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Old 03-25-2010, 04:12 AM
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fpr shim...

Has anyone ever tested the fpr shim on a dyno? I've had it in mine for a while now, probably about a year or so. I've been playin with my programmer and stuff tryin to get better mileage, took it from stage III to stage I. Could definitely tell a difference. Then last night, I took out the fpr shim. It felt like it had more power with out it! I'm just curious if anyone has any proof of it actually helping.
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Old 03-25-2010, 04:22 AM
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Every truck is diferent some trucks need the extra presure and some do better with out it. The only way to tell is to put a fuel presure guage on it and strap it down and make adjustment till its happy. If you have a stong pump the BB may be to much.
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Old 03-25-2010, 06:19 AM
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Well, I'm gonna run it without the bb for now. I'm also going to put it back on stage III. I didn't mention before, that when I put the bb and the programmer on, I hadn't cut the cat out yet. Don't know if that makes a difference or not. I still want to get a 3" downpipe and cut out my muffler.
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Old 03-25-2010, 06:25 AM
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I've got the stock downpipe off of an '02 7.3, it looks like a 3", couldn't I use it? Might be some unique welding involved, but I think it oughta work, what you think?
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Old 03-25-2010, 06:30 AM
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Might be alot of fab work to get it to fit, tight area on an obs and the sd has all the room in the world to come down. If i am not mistaken the fpr shim is more to improve idle quality and a little quicker throttle response. On a truck that has fuel pressure that is correct or near correct the fpr shim wont do anything and may damage injector O rings
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Old 03-25-2010, 06:40 AM
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Glad I took it off then...

I was looking at the old SD downpipe the other day and it looks like it just comes straight down from the turbo, I was thinking it might be a little long before the bend at the bottom of the truck, maybe I'll play with it one day and see if it'll work.
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Old 03-25-2010, 06:46 AM
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The obs DP comes off the turbo and down along the trans at an angle and doesnt clear by very much ANYWHERE lol. I doubt the SD one will work at all
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Old 03-25-2010, 09:36 AM
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Quote:
Originally Posted by Fordman247365 View Post
The obs DP comes off the turbo and down along the trans at an angle and doesnt clear by very much ANYWHERE lol. I doubt the SD one will work at all
Oh, ok. Well, it sounded like a good idea anyway. I guess I need to stop being so cheap and buy one huh...
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Old 03-25-2010, 03:41 PM
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lol yeah you see them used on here
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