Do what I said first. 2.88 should be what the multimeter reads. If somehow its not showing that, you can adjust it with a small screwdriver.

I wouldnt be surprised if thats what it is and why vtec doesn't kic in at boost.

Walmart sells a yellow multimeter that i used for $20.

 

The spring is what puts pressure in the diaphragm in the regulator. Over time it becomes weak and isn't as effective. This happens over time and isn't a sudden event.

The spring and a new diaphragm can be purchased from comptech directly, or they will rebuild your regulator for $100.

Either way, verify the fuel pressure first.

 

Sounds like you got one of those bunk counterfeit Walboro fuel pumps. Change this out with a 'known' proper high flow fuel pump. I bet this fixes your problem.

A 4" sos pulley nets 7psi on an ap2 with A/C (with an fmic 4psi?) The CT fpr will handle both scenarios.

 

wow, does the FMIC drop so much boost because it is so effective, or because it's so much more area to pressurize, or prone to boost leaks? Or all 3? I can't imagine it being more effective than an air-liquid unit.

I still think it's the fuel pressure regulator. It must be hooked up to your intake manifold vacuum line. If that line is damaged in any way, the FPR won't work. You're not sharing the line with a boost gauge, right? You really don't want to share this line with anything, as any leaks can be catastrophic.

Also, have you had your injectors cleaned and flow-tested?

The Walbro being "only" a 255 and not a 255HP could cause this, or it's a fake Walbro.

 

Intake manifold vaccum line is hooked up correctly, I'm getting a fuel pressure gauge to determine what's going on. so far- replaced 3.6" pulley with a 4" pulley, checked voltage on esm, checked belt tension, checked all intercooler piping for leaks, now moving onto the fpr and walbro. If fuel pressure comes out low I will buy a new fuel pump, if it doesn't fix it I will get the fpr rebuilt and there is no reason why it shouldn't be fixed then.

 

sounds like a good plan. Just stop flooring it. You're lucky you haven't broken something VERY expensive.

 

The 4.0 pulley would net 8psi on your ap1 with an aftercooler. With the the intercooler though, only about 5-6 psi.

Usually 7 psi is the limit for the regulator, but due to the cooler air from the intercooler 5-6 will max it out.

The intercooler in combination with the comptech regulator seems to make more power than with the aftercooler. Yes a smaller pulley is needed, but unless were trying to max the supercharger, it's not a big deal.

 

This

Its not an efficient method to make the most power out of a Centrifugal Blower, becuase the slight additional cooling ability of the fmic doesn't offset the large amount of boost loss. The fmic is most effective on turbo applications.

 

How do you know if your fpr is bad?

 

But in this situation, using the the comptech FPR, the intercooler with a 3.8 pulley makes more power than the aftercooler with the 4.0 pulley.

But of course with engine management and injectors, it will be better to have as much boost as possible.