Engine/Transmission (1994 - 1998) governor arm afc & plate how they relate ?

[mjs]

I had look at this closer and it would seem to me that the governor arm would first hit the bottom of the fuel plate and then the afc would hold it down from risen or going forward until the boost is enough to push it out from under and then it would hold between the plate and afc to go up & forward. Does the arm rise by rpms ? Does the arm push further forward then it does when it's in the not running plate out shut off up & throttle full position ? Should the arm rise on the afc first ? does the fuel increase with the rise of the arm to ? One would think by the looks of the stock plate. Sorry for so many questions i'm just trying to make better sence of it all thanks . mjs

 

[mikel]

I had look at this closer and it would seem to me that the governor arm would first hit the bottom of the fuel plate and then the afc would hold it down from risen or going forward until the boost is enough to push it out from under and then it would hold between the plate and afc to go up & forward.

The AFC will stop the governor lever from moving forward, but if everything is installed correctly it will not stop the governor lever from going up.

Does the arm rise by rpms ?

Yes

Does the arm push further forward then it does when it's in the not running plate out shut off up & throttle full position ? [?QUOTE]



I'm not sure I follow this question, but if you're meaning when you have the AFC off the pump and the shutoff arm pulled up and the throttle all the way to full and no plate installed then I'm going to have to say I don't know. Maybe Piers or one of the other experts can answer this.

Should the arm rise on the afc first ?

The governor arm will be limited as to how far forward it can move until the engine builds enough boost to push the AFC foot out of the way. The only thing that moves the AFC is boost, so if the plate is more restrictive at the bottom then the governor lever will rise on it, otherwise the governor lever will rise on the AFC foot, so it will be whatever is the most restrictive of the two.

does the fuel increase with the rise of the arm to ?

Ok, now keep in mind that I'm not an expert on this, but this is how I think it works. Fuel does not directly increase with the rise of the arm, the arm goes up and down with RPM, and generally more fuel will be needed to increase the RPM but again if you're sitting in neutral running the engine to 2000 RPM then you won't be making any boost to speak of and the AFC foot will still be limiting forward movement of the governor arm

One would think by the looks of the stock plate. Sorry for so many questions i'm just trying to make better sence of it all thanks . mjs

Questions are always good, you'll never learn anything if you don't ask.





I hope this helped some,



Mike

 

[mjs]

Thanks mike . I see now that the rize of the governor arm only allows more fuel as the governor arm is allowed to go further forward as it gets higher up the ramp. I would think with good foot control and normal driving that it would be possible to not hit the fuel stop plate at all . Would this be correct ? And the plate profile works as the max fueling at the given rpm foot to the wood. mjs

 

[AMink]

When you look in the pump at the arm and the plate, should the arm touch the plate? When I was poking around, I can move the throttle, the arm comes forward and just kisses the plate, then immediately backs off the plate. I assume that under throttle, the AFC keeps the arm against the plate. Is this correct? Can the arm be set too far back, to the point it won't even touch the plate under throttle? Thanks! Truck's coming back today with a transmission build. Want to make sure everything is working correctly.

 

[mjs]

It seems to me the more research that i had done proved to show that a shade less than full rack travel will yeild more power. Amink your question about the afc . the afc hold back the fueling untill more boost is avalible to burn more fuel . Intern more fuel more boost fuel boost fuel . I call this the snowball efect. Your foot is the only thing to bring the arm ahead . and the plate and afc holds it back untill the rpm and boost become high enough to except more fueling.

 

[WaynesWorld]

governor arm etc

Now the question is how to make the boost come on quicker? :-{}

Is there an adjustment to make boost at about 1,00 rpm?

Inqiuring minds want to know!



WAYNES WORLD

 

[mjs]

If You Have The Afc Lose It Will Fuel Quicker . But I Think What You May Need Is To Raise The Governor Arm Up A Tad On To The Fueling Ramp Of The Plate . You Can See How To Set It On Pdr's Tech Page . But Don't Set It A The Tip Raise It Up Just Enough So It Start On The Bottom Of The Ramp . Also Be Careful Not To Turn It Out To Far It Can Fall Out ! If That's Still Lame Try 1/2 To One Full Turn Out More I Did This With Out Taking The Afc Back Off. Just The Rear Plate And Used The Sop Meter .

 

[JGK]

Now the question is how to make the boost come on quicker? :-{}

Is there an adjustment to make boost at about 1,00 rpm?

Inqiuring minds want to know!



WAYNES WORLD

Yes. Smaller turbo, or at least a smaller exhaust housing. But you already know what the trade off is. :{



The problem is, somewhat like our P pumps as it relates to timing, they are not variable. Every turbo has a range at which it works at its best. You can get big ones that pump a lot of air at higher revs/fueling and create all kinds of power and manageable EGTs, but you sacrifice low end response.



You can get small ones that give you quick spool up down low, but can't handle big fuel at the upper revs without piston-melting EGTs.



Until some sort of affordable, reliable variable geometry turbos or some such comes out, the only solution... TWINS! :-laf



-Jay

 

[WaynesWorld]

governor arm etc

mjs,

I cut my own plate to help fuel better. That brought the rpm down to about 1500 when I reach 10 lbs of boost. It also gave me quicker spool up to reach the 0-60 in about 6 seconds :--) from standing start. I see that adjusting the gov. arm to hit my new step at the bottom of my p[late could make a difference. I will give it a try

But will that alter the turbo response ?



Jay,



I went with the HTB2 with a 62 wheel, a 12 housing that flows like a 14, according to Steve a HTT. This was Steve best low end response turbo set up. The 4" down pipe seems to take care of the top end quite nicely.

The low end, my now locking up in all gears trans & triple disc, NEEDS a lower tq band.

Will twins help the lower end ? Or will I have to wait for the spool up as well?

I made some progress with my home ground plate. Oo. It is shaped similar to a 100 plate but with more gradual rise to the top. I think that a little more refining her will help, too.





Has anyone worked with the home grown plate design????



Thanks,



WAYNES WORLD

 

[mjs]

Waynesworld

How About Timing. I Don't Know Were Yours Is Set ? But Some Advance Can Get Things Moving Along Some If You Don't Have Much Advance Now .

 

[WaynesWorld]

governor arm etc

mjs,



My timing is set at 15 3/4. Should it be higher?? :-{}

Would there be an advantage to more???

Its a daily driver in stop & go traffic. :{

Do you have twins?



Thanks,



WAYNES WORLD

 

[mjs]

Waynesworld

I Would Think Your Timing Is Fine Then . Have You Re Checked It To . I Had Herd Cases Of The Timing Slipping. How About Dv's What Size Are You Running? Mjs

 

[WaynesWorld]

governor arm etc

mjs,



The timing has not been checked after the last setting.

I did get into a phone call with HTT.

They will kick it around over lunch today & get back to me. :-{}

One suggestion that we discussed was more boost. :-laf

I have 42 lbs. now By adjusting the boost say to 45-46 lbs, then check the lag.

I am thinking of another grind on a different plate to see the difference. More on that later. Oo.



Thanks for the suggestion.

WAYNES WORLD