What limits the amount of boost?

wrenchman · 09-28-2006, 02:30 PM

I had to install a new inter-cooler on an HP 500 with a M3SC Procharger. The only one I could get was the same model (AW 504) but it had a larger diameter inlet and outlet. After making some adapters it installed exactly the same as the old one. Problem: I noticed the fuel pressure starts to ramp-up even before the gauge shows any positive pressure, and the boost now goes well beyond the 5 lbs. that it used to make.
Could it be that the larger ports on the inter-cooler are causing this change?

SB · 09-28-2006, 03:13 PM

What / where is your boost reference line hooked into ?

ratman · 09-28-2006, 03:28 PM

your wallet

i read where phil lip****z told a customer that the boost gauges was like a bank account when your making boost your spending big coin

or something to that effect.

docmanrich37 · 09-28-2006, 03:33 PM

My wife slapping me in the back of the head saying too fast too fast.

ratman · 09-28-2006, 03:48 PM

did you contact the company you got it from, what did they say they im sure your not the opnly one this has happended to. may be its and improved unit. how much boost are you making now?

tomcat · 09-28-2006, 03:50 PM

The answer is Yes. You reduced the restriction to air flow so more of the compressor discharge pressure is making it to the carb box, instead of being used up fighting the restrictions. Fuel pressure regulator is referenced to the carb box so it is ramping up sooner. Intake manifold boost will increase by the same proportion. All this is accompanied by an increase in air flow and HP. It's all good.

jdnca1 · 09-28-2006, 03:58 PM

How big of a pulley you can get on the bottom and how small of a pulley you can get on top..........oh yeah, and how much you like to pay for fuel......

thedonz · 09-28-2006, 04:36 PM

Quote:

Originally Posted by jdnca1

How big of a pulley you can get on the bottom and how small of a pulley you can get on top..........oh yeah, and how much you like to pay for fuel......

......and broken parts.....

Fountain38SC · 09-28-2006, 06:24 PM

What limits the amount of boost?

Simple anwer: MONEY ONLY MONEY.

SB · 09-29-2006, 07:45 AM

Quote:

Originally Posted by tomcat

The answer is Yes. You reduced the restriction to air flow so more of the compressor discharge pressure is making it to the carb box, instead of being used up fighting the restrictions. Fuel pressure regulator is referenced to the carb box so it is ramping up sooner. Intake manifold boost will increase by the same proportion. All this is accompanied by an increase in air flow and HP. It's all good.

If this is where the pump reference and boost guage is hooked up to, I agree with Tomcat - it provided more effeciency and better breathing to you. Good move !!!

Now, that being said, my boost is limited by the size of my coffee pot.