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Indicate your level of interest in an E-mail Dyno

  • YES! This is great stuff. I'd definitely use it often.

    Votes: 13 37.1%
  • Pretty cool, I might use it once in awhile

    Votes: 17 48.6%
  • I like the CAPS comparison better

    Votes: 1 2.9%
  • I like a "real" dyno better

    Votes: 1 2.9%
  • Rusty needs to quit breathing gasoline fumes

    Votes: 3 8.6%
21 - 37 of 37 Posts

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PassatWorld Staff
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Discussion Starter · #21 ·
glyphin said:
I just ordered a laptop, and I've always wondered what my V6 torque curve looks like, so maybe a VAG-COM is in my future. Just started reading about it. Is the serial connection significantly better?
The "hex-com" connections are actually better than the serial one, but only the later cars can use this. I don't know about your V6 - the VAG-COM website and their tech support can help you with that. The "hex" interface supports a much higher sample rate.
 

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Wow, that was fast. I received an email reply in three minutes:

"
Any of our USB Interfaces should work fine with your vehicle and PC. The
HEX-USB+CAN offers the advantages of heavy-duty construction, the
fastest possible sync and sampling with the greatest number of different
controllers, and compatibility with the greatest number of different
vehicles:

http://www.ross-tech.com/vag-com/interfaces.html

Whomever told you that the HEX Interface "only works on newer models" was wrong. The HEX-USB+CAN works with all of the same vehicles as the KEY-USB but the HEX-USB+CAN adds support for the newest vehicles as well. "

I probably misinterpreted what you meant by "only the later cars can use this". By "use" you probably meant "benefit from"? Anyhow, looks like I'll be eyeing that HEX-USB+CAN model.

Ugh, can't they think of better model names? I guess this product is for engineering types, but still.
 

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My pornstar name came up "Jay the Snork."
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5,611 Posts
I think it is a great idea , and if i had a vag-com i would be all over it. it would make a great focus for a gtg though, so all you atlanta vag-com owners :poke: , start looking for an open date, and the rest of us will look for flat straight deserted cop-free roads.

2 questions:
1) why do you have to use 3rd or 4th gear for the dyno run? why not 2nd gear?

2) would it make sense to do two runs of each type that you mentioned, one in each direction on the straight "flat" road, then average them to compensate for any head/tail wind, or (more likely) unseen slope?

thanks for making such an insane :crazy: offer, i hope to take you up on it this summer.:thumbup:
 

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PassatWorld Staff
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Discussion Starter · #24 ·
glyphin said:
...By "use" you probably meant "benefit from"? Anyhow, looks like I'll be eyeing that HEX-USB+CAN model...
Yes, exactly. I can "use" the HEX interface on my AEB, but the AEB does not support the protocol that enables the higher sampling rate. At least, that's the conclusion I came to after some study. If someone can prove me wrong, I'd love it! I could sure use the higher rate.
 

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Discussion Starter · #25 ·
mfitz said:
1) why do you have to use 3rd or 4th gear for the dyno run? why not 2nd gear?

2) would it make sense to do two runs of each type that you mentioned, one in each direction on the straight "flat" road, then average them to compensate for any head/tail wind, or (more likely) unseen slope?
1) Remember, I have eliminated the coastdown run by using of equations. Those equations were developed in 3rd gear. Not the right correction factors for 2nd or 4th.

2) Yes, it would make great sense. But
a) you would have to average them out and send it to me already averaged, I can't go to that kind of effort.
b) this introduces possibility for error

It might be easier to just experiment first - compare the data both ways and see if it actually makes any difference. If it does make a difference, do several runs and get a percent difference. Cut that percent in half, send it to me as a "gradient correction factor", and I can easily incorporate that into the spreadsheet.

As far as head/tail winds - just don't do this on a windy day. I don't. :)
 

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Rusty said:
As far as head/tail winds - just don't do this on a windy day. I don't. :)
Hah, easy for you to say.

P.S. I would probably use this if I had a vag-com, or, more likely, I would probably have to get a copy so I could use your spreadsheet as a starting point for more :thumbup: .
 

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Founder of the STFA
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Great stuff! Ran another file today and if I knew how to post it I would! Torque peaked at about 218 ft lbs. at 3700 rpm and stayed above 200 all the way to 5800 rpm. Peak hp was about 208 at 5880 rpm. Not sure the real difference between the data lines and the trend lines on the graph, but I'm sure Rusty knows.
 

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My pornstar name came up "Jay the Snork."
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Rusty said:
I can hop out and get a dyno run very easily in 3rd gear, simply accelerating from 1500-redline (approx 20-80 mph). A lot easier to find the right piece of road. Run management is simplified, and the top speed is not too excessive for an empty backroad.
Right now, i hit 90-95+ mph (indicated on the speedometer anyway) in 3rd gear near redline, that's why i was hoping it could get done in 2nd gear.i suppose i could just chart it up to 5500rpm.
 

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^^no no no, that last 1000 rpm tells alot about mass air flow and injector duty cycles, don't skip it. as far as I can tell, using my GPS, the speedo is a *constant* 3 mph too fast at all speeds.

I use a long stretch of road after-hours in an industrial park... no traffic, no cops, road is flat and straight so the 18-wheelers can get around easily during the day. I find I need about 1 mile of road to go "up and down" in third without finishing too close to the end: it takes about 1/2 mile to get to 6500 in 3rd and about 1/4 mile to slow back down.
 

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Rusty said:
One last bump. Here's my current idea for how best to organize the data and questions generated by this "project" -

A forum "area" at the level of "The Marketplace", "Community Forums", "ClubB5", etc, that's labeled

"Email Dyno and Tuning"

In it, there would be two forums:

Dyno Forum
Tuning Forum


The Dyno Forum would be
1) for posting dynos only. It would be like the Info Forum, where only moderators can post to it.
2) There would be one thread for every screen name, like in the Member Directories. Multiple dynos allowed (and encouraged) per thread.
3) Format of the small dyno chart illustrated in my "E-mail dyno" post, with a list of mods off to the side.
4) First thread theory, second procedure, third what to log, maybe 4th FAQ, all stuck so they stay up top. Maybe a 5th stuck thread with a sorted (by HP) list of links to all the threads in the forum.
5) For the sake of consistency and to aide in tuning and diagnosing tuning problems, I would insist that only VAG-COM dynos be allowed in this forum. Any other dyno charts would be meaningless, unless accompanied by a VAG-COM dyno. This is open to discussion, but someone would have to give me a really strong argument to change my mind.

The Tuning Forum would be for
1) those nutty arcane tuning questions like "how much knock retard is allowable" and "what should my O2 sensor voltage be"
2) a discussion forum for tuning suggestions based on the dyno data in the dyno forum
3) Q&A&HowTo for the Dyno Forum

After having D.Passat00 lose a cylinder, and doogie_h have trouble tuning his BT kit, I feel a need for this kind of data available in one stop. It needs to be simple so that it's easy to manage. The above seems simple enough. Any Comments?
Bump for an excellent idea
PLZ do it, everyone will profit of this, especially of:
adapted data for everyone and All things in tuning forum..
And thx Rusty, this is something concrete U want to do for this forum...
THX AGAIN its very appreciated, I'm sure by everyone
 

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^^Bump. ---this is to good to let it slide off the "top pages" yet.
 
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i've recently discovered this forum and this thread so pardon my late reply :)

rusty, it sounds like what you are creating is similar to what "NYET" has done for the B5 S4 crowd. You should check out his site and setup, its pretty slick. you can upload data directly from your harddrive into the online calculator and it will compute HP TQ and plot it...as well as calculating their "FATS" time. The data is stored per user. Here is the link:
http://nyet.org/fats/
here's what the output is:
http://nyet.org/fats/?image=GatorAl_FATS3#result

nyet is a pretty reasonable guy, and his script is available for download...he may help you develop your own calculation. As far as I know, he takes the drag coeff of the S4 into account as well as some other factors in calculating HP.

As you know, the link for the CAPS database has changed from when mmart ran it. He transferred ownership over to me, and it is now located here:
http://www.modifieda4.com/web/caps/b518-new.html

I've tried to make it easier to use, and more functional. It is also manual tranny "passat friendly" with TIP functionality to be added.

I'd be willing to add "email dyno/nyet" type functionality to it if you are interested. anyway, rock on :thumbup:
 

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hi I have a 2000 passat gls.I can hear some sound as if a fan is running under the hood even after the car is turned off.This started last week because of which i think my battery was totaly drained out and i replaced it.But the moment i replaced the battery the sound again started under the hood, i checked to see if any of the controls like a/c or fan are swithed on but all were off more over i can listen to this sound even when the car is off with just the battery terminals connected.As of now I remove the battery terminals when I park the car.Could some one help me out with this sound under the hood and its power consumption from the battery even when the car is off.
 

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1. probably the fan that is under the hood although the battery discharge is probably not because of that (more than likely a minor ground or a bad battery). If you already had this question answered elsewhere than good.
2. I know people bother you for not using the search feature but you can post new topics with questions like this and people will give you answers in less than a year.
3. sorry for ressurecting this post although I would like the spreadsheet if it is in .doc format- rolling dyno should be awesome.
 

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OK, so what if your MAF readings are re-scaled due to a larger housing? Can you still send a dyno in? Also, is Rusty even doing them anymore?
 
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