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Old 01-31-2008, 02:49 PM
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fpr mod, got question about performance

Hey guys I did the fpr shim with the bb and im not sure if i like the dif or if i can even tell a dif? I mean i am slightley leaning towards the side that my truck isnt as fast with this mod? has anyone encountered this before? Thanks for your help, i been busy with the free mods this week with the bhaf, 15k mod, fpr shim and ordered a 5inch kit from farmboys that will be in friday
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Old 01-31-2008, 08:00 PM
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Take out the BB then and enjoy the power of your truck.

I have only ever herd or experienced a performance gain with the mod but all trucks are different.


Keep Strokin'
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Old 01-31-2008, 08:54 PM
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There is not performance gain by shimming the FPR, anyone that tells you so is deluting themselfs...LOL... It is simply a mod that helps keep the rails full when on higher settings of a chip. Your not adding anymore fuel at each injection event, just keeping some of the air out.

It is not a performance mod...
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Old 01-31-2008, 09:08 PM
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i think it would be interesting to do a before and after dyno run to confirm there is no gain/loss in power.
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Old 02-01-2008, 12:52 AM
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its bound to give you a little boost in hp. higher pressure from the pump means more fuel is gonna get to the injector. so, when it opens more fuel will go into the cylinder which means more power as long as you have enough air. if you were allready runnin optimum fuel pressure then, no you're not gonna see much gain if any. but, these trucks don't run optimum fuel pressure from the factory. i don't know if its gonna help a stock truck, but it did seem to help mine out a little before i lost the stupid spring when it popped out. i can say that it runs like crap without it. well,it runs fine if you don't get on it any. i should have the new one tomorrow to see if it does anything, supposed to raise the fp to 100-110 don't have a gauge yet so i won't know for sure. if you're keepin air out, then what takes its place? more fuel that's what i think anyway, i would like to see it on a dyno

Last edited by wayfastwitey; 02-01-2008 at 12:58 AM.
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Old 02-01-2008, 06:26 AM
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Quote:
Originally Posted by wayfastwitey View Post
its bound to give you a little boost in hp. higher pressure from the pump means more fuel is gonna get to the injector. so, when it opens more fuel will go into the cylinder which means more power as long as you have enough air. if you were allready runnin optimum fuel pressure then, no you're not gonna see much gain if any. but, these trucks don't run optimum fuel pressure from the factory. i don't know if its gonna help a stock truck, but it did seem to help mine out a little before i lost the stupid spring when it popped out. i can say that it runs like crap without it. well,it runs fine if you don't get on it any. i should have the new one tomorrow to see if it does anything, supposed to raise the fp to 100-110 don't have a gauge yet so i won't know for sure. if you're keepin air out, then what takes its place? more fuel that's what i think anyway, i would like to see it on a dyno


Guys... Got to remember how our injectors work... There not like a cummins injector that will inject as much fuel as the tip allows during the injection event... PSD has a set amount of fuel to inject, once it starts firing there is no more fuel getting into the injector until that event is over.
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Old 02-01-2008, 06:56 AM
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The only gain I would think performance wise is if you have your chip on it's highest setting you wouldn't be starved for fuel as quickly. just my
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Old 02-01-2008, 07:20 AM
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well before the shim i could start the truck and drive it, now it has to warm up for about 5 min before i can drive it or it trys to die every time i push the accelerator? guess i will just have to remove the shim...
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Old 02-01-2008, 07:31 AM
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smokeyd, get the shim out of there and see what happens. There seems to be something wrong with your truck. Make sure all of the sensor plugs did not get bumped loose when you did the FPR mod. I would also inspect the plunger in the regulator and see if there is some build up around it and it is not sealing at all, effectivly not holding pressure in the system. There has to be something wrong other than just the BB.
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Old 02-01-2008, 07:36 AM
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I need to do the 15k mod and zoodad but i am not going to do the bb trick cuz i think its a waste of time just my two pennies!
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