Once and for all - What is stock boost on MK4 GTI?

[blue_reality]

Hi Gang,

I've searched, I've googled, I've asked and I'm getting different answers every time. Can someone tell me what the stock boost is on a 2000 model GTI?

Someone told me 6psi, someone else told me 11, a mechanic told me 7, another forum is 'certain' it's 14!

I thought it was 7psi but I installed a boost gauge and mine peaks at 11psi.

(That's stock except for a full 2.5" exhaust / with dump, and a pod filter. So if it is 7psi, is it possible that an exhaust and pod gives an extra 4psi...)

[bujna]

I'm pretty sure i read somewhere on VW Vortex that it was around 8.7 . It may have been different depending on engine codes though...

Here's the page i found:

http://forums.vwvortex.com/zerothread?id=2666114#29935912

It doesn't specifically list the AGU code specs, but all the 110kw spec engines seem to be listed as 8.7psi

[sierra055]

Prior to Gavin updating the software on my car, it would peak at 11, then drop back to about 9

[h100vw]

VW are pretty good at being ambiguous with their boost figures. The G60 was considered to be serviceable within something like 5 to 9PSI.

I reckon the MK4 is good anywhere between 7 to 9/10 PSI. You have to understand how the boost is used by the engine and also how are you measuring it, is the gauge calibrated?

If you try and get a reading in first or second you won't see as much, as if you ran in 3rd or 4th.

Gavin

[JuicyFish]

Dont mean to hijack.

What brand/model boost gauge do you guys recommend?




Cheers in advance.

[Fizz]

ok after much research on the topic i think i know 1 of the major factors that causes the fluctuation in boost from 1.8T to 1.8T and that would be the actual Wastegate's actuator. I dunno if u guys have heard of this mod or not where u "crank" the actuator to increase or decrease the amount of boost that builds.
http://forums.vwvortex.com/zerothread?id=2901711

look at number 12. cranked wastegate.