Maxed VE pump, for Max Power? whats needed?

[tatkins85]

so i have 5x16's and a 63/68/.91 turbo and want to max the pump out. i can find post that give you the basics but then some pump mods overlap other pump mods? so if i wanted to completely max out this pump for speed and hp what all needs to be done? here is a list of everything i can find to do to the pump but dont know what is needed and what is not needed. this truck is a dd also. (but only about 30miles a day)

Longer smoke screw
power screw
AFC delete
remove spring above fuel pin?
star wheel
adjust low idle screw
remove full throttle screw
ground fuel pin
install 3200 spring

also last time i had the pump apart my starwheel was stuck? got about a 1/4 turn on it and it wouldnd move up or down anymore?
so if im looking for max power is it better to remove the afc or is it better to tune the afc? also i found some of these mods but dont know if they benefit anything so give me some feedback on what is worthless if any? or any other mods needed to be done? thanks for the help.

[Tacoclaw]

so i have 5x16's and a 63/68/.91 turbo and want to max the pump out. i can find post that give you the basics but then some pump mods overlap other pump mods? so if i wanted to completely max out this pump for speed and hp what all needs to be done? here is a list of everything i can find to do to the pump but dont know what is needed and what is not needed. this truck is a dd also. (but only about 30miles a day)

Longer smoke screw
power screw
AFC delete
remove spring above fuel pin?
star wheel
adjust low idle screw
remove full throttle screw
ground fuel pin
install 3200 spring

also last time i had the pump apart my starwheel was stuck? got about a 1/4 turn on it and it wouldnd move up or down anymore?
so if im looking for max power is it better to remove the afc or is it better to tune the afc? also i found some of these mods but dont know if they benefit anything so give me some feedback on what is worthless if any? or any other mods needed to be done? thanks for the help.

The one bolded will delete all the underlined ones. In terms of HP, I gather that doing the AFC delete will allow more fuel, but the driveability will totally suck with big injectors. People can say they can control the smoke with their foot all day if they want, but I've got a tight, functional AFC and I still have to pay attention not to lug it and smoke on people. It's a PITA to have to pay that much attention to the throttle IMHO, but on a performance build it shouldn't matter.

If you're going all out, might as well get the 4200 gov spring and better valvesprings, and I would pull the high idle screw even on a stock truck. The throttle linkage stuff also applies, to make sure you're getting full throttle travel.

[tatkins85]

well im not trying to go 100% all out. im trying to max out the pump with my current mods. dont want to put anymore money into it just want to squeeze all the power out of it with the mods i currently have. so if i didnt want to delete the afc how do you go about adjusting it? or is adjusting the afc considering all those other mods (star wheel, fuel pin, smoke screw)? what does removing the spring above the pin do? o ya and has anyone had the stuck star wheel problem before?

[cmann250]

You're right, the AFC is the smoke screw (controls low/no boost fuel), the fuel pin (controls fuel vs. air), and starwheel (controls how soon or late the fuel comes on). I think that's fairly clear

The spring between the fuel pin and starwheel (what i think you meant to say) is necessary because it pushes the fuel pin up and boost pushes it down. If you took it out, the fuel pin would sit at the bottom of it's bore, likely at its deepest point, and be pretty much useless. You can get springs that have different ratios, either firmer or softer.

[tatkins85]

ok thanks guys. i just spend some time tuning it and go from there.

[ahale2772]

best thing you can do is get a good understanding of what each and every adjustment does, dont touch the pump untill you have a full understanding of what each screw or spring does. once you know 100% you wont need to ask, its just kind of intuitive. they are all designed to make the pump perform how you want it to. the term "maxed" should be reserved for those who actually have run out of things to do...

search around a bit, its all been outlined before, if you still have questions they will surly be answered

[motorwood]

I have no AFC foot, took it completely out leaving only the pivot shaft in place. This made a huge difference in power for me. However, I had never tried grinding the foot or using an aftermarket fuel pin. My fuel screw was all in, linkage adjusted, 354 spring, 4x.015s, 21cm stock housing, 60mm comp wheel, and k n filter in the stock box. 368 up 848 trq pretty cheap. Good for sled pulling. A well tuned AFC with a modded pin will make more power on a dyno especially with a 14mm as flat footing overfuels putting out the fire.

[oldestof11]

If you want all out street-ability, the AFC is kinda essential when you get a big(ger) single turbo or compounds. It helps to tune the pre-boost fueling to help from flooding the charger.

[BC847]

A well tuned AFC with a modded pin will make more power on a dyno especially with a 14mm as flat footing overfuels putting out the fire.

This^^ This also holds very true IMO with the stock/OEM 12mm H/R.

And such is NOT limited to just the dyno.