i recently started tuning my greddy profec b. i was tuning for 10 psi. i have a pfc, downpipe and exhaust. i have the poor mans non seq. boost would come on around 3500rpm and hit .7bar(10.15psi) then as it went to 4-4500rpm it would drop to .6 psi ( around 9 spi). im wondering is this normal? i thought boost would hold but it seesm to drop. i was also tuning for sharpness but it did not seem to help all it did was increase boost when i tured it to the sharper side. if anyone has suggestions any help would be appreciated. thanks

 

Not sure about non-seq, but..
What is the condition of your main cat? You can check it by removing the front 2 bolts and shining a flash light in there. if it looks like nice clean honeycomb, mesh then its goodl. If it looks like a clogged shower drain, its bad.

 

i dont think it was the cat .when i bought it, it was in good condition and i havent been driving the car that much since. al, do you think a clogged cat would lead to a drop in boost?

 

could it be because its poor mans non seq?

 

maybe, but i don't think so since it was boosting a solid 8 psi before i turned on the boost controller

 

That was the culprit for me when I had an issue with not enough boost on the secondary as the RPMs went up. Couldn't get enough air out of the exhaust b/c of the clogged cat.

I don't know much about non-seq so that is the only thing I suggest that you might want to check out.

Good luck.

 

ill check it out tomorrow. thanks for the help