Timing, EGT's and boost

[MAdams]

I took my 931A2 out for a drive today for the 1st time after some recent mods. I have the pre boost screw turned out 1 turn, the gov springs tightened 3 clicks and yesterday I advanced the IP timing to 14 degrees. The way I advanced the pump was probably not the correct way. I installed the engine timing pin and pump pin, loosened the IP shaft nut and slide the pump back off the taper, then removed the engine pin and with a ratchet turned the motor over 6 degrees using some timing tape as reference. I tightened the IP shaft nut, removed the IP timing pin and fired it up.

The truck ran good but seems to have a little less power now and I am wondering if when I turned the motor over 6 degrees, if I went the wrong way. How bad would the motor run with only 2 degrees of timing?

Also, just for info. This is the 1st trip with a boost and egt gauge. At full throttle I am seeing 21psi and the highest egt's are 1,050 degrees on a 2% grade going 60 mph.

BTW where I located the gauges looks good but you really cant see then while driving.

 

[Ford Mechanic]

Just for comparison, my gov is up 3 clicks, pre boost is adjusted some, and the rate screw is adjusted some. I'm hiring 25 psi boost and letting out at 1150*F on EGT.

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[74M35A2]

As long as you turned the engine backwards, then it should be advanced. It will not be fully 6 degrees advanced unless you went past the 6 say to 10, and then forward back to the 6 mark. This takes the slop out of the gears.

Do you remember which way you turned the engine to change it, vs direction of rotation when running?

Hat's off to you for making a go at it. Can always go back to both pin timing method to restore and/or start again.

 

[MAdams]

Thanks. That's one of the reasons I attempted this, because I knew I could easily go back to the stock 8 degrees. To be honest I cannot remember which way I rotated the motor. I should have been more careful but I was in a rush. Looking back, I had a 50/50 shot of being correct. lol

I can't imagine the motor running well at 2 degrees but I guess I will find out soon. I am going to line up the IP timing pin and pull the engine pin and see if its before or after the sight window

 

[grendel]

The truck will run fine at 2 degrees. It won't make power and it should smoke like a lot lizard at a chimney factory... but it will run.

 

[74M35A2]

That's your new name. I just changed it on my cell.

 

[Ford Mechanic]

I'm watching intently to see if it's worth it for me to advance mine.

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[aziator]

Just for comparison, my gov is up 3 clicks, pre boost is adjusted some, and the rate screw is adjusted some. I'm hiring 25 psi boost and letting out at 1150*F on EGT.

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That is where I am at, except I changed the gov springs for the 3K ones. I see 25 PSI with an occasional 28-30. I get out of it around the same time.

 

[74M35A2]

az your box is full.

Advancing injection timing lowers EGT.

 

[aziator]

az your box is full.

Advancing injection timing lowers EGT.

Fixed. I think timing will be my next mod...

 

[Ford Mechanic]

Fixed. I think timing will be my next mod...

I'm thinking about it too

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[Getagun]

What is the stock boost on the 8.3

 

[Ford Mechanic]

What is the stock boost on the 8.3

Mine is all stock other than turning the pump up. I'm getting 25 psi boost at WOT.

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[MAdams]

Stock boost is probably somewhere around 15-18. The only way to increase boost is to increase fuel delivery aka turning up the pump. These trucks don't have a wastegate so fuel flow is the only method.

 

[Mos68x]

Stock boost is probably somewhere around 15-18. The only way to increase boost is to increase fuel delivery aka turning up the pump. These trucks don't have a wastegate so fuel flow is the only method.

Thanks for that info, I was wondering how to turn up the boost. I can't wait to get my EGT and Boost gauges in on wed, too bad it'll have to wait until the weekend to install them though.

 

[Russ Knight]

Where is the best place to get the EGT and Boost Gauge setup?

 

[Mos68x]

I ordered mine from TMG, bit pricey but not any different than any other kit price, I just wanted the digital look instead of the analog.

 

[quickfarms]

I ordered mine from TMG, bit pricey but not any different than any other kit price, I just wanted the digital look instead of the analog.

TMG?

Who are they

 

[Mos68x]

TMG?

Who are they

Those Military Guys

 

[74M35A2]

Where is the best place to get the EGT and Boost Gauge setup?

Up to you to decide the look and functionality you want. Digital is clear and does not bounce, but with analog you get a better feel of the change rate (how fast it is increasing). Easier to put a warning buzzer on a digital one if you don't think you will watch it closely after turning your injection pump up.