Pro Stock Powerstroke Mustang

Vader's Fury · May 29, 2016

So what makes you suspect problems with the pump?

Cutting-Edge Diesel · May 29, 2016

We can't get the lope out of it and it doesn't free rev right. It's running fine under load but they want to look it over.

WhiteMamba_Scorpion · May 29, 2016

Don't most big mechanical pumps lope until they're under full load? I thought that was just the nature of the beast. Pretty much every pulling truck lopes while spooling... but I will say they don't quite lope as much as your 7.3 does

Cutting-Edge Diesel · May 29, 2016

WhiteMamba_Scorpion said:
Don't most big mechanical pumps lope until they're under full load? I thought that was just the nature of the beast. Pretty much every pulling truck lopes while spooling... but I will say they don't quite lope as much as your 7.3 does

Yes to a point. There is a bumper screw on the back of this pump that dampens the governor arm and will make it idle better.

WhiteMamba_Scorpion · May 29, 2016

Ahh ok. Either way its gonna be gnarly once it's dialed in.

CATDiezel · May 29, 2016

Cutting-Edge Diesel said:
We can't get the lope out of it and it doesn't free rev right. It's running fine under load but they want to look it over.

It's basically the same as thinking: electronic PID LOOP tuning.

The gain is too fast and the proportional is not dampening.

In the case of a mechanical pump it will be in the flyweights. Probably too light or the flyweight a are simply stuck one or the other.

CATDiezel · May 29, 2016

WhiteMamba_Scorpion said:
Don't most big mechanical pumps lope until they're under full load? I thought that was just the nature of the beast. Pretty much every pulling truck lopes while spooling... but I will say they don't quite lope as much as your 7.3 does

That's largely to do because the injector is so big in conjuction to the lack of a BIG timing advance assembly it's next to impossible to control the idle. It's basically fuel on fuel off repeatedly.. the lope. It can be brought under control but not easily. Much easier you control at higher rpm when the weights in the governor have some momentum behind them.

That's going to be the trick to getting this yellow wagon to idle somewhat under control is the perfect balance for weights on the AFr. Too light and they respond like uncontrollably. Too heavy and spool up becomes an issue and he will have a drowning affect once he leaves the line and it shifts one time.

If you will notice a 14liter+ engine does not have the problem of loping and spooling like a "small engine" does. And that's because they have a AFR weight assembly as big as a quart size paint can lid.

CATDiezel · May 30, 2016

CATDiezel said:
That's largely to do because the injector is so big in conjuction to the lack of a BIG timing advance assembly it's next to impossible to control the idle. It's basically fuel on fuel off repeatedly.. the lope. It can be brought under control but not easily. Much easier you control at higher rpm when the weights in the governor have some momentum behind them.

That's going to be the trick to getting this yellow wagon to idle somewhat under control is the perfect balance for weights on the AFr. Too light and they respond like uncontrollably. Too heavy and spool up becomes an issue and he will have a drowning affect once he leaves the line and it shifts one time.

If you will notice a 14liter+ engine does not have the problem of loping and spooling like a "small engine" does. And that's because they have a AFR weight assembly as big as a quart size paint can lid.

Small correction on my own wording. When dealing with the AFR it works in conjunction with the timing advance unit with is dynamic on large engines... more so than small engines. The TA is the more proportionated weights, where a small engine struggles in this area.

Cutting-Edge Diesel · Jun 14, 2016

Last time you will see it yellow

shmoozer · Jun 14, 2016

What have you decide on color wise?

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Cutting-Edge Diesel · Jun 14, 2016

Hot pink

bigrpowr · Jun 15, 2016

Cutting-Edge Diesel said:
Hot pink

i just wanna say congrats, job well done, and we are ALL very proud of what you've done matt. kudos .

Built4tq · Jun 15, 2016

^^^^^ YES INDEED!

Jomax · Jun 15, 2016

Cutting-Edge Diesel said:
Hot pink

NICE!

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Vader's Fury · Jun 15, 2016

If it wasn't for the exhaust, you would swear it was a nitrous car.

Congrats Matt on everything so far. Can't wait to see what the new color scheme looks like.