14-05-02, 11:07 PM
Ok all who are running above 18psi of boost what gasket did u use it can't be stock so if it such a great gasket and it holds the pressures with out having to retighten the head after hard driving then please enlighten me. I have bought a copper one from swedish dyn and so far am unpleased with it i have to keep retigtening after running it hard i even put new head bolts in yes and still comes up as a prob!!!
14-05-02, 11:18 PM
right now it is still stock , head has not been off and i have 139000 miles . the last 6000 has been with it hitting 20 psi . i figured on going to the copper one when i have trouble. but..... not sure i want to tighten it every day.
90 900 turbo 20 psi of boost
<font size=-1>[ This Message was edited by: automec1062 on May 15, 2002 3:20am ]</font>
I think that we are all running with stock gaskets. I've run peak boost of up to 25psi and sustained 17-20psi for the last 10,000 miles with no probs.
15-05-02, 11:08 PM
well i appreciate all of your replies yeah my stock one went at 185,000 b/c when i do the head gasket it is around the time of exhaust too so i run it straight pipe for a day or so and that could be the cause of it blowing maybe that and the apc combined?
15-05-02, 11:10 PM
how do you get to 25 psi mine seems to have a over boost protection at 20
15-05-02, 11:13 PM
are you just rechecking the tork or are you having a problem then retighting
Most people either adjust their overboost switch or bypass it! BTW it kicks in @ 14.7psi
16-05-02, 07:00 AM
How are you torquing your head down?, as i dont see how the bolts can come undone after doing them up to the specified torque?
They are done up so tight i nearly gave myself a hernia doing them up.
1st stage 60nm,
2nd stage 80nm,
3rd stage turn 90 degrees.
Is this how you did them?
Im running a standard original equipment new headgasket and like AlanB i run over 1bar boost with no problems, i think you should think about changing back to a normal gasket if you have torqued the head down in the correct method.
As John w said, I simply bypassed the overboost switch. I now use the switch for my external intercooler water spray. Waste not want not.
16-05-02, 08:42 PM
yeah i used the torque settings which copy what u have suggested i know it has suprised me alot that after all that torque that they come loose it is alot and yet it still does? one would think that approx 70ft/lbs would be enough but anyway yeah i might end up going to an OEM el-ring gasket thnks all for input.
Saab also list a thicker headgasket if your head has been skimmed!!
17-05-02, 06:05 AM
All i know is that my torque wrench was not very happy when trying to turn the last 90 degrees, i would say that it was clicking off at around 140 lbs/ft as opposed to 70! (maybe even higher!).
How hard were the last 90 degrees to turn?, i was almost hanging off the front of the car to complete the last few degrees.
As you say i think going back to a El-ring headgasket (what i fitted) is your best bet
17-05-02, 11:34 PM
yeah i don't know what the final torque value is to be i just guessed 72 it could be as high as 100 i hardly doubt it. But even as hard as it was to finish those last few bolts to their final value; which is unknown even to the dealer which says loosen all bolts ans start over when retightening; still found a way to come loose...