Boost drop!

[TDI Power]

My upsoluted A3 Jetta runs 18 psi, but just lately I have noticed at around 3500 rpm flored the boost drops to 15 from 18psi.
Is this normal? Shouldn't it be 18 psi all the way to red line?

 

[runonbeer]

at WOT my stocker golf spikes to 'bout 18 then rapidly falls to 9. as I contiue to hold it, it will begin to slowly climb again.
anytime I'm cruising above 2500rpm and nail it it will pop up to 15 and hold untill I approach redline at which point it drops off steadily.
I'm a stocker and my gauge is propbably not the most accurate thing in the world.

 

[silverback]

Send me a picture of where you guys are putting these gauges. I have the double den radio so I am hurting for space.

 

[WiszMaster]

if you're hurting for space, like i was ... go with the following gauge setup

http://forums.tdiclub.com/showflat.php?Cat=&Board=UBB19&Number=489428&page=0&view=collapsed&sb=5&o=7&fpart=all



I received mine, but have not yet been able to run it - car is in the bodyshop for another week or so.

 

[runonbeer]

HA! I've got a CO2 reg. gauge that I snagged from my brewery and its zipp tied to the broken cup holder

 

[jck66]

Since your original question has been hijacked into "A4-land", I want to return to the topic and reassure you that what you are seeing is normal. My B4 w/Ups holds 15 psi pretty steadily at WOT and only spikes higher. Hope this helps.

 

[TDI Power]

jck66, LOL, I guess the topic did get kind of hijacked. Anyway thanks for reassuring me but does not your chip make 18 psi steady. Mine with WOT from start peaks at 20 psi then settles to 18 and keeps at 18 till about 3500 rpm and then goes down to 14-15 psi. Its almost like the engine is turning so fast and needs more air at that rpm and the rubo just cant give it more. Or the computer just automaticaly downs the boost at such high rpm to prevent damage due to high compression. I'm not sure what it is but I hope it is normal, I dont want to find out my turbo is going or something else like that.