defueling - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 4 (permalink) Old 02-08-2009, 04:22 PM Thread Starter
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defueling

i know mines an obs, but my chip is off at tony's and i noticed yesterday it defuels at about 36 psi of boost w/ stock programing. thought it was cause i was doin it at half throttle, but when i push it to the floor it still defuel just not as bad. the 2.8x2.8 w/ 19 housing spools at least as fast as a stock 2e w/ 17 housing at least w/ my mods. i love it. i did have 50psi of back pressure at that 36 psi but like i said it was defueling. so not sure on drives yet. increasing boost and leaving the ex. side the same should not make back pressures higher should it?

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post #2 of 4 (permalink) Old 02-08-2009, 10:03 PM
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Re: defueling

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Originally Posted by powerstrokenstang View Post
i know mines an obs, but my chip is off at tony's and i noticed yesterday it defuels at about 36 psi of boost w/ stock programing. thought it was cause i was doin it at half throttle, but when i push it to the floor it still defuel just not as bad. the 2.8x2.8 w/ 19 housing spools at least as fast as a stock 2e w/ 17 housing at least w/ my mods. i love it. i did have 50psi of back pressure at that 36 psi but like i said it was defueling. so not sure on drives yet. increasing boost and leaving the ex. side the same should not make back pressures higher should it?
That much boost is freaking your map sensor out and the pcm is seeing crazy stuff and pulling back the fuel. The pcm on our trucks calls for max fuel on a stock burn @ around 22-24 lbs. You can do a boost fooler cheaply and have adjustibilty by using an air compressor regulator in the map line. Hook it up to a compressor, block off the outlet end with your finger and adjust it to 22 lbs to start and see how it runs...





Also, the pcm goes crazy when the signals for the exhaust back pressure sensor is @ big poundage, if yours is still hooked up, remove the tube from the manifold and plug the manifold. That sensor will only see atmospheric pressure then....

Jim

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post #3 of 4 (permalink) Old 02-08-2009, 10:27 PM Thread Starter
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Re: defueling

i will unhook the ebp sensor. it never has done this when runnin a chip, would it be worth while to do the boost fooler deal. i mean now it actually acts like it hits the rev limiter it defuels so hard. i have never felt this w/ the chip even at 42 psi and 55 psi of back pressure.

1996 F-250 ex-cab -D60- Motor,fire hoses-Nate,Tuning,Cam-Matt R,P-rods,dummy plugs-Wipe Out,Huffer-Engineered diesel,Carson,Gen3,Idm-Swamps,Rods,studs,fire rings-WOP,Clutch-Valair
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post #4 of 4 (permalink) Old 02-08-2009, 10:36 PM
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Re: defueling

Mine does it at around 33 psi. I would put the regulator in but then again if it doesn't do it with the chip in it might not be worth the $20.
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