How Much Boost

[Jim Vaccaro]

2.75 upper and 2lb lower??

How much boost will this combo make??

thank's

 

[sambandit]

Every car is a little different depending on mods, but I would say 16ish, maybe a touch more....

 

[MALDUCATO1]

i'm seeing right around 15-16 psi with that same combo.

 

[Jim Vaccaro]

I have 2.80 with Long Tubes and Ported Blower and see 16lbs..John (Venumous) sees 15.5 lbs with 275 upper and 2lb lower,,Others post 14lbs with just 2.80..
All useing autometer boost gauges,,,can these gauges be off that much??

 

[Jim Vaccaro]

It is starting to look like my gauge needs to be calibrated..

 

[BlackSabbath]

On a cold night, I see 15 psi with a 2.76 upper, stock lower, non ported Eaton.

 

[CobraBob]

Actual boost depends on a number of factors like air temp, supporting motor mods, exhaust system, etc. I don't personally see any two cars being identical. FWIW I had a 2.80 upper only and made 16.5 lbs. That's with a ported blower. I've seen others with similar mods make 15-15.5 lbs.