Shimming the fpr?

[King0581]

Been reading into this a little and had a few questions. I think i remember reading that it would have to be adjusted when you change your program/chip level. Is that true and also does it make it any harder to start when its cold?

 

[platinum01]

Shimming the FPR helps to send more fuel to the #8 injector. That is comman with 7.3L being under Pressureized. I my self have not done this yet but you do need to have a gauge to monitor the pressure. I have heard that your engine runs better. Forgot what pressure they like to run at.

 

[BIG JOE]

I think i remember reading that it would have to be adjusted when you change your program/chip level. Is that true and also does it make it any harder to start when its cold?

>>HAVING<< to increase the fuel pressure because of a chip/programmer.. is news to me. Bumping FP to 70 psi would >>Enhance<< a chip/programmer though, IMO.

For that matter.. 70 psi Fuel Pressure, makes a Stock 7.3 run better. Quieter too.

 

[95_stroker]

The 99+ SD's really like to run at 70 psi. You wont notice any difference in cold starts, or I should say it wont hinder a cold start and if you decide to go with a chip or programmer later on this too wont be affected by shimming the FPR. Its just all around a good mod to do. And its really really cheap.

I think you might have the 10K resistor mod confused with the FPR mod in regards to the chip/programmer statement.

 

[hheynow]

I've been procrastinating doing it to mine. From what I gather it has no effect on a chip. All it does is insure plenty of fuel pressure at WOT. I'm anxious to see/feel the difference. Don't the OBS and SDs fuel pumps run at different pressures?

 

[platinum01]

70 PSI that's what it is I really need to do this sooooooon. Maybe at the Rally but hopefully before that.

 

[BIG JOE]

It's only 'bout 1 hour Mod guys. There's a DIY with all the How To's & Dont's

 

[JRJ04]

whats the difference between the 10k mod and the fpr mod?

 

[95_stroker]

whats the difference between the 10k mod and the fpr mod?

10K mod is an injection pressure mod, its on the HPO side of the circuit, not the fuel side of it.

 

[95_stroker]

I've been procrastinating doing it to mine. From what I gather it has no effect on a chip. All it does is insure plenty of fuel pressure at WOT. I'm anxious to see/feel the difference. Don't the OBS and SDs fuel pumps run at different pressures?

Yeah Richard, the OBS have a mechanical fuel pump still while the SD is electric. The OBS will like to run a little higher or I should say will tolerate it higher. Much over 70 psi and the SD will eat fuel pumps for lunch. The OBS will run 75-85 psi easily.