Tigger73's 125TSI Tiguan Build Thread

[AdamD]

Sorry Damien, I'm not a fan of the Savannah on a Tig in that finish, especially on a black car; they just don't stand out. (The photo above looks particularly bad given the tyre specs, but my opinion stands.) Whereas I love your OZs - perfect finish, perfect size:

[tigger73]

Test fit up some wheels this morning... Looking at swapping with a local Roc owner as we're both run similar offsets.






Obviously we'll change tyres over. Thoughts anyone??

[tigger73]

Tigger73's VW Tiguan 125 TSI Build Thread

Am I right in thinking that Polar FIS was able to read a 0-100 function as well? If yes, have you ever compared it to the GPS data?

Yes I've used both though I trust the GPS based timer more for an absolute value (as long as you first find a flat stretch of road first).

I've found that although the Polar FIS was repeatable, the results were consistently slower. Also using LC with the Autopolar is a bit of a pain as once you have disengaged traction control you then have to set up the timer.

When you disengage traction control it puts up a warning in the MFD which over-rides whatever else you had up and you have to navigate the autopolar menus again to set up the timer. If you've pulled out onto a highway you generally want to get moving straight away so flicking through menus on your MFD after setting up for an LC run is not something I like to do.

The auto-polar is good for non-LC runs. The good thing about the GPS based timer is it takes out all speedo calibration errors. Although with my current wheel/tyre setup the ECU speed and GPS speed are very close (within 1km/hr).


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[AdamD]

Am I right in thinking that Polar FIS was able to read a 0-100 function as well? If yes, have you ever compared it to the GPS data?

Yes it does, and yes we have. The key things to note are that the FIS+ is based on vehicle road speed estimates (while it's using the most accurate bus speed, it's still not perfect), and it's subject to errors based on the sampling rate. The GPS, on the other hand, is a 10Hz chipset that samples every 0.1 seconds, so once it's up and running and the car is on the move it's nicely accurate. However the Gtech has a built-in rollout feature, where it doesn't actually start the timer until the accelerometer has detected motion and the system has reported that the car has moved a short distance (from memory, 12 inches). (The newer models allow this rollout to be customised, but IIRC my older model can't be.) There are a host of other factors as well... road/environment factors, mounting points of the Gtech that can cause it to take longer to trigger the timer, etc etc.

[Dutch77]

Yes. So the other thing you can do is find your favourite piece of "test" road and run all your tests on the same piece of road. At least that way you have a repeatable result (even if it is out).

Am I right in thinking that Polar FIS was able to read a 0-100 function as well? If yes, have you ever compared it to the GPS data?

[tigger73]

That's going to be an issue on almost all roads unfortunately (unless we cruise next time to the Nullarbor?); good reason to run an average over both directions.

Yes. So the other thing you can do is find your favourite piece of "test" road and run all your tests on the same piece of road. At least that way you have a repeatable result (even if it is out).

Awesome first time though, stock GTI just won't keep up.

Thanks. I tried to pick a cruise route that had a twisty, slightly moist hill climb so that I could keep in front of the pack of GTI's snapping at my heels behind me

[Dutch77]

That's going to be an issue on almost all roads unfortunately (unless we cruise next time to the Nullarbor?); good reason to run an average over both directions.

Awesome first time though, stock GTI just won't keep up.

[tigger73]

An interesting figure would have been on the suspected slope, but going uphill instead of down!

Great time on the 1st photo!

Yes doing the reverse run is probably the key. Unless you get out and survey the road prior to any test


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[MGV]

An interesting figure would have been on the suspected slope, but going uphill instead of down!

Great time on the 1st photo!

[tigger73]

Tigger73's VW Tiguan 125 TSI Build Thread

Here's a picture from the weekends cruise




Also while out and about I thought I'd check my speedo and find out what effect down-sizing my tyres had on the accuracy/reading. Plus while I had the g-tech installed I figured I may as well check the 0-100 time while I was at it too.






Well it looks like the smaller tyres knock off around 0.1s. Butt dyno says it does feel a bit nippier too.

Though to give you an idea on the difficulty of getting an accurate time I did this run:






I suspect this piece of road may have had a small slope on it.

So moral of the story is to make sure the section of road you use is as close to flat as possible as even a small gradient can have a sizeable effect on the result.

[tigger73]

New tyres on and it does change the look quite a bit - a lot more wheel gap especially on the rears.




...and before you ask no I'm not going to be lowering it further.

[tigger73]

Tigger73's VW Tiguan 125 TSI Build Thread

Speedo will read slightly slower than the 245/45's now due to a smaller sidewall.
Just so you are aware.

Still for the price those 245/40's were a steal!

Yes I'm aware that the speedo will be slower with the 245/40's. The 245/45's are slightly too big and so actual speed was slightly faster than stock standard. I'm hoping that my speedo will read correctly now with slightly smaller tyres on.

The "correct" size is 255/40R19 but that assumes you're running the 19x9 Savannahs. As my rims are only 19x8 I wouldn't put the 255's on which leaves me with option of either 245/45 or 245/40. So now I will have tried both

I'll be interested to see if it has any noticeable effect on the 0-100 time....

And couldn't go past them for the price either!


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[team_v]

Goodyear F1 Assymetric 2's in 245/40R19. Can't remember the load/speed rating - possibly 98Y but it's more than what's min. spec.

I'm dropping a profile size this time. Previously was running 245/45R19 but decided to see how these go as they are a common "Commodore" size.

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Speedo will read slightly slower than the 245/45's now due to a smaller sidewall.
Just so you are aware.

Still for the price those 245/40's were a steal!

[tigger73]

Tigger73's VW Tiguan 125 TSI Build Thread

What sort?
(And no smart comments about "round ones") :p

Goodyear F1 Assymetric 2's in 245/40R19. Can't remember the load/speed rating - possibly 98Y but it's more than what's min. spec.

I'm dropping a profile size this time. Previously was running 245/45R19 but decided to see how these go as they are a common "Commodore" size.

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[Tiggy1]

What sort?
(And no smart comments about "round ones") :p