boost / hiss noise (RS2 spec coupe)

[avants2turbo]

yesterday I purchased "stevieyid's" S2 coupe, and im aware its been having problems not boosting as it should be, im sure some of you are aware of the problem/s its been having.

To be honest im pretty chuffed with the performance, and in 1st and 2nd it seems to feel ok, but 3rd - 6th theres some hessitation/flat spots and it doesnt seem to be boosting much pressure (1 bar ish in 3rd-6th ) also something i think may be v.important when the boost guage is showing anything less than 0 (so negative pressure/vacume) theres a very noticable hissing sound thats there all the time, whilst just idling or cruising below 0 bar (vacume) the noise is coming from the inside of the car behind the glove box (ecu area.

Spec of the car is as follows
RS2 Turbo, EM, IC, Injectors, RS2 Homefry (Mr Nugent please comfirm the spec of these) 3 Bar Map sensor

Anyone any ideas what this could be?

[Acidburn]

Take the glovebox out and have a look, check the pipe to the ecu.

also does the car have aircon.

[gavs20v]

yes its got aircon. The blower motor is goosed apparently. Has steve been in there at all and dislodged any of the vacuum lines?
Where is your boost gauge connected into?

[avants2turbo]

blower motor is fecked, yes aircom, will have a look at the vac pipes tomorrow, not sure where the take off for the guage is

[newsh]

When I last looked at the car the 2 pipes to the ecu and the aircon valve had been connected back to front so the ecu was only ever seeing vacuum and the aircon was seeing full boost We reconnected the correct line to the ecu and the car started to drive properly but seemed low on boost, we never did have time to do a proper boost leak test, there is definitely a leak or two IMHO. The car does not boost as it should IMO for a RS2 Homefry.. Also the vac pipe which should connect to the aircon valve was too short and could not be connected so I plugged it with something, sounds like this is now unplugged and you can hear it every time you come off the throttle. There's a one way valve on this line so you wont get a boost leak from it.
Take off for the gauge is down by the ecu too, so before we swapped the pipes over the gauge would only ever show vacuum Steve changed the gauge twice thinking it wasn't working.

[newsh]

[avants2turbo]

When I last looked at the car the 2 pipes to the ecu and the aircon valve had been connected back to front so the ecu was only ever seeing vacuum and the aircon was seeing full boost We reconnected the correct line to the ecu and the car started to drive properly but seemed low on boost, we never did have time to do a proper boost leak test, there is definitely a leak or two IMHO. The car does not boost as it should IMO for a RS2 Homefry.. Also the vac pipe which should connect to the aircon valve was too short and could not be connected so I plugged it with something, sounds like this is now unplugged and you can hear it every time you come off the throttle. There's a one way valve on this line so you wont get a boost leak from it.
Take off for the gauge is down by the ecu too, so before we swapped the pipes over the gauge would only ever show vacuum Steve changed the gauge twice thinking it wasn't working.

with the vacume pipe from the aircon not connected does this mean the air con is not working? should i reconnect it with a longer piece of vacume hose?

[newsh]

Yes you should! Have a look.. I wonder if it is connected now but the boost pressure has killed it and made it leak?? If you want to do a boost pressure test round here sometime I was always going to do this for Steve and the offer is still open.

I guess its the recirc valve thats not connected, ref the diagram above, I think the two vac lines were green and black..

[avants2turbo]

Yes you should! Have a look.. I wonder if it is connected now but the boost pressure has killed it and made it leak?? If you want to do a boost pressure test round here sometime I was always going to do this for Steve and the offer is still open.

I guess its the recirc valve thats not connected, ref the diagram above, I think the two vac lines were green and black..

i assume your based in dorking? what sort of times/days are you available? my missus works in Godalming so i can come via dorking from tonbridge if i drop her off/pick her up

[S2central.net]

I sent you a PM... my bet is air leak inside the ECU.

[avants2turbo]

I sent you a PM... my bet is air leak inside the ECU.

thanks Paul, read and replyed

[Rocco]

I sent you a PM... my bet is air leak inside the ECU.

what where?? the small hose that there is inside the ECU to the MAP sensor??

[Rocco]

are there the same vacum tree for the 3B engines??

[quattro20v]

I sent you a PM... my bet is air leak inside the ECU.

I'd like to know this too, as i'm with similar issues as avants2turbo. Paul, i could use some info on the chips. I sent a PM to you last year you now. :mischeif:

Well, i know you must have a million people to reply. But if you could confirm what is the max. boost i should see with my chips.

[S2central.net]

@quattro20V - send me PM again - sorry - still backlogged there a bit... I cannot remember your setup.