Boost and waterspray issues

**Juan AR155Q4** · 04-06-08, 23:46

1.5 bar is the limit as Q4 uses a 250kPa MAP (100kPa for vacuum and 150kPa for boost, 100kPa=1bar=14.7psi)

Originally Posted by juamin

Im a little bit confused .
My pierburg definitively is not working . My boost is 9/10 psi at 3500rpm +/- . Now, if i install the manual boost controller and set it so the maximum PSI is 14.5 psi (1 bar). There shouldnt be any problem with that, thats right? . Obviously I cant boost 15 psi at 2000rpm because it will blow up to hell jeje. But if i mantanin the RPM VS Boost , it can be done? .
Suposing that i do this, i install the manual boost control and i set it up to 14.5 psi, the ecu will automatically set the fuel, timing ,etc based on the map, lambda and other sensor readings? . To finish, if i exceed for example, 16 psi, the ignition will cut ?

ECU will set timing and fuel based on MAP reading, that?s why it?ll cut off over 1.5bar, as no info of boost would be given.

OEM boost is set to a peak of 1.1bar and then goes down to 0.8bar

**wrinx** · 05-06-08, 07:36

Thanks for clarifying, quite a margin of safety then.

wrinx

**wrinx** · 16-08-08, 23:05

Originally Posted by juamin

hmm ill try swap them, but i have them connected as the manual says. I also have another pierburg from another Q4, ill try swap them, and see if something changes.

Did you ever sort this out?

wrinx

**juamin** · 16-08-08, 23:19

yes, but after solving that, my cambeld decided to cut jeje

16 new valves , pistons, etc =( (new engine).

The problem was that the intake manifold was loose and that produced loss of boost and strange behaviour. The rest was Ok. the pierburg worked fine.

**wrinx** · 17-08-08, 07:55

Originally Posted by juamin

yes, but after solving that, my cambeld decided to cut jeje

16 new valves , pistons, etc =( (new engine).

Noooooooooooooooooo

wrinx

**AlfaJack** · 17-08-08, 09:52

Originally Posted by wrinx

Noooooooooooooooooo

wrinx

Same thing just happened on Friday to ajcarter!!

**wrinx** · 17-08-08, 10:00

Wtf???? He's not long since replaced all the bets and tensioners...hadn't he?

wrinx

**AlfaJack** · 17-08-08, 11:22

January and not many miles, might have been a foreign object. I saw it the night before at the Ace Cafe. Shame but he has ripped the head off already to start the repair.

**juamin** · 17-08-08, 13:16

My cambelt and tensioners had 10.000 kilometers =( .
I think on tuesday ill have the car finished.

**wrinx** · 17-08-08, 16:47

What caused your failure?

wrinx

**Evodelta** · 17-08-08, 18:04

A bad mechanic....

**AlfaJack** · 17-08-08, 20:34

ajcarter suspects something dropped in to the belt area as the crank pulley has damage on it...and there is no way a belt can do that.

**wrinx** · 17-08-08, 21:07

Yeah, I read his thread on FCCUK, the belt damage appears to back up his theory about a bolt getting in there...looks like it's been holed and/or ripped.

wrinx

**juamin** · 19-08-08, 12:35

in my case , something dropped inside the belt area and destroyed it, we couldnt find what was , i dont doubt of the mechanic because the car was recently bought and i never took the car to his place-

**Evodelta** · 19-08-08, 21:43

The belt has a cover, how does anything get in there?

**juamin** · 19-08-08, 21:49

Originally Posted by Evodelta

The belt has a cover, how does anything get in there?

dont know! i think in the lower part it has an opening. maybe there was something in there from the previous owner ( i bought that Q4 3 weeks before ) and after it broke the piece/part/bolt, whatever it was , went out via that opening. Because the belt has marks like something was touching it .