The Doc's tranny waggin' Options

[Dr Evil]

Interesting developments. This AM I attempted to adjust the timing as I realized I had not dont this and under load it pings pretty bad. I did this on my way to work....I forgot to pull and plug the vac advance hose so that explained why it got worse. I fixed it over lunch. The timing was right to begin with.

But, it was still detonating under load. So, I tried some octane boost and the noise went away. Crap. I guess I will need high octane after all.

Another interesting thing that has been developing, before I was monkeying around with the timing, is that the bus was stalling when I shifted it into gear. No idea. I adjusted the air bypass for a higher idle and it seems to be doing well now.

With the pinging figured out and treated (for this tank of gas) I can now clearing hear the exhaust leaks (IMG:style_emoticons/default/smile.gif) I am not surprised. I did not paste the header to the gaskets like last time.

The windshield wipers stopped working today, after it rained so yay me. The fairly new Dakota Digital voltmeter has some of the LEDs burned out so it is not readable.

Looking good for Canada (IMG:style_emoticons/default/biggrin.gif)

[timothy_nd28]

Due to the bus requiring higher octane, will this change the admittance fee for the workshop?

[Dr Evil]

Nah, I am about to be a well paid doctor. (IMG:style_emoticons/default/smile.gif)

[worn]

The windshield wipers stopped working today, after it rained so yay me. The fairly new Dakota Digital voltmeter has some of the LEDs burned out so it is not readable.

Looking good for Canada (IMG:style_emoticons/default/biggrin.gif)

So it is like driving my Ford Falcon up hill over Snoqualmie Pass in the snow. Vacuum all used up getting you up the hill, thank you very much. When you close the throttle there will be some for the wipers. But not in a bus I suppose...

Is this a testimony for Dakota Digital?

Residency about over? (IMG:style_emoticons/default/biggrin.gif)

[VaccaRabite]

Dakota Digital will probably fix that for you under warranty if you call them.

Glad to hear its running!

[Dr Evil]

I have been driving it all week. No real issues. It was pinging, I tried mid grade in this helped. I did some reading and found that the vac advance on the dizzy actually tends to cause this. I pulled and plugged the vac line and the bus ran better. It still pings under load above 3.5K so I need to retard the timing a little, I think. I do not like the 3.27 R/P as it places the power band out of reach in 2nd until about 75mph. Sounds weird, but the engine can produce pretty well until I change back in the winter.

As for other parameters, the engine maxed out at 315* head temp in up hill, stop and go traffic with 85* ambient temps. Pretty good. It is just in need of some fine tuning.

[Dr Evil]

Well, I have a few days off and nice weather so I figured it is a good enough time to drop the tranz/diff and change the R/P to a shorter gearing. It is nice to work on a paved, flat surface for once (IMG:style_emoticons/default/dry.gif)

I found a ripped and pissing CV boot so that needs to be addressed while I am in there.

Probably see about getting a custom throttle cable.

Figure out why my oil temp is not registering......

[Dr Evil]

I really hate working on auto trannys. There is fluid everywhere, no matter what you do. (IMG:style_emoticons/default/dry.gif)

I am letting the TC drain.......trickling down.......soooo fucking slowly. Then, I will pull the diff and I can get to business.

A new throttle cable was $4 form BusDepot. The one I have is frayed as it needed to be cut short and has been molested numerous times. It has kinks in it as well so out it comes. I hope to be able to engineer a better throttle pull system in the next few days while working on the rest of this stuff.

[Dr Evil]

I am thinking of growing my tool inventory and being that I have two CIS vehicles and like to tweak with them, and neither is running right, is it a wide band O2 sensor that is needed to adjust these? I am interested in a handheld unit, if so.

[rick 918-S]

No, you need to check the fuel pressure. That is the key to CIS. Search Adjusting CIS. If the fuel pressure is off you will never make any adjustment that will be meaningful using an 02 sensor. I ended up using a Volvo turbo warm up regulator with the guts from my 928 regulator. You need to take a cold reading and a warm reading and adjust the fuel pressure accordingly. The Volvo regulator had an adjustment bolt that my 928 one didn't. You can make them adjustable but it requires drilling, tapping and such. It was easier to just source a Volvo part and change the guts over.

[Dr Evil]

Assuming that my fuel pressure is correct (no idea why you wouldnt), then can I adjust with the aforementioned gauge?

[bulitt]

Not sure if there is a handheld O2 scanner on the market, but don't know? I have owned this meter called a gunson gastester. It worked great. It has a probe you stick in the tailpipe.
You calibrate it in the open out of the breeze, then up the pipe and it will give you AFR digital reading. They sold for @149$ but I see them for 199$ now.
You can use them on any engine, cycle etc.. Up stream of any cats. Wish I never sold it (IMG:style_emoticons/default/headbang.gif) Sure there are some Youtubes showing it.

Gastester link

Innovate sells a clamp to mount the sensor on the tailpipe. So you need the clamp, the wideband kit. Clamp lists for 65$
clamp

[Dr Evil]

That is what I am talking about! Thanks (IMG:style_emoticons/default/smile.gif)

[bulitt]

You find it cheaper let me know I may buy another.

[rick 918-S]

Assuming that my fuel pressure is correct (no idea why you wouldnt), then can I adjust with the aforementioned gauge?

No need. Completely different from modern cars. I could be wrong but my mileage went from 10 mpg to 21 with correct fuel pressure.

[rick 918-S]

What would you adjust? You have an idle screw, a sensor plate adjustment and the fuel pressure. Most guys try to adjust the sensor plate without checking the cold and warm fuel pressure. Bad idea.

[Dr Evil]

I have a 3.0 system on a bastard 3.1 corvair engine. I "know" very little, exactly. I would like to be able to data track. I will check the fuel pressure, but A/F is still important and I may need to adjust the plate. I know the 914 needs the plate adjusted.

[rick 918-S]

http://www.volvoclub.org.uk/tech/fuel_inje...elInjection.pdf

http://www.porsche928forums.com/download/m.../CISRebuild.pdf

http://forums.pelicanparts.com/porsche-911...p-got-pics.html

Totally old school. By the gauges. You will be surprised when you take your first reading.

[scotty b]

I have a 3.0 system on a bastard 3.1 corvair engine. I "know" very little, exactly. I would like to be able to data track. I will check the fuel pressure, but A/F is still important and I may need to adjust the plate. I know the 914 needs the plate adjusted.

That's the least of it's issues..... (IMG:style_emoticons/default/hide.gif)

[rick 918-S]

I have a 3.0 system on a bastard 3.1 corvair engine. I "know" very little, exactly. I would like to be able to data track. I will check the fuel pressure, but A/F is still important and I may need to adjust the plate. I know the 914 needs the plate adjusted.

Without proper fuel pressure any adjustment will only push the engine further out of whack. It doesn't matter what engine the CIS is on. You still need to start with fuel pressure. The fuel pressure acts on the sensor plate. Wrong pressure can't be compensated by messing with the senor plate and a tail pipe sniffer. I tried that and made it worse. The 911 system was designed to run on the same basic C.I. as your Vair engine and therefore needs to be tuned the same.