stu.p

just wondering if anybody out there has tried to look into modifying our digital boost gauge(3.3 turbo) on our cars so if you run 1 bar boost then it will actually show it....or is it not possible,is that the maximum figure this gauge has programmed in it to acheive although im sure i seen a post in here with pictures of the original sales brochure for the 3.6 turbo showing the gauge at 0.8?
if this gauge is actually reading boost pressure and not just predicting it at full throttle at certain revs it could be fixed to read the correct pressure,,could it?
does the 930 analogue gauge read 1 bar if the boost pressure is increased??..you would think the 964 turbos are the same maybe but have a transducer just converting it to a digital reading,,anybody know?

JamesE

porsche did it to stop people asking why it was reading more than 0.7 bar when atmos. conditions effect boost presure...

zarpoxx

I have an idea (not tested):

I think if you change the switch of the intercooler (yes, it has a red cap) to a 930 switch, you be able to read until 1 bar.

The reason is quite simple: the 965 switch only reads until 0.7 bar (if you look very close, you read 0.7 in this switch), so if you change this one to a 930 switch (which is able to read until 1 bar, for the same reason) you have to see 1 bar in your display.

I think this is possible because:

1. The clock is able to read more than 0.7. Think that the parcial kilometer (you in milles) is able to read 0.6, 0.7, 0.8, 0.9, 1, 1.1 km....

2. I cant think that the clock has a special Mechanism that ONLY in the bar fuction doesnt be able to read more than 0.7 bar. It is very rare.

3. The simple solution is: If I was be Porsche, and I only want to read until 0.7 bar (because the car only boost until 0.7 bar), I would put a switch that only send a signal to max 0.7 bar.(Yes, if you take off this switch, you can read this: 0.7 bar)

Note: I dont do this test. Please, if some of you know somebody with a 930, take a few minutes and try it!! If this works, ALL OF US to buying a 930 switch!!!!

Bye!!

cobalt

From what I have read Porsche did not want to spend the money to upgrade the software or chip required to read above the .7 bar of the 964 turbo 3.3L engine. When Porsche went to the 3.6 L and increased boost pressure it was not worth the expense since so few cars were being made. Also the 3.6L was more of an interim model that Porsche released as a fill in since the 993TT was not to be introduced to the US market until 1996 and they did not want another long gap of MY's without a turbo model.

From what I know the 993TT's had a slight modification to their units and will read up to .8 bar since the 993TT was a higher production model and had the additional time to work out the bugs. Since Porsche does not recommend boost over prescribed limits they never made it to read above what was the max boost allowed.

With more accurate after market units available for much less than the cost of a new tach I don't think anyone ever saw the value in trying to revise the computer to read higher than it does. I for one wish someone would but to be honest with sunglasses on and driving I can't see what the gage is reading anyhow. I installed an Andial gage in my Side vent. It is out of my immediate line of sight but it is there for the quick reference to check how things are working.

ThunderC4S

It would be nice though if some electronics wiz could work out how to modify the internal software etc. to read to 1 BAR or so.

stu.p

totally agree!!!...maybe not to hard just nobody maybe has tried..

Rainier

I have a chiptuned 993tt my '96. The digital gauge only reads to 0.8 bar, never seen any higher boost level. From what I can understand of the above posts it simply can't display any higher values? Do I just need an aftermarket boost pressure gauge in order to show the exact amount of boost?

I'm sorry for my English, I'm from the Netherlands.

cobalt

Welcome

Unfortunately yes, it is one of those things we all have to live with. There are some units that fit in place of the clock that can be used and Blown Six just came out with a multipurpose unit that actually replaces the clock, tells time and shows all the warning lights the clock does.

Rainier

Cobalt, thank you very much for your reply. I'll take a look for some replacement stuff.

nathanUK '81 930 G50

Your english is excellent.

Welcome to the board.

dholling13

Problem solved. Just go to Andial...

John McM

I don't think they're in business any longer.

BTW: Any reports from those who ordered the blownsix gauge yet?

JasonAndreas

Last I heard Andial was still selling parts they just stopped wrenching. Call (714) 957-3900 and ask if they have AND 631 006 93 in stock.

ThunderC4S

I have an original hardcover Porsche color sales brochure for the 911 Turbo 3.6 (964) which has a close up photo of the tachometer which clearly indicates 0.9 BAR of boost.

I wonder what this is all about ?

ThunderC4S

cobalt

I have the same brochure. I think it was this brochure which prompted the TSB stating that .7 bar reading was acceptable so long as actual values were within spec.

I have the Andial gage and its better than nothing but not the most conveniently located.