Rich's '91 80Q M-TDI

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Re: Rich's '91 80Q M-TDI

Postby scubagli » Wed Oct 08, 2014 2:09 pm

Crushing it!
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Re: Rich's '91 80Q M-TDI

Postby ralleyquattro » Wed Oct 08, 2014 4:29 pm

Why I love diesel!!
Martin Pajak

http://www.quattro.ca

82 Audi Ur-q, SQ project
83 Audi 80 q, Euro 2-Door
85 Audi Ur-q, Euro mit 3B
93 Audi 90 q, 2.5 TDI with 6-speed
93 Audi 80 q Avant, 2.5 TDI with 6-speed
94 Audi S2 Avant, stock
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Thu Oct 09, 2014 1:52 pm

Traveled 820 miles, used 16.7 gal for 49.1 mpg. Next tank should be better as I've been changing the IP timing back and forth during this tank, (yeah, that again) until I found the sweet spot. I drove the car through the woods today on a trail I've been creating for over a year. No diff lock needed in spite of the hilly terrain and the all-season tires. I had to spin the steering wheel back and forth to avoid trees. It was an effin blast.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby scubagli » Thu Oct 09, 2014 6:01 pm

That's great!
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Re: Rich's '91 80Q M-TDI

Postby PRY4SNO » Thu Oct 09, 2014 6:03 pm

Nice results!

Best I've ever had was 500 miles on an 18 gallon tank of 91 octane from Madison WI to Cleveland OH. That was in my stock B6A4 1.8t. Also had a few tanks at 450 miles on that trip.

That said, this thread only adds to my desire for a 6-speed TDI quattro commuter car.
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|| 2010 Golf Sportwagen TDI /// Wifey mobile
|| 1992 80 quattro 20v /// Eventual AAN'd Winter Sled
|| 1990 Coupe quattro /// Because Racecar

|| Spare parts for sale
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sun Oct 12, 2014 10:40 am

I've stopped messing with the pump timing and set it back to .83mm. It runs smooth, cruises nice, pulls hills without effort. I replaced the original Urq vacuum actuator on the rear diff. as the outer boot was torn. It was made in 1982. I put in the original part that came on this car from 1990. I used a brass retaining bolt instead of the steel pin & clip on the diff. lock arm. I'm going make a glowplug timer to extend the glow time during cold weather running. I'll use a simple 3-minute rotary timer and relayed switches to the engine GPs and the 3 coolant GPs. Still need a tachometer and the cruise control finished. I've been running without the fuel pump on and it seems to make no difference. I removed the non-return valve and the eTDI pump return valve I recently re-installed. It's all good now.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby scubagli » Sun Oct 12, 2014 1:47 pm

The lift pump probably has 0 effect on your set up.

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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sun Oct 12, 2014 2:47 pm

scubagli wrote:The lift pump probably has 0 effect on your set up.

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The purpose is for utility and not performance. I installed it to keep the 12mm plunger happy, and for priming with fuel system work. I will use it in unusually hot weather though. I need to install a 3 way switch; on-off-momentary. It's obviously not for high rpm fuelling :-)
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Fri Nov 14, 2014 4:04 am

I have working cruise control now. It had 3 separate problems. I took the stalk switch apart and cleaned the contact surfaces. The vacuum pedal switches were disassembled and the O rings conditioned and flipped over.(no replacement necessary) The vacuum pump was seized, so I used a spare.

Image

I finally put the Stebro on from my other car finally and believe it or not it's quieter now.

Image
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby DE80q » Fri Nov 14, 2014 6:31 am

Any chance of a vid of how a TDI sounds with a stebro attached? I honestly cant even imagin it.
"If you cant find one, make one!"


91 Audi 80q -10vt project
07 Mitsubishi Raider (Dakota in disguise)
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Fri Nov 14, 2014 7:08 am

I'll try to make one later. I will say categorically that nothing sounds as beautiful as the inline 5 making music through it. The 4 cylinder is well; meh in comparison. :-)
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby DE80q » Fri Nov 14, 2014 7:12 am

Haha... So nothing like my 10vt exhaling through it then huh?

I'm still very interested to hear a diesel sound through it.
"If you cant find one, make one!"


91 Audi 80q -10vt project
07 Mitsubishi Raider (Dakota in disguise)
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Fri Nov 28, 2014 8:56 am

DE80q wrote:Haha... So nothing like my 10vt exhaling through it then huh?

I'm still very interested to hear a diesel sound through it.

I'll get to that soon; I need to install the center section also. Related to this, I've come to realize my gutted cat may be contributing to the noise + causing unwanted turbulent exhaust flow. I'm going to replace it and here's a few options:
1. straight pipe
2. diesel cat(new)
3.braided flex-pipe
4. combination of above
Any thoughts or recommendations are welcome. What length and what brand diesel cat? I need to figure that out.
In other news, I've advanced the pump timing to 1.00mm; this is where the power and mileage is. The mpg's drop to 45 at the lower timing settings. Now it starts cleaner, better mileage, and a little noisier. The stock lower engine cover and the padded knee bar on the '91 help some with the sound. I'll keep it at this setting for a tank. Still on the quest for 50 mpg. I set the tire pressures the other day(as everyone should do when the temps drop), 40 front, 37 rear with excellent results. The turn-in has improved and the rear follows well, not quite over steer, just less under steer. This car is a bit lighter than the original configuration and I'd like to get it weighed one of these days.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby scubagli » Fri Nov 28, 2014 11:03 am

I'd straight pipe it and add a flex section, as long as your inspection shop doesn't put it on a lift...that should be safety only, but I know some shops are being shitheads with the new nys inspection regs.
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Re: Rich's '91 80Q M-TDI

Postby DE80q » Fri Nov 28, 2014 11:35 am

I straight piped mine. It helps when your inspection tech also happens to be your best friend though...
"If you cant find one, make one!"


91 Audi 80q -10vt project
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sat Nov 29, 2014 7:12 pm

I've used the same inspection place for 30+ years for a very good reason. They're a Harley Davidson repair shop who were the only ones who would inspect my '65 VW kombi with the glass covered headlights back in the early 80's. I've gone there since and will always. It's one resource I'm truly thankful for. So; that's no problem at all. My title is now for a 4 cylinder diesel as well.

Image
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby ralleyquattro » Sat Nov 29, 2014 8:39 pm

Nice, I also changed my title to 5 cyl diesel. Brilliant!!
Martin Pajak

http://www.quattro.ca

82 Audi Ur-q, SQ project
83 Audi 80 q, Euro 2-Door
85 Audi Ur-q, Euro mit 3B
93 Audi 90 q, 2.5 TDI with 6-speed
93 Audi 80 q Avant, 2.5 TDI with 6-speed
94 Audi S2 Avant, stock
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sun Nov 30, 2014 5:54 pm

I've been troubleshooting a frustrating, intermittent, power/acceleration problem and discovered a very clogged boost line to the LDA. I've been like WTF is it now? Easy fix; using clear tubing now and the boost gauge is tee'd into it the way it was. The oil seems to degrade the silicone boost tubing over time. It was like black smushy slime.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sat Dec 06, 2014 11:50 am

I moved the LDA boost line from the IM to the near the turbo outlet. The boost signal is quicker and stronger at the turbo than after the inter-cooler. Noticeable difference in smoothness of acceleration. Made a small adjustment in the boost valve.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby TopherGrace » Sat Dec 06, 2014 3:15 pm

oil_me wrote:I've been troubleshooting a frustrating, intermittent, power/acceleration problem and discovered a very clogged boost line to the LDA. I've been like WTF is it now? Easy fix; using clear tubing now and the boost gauge is tee'd into it the way it was. The oil seems to degrade the silicone boost tubing over time. It was like black smushy slime.


Yep same thing here rich I found that clear tubing really saves time when diagnosing this stuff. I'm going to use it from here on out on everything I can.
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Tue Dec 16, 2014 9:17 pm

I swapped turbos the other day as part of a methodical process to address a pattern of poor and inconsistent acceleration characteristics. The AAZ based K14 turbo I've been using for the past year and a half is just not working well. I would guess the waste gate isn't sealing, is stuck or something else. The replacement turbo is also a K14 but it's from a VW EcoDiesel which has a different CHRA, smaller comp wheel and stock WG set for 8psi. They look virtually identical but have few common parts. This "new" (from 1992) turbo has 20k original miles and is in perfect condition. The car now pulls strong up to 15psi with a boost valve and has more importantly, a much smoother power delivery. I used this turbo when I first put the car on the road and switched to the bigger 1.9 AAZ K14 when the engine was broken in. It's possible the old turbo never ran correctly the whole time. The waste gate function cannot be observed unless disassembled. I think eventually I will switch to a more modern WG turbo like a GT2052. I swear if I didn't have this car to tinker with I don't know what I'd do; stable cold fusion maybe. I changed the oil today @ 8mos & 4800 miles using Rotella T6. The odometer says 189,500 now, 23,000 since swap.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby scubagli » Tue Dec 16, 2014 9:36 pm

Cool glad to hear.

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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sat Jan 03, 2015 7:06 pm

I'm still trying to break 50mpg. I've been exploring the range of pump timing and narrowing it down. Running up through the gears testing acceleration works against good mileage though. The way to get the best #'s is to stay out of boost and maintain minimal throttle lever position. It's harder in the colder months to get good accurate data. The pump timing is now @ .85mm; it starts and runs smoothly. I bought and installed a programmable wiper relay last week. It came stock in many VWs and Audis just none I've ever owned. It works great.
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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Re: Rich's '91 80Q M-TDI

Postby chaloux » Sat Jan 03, 2015 8:07 pm

Go 50-55mph :)
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01 Allroad 6speed - RS4 clutch, catless downpipes, stuklr tune
04 Jetta TDI - DC stage I clutch/14lb fw
DEATH by rust - 96 Audi A6 Avant 2.5l TDI
GONE :( 87 4ktq - 4 FOX SNAKES
DEAD :( - 1996 S6 mit TDI
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Re: Rich's '91 80Q M-TDI

Postby oil_me » Sun Jan 04, 2015 4:17 pm

chaloux wrote:Go 50-55mph :)

That is what I need to do. After the first 49.1mpg tank I tried to improve on it with timing changes but I neglected to record the baseline timing. My driving habits have been too varied lately for consistent data. I've defined the upper and lower range of timing by moving the pump in .05mm and/or .1mm increments and checking mileage and perceived acceleration. If I have to blow the tires up to 60lbs and duct tape cardboard over the wheel wells this is car getting to 50mpg. :-)
'91 80Q m-TDI DD 51.8 mpg-"the oil_can" http://www.theprojectpad.com/viewtopic.php?f=11&t=1529&start=175
'89 80Q shady 80
'99.5 Jetta TDI RC3e/Shine susp. 47-52 mpg
'85 BMW R80 (exploded diagram) next in line
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