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Thread: What did you do to your Polo today?

  1. #7211
    Join Date
    May 2012
    Location
    Perth, WA
    Posts
    232

    Quote Originally Posted by TDIfan View Post
    Been doing a lot of reading on engine tuning lately and the deeper I go in the more I realise the tune on my car was so awfully done

    So I've decided to make my own tune, it's a really huge subject so I'm taking my time

    No progress yet only been reading and comparing maps from different engines

    Only fiddled with the Launch Control with negative outcome on the drag strip so far
    Well at least I get a baseline for this tune and any future tunes should give batter time than this

    A lot more reading is required to make a good tune
    Been doing lots of logging on the car lately, and changing the software bit by bit. The thing with self tuning is you have to learn everything from scratch and you don't become a pro in just a few months. So don't try to attempt this if you don't want to invest your time into it.

    So far I've calibrated the software to run with the upgraded hardware. Changed the diagnostic limits so that I can see what the car is doing in the log. Went through most of the limiters making sure nothing in the software will limit what the hardware can do. Then I moved on to fuelling, the injectors would support more power than the turbo so I set it to where the turbo is at.
    Everything was going alright up until when I moved on to boost, it was overboosting quite badly. The actual boost just spikes over requested at 2200rpm and staying over until 3200rpm, sometimes after the N75 corrected this spike there was no more actuator movement left to control boost so it would stay slightly over till redline. Every attempt to change in the software would not make much difference to that overboost, which makes me to think it's a hardware problem. I asked the vendor who sold me the turbo, and he said the actuator is set at a safe limit and will need to be fine tuned by a tuner. So after eliminating all other elements, it comes down to the actuator. I've extended it by 2 turns(VNT vanes open more in the whole range) to see if I was going in the right direction, and I see the N75 gets more actuator movement left to control boost after correcting the boost spike. Then I did 4 more turns and the result had something I've not expected. The turbo wouldn't spike as high as before and actual boost would stay closer to the requested after the spike. While the boost curve stayed more or less the same down low, I get a lot more torque there than before. It would start to pull as early as 1500rpm where as before all the torque comes in after 2200rpm. Amazingly how this is matching with the log data I got. Looks like as the VNT vanes staying more open the engine gets less backpressure and would produce more torque. That's how low end torque should feel like, and that means I've been driving the car under powered for a long long time.
    Hum well that solved the mystery of 'why my TDI has no low end torque' which was bothering me ever since I did the hardware upgrade.

    And this is where I'm up to now, the actuator might need a bit more adjustment. Then I'll move on to Start of Injection(SOI), which is equivalent to ignition timing in petrol engines. Which is a big job and that's why I leave it till last, hopefully I won't lift the head while fine tuning that.
    06 Polo TDi

  2. #7212
    Join Date
    Mar 2015
    Location
    Adelaide
    Posts
    75
    Users Country Flag
    Got myself these goodies from Germany. Eibach springs, Bilstein B8 shocks and an H&R F+R sway bar kit.

    What did you do to your Polo today?-20157877_10155185450514143_4630870589725272780_o-jpg

    Fitted on car.

    What did you do to your Polo today?-20689753_10155237989749143_8646277748064797541_o-jpg

  3. #7213
    Join Date
    Nov 2010
    Location
    Brisbane
    Posts
    269
    Users Country Flag
    looks good Matt
    2016 MY17 Polo GTI with DA package. TMD fitted + Weather strip and Snow Screen removed otherwise dead standard.

  4. #7214
    Join Date
    Mar 2015
    Location
    Adelaide
    Posts
    75
    Users Country Flag
    Quote Originally Posted by sssstew View Post
    looks good Matt
    Thanks, very happy with the ride quality. Can definitely feel the difference the sway bars make.

  5. #7215
    Join Date
    Oct 2017
    Location
    Wodonga, Vic
    Posts
    648
    Users Country Flag
    brought it home, started making a list of what needs fixing

    What did you do to your Polo today?-polo-jpg

  6. #7216
    Join Date
    Oct 2015
    Location
    Sydney
    Posts
    59
    Users Country Flag
    Got a new battery and filter inWhat did you do to your Polo today?-imag0923-jpg

  7. #7217
    Join Date
    Nov 2010
    Location
    Brisbane
    Posts
    269
    Users Country Flag
    Quote Originally Posted by simon k View Post
    brought it home, started making a list of what needs fixing

    What did you do to your Polo today?-polo-jpg
    Lol! how long is the list?
    2016 MY17 Polo GTI with DA package. TMD fitted + Weather strip and Snow Screen removed otherwise dead standard.

  8. #7218
    Join Date
    Oct 2017
    Location
    Wodonga, Vic
    Posts
    648
    Users Country Flag
    Quote Originally Posted by sssstew View Post
    Lol! how long is the list?
    it's not terrible - it's been sitting since I brought it home and waiting for me to fix some damage to my Focus and put it up for sale, that's done so now I can work on it.


    The car stunk of cigarette smoke so it's after I brought it home I emptied a box of Bi Carb Soda all over the seats, carpet, dash etc. and put an ice cream container of vinegar too. Internet says that works, at the moment it just smells of vinegar so can't tell if it's worked. If it hasn't killed the smell then there's a Meguires product that is apparently a good thing

    I replaced the reversing light switch a couple of weeks ago, it was stuck on - switch was buggered

    The left rear quarter has some damage (like it's scraped against a letterbox or something) and the PO did a horrid job of painting over it, so I've rubbed that back and will spray it at some point.

    So with the Focus done, this afternoon I started on the timing belt (10,000km overdue), hopefully the Focus will sell soon so I can register it

  9. #7219
    Join Date
    May 2008
    Location
    Adelaide, SA
    Posts
    739
    Quote Originally Posted by simon k View Post
    If it hasn't killed the smell then there's a Meguires product that is apparently a good thing
    it
    Bowdens Own do a great one; Pong Go Pong-Go - Lovely smelling deoderiser for your car.
    Cheap, Fast, Reliable. Choose two.

  10. #7220
    Join Date
    Oct 2017
    Location
    Wodonga, Vic
    Posts
    648
    Users Country Flag

    put it all back together, should be right for RWC & rego - and someone is interested in buying my Focus!

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