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.
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07-17-2008
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.
07-17-2008
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
07-17-2008
Stock pulley 6psi....
07-17-2008
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.Originally Posted by DanGTP
07-17-2008
6 psi?
07-17-2008
That's about right with what he may have done to it.
07-17-2008
He said 7psi at first then he said the stock pulley gives him 6psi. You are wrong. Get back to work!
07-17-2008
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.
07-17-2008
YES SIR.
07-17-2008
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.
07-17-2008
Well, he is actually loosing boost due to the fact that his exhaust is more free flowing wich means less back pressure.
07-17-2008
Alright, I can see that.
07-17-2008
Maybe I got a ghetto gauge..lmaoThe 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.
07-21-2008
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
07-22-2008
You shouldnt notice a change in psi with just a u-bend deleate.
07-23-2008
damn your 60' times....im still jelious :/
and i aint got an answer to your question
07-23-2008
isent the stock stall around 3000 tho. so you should still be in mid range power off the line... i would think
07-23-2008
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.
07-23-2008
yea but the stall converter. if you hit it around 1500 or so it jumps up to 3000...
07-23-2008
Yeah... I see what your saying now.
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