Plenums And Boost Control

[Tree Monkey]

I was looking at fitting a plenum befor I had my car tuned, now have just been lead to belive that once you change to an aftermarket plenum you have a great deal of trouble controling boost, unless you mod the turbo flapper ect. How manny others have found this? And is this mod on a stock ba bottem end a bad idear? I was more looking at creating around 350rwkw at a lower boost level as apposed to max power.

[rapidchris]

I have a nizpro plenum and havent moded the turbo. run 380rwkw on the big tune 17 psi. and 345 on my daily on 15 psi. have a profect b aswell.

[Geeseman]

you can fit one ok, but there is no need with the stock turbo as it won't make any more power.

[Guest]

A plenum will make the same power if not more on less boost regardless of the standard turbo still being in place.

Going by what you're saying Geeseman, 90% of people on this forum with aftermarket plenums including myself have wasted time & money because we still have standard size turbos??

[jetute]

you can fit one ok, but there is no need with the stock turbo as it won't make any more power.

but would it be fair to say that you can make the said power with less boost??

[groper]

I fitted the plenum and cooler before getting tuned... no problems, if it overboosts itll just go limp mode, no big deal... just dont get into it too much before you get tuned and youll be fine...

as for the plenums making more power, they do on less boost, but only by a fly sh*t,,, like 10rwkw or somthing... or maybe .5psi of boost...

[RAP1D]

As an example of a posible scenario... I fitted one yesterday, along with my usual cooler/4incn intake/hot & cold piping... on the 8psi generic tune it hit 17psi on the dyno befor tuning... so without any wastegate enlarging it would be hard to keep boost down and flat