Silverr1

Not sure if this is correct. I'm reading about 10.5 psi using the Torque app on my Android phone. This is pretty consistent at WOT.

My mods include LT EC headers, primary and sec cat deletes, x-pipe. Still have stock resonator and mufflers.

I've read that less exhaust restriction will result in lower boost pressures. I've read for a VRP 175mm pulley the boost rises around 4psi to around 14.2psi. Just curious is 3.7psi drop is inline with my mods.

thx

AWOL

That seems a little excessive

GT-ER

That doesn't sound right. Your mods are nearly identical to mine and I see 13.5-14.5psi depending on the revs. My pulley is slightly larger ( 178mm ) but a 2mm difference in pulley is barely noticeable.

urbamworm

Here is a log with "180" asp pulley which is actually 178mm where the belt rides. Kleeman headers, no cats and exhaust.




EDIT: Log is from the man above.

Silverr1

Here is a quick log from mine.

Silverr1

Where should start looking? Belt, clutch? Any common areas where leaks happen?

thanks in advance

I Like Soup

Maybe the app?

GT-ER

What are the numbers in the columns? Where are the RPMs?

skratch77

The torque app sucks for logging boost

Silverr1

I attached another one from today with the labels. I also included the MAF which reads 422 g/s which work out to .94 cfm or 26.624 lts/m. I also checkout my vacuum at idle and it's steady 20 inches of vacuum. I hope some of this data helps.

GT-ER

Sorry but those logs don't seem to make much sense. I think it's your logging application that's not right.

splinter

Stock vs. 178:


image credit Marcus Frost

adianaty

Agreed. I haven't had good luck with it either. Try using intake manifold pressure since the vacuum/boost option has been problematic for me too.

Silverr1

Did another run using manifold pressure and got up to 26.4 psi or 11.7 psig. A little better but still not what others are seeing. Maybe just not the best logging tool.

BRABUS786

hey

My 190mm pulley made 1 -1.1 bar boost
Around 14.5 to 15.7 psi

acid