Red Devil mkII - The Journey Continues

[Eddy]

Stiffer front anti-roll bar => more understeer, not less, gt.

FWD will alway understeer on exit of slow turns - that's just a fact of life if the car to be at all balanced for entry and mid-corner.

Eddy, I reckon you're warming yourself up, not the tyres whilst weaving around. You may also be scrubbing off pickup from the previous session but tyres need sustained loading to generate any significant heat. Unless you're out to get best times in the 2nd lap of a session, I don't see warmup weaving providing any overall benefit.

Here's a test done with bikes to try and measure the effect. A car is much heavier but also wears bigger tyres and more of them to distribute the weight. Tire Temp. and Weaving

Hoyhoy.


First thing Greg, why have a front sway bar @ all.
Secondly, if your going hard enough, understeer with braking happens when entering turns more so than exiting.
>
I know that I'm just a silly old fart, but even with myself driving the Little Blue Girl, the fact is that I have several official sub 1'10" times @ Waky & guess what the Little Blue Girl is the only Polo to do this, may be its just a fluke.
To top it off She's drive down to Waky from the Gold Coast & now also tows a trailer as well.
>
Below shows Warren Luff who grew up on this track & also had more HP than the Little Blue Girl - 270 against 240 approx.
His time was 1'10".2

http://www.vwwatercooled.com/forums/f127/functional-flat-underbody-rear-diffuser-design-82035-post912022.html#post912022

[h100vw]

When I do QR next I will stiffen the rear to see how that feels. I'm somewhat reluctant to stiffen the rear much at lakeside as I'd prefer to not go backwards under the bridge should it get overly twitchy.

I set mine to full stiff before the last HL. Felt OK there but definitely not so much on the loop onto the highway from the airport. It feels really twitchy there and has probably lost 5-10kmh off the max speed I dare to hit.

I should back it off to confirm my suspicion.

Gavin

[seangti]

We're talking sway bar settings though the appropriate setting is dependent on the spring rate. A stiffer spring on the rear will allow you to run the front sway bar setting harder to compensate or balance the car. Eddy, are you running the standard rear KW springs? I had a feeling you'd changed rear springs? This may better explain why it works.

I will swerve in the first lap of the first session to get a feel for the grip levels and scrub the tyres. I don't know if it increases heat, but it improves my focus and feel.

Sounds like I need some trial and error to see what works for my set up and my driving style.

It's good to hear of the different set ups and what's working for each of us.

Gav, yeah the risk of swapping ends on the streets are higher given the reality of mid corner lift off.

[seangti]

http://www.vwwatercooled.com/forums/...tml#post912022

ahhh, the memories of an old thread and the joys of hindsight. Just gotta get out there and drive the damn things, if it's not working for you, work out whether it's you or the car, than what's the most practical approach to change, you or the car.

Eddy, would be tops to do a track day with you as a point of reference, compare notes and check out your car. At the moment I can only compare to mk6 golft GTI's and R's. I anticipate doing the VW Nats next year at wakefield, whenever that is.

[kaanage]

We're talking sway bar settings though the appropriate setting is dependent on the spring rate. A stiffer spring on the rear will allow you to run the front sway bar setting harder to compensate or balance the car. Eddy, are you running the standard rear KW springs? I had a feeling you'd changed rear springs? This may better explain why it works.

I will swerve in the first lap of the first session to get a feel for the grip levels and scrub the tyres. I don't know if it increases heat, but it improves my focus and feel.

Sounds like I need some trial and error to see what works for my set up and my driving style.

It's good to hear of the different set ups and what's working for each of us.

Gav, yeah the risk of swapping ends on the streets are higher given the reality of mid corner lift off.

It's quite possible that the H&R springs that came with my cup kit have stiffer rear rates relative to the front which is why I found that my PoD was pretty much perfectly balanced without a rear anti-roll bar (and why I only added one when uprating the front ARB). The balance is set by the relative roll stiffness so the springs absolutely play a roll (pun intended).

The swerving around to get a feel is what I mean about warming yourself up rather than the tyres. I do it by playing with corner speed and throttle on the first lap of a session for the reasons I have stated before.

With faster corners (eg turn 1 at Phillip Island or Eastern Creek), it doesn't take much mid corner lift off to turn the car around if you set the car to "point". I had this due to too much rake when I ran the rear perches.

[Eddy]

Eddy, are you running the standard rear KW springs? I had a feeling you'd changed rear springs? This may better explain why it works.

Hoyhoy.

Yeah I do have stronger rear springs as well as the fronts, so things will be different to any others.

[seangti]

Picture of the crack in the manifold while it was on the car. Crack is through the whole way.

[Jmac]

[QUOTE=seangti;1097430]Picture of the crack in the manifold while it was on the car. Crack is through the whole way.


The bracket that wasn't on the exhaust. There were no bolts.
[/QUOT
Nice crack, and its the one with the dodgy stud. No nuts on the bracket man that's poor. Never seen that , didn't have the pipe off mind you and that sort of thing should have stuck out, no way they should run off so they musnt have been there, maybe just in there location , that under heatshield, not sure judging by pick? I was paying more attention to the short circuit, ( main reason car was in care, Guess I have to add that , shouldn't but do ) not to worry mind wont help it now. Hope the new manifold holds up , that's making me think big time with the ATP I was going to use on my 20V conv.
Jmac

[seangti]

Hope the new manifold holds up , that's making me think big time with the ATP I was going to use on my 20V conv.
Jmac

Yup. The ATP does flow better than the standard, there's certainly been a drop in power with the standard manifold having gone back on. I think it'd be equivalent to dropping a few psi in boost, or to overcome, adding a few. It revved freer before. For the meantime, it's staying as it is as the cost of a new manifold and labour associated doesn't translate. For lap times, itd be money better spent on track time, driver training and/or tyres.

[grandturismo]

Group buy Advan A050 anyone?

[seangti]

Group buy Advan A050 anyone?

I'd be interested in pricing them.

[kaanage]

I need a couple after today

[seangti]

Here's some video of mates running last weekend at timeattack. I wasn't running, for the same old reason as other occasions... Car is back in the shop, will elaborate at a later time.

[grandturismo]

Great Vid. Its always interesting to hear exhaust notes and how slow you look

[seangti]

Had a dyno run done on Friday to see how it's all going, made 170.2kwat.