• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

More boost?

Bogers99GTP

Bogers99GTP

New member
Just ported and polished my front exhaust manifold, and noticed that the boost gauge at full throttle is showing 7psi. Anyone explain this? Car feels stronger in mid and upper RPM's.
 


What were you getting before the P&P? Someone correct me if I'm wrong but I understand that as you open things up, boost pressure drops due to more efficient processing of air. I saw a slight drop when I had my 3" DP installed and another slight one when I did the P-Log. I was at 12-13 before, and now get 11-12 max.

Oh and it will feel a bit stronger up top. More so with more flow mods
 
DanGTP said:
What were you getting before the P&P? Someone correct me if I'm wrong but I understand that as you open things up, boost pressure drops due to more efficient processing of air. I saw a slight drop when I had my 3" DP installed and another slight one when I did the P-Log. I was at 12-13 before, and now get 11-12 max.

Oh and it will feel a bit stronger up top. More so with more flow mods
Click to expand...

You are correct! When you lessen the restriction on the intake and exhaust sides, you make the engine more efficient. Meaning you're scavaging the exhaust gases much easier than you were before. You're probably about ready for some more goodies now with a tune tweak.
 


He said 7psi at first then he said the stock pulley gives him 6psi. You are wrong. Get back to work!:th_nanana:
 
Don't argue with me!

ok, maybe you should argue with me....for some reason I was thinking he showed a drop in boost.....

More coffee Brian.....more coffee.
 
Could it be that sense his exhaust is flowing out better, his engine is hitting the rpm's quicker pulling in more air to create the extra boost??? Don't really know, just trying to throw some ideas out there and learn about the system more.
 
BADAZGTP said:
Could it be that sense his exhaust is flowing out better, his engine is hitting the rpm's quicker pulling in more air to create the extra boost??? Don't really know, just trying to throw some ideas out there and learn about the system more.
Click to expand...

Well, he is actually loosing boost due to the fact that his exhaust is more free flowing wich means less back pressure.
 


Maybe I got a ghetto gauge..lmao:th_laugh-lol2: The stock pulley is normally 6 psi and has peaked to 7psi before, so i dont know whats going on. The car does feel stronger tho.
 
im guessing the boost will drop more with a u-bend delete. With the decrease in boost, is off the line acceleration going to suffer since the powerband should shift into higher RPMs? Im just trying to keep my 60' times close or better than they are now @ 2.02
 


Yes but remember that you'll spin like crazy unless you have some sticky tires. Hince the reason i stall 1800 to 2200'ish Rpm's or so.
 
You must log in or register to reply here.
Back
Top