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Old 03-11-2008, 05:20 PM
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fpr shim

Could you guys explain what this fpr shim is. thanks
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Old 03-11-2008, 05:36 PM
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it increases the fuel pressure at the regulator ( on the side of the fuel bowl) allowing for a little bit of a smoother idle and a slight increase in throttle response. its a fun cheap mod to do to get your truck to run a little bit smoother.
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Old 03-11-2008, 05:50 PM
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Old 03-11-2008, 07:19 PM
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Could you explain how its done?
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Old 03-11-2008, 07:20 PM
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Just noticed you have a 94-97 OBS...

Here is the writeup for it.
OBS FPR Shim and Gauge Install
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Old 03-11-2008, 07:43 PM
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I don't have one but my friend does. Its gutless so I was checkin out what could be done. I did notice that the down pipe is flat which seems to be pretty restrictive.

I don't know if this is with this truck but I heard you could poke a small hole in a tube thet regulates the turbo pressure so that it would think it was putting out less air than it really is. Do you know if this is true?
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Old 03-11-2008, 07:50 PM
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I wouldnt do that, then it actually would be gettin less air because it would get out the hole. look into a map fooler at ITPDiesel.com im not sure if it works for the 94-97 strokes though?
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Old 03-11-2008, 08:08 PM
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Ya it sounds like holes arn't too good. Thanks for the replys!
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Old 03-12-2008, 12:59 PM
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The FPR is a great trick. Our trucks don't have waste gates, so there is no boost control hose to poke holes in. There are better ways to do that on trucks that do have waste gates, though.
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Old 03-13-2008, 08:42 AM
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yup i have a early 99 PS and i had to put a stiffer spring in the regulater it gave me 3 more pounds of boost and runs smoother ive installed a boost fooler on my PS and also removed the wastegate vacum line i stuck it on a boost tube clamp to keep dirt out of it
works great
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