. So by grinding off the part you did would have affected power ONLY at the RPM where the follower was moving over the modified part. The other places on the plate (other RPM) would stay the same. If you know what the RPM when the follower is at the modified part then you can tell if there has been any change in power. Modifications high on the plate will NOT change low end power. That's why plate curves are designed by professionals like Joe Donnelly and Mark Chapel. They know what RPM corresponds with what location on the plate.

 

[Ahopper]

so is what i did a bad thing? or am i ok do you think i should just by a profetionaly made plate?

 

[Joe G.]

Not necessarily, but you need to understand what the modifications do so you know what to expect from the results.



I don't have the knowledge of what RPM corresponds to what position on the plate and what the optimum fueling is right for WOT at that RPM. So I'll leave my #5 plate alone. It's pushed forward about 1/3rd. That seems to work for me. Plenty of power for what I want to do without EGT getting out of hand most of the time.

 

[Forrest Nearing]

AFC is probably holding you back...



I really don't see any reason for a plate profile... I like #0 plates... just let the AFC control the fueling

 

[Joe G.]

The AFC goes away after boost gets up to whatever the AFC is set to react to. Then the plate profile controls WOT fueling and the AFC is not in play. If you have the AFC all the way forward, the starwheel turned all the way, and the adjustment screws turned all the way the AFC is disabled so the plate is the only thing controlling WOT fueling.

 

[Forrest Nearing]

The AFC goes away after boost gets up to whatever the AFC is set to react to. Then the plate profile controls WOT fueling and the AFC is not in play. If you have the AFC all the way forward, the starwheel turned all the way, and the adjustment screws turned all the way the AFC is disabled so the plate is the only thing controlling WOT fueling.

unless you've got a real plate that actually allows some fuel... then the AFC becomes the limiting factor... but you can mod the AFC to allow much more rack travel. once that's done, the front plug is your limiting factor...