Who's shimmed the regulator?

[COTTS4x4]

Who's done this and did you notice anything? I dont have a fuel press gauge, so if I do it I wont know what psi it comes up to. It looks pretty simple to do, but I dont want to do it if there is a big reason not to. Diesel71 said there was a decent improvement.

I figured I would ask here and hopefully the Frog will give me some feedback also.

Here's the link that Mikey gave me to The Diesel Garage how to -
http://www.thedieselgarage.com/forums/showthread.php?t=21834&highlight=shim+regulator



BTW - :upyours:

If it's a go I'll go unload my assault rifle and stuff the BB in the regulator. :eek:

[heinzboy]

I be shimming.....

[UNBROKEN]

I wouldn't do it without a FP gauge.
Way back when...when this first came out..I was told to use a ferrul from a 1/8" boost line...so I did...then I got a gauge and found out I was running 86 PSI at idle....which is WAY too much for these injectors.

[COTTS4x4]

Thanks Toby.

Hey Rich - Did you switch yours to the BB? How much did it then run at idle?

What are you running now, do you have a complete fuel system on it?

Thanks,
Scott

[PSDPlayer]

Upping the pressure does not provide any more flow. Get a real pump and real lines done. Why kill a stock pump?

[mikeym]

well it smokes more, that tells me theres more fuel.

you gettin a fuel system rigged up or what doug?

[diesel71]

you realy need a gauge to do it right. people that were useing the 1/8 ferrul or whatever were over doing it and causing to mutch pressure and yes killing there pumps. like it says in the thread dont go over 60psi at 60psi you are supplying good pressure and keeping it from droping to or below 45psi:( witch is a no...no... like doug said it dont provide more flow just a pressure increase to help keep it from droping to or below 45psi.::( ..no...no... I have shimmed alot of trucks with good results. useing a gauge will tell you how mutch pressure you have befor and after the install so you keep it were it needs to be:D

[UNBROKEN]

Thanks Toby.

Hey Rich - Did you switch yours to the BB? How much did it then run at idle?

What are you running now, do you have a complete fuel system on it?

Thanks,
Scott

I played with it for a while...finally made my own shim that was right at 58 psi...it took some trial and error though. I got pretty good at taking off that plate. LOL

I do run a full RR system now with a prototype FASS 150/150 pulling from the bottom of the tank through a -8 bulkhead fitting.

[sredish]

haven't done it. at this point, it never drops below 48 on a hard run and varies between 52 and 56 idling and cruising. so, i haven't touched it. i did punch out my fuel bolts when it was the 'cool' thing to do.

[_CH_]

anyone remember what size allen key the bolts take?
ive had the dang thing off 2x before....but now that i want to take it off again none of my allen sockets fit :mad: :upyours:

[mikeym]

ill go check it out and see what it is

[_CH_]

muchos gracias man

[mikeym]

t25

[_CH_]

t25

WTF? well..... that WOULD explain why i couldnt get the allen head in it :eek:

i swear i remember takin it off w/ an allen before :mad:

[mikeym]

WTF? well..... that WOULD explain why i couldnt get the allen head in it :eek:

i swear i remember takin it off w/ an allen before :mad:

lol :D

a 9/64 will work, but may strip out if your not careful

[PSDPlayer]

Does putting your finger over a hose increase the flow?

[_CH_]

it increases the effective pressure while keeping the flow rate ~about the same - and plus (if its a garden hose w/ water coming out) it looks cool and is fun to shoot people with :D


got 2 trucks either shimmed and/or unshimmed..... for those who have a shim in and want it out (or want to put one in to tick off doug :eek: ) something i learned on the second truck: if youre careful you can leave the return line on. But BE CAREFUL if you do it that way

[PSDPlayer]

Its an electric pump with a marginal output. If you increase the pressure you will cut down the flow.

[mikeym]

if youve got a hose shooting water into a bucket, there will be more water in the bucket after a minute if the water in the hose is flowing at 100psi than if it were at 50psi.

like compression, theres a lot more air in a tank at 100psi than there is if its pressurized to 50psi.

[_CH_]

if youve got a hose shooting water into a bucket, there will be more water in the bucket after a minute if the water in the hose is flowing at 100psi than if it were at 50psi.

like compression, theres a lot more air in a tank at 100psi than there is if its pressurized to 50psi.


yes but if its the same hose and the flow rate is @ 2gpm @ 50psi with it shimmed and 2.5gpm @ 40 unshimmed then in that same minute more will flow into the bucket unshimmed than shimmed. it will just flow harder w/ the shim.

granted one of the trucks today got a shim put in, so to an extent (which doug knows more about than me) you have to decide if its better to get the psi or the gpm since you cant get both (that i know of) without a bap (which can fry shit im told) or a fuel system

...... but the hose/flow will still look cooler with your finger over it :upyours:

[PSDPlayer]

if youve got a hose shooting water into a bucket, there will be more water in the bucket after a minute if the water in the hose is flowing at 100psi than if it were at 50psi.

like compression, theres a lot more air in a tank at 100psi than there is if its pressurized to 50psi.

If you pump the water faster then this is true, however if the pump doesn't change then something is creating a resistance to flow to add pressure to the system.

[mikeym]

well maybe its my understanding of the factory regulator that has my reasoning out of whack, as i thought it was the restriction. i was under the impression that there is an abundance of fuel flowing to the regulator, and it regulates the fuel to run at a lower pressure and effective volume than what the system is fully capable of doing. by shimming the regulator, you are increasing the pressure and utilizing more of the fuel that the pump is sending; youre lessening the restriction. while i havent dynod to look for gains, the additional smoke never made me think twice about it...

if this is not correct, then i appologize, but the regulator seems worthless if this is not true...

[PSDPlayer]

Have you thought that since the pressure is reducing the flow that the smoke is comming from the fuel not atomizing properly?

[mikeym]

the injector can only fire fuel one way, thats not being changed. only what leads up to the injector is changed. im no expert, but if you say shimming creates a restriction, thererfore less fuel, i see no way that there could be more smoke from less fuel? considering no other variables have changed?

[_CH_]

the injector can only fire fuel one way, thats not being changed. only what leads up to the injector is changed. im no expert, but if you say shimming creates a restriction, thererfore less fuel, i see no way that there could be more smoke from less fuel? considering no other variables have changed?

i agree with what youre saying, but then my understanding might be flawed as well.

however to answer your question (i think)


Have you thought that since the pressure is reducing the flow that the smoke is comming from the fuel not atomizing properly?

doug..... i thought thats what causes most smoke: fuel not atomizing as it should. which to my understanding means - Caeteris paribus - there is more than can be used - therefore more than there was before (if it smoke more after the shim than before)?

[mikeym]

if you were saying you were gonna reduce the flow of fuel to the injectors, the absolute last thing id expect is to see MORE smoke. that goes against all logic, no?

[_CH_]

indeed

[PSDPlayer]

If you lower the injection pressure you lower the ability to atomize. If the fuel trickles in instead of spraying in as a mist then which one will burn better.

[PSDPlayer]

If your fuel pressure was low to begin with then getting the right pressure is ok, however upping the pressure to just up the pressure is foolish.

[mikeym]

but adjusting the pressure of the fuel leading up to the injector doesnt affect the pressure the injector fires fuel at, does it? i understand what youre saying, i just thought the injection pressure was determined electronically.

[PSDPlayer]

If you smack a nail with a spring under it does it affect how hard the hammer can press down on the nail?

[mikeym]

so youre saying the injection pressure is ultimately correlated to the fuel pressure leading up to it? if thats the case, raising the pressure would atomize the fuel more, not less, theoretically meaning better burn and less smoke.

with the electronics avaliable, it just seems logical that they would control injector firing pressure electronically. itd be much more efficient and consistent...

[6L strokin]

how much/where at did yall get a fuel pressure guage? i think that mine is low and have considered shimming. if i get a fuel press. gauge i most likely will get one in cab...on summit they are like $160. that about right or can you getem cheaper somewhere else? Also...any good way to actually tell your pressures low w/out a guage?
Thanks!
Darin

[PSDPlayer]

so youre saying the injection pressure is ultimately correlated to the fuel pressure leading up to it? if thats the case, raising the pressure would atomize the fuel more, not less, theoretically meaning better burn and less smoke.

with the electronics avaliable, it just seems logical that they would control injector firing pressure electronically. itd be much more efficient and consistent...

No. You are mistaken.