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Adjustable pressure switch has 100% solved the problem. The adjuster has a 3mm allen key head and is very tight so no risk of vibration changing adjustment. I set the switch to 1.5 Bar, took the car for a drive and no overboost tripping.
So this device is half the price of a new Porsche switch, is fully adjustable between 0.2 and 2 Bar and has the same 10mm thread. I used a washer with an internal rubber seal which you can see in the photos.

This looks a good option for 930 drivers

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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust
previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931

Last edited by carrpet; 04-05-2021 at 05:47 AM..
Old 04-05-2021, 12:17 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #161 (permalink)
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Originally Posted by carrpet View Post




Adjustable pressure switch has 100% solved the problem. The adjuster has a 3mm allen key head and is very tight so no risk of vibration changing adjustment. I set the switch to 1.5 Bar, took the car for a drive and no overboost tripping.
So this device is half the price of a new Porsche switch, is fully adjustable between 0.2 and 2 Bar and has the same 10mm thread. I used a washer with an internal rubber seal which you can see in the photos.

This looks a good option for 930 drivers
Excellent! Do you have a link? I'd like to order one.
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 04-05-2021, 05:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #162 (permalink)
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Originally Posted by flightlead404 View Post
Excellent! Do you have a link? I'd like to order one.
https://tameson.co.uk/measurement-control/pressure/pressure-switch-and-transducer/pressure-switch/psl-b-n-0p2-2-c-fp-0p2-to-2bar-nc-brass-pressure-switch-m10-42vac-dc-flat-connector.html

Remember you have to provide ground to one of the terminals. I used my MS ground post (not the sensor ground).
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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust
previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931

Last edited by carrpet; 04-07-2021 at 10:41 PM..
Old 04-07-2021, 10:37 PM
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You set yours at 1.5 bar. That is a long way beyond the factory 1.1.
It would be nice to know it could work at 1.1 reliably. I think you posted something earlier about variations around that mark?
Just that it is a protection switch. And pressures at 1.5 bar are a lot higher than 1.1.
I am keen to get one if it will work in tight limits.
Regards
Alan
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83 SC, 82 930 (track) - Stock except for RarlyL8 race headers, RarlyL8 Zork, K27-7006, 22/28 T bars, 007 Fuel head, short 3&4 gears, NGK AFR, Greddy EBC (on the slippery slope), Wevo engine mounts, ERP rear camber adjust and mono balls, Tarret front monoball camber adjust, Elgin cams, 38mm ported heads, 964 IC. 380rwhp @ 0.8bar Apart from above, bone stock:-)
Old 04-08-2021, 12:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #164 (permalink)
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Great response from Mike at Tial. I am sure he won't mind me sharing this as it is a positive helpful response and explains a lot !

It does make me think that Flightlead404 might be running boost pressures well above 1.0Bar as I found ! I am now running a 0.7 Bar spring which is delivering static opening (cracking) pressure of 1.0 Bar, to be on the safe side !!

Attached are Static Testing Instructions for our wastegate products, along with a chart establishing those test values. Those values differ from the boost pressure values that are published, as static testing is, well, it's static, so there's no exhaust manifold pressure applied to the valve face.

There's also a companion video that can help with this: https://www.youtube.com/watch?v=jn3Sa1iY4Vw

Our boost pressure ratings are designed around the assumption of an equal ratio between intake manifold and exhaust manifold pressure, and this can sometimes (quite often) vary, and that's not the sign of a problem, it's just the dynamic nature of an engine. Since our units are used in many different applications, with different states of tune, displacement, turbochargers, etc., we choose to use the 1:1 ratio as the basis for those spring rates. If that ratio varies, the actual boost pressure will skew in the opposite direction of the variance.

Keeping this in mind, a "1.0bar" wastegate will always begin to open, during static testing, at a higher pressure than that rating. Based on the chart in the attached, one can expect something along the lines of initial opening to occur at ~19.1psi, or around 1.3bar. Keep in mind that the values in the chart are also subject to a small amount of variance, and test accuracy can also provide some variance.

All of this aside, assuming that the wastegate functions as designed and meets the specifications noted in the attached, if the 1.0bar spring in your specific F46 unit is resulting in higher boost pressure, this is more than likely the result of a variance in that ratio I mentioned above, and would suggest that EMAP is slightly lower than MAP, which would skew the boost pressure higher than the rating. If that variance can be quantified, then simply reducing the spring pack value by a corresponding amount should offset that variance. Based on just what I've read, this could be as simple as removing the 'small red' spring, but we do also offer other springs, and I've attached that sheet as well for your reference.

Of course, if the wastegate does not function as designed and doesn't meet the specifications in the attached, let's discuss further.

Best Regards,

Mike Franke-Technical and Sales Support Specialist
TiALSport, Inc.
450 S. Shiawassee Street
Owosso, MI 48867
Office: 989-729-8553, ext 118
Mobile/Direct: 989-494-7268
Web: TiAL Sport
Email: mfranke@tialsport.com
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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust
previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931

Last edited by carrpet; 04-08-2021 at 05:40 AM..
Old 04-08-2021, 05:24 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #165 (permalink)
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Quote:
Originally Posted by Alan L View Post
You set yours at 1.5 bar. That is a long way beyond the factory 1.1.
It would be nice to know it could work at 1.1 reliably. I think you posted something earlier about variations around that mark?
Just that it is a protection switch. And pressures at 1.5 bar are a lot higher than 1.1.
I am keen to get one if it will work in tight limits.
Regards
Alan
Hi Alan,

I have tested 3 Porsche switches using my static rig and I have double checked gauge calibration which is spot on.

The 32 year old switch which came off the car was tripping at 1.25 Bar. The other 2 were new switches which were 1.2 Bar and 1.1 Bar which have been returned to Porsche. I assume the old switch started life at an even higher tripping pressure and the spring has weakened over the 32 years. So the gap isn't quite so big.
I do plan to bring it down to 1.4 bar.

The new adjustable pressure switch was highly adjustable in very small increments and had better hysteresis (5%) than the original switch (10%) . It looks better engineered and is more substantial. I think it is a much better solution !

Peter
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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust
previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931

Last edited by carrpet; 04-08-2021 at 10:43 PM..
Old 04-08-2021, 05:36 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #166 (permalink)
 
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My intention is to take a belt and suspenders approach. Because I'm using the MS to control ignition I can us its "soft" overboost protection and retard ignition at 1.0 bar so I'd set this higher to totally cut fuel at that setting.
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 04-09-2021, 11:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #167 (permalink)
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Quote:
Originally Posted by flightlead404 View Post
My intention is to take a belt and suspenders approach. Because I'm using the MS to control ignition I can us its "soft" overboost protection and retard ignition at 1.0 bar so I'd set this higher to totally cut fuel at that setting.
I am planning "soft" protection too by getting MS to drop my CDI+ yellow lead to earth at 1.1 Bar to deliver a 10 degree ignition retard. I am awaiting a FW mod from Jonny Hart at Classic Retrofit to enable this.

Regards

Peter
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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust
previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931
Old 04-09-2021, 10:56 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #168 (permalink)
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Quote:
Originally Posted by carrpet View Post
I am planning "soft" protection too by getting MS to drop my CDI+ yellow lead to earth at 1.1 Bar to deliver a 10 degree ignition retard. I am awaiting a FW mod from Jonny Hart at Classic Retrofit to enable this.

Regards

Peter
Super cool they are doing this. Options, options, its great to have options!
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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 04-10-2021, 06:54 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #169 (permalink)
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Originally Posted by flightlead404 View Post
Super cool they are doing this. Options, options, its great to have options!
My next potential "option" is to install an AEM Truboost boost controller to manage my boost level upwards using my 0.7 bar spring. I went for a test run yesterday and didn't get north of 156 kpa on the 0.7 bar spring which sounds about what you would predict ?
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1989 930.66 G50 Convertible - Grand Prix White, K27 7200, Fabspeed Long Neck Intercooler, Microsquirt eWUR & Bosch AIV (AAV retiral), Tial F46P 1.0 Bar, Air Pump delete, Fabspeed twin pipe exhaust
previous Porsche's - 2008 997 Carrera S4, 1988 928 S4, 1983 931
Old 04-13-2021, 10:50 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #170 (permalink)
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Quote:
Originally Posted by carrpet View Post
My next potential "option" is to install an AEM Truboost boost controller to manage my boost level upwards using my 0.7 bar spring. I went for a test run yesterday and didn't get north of 156 kpa on the 0.7 bar spring which sounds about what you would predict ?
Unfortunately you can't control boost with the MS without a throttle position sensor. It was my original idea to do EBC but for simplicity I've given up on that.

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'86 no-sunroof 930 coupe: Emissions removed, FrankenCIS controlling eWUR, lambda, COP ignition. Tial f46P 1.0 bar spring, SC cams, K-27/29, lightweight clutch, TK Longneck intercooler, RarlyL8 headers and dual-outlet hooligan
'14 Jaguar XK-R: Bullet proof windscreen, rotating number plates (valid all European countries), martini mixer, whatever you do don't press this red button!
Old 04-15-2021, 10:05 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #171 (permalink)
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