Tigger73's 162TSI Sportline

[tigger73]

Ok the experiment is complete. A 2kg reduction in wheel weight results in approx. 0.1s improvement in 0-100.

Totally unscientific but it is repeatable and justifies completely the investment in lighter wheels.

Tyre pressures 38PSI all around. Ambient temp 23degC. Clear day and run at 10m above sea level (give or take a couple of metres). Actually run on same toad as previous run and one pass in either direction within 0.01s so we’ll call it a good result.






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[tigger73]

I noticed your addition to your mod list of the HPFP, I was saying in the other thread this might have been the differentiator between the TTE475 and L450 builds. Now it’s a more level field, I’ve got my popcorn and waiting now for the build, dynos and/or timed runs.....

I noticed that Tristan had one in his build and so asked my tuner about it. His response was that it was definitely advisable. Not because they run out of peak flow as such necessarily but stock can't built it fast enough so yes upgrade is recommended (but not essential).

So I've added it to the list... which is growing longer rather than shorter at the moment hence why wheels are for sale

[tigger73]

Let me know how you go with the gtech run, I know there are many variables, but this would be a good practical test of the unsprung weight theory.

Now buy my Kapstadts to replace those heavy Suzukas and you may even get into the 3's...

[Melbourne_Tiggy]

Ok the experiment is complete. A 2kg reduction in wheel weight results in approx. 0.1s improvement in 0-100.

Totally unscientific but it is repeatable and justifies completely the investment in lighter wheels.

Tyre pressures 38PSI all around. Ambient temp 23degC. Clear day and run at 10m above sea level (give or take a couple of metres). Actually run on same toad as previous run and one pass in either direction within 0.01s so we’ll call it a good result.






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Hey thanks Tigger. That’s a great result! 0.1s is nothing to sneeze at......good to know what 2kg per corner can do on improving times. My mate has a set of light rims, I might give it a go.....

In terms of tyre pressure the VW specs say 230 KPA / 33 PSI, I know the scorpions have a max tyre pressure of 50 PSI under load. Do you think running 38 PSI has increased your traction and improved performance?

[Melbourne_Tiggy]

I noticed that Tristan had one in his build and so asked my tuner about it. His response was that it was definitely advisable. Not because they run out of peak flow as such necessarily but stock can't built it fast enough so yes upgrade is recommended (but not essential).

So I've added it to the list... which is growing longer rather than shorter at the moment hence why wheels are for sale

Have you thought about the ignition side, with perhaps colder plugs ? With the air/fuel/timing changes and running more aggressively, you might need some plugs that can cope....

[Melbourne_Tiggy]

Now buy my Kapstadts to replace those heavy Suzukas and you may even get into the 3's...

If I strip out the car and get some lighter wheels I might be able to scrape in there. Not that desperate, and no offence but I prefer the look of the Suzukas...

My friend has a set of light/racing wheels under 10kg per rim, for some giggles I might put them on and do a run !

[Melbourne_Tiggy]

For the sake of science (if you get time) are you able to do a run at 230 KPA per tyre and see whether there is any improvement ?

[tigger73]

Hey thanks Tigger. That’s a great result! 0.1s is nothing to sneeze at......good to know what 2kg per corner can do on improving times. My mate has a set of light rims, I might give it a go.....

Yeah I was a little surprised it was so much to be honest. By the time you add a tyre on there it'll be the difference between ~26 and 28kg. So in percentage terms it'll be 7-8% and not all of that weight will necessarily be at the outer rim either.

If I was chasing lowest weight wheel I probably wouldn't have put on a 20" HRE flow formed (semi-forged) wheel. More of an interest thing but definitely something to keep in mind when changing wheels for sure. It's a pity that weights are not so widely published as it's sometimes hard to get these numbers.

In terms of tyre pressure the VW specs say 230 KPA / 33 PSI, I know the scorpions have a max tyre pressure of 50 PSI under load. Do you think running 38 PSI has increased your traction and improved performance?

If anything higher pressures will reduce traction/increase wheelspin/reduce rolling resistance. I'm not sure it makes that much difference to be honest. Given that it's 37 degrees in Adelaide today that test will have to wait for another (cooler) day. I'm not getting traction issues off the line and if anything a higher pressure will help with performance once off the line.

[tigger73]

If I strip out the car and get some lighter wheels I might be able to scrape in there. Not that desperate, and no offence but I prefer the look of the Suzukas...

My friend has a set of light/racing wheels under 10kg per rim, for some giggles I might put them on and do a run !

It was only said in jest, however it would be interesting to put some lightweight wheels on your car, strip out any unnecessary weight (spare/tools) and re-run the times. I know when you get down into the lower numbers it gets increasingly difficult to make a big difference in the time without fairly sizeable increases in output and traction.

[tigger73]

For the sake of science (if you get time) are you able to do a run at 230 KPA per tyre and see whether there is any improvement ?

We'll see how we go... though I suspect the difference will be in the 100th's and not something that you'd be able to reliably measure.