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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old July 17th, 2017, 18:47   #16
AndyBees
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When my ALH Vanagon Turbo goes to "limp mode" it will not fall out of a tree! The Turbo boost gauge will actually show a bit of vacuum when revving the engine while in limp mode.

In this Thread, part of the project pieces would be good to have on board during a long trip in the event the Turbo blew, such as the bolt to block off the oil-feed steel line port at the oil filter.

Seems there was a Thread about someone trying to limp home going from Texas to Colorado with the Turbo gutted....
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Old July 18th, 2017, 09:16   #17
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When I was helping my friend buy a daily beater wagon, the owner said the turbo broke. I have my spare vnt15, so we got the car. Turns out we had to make sure the actuator was stuck. Anyways, while the turbo did nothing, my friend drove his n/a(kinda) and hated it. Partially because he's used to driving a high revving n/a 80's corolla, that's responsive and mechanical and partially due to feeling like a huge hazard & hindrance in the road. There was a severe lack of acceleration, so going onto the highway for daily driving was a bit dangerous. Even at the floor, it would barely move. It's scary to drive in traffic.
Also, i'm stealing the "wouldn't fall out of a tree" expression.
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Old July 19th, 2017, 12:49   #18
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Quote:
Originally Posted by AndyBees View Post
Seems there was a Thread about someone trying to limp home going from Texas to Colorado with the Turbo gutted....
That was a really great thread! Turbo blew in Texas....stuck need help! - TDIClub Forums
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Old July 19th, 2017, 13:07   #19
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Default Update: One Weak Week Later...

Still puttering around, now with slightly more power!

Intake upgraded; went from 1 1/4" to 2 1/2" shop vac hose:



I'm really glad I bought a spring clamp tool, it is a pleasure to use:



Larger intake hose installed without the size reduction adapters, also, no duct tape:



Right away I noticed more power between 2000 and 3000 rpm. Maybe 40 hp peak now?

There is a measurable improvement in airflow on the Scanguage. It used to report a MAF reading that topped out around 38 grams per second (g/s) before 3000 rpm. Now it reaches over 40 g/s before 3000 rpm and as it is actually worth revving out to just over 3000 now. It tops out around 42 g/s over 3000 rpm. For comparison a stock engine should reach 80 g/s at 3000 at peak boost per the TDI FAQ. I used to see numbers over 100 g/s over 3000 rpm.

I can actually climb all of the steepest hills within 20 minutes of my home at safe speeds.

One other thing I noticed is that the exhaust smells better than it has in a long time, smells like new, maybe because I am under-fueling? I have a fix for that...
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Last edited by NarfBLAST; July 19th, 2017 at 13:15.
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Old July 19th, 2017, 16:01   #20
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i'm interested to see what your economy numbers will be ... are you going to keep track ?
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Old July 19th, 2017, 16:48   #21
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Interesting project. I wonder if it would run better if you unplugged the MAF. Right now the MAF is probably reading very low air volumes because of the lack of boost. That will deliver low fuel. Unplugging it may give you more fuel and a bit more power. Does the car smoke at all now? If not it's certainly under-fueling.
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Old July 20th, 2017, 03:16   #22
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Originally Posted by IndigoBlueWagon View Post
Interesting project. I wonder if it would run better if you unplugged the MAF. Right now the MAF is probably reading very low air volumes because of the lack of boost. That will deliver low fuel. Unplugging it may give you more fuel and a bit more power. Does the car smoke at all now? If not it's certainly under-fueling.

I agree. try running it with the MAF unplugged.. if you aren't seeing MAF readings of 500-550 in vcds while driving, your computer is pulling fuel (and power) if you do ever see numbers higher than that, at low normal driving RPMS, then perhaps its worth keeping the MAF plugged in. my guess is it will feel like you chipped it (comparatively LOL) just by unplugging the MAF.
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Old July 21st, 2017, 11:53   #23
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But, BUT... unplugging the MAF will put you in limp mode! (sorry, couldn't resist but, great call by Peter!)
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Old July 21st, 2017, 13:57   #24
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Originally Posted by jimbote View Post
i'm interested to see what your economy numbers will be ... are you going to keep track ?
I will definitely be keeping track! Fuel economy seems pretty good right now as I've got over 700 km on the this tank and the fuel guage is near the half way mark. I should really fill up soon. This tank is a mixed bag of pre-turbo delete with some towing and some time on the smaller intake hose.

I don't trust the Scanguage to report accurate fuel economy numbers right now, it tends to need to be re-calibrated depending on driving style and trip type. Also, I've just transistioned from "takinging the kids to and from school every day" to "summer randomness". I also find the scanguage needs to be reclaibrated any time an engine parameter is tweaked. I do put some faith in the in the instantaneous Scangauge reports of fuel consumption and it seems like fuel is limited to less than half of what it used to report when more throttle is requested.

I need definitely need to do some logging with VCDS to see what the MAF readings are. Thanks for the suggestions Peter and Aaron. I think it should run better with the MAF connected but have to admit I haven't check the numbers yet. I agree that if the MAF is reading low then it might as well be unplugged. Then again, it is sort of hard to fool the ECU when the MAP is still connected, I might try unplugging that too at some point.

Ideally I should load a tune that supports natural aspiration, but that would cost money and I'm not done experimenting yet!

Besides:

The car it is actually seems to be running pretty nice, the more I drive it the more confidence I get! I had the unique opportunity to drive my wife to Toronto early yesterday morning with no kids in the car. It was lovely! We kept up with traffic just fine on the relatively flat trip on the Queen Elizabeth Way along the shore of Lake Ontario. We reached speeds of 130 km/h (80 mph) and at no point did my wife feel "unsafe". Occasionally I would let out a Jeremy Clarkson yell of "POWER!!!" as I planted my foot on the accelerator and nothing much happened. YET, we always kept up with traffic, and got to our destination and home safely.

The phrase, "Drive more, worry less" comes to mind.

I was going to re-install my old PSI-Powerbox on the injection pump harness to get some more fuel, but I haven't done that yet just because its driving quite adequetly right now and I would like to collect some data first.

To Do List:

- Collect and post MAF data using VCDS
- Refuel and post fuel economy numbers
- Consider modifications such as unplugging sensors or installing the PSI-Powerbox
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Sprint 520's / RC3 / turbo delete
The NARFmobile blog / push button ignition / thrustmaster shifter / http://youtube.com/narfblast
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Old July 21st, 2017, 18:08   #25
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It's no longer a TDI ........ so, you need to move this Thread to another forum category.....

Very interesting.... Will be following to see the stats!
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Old July 21st, 2017, 18:19   #26
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It's no longer a TDI ........ so, you need to move this Thread to another forum category.....

Very interesting.... Will be following to see the stats!
it's still a TDI... Turtle Direct Injection
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Old July 21st, 2017, 19:54   #27
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Default Fuel Economy Looking Good So Far

I had just enough time tonight to go for a drive to the gas station before I had to be home to help my wife get the kids and her sick Grandma to bed.

As mentioned before this was a mixed tank which included driving with turbo, but mostly without turbo.

Drove 715.8 kilometers and used 37.908 liters so this tank calculated: 5.3 L/100km or 44.4 mpg!

Looks promising considering I was consistently seeing on previous tanks: 5.9 L/100km or 40 mpg.

I also gathered some interesting MAF data, and did attempt to drive with the MAF disconnected which had a very interesting result. Will try and put the raw VCDS data into a nice graph before I post what happened.
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Sprint 520's / RC3 / turbo delete
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Old July 21st, 2017, 20:56   #28
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Default MAF Disconnect, Your Mileage May Vary

I tried to graph MAF vs RPM but it wasn't pretty.

All I really needed to know I could tell just from looking at the live measuring blocks: MAF actual never exceeds 500 mg/stroke and it actually goes down below 400 mg/str over 2000 rpm and trends lower as RPMs rise. At first I was really confused, because I was used to my Scanguage which reads grams per second and always trends upward until it peaks out. Then I remembered that mg/str is a function of mass air over RPM instead of mass over time and if mass air can't keep up with RPM then the number will fall off.

Disconnect the MAF and see how it runs you say, don't mind if I do! After all, the default MAF reading should be 550 mg/str across the rev range right? That is what I remember from when my ECU was stock, but with RC3 it seems that Jeff has inserted a new default: 1275 mg/str.

It rolled coal. It was just after sunset but I could clearly see that headlights behind me were dissappearing in clouds of black smoke. Was performance improved? Maybe? It was hard to tell with such a short test. The smoke was unacceptable and I quickly pulled over and reconnected the MAF. Maybe I can test some more one day when I have more time.

So I learned that Rocketchip puts a ridiculous value in for MAF actual when the sensor is disconnected. That is fun and relatively harmless I guess.

Now I wonder what happens if I disconnect the MAP sensor? I would guess Jeff would put a safe value in there, or the workings are entirely different and there is no such thing as a default MAP value.

Would be nice to hear from someone with a Malone Stage Zero tune but I'm starting to wonder if they actually sold any? I read somewhere that they added the NA Stage 0 to their menu only because one high profile customer requested it as a temporary thing so they could move a car around while building a custom turbo setup.
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2001 VW Golf Naturally Aspirated Direct Injection Diesel 5MT 615,000 km
With 1.5" lift / Valeo G60/VR6 SMF /
Sprint 520's / RC3 / turbo delete
The NARFmobile blog / push button ignition / thrustmaster shifter / http://youtube.com/narfblast

Last edited by NarfBLAST; July 21st, 2017 at 21:00.
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Old July 24th, 2017, 06:05   #29
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RC uses 1275 as a default so that at no time will the ECU pull back fueling due to a lack of airflow... makes it real fun with a turbo in there, but NA.. I imagine its a cummins style smokefest. that is unfortunate.

I wonder if you could switch over to the Auto MAP on the ECU (basically the opposite of what the Auto-Manual swap guys do) as a test to see if he has fiddled with those maps as well and report how it runs with the MAF disconnected. (you will get CELs for missing TCU and perhaps a few other things, but it should still run)
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Old July 24th, 2017, 12:26   #30
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I wonder if you could switch over to the Auto MAP on the ECU
Okay, I'm interested, but I did some searches and couldn't find anything. Can this be done with VCDS?
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Sprint 520's / RC3 / turbo delete
The NARFmobile blog / push button ignition / thrustmaster shifter / http://youtube.com/narfblast
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