Boost pressure

[paulmac]

Anyone got a rough idea what boost pressure i should be seeing on ny aftermarket
boost guage which is in psi
audi s2 aby rs2 spec turbo ,manifold, injectors ,ecu done with homefries

[nip]

Anyone got a rough idea what boost pressure i should be seeing on ny aftermarket
boost guage which is in psi
audi s2 aby rs2 spec turbo ,manifold, injectors ,ecu done with homefries

Is it mapped? If so I ran 25-28 psi

[paulmac]

yep mapped by paul, im seeing 30 psi

[nip]

Yep seems ok

[quattro-nick]

i had max 1.9 bar on my rs2 turbo in the past with 1.6 bar to redline

[paulmac]

The reason I'm asking this is I'm having a bit of trouble with what I can only describe as ignition or fuel cut at 3500'rpm sounds like a flipping machine gun when it does it
And I can not get the car to idle more so when hot, the only way I can drive it is by disconnect the ISV all together and then it runs fine
I have checked for boost leaks till I'm blue in the face so I'm with that
Replaced maf, n75 valve which was leaking, tryed another lambda
No fault codes apart from ISV which is disconnected
The only thing that I have noticed was the wastegate upper chamber does not hold great vacuum and leaks off nearly straight away, thinking diaphragm
That being said any ideas on idle issue any input would be greatly appreciated
I have access to vcds and was looking through measuring blocks but to be honest unless someone can tell me what is the important figures I'm a little unsure
Anyway many thanks in advance

[Michael S2]

What condition are your coil packs in?

[paulmac]

Sorry i have also changed these and funny enough the missfire was worse b4 i did
car would have missfired ar 15 or 20 psi now it missfires at 28 psi

[bazburn]

Happens on mine all the time, albeit not an RS2 turbo, replugging the MAF cures it for me...you may have really dirty connectors or bad connection some other way.

[paulmac]

cleaned conections and even changed maf im wondering if the wastegate diaphram is split would this cause the condition or am i barking up the wrong tree
Not sure what direction to go with this

[newsh]

Boost pressure

A bad misfire at 3500 RPM could possibly be the IAT sensor going bad or poor connection.

If WG diaphragm is leaking you would normally get too much boost.
Too much boost will usually cause fuel cut.

No codes in Vagcom?

[paulmac]

No codes other than ISV valve which is disconnected because car will not idle

[paulmac]

Changed out diaphragm for another I had holding vacuum a lot better dought this is my problem but c what happens next time I drive her

[newsh]

Are you running original coils with POSs or TFSI coilpacks?

[paulmac]

Running oe coils and pos and have tryed another set of coils