VDO Tell Tale Boost Gauge

[Rawknees'Turbo]

Originally Posted by RarlyL8

Why are these things so expensive? It's just a crappy simple boost gage, more toy than useful.

Agreed - the prices I see are absurd for such a remarkably simple instrument - can't believe anyone pays that, butt each to their own.

[JFairman]

Mine's always worked perfect.. I have small compressed jpeg pics of the insides and just tried to upload them but could not do it

WHY did they change the picture file upload format that worked fine before?
I can't figure out how to upload pics anymore and this really f____ pisses me off.

It worked perfectly before and was so easy.. Who ever changed this has too much free time and can blow it out their shorts.

and...
I think they are very well made gauges. The original VDO ones were good enough for all the 935's and 962's that beat every other IMSA car out there for years, but maybe some of the recent ones made for street cars are too tight or too loose in the tell tale needle clutch assembly built into the center of the plastic lens.

[356911930]

JFairman,

We get set in our ways and when someone changes something for no apparent reason it drives me nuts too!

I like them so much I have two of them. One I got for free about 26 years ago and the other I got about five years ago I had to pay for. Luckily I got them before the prices went thru the RUF.

Rahl

[JFairman]

Free VDO boost gauge... very nice!

Mine was in the car when I bought it and somebody had been into it before when they installed off white NHS instument bezels to go with the off white linen interior in the car.
Doesn't look as good as the original black bezels but I'm OK with it and the instruments are easy to see and read quickly at night with the original dim bulbs in them.

[Dwerkz]

Originally Posted by 356911930

Dwerkz,

I put a brass "T" fitting in the line from the bottom of the Throttle Body to the WUR. then ran another line from the "T" down the top of the transmission to the shift linkage tunnel and up to the front of the tunnel under the dash.

Picture bight be upsidedown?






Rahl

Thanks Rahl for the explanation.
So i am wondering do i get a better reading by running a line both from the intake and W.U.R?
Got i also a explanation running a line trough a adapter behind the electric sensor on the front,wich looks tempting to me.

[kevin930t]

Originally Posted by JFairman

Free VDO boost gauge... very nice!

Mine was in the car when I bought it and somebody had been into it before when they installed off white NHS instument bezels to go with the off white linen interior in the car.
Doesn't look as good as the original black bezels but I'm OK with it and the instruments are easy to see and read quickly at night with the original dim bulbs in them.

I have the same white faces,did porsche ever make white gauges or do u think they are covers??

Sent from my SM-N910T using Tapatalk

[kevin930t]

And i will take the free gaige haha

Sent from my SM-N910T using Tapatalk

[krasuskyp]

I used to run one too, it needed rebuild - was lethargic to register the boost signal until sufficient boost moved the needle, and the tell-tale spun freely. It also had the most annoying high pitched rattle @ idle... Chinese Water Torture.

I think I paid $250-300 for it - but that was many moons ago.

I traded it for some bits and an NHS gauge - I'll never need a 2bar gauge and having VACUUM on the readout is way more important to me.

The NHS gauge unfortunately has the same high pitched rattle at times. Lame.

[JFairman]

Paul, there's an easy way to stop the weird gauge rattle. You make a little air flow resistance damper and stuff it in the hose.

I took a 1" long piece of 10 gauge wire or whatever thickness it was that fit snug in the vacuum hose. Then stripped a 1/4" of insulation off one end and pulled some of the copper wire strands out with needle nose pliers but left most of them in there so there would be enough room for some air to move by the copper wire strands but still have some resistance to air flow through the piece of wire. Just enough to slow down the movement of air in the hose a little bit.

I stuffed it into the hose at the end that goes on the gauge while sitting in the car and it worked! The gauge needle still climbed up as fast as before when boost came on and there was no more faint gauge rattle at certain low RPMS and throttle position/intake manifold vacuum scenerios.

You could do the same thing with a little piece of cotton and stuff it into the hose with a phillips head screwdriver or small bolt and it would probably work just as well when you got the right amount of cotton in there.
Stuff too much in and it might slow down the gauge movement too much. Then you'd have to blow it out with compressed air to get it out and try again with less cotton.
Try it, I think you'll like it!

[356911930]

[QUOTE=Dwerkz;9460154]Thanks Rahl for the explanation.
So i am wondering do i get a better reading by running a line both from the intake and W.U.R?
Got i also a explanation running a line trough a adapter behind the electric sensor on the front,wich looks tempting to me.


I believe the more accurate reading is taken from port at the bottom of the throttlebody which runs to the WUR. That is the line I "T" off and run up the tunnel.

I think you are considering a "T" at the brake booster? Which our early cars do not have. I am not familiar with another location to get boost input to the gauge on early 930.

Rahl

[356911930]

Dwerkz,

Your engine looks very clean! Have you coated(painted) the aluminum with anything or just left it bare?

Rahl

[krasuskyp]

thanks Jim

now that I read that I realize you've told me that before, just never got to it (anything lately lol - busy drivin it)

[Dwerkz]

[QUOTE=356911930;9460964]

Originally Posted by Dwerkz

Thanks Rahl for the explanation.
So i am wondering do i get a better reading by running a line both from the intake and W.U.R?
Got i also a explanation running a line trough a adapter behind the electric sensor on the front,wich looks tempting to me.


I believe the more accurate reading is taken from port at the bottom of the throttlebody which runs to the WUR. That is the line I "T" off and run up the tunnel.

I think you are considering a "T" at the brake booster? Which our early cars do not have. I am not familiar with another location to get boost input to the gauge on early 930.

Rahl

Ok thanks.
Brake booster is not there for 75/76,only 77 up.
I have 2 options now,so that will work out.
Its nice that the airline is there already trough the tunnel,i think Porsche put that line there already for chassis that went to be a 934 as there was never a standard boost gauge in the first 2 years.
Yes the engine is clean the cases where special cleaned whit out taking off the protection,the intake was tumbled and treated whit a Dow treatment to avoid corrosion.
Dave

[356911930]

[QUOTE=Dwerkz;]

Its nice that the airline is there already trough the tunnel,i think Porsche put that line there already for chassis that went to be a 934 as there was never a standard boost gauge in the first 2 years./QUOTE]

I'm not familiar with an airline in the tunnel. Do you have a picture?

Rahl

[Dwerkz]

Can not think of a other use as for the boost line,nearby paddle-box inline.



Outline,the small one on the left.

[93097004xx]

Originally Posted by Dwerkz

Can not think of a other use as for the boost line,nearby paddle-box inline.







Outline,the small one on the left.

This very interesting. Are you saying there is a vacuum line factory installed by the pedal assembly?

I guess I'm confused as to where this line starts and ends. I can make out in your picture the center tunnel but the first picture I can't place where it is?

[voitureltd]

Homologation required this on the production 930?

[Dwerkz]

Originally Posted by 93097004xx

This very interesting. Are you saying there is a vacuum line factory installed by the pedal assembly?

I guess I'm confused as to where this line starts and ends. I can make out in your picture the center tunnel but the first picture I can't place where it is?

Its peeking there in the background..

[panzerfaust]

anyone have a non operative or broken vdo tale tail boost gauge (like the ones posted) they want to part with? im looking for parts.

[356911930]

Originally Posted by Dwerkz

Its peeking there in the background..

I checked the tunnel end on my car and it looks like the charcoal canister may have been connected to it at one time. Not for sure.

Rahl