UKGTR Season 7 Upper Endurance (GT1/C) - Dubai (GP) - Mar 9

[psuedo]

I have found in the vertigo at least that a pretty high fast bump and fast rebound setting both front and back tend to smooth those bumps out a little....also not changing down whilst going over them helps too.

[Zacari]

The main place I'm having issues is into the last corner, I'm always locking the brakes over those bumps!  Not been round in the Lister yet though, I'm hoping I'll be able to get a better setup than I had on the 360 and TVR.

[Kerr]

The Lister seems fine around here.

As for the times eveyone is getting, i think we are all down

[Truetom]

If you mean turn 7 from this pic http://www.f1gp4.it/downgp4/Track/2007/Dubai_Autodrome_v1.jpg then it's all footwork - for me. I mostly get caught out at turn 6. No amount of damper/ride height changing gets me safely over this section. 

TT

[Jure]

I use softest springs possible and 0,5mm height above minimum height (6,5 and 7,5mm in porker). 0.3 front, 0.5 rear packers (soft rear spring compresses more, hence...).

Differential on 10-90-1 (!). High 1st gear (so u have option of 1st or 2nd in tight corners), rest of them close together.

Lower car plows into the ground (Zacari's problem, had plenty of time to watch it before he went into the distance anyway). Same goes for curbs. Minimum height is too low, front end bites into the curb and spin-o-rama can start.

Wing 8. Race pace in RS 2.01.8-2.02.8 for 20 laps, then the tyres start to protest, time to change'em. Medium medium combo, of course.

BTW, RS has poorer brakes then RSR, one needs duct 2 or they overheat whilst RSR can keep them on 1 (normal weather).

[Mark J]

surprised you need packers at Dubai Jure    The only track i use them at is Spa in the porker.
I'm on same race pace as you, 2:00.8 being my race PB in the GTC RS.
90 coast setting !!?  think im on about 35-40

a little vid to get you all in the mood...though the driver is a bit of a jessy 
http://www.youtube.com/watch?v=MYeF9oT0P4Q

looking at the footage we need a skyline tower crane graphics mod for Dubai !

[Adam Parle]

Cracking vid.  Just listening to it makes me want to go racing!

[Truetom]

Virtual racing seems much more exciting to me.    If I think of a Tuesday Sprint... 

TT

[Jure]

surprised you need packers at Dubai Jure 

try to do a few laps on race fuel load then watch replay, there are at least 3 bumps (back straight has 2) where no packers produce that perfect "sparky" effect. 4th gear and above, car "ducks" when going over them, u can hear it bottoming out by simply listening to the engine revs. Few mm of packers do the trick and you're only using them at very high speed, otherwise they have no effect since you're riding springs instead in 1st-4th gear territory which is what counts, right? Same goes for 1st sector in that nervous 4th-5th gear right hander over the curb, higf rear packer prevents rear end to go too low, therefore preventing understeer (which I did get prior to packers, rear end got lower then front end and that's a no-no).

90 coast, yeah, I find porker easier to drive since it's ze "brake early powah early" vehicle.




cool vid. I just haaaaaaad to open the link while still working... now what (and yes, am working from home, so... argh, tempting)?  

[Kerr]

I use packing very regularly. Most tracks I put a little in rather than run high suspension.        As for the coast setting, I use high coast with many cars and tracks. I find it makes the car stable.

[Jeffrey]

Wow, aren't I the opposite again . I only use packers at Spa, and for the rest I just use very stiff suspension which makes it also possible to ride it low .

And I only use coast around 5-10%  . Gives very sharp turn-in .

[Reign Man]

That's the corner I meant TT. Turn 7. 

I never new that about packers. I never touch them. Though I have always wondered about the drop in revs over bumps.

...I really should spend some time researching this stuff. I'm not a driver IRL so this kind of stuff does not come naturally.

Thanks for the tips. 

RM

[Jure]

Wow, aren't I the opposite again

You're an alien and as such in different physics league. 

BTW, watching that video I've realised how high revving our cars are (there's no way they're changing much later then 8200rpm). First sector is particulary educational, early shifting, low revs.

[Mark J]

doesnt using packers have a detrimental effect on a cars handling though? as does using a high coast diff ?
I'm no race engineer by a long chalk but think i had read somewhere about avoiding packers unless really necessary.

I was debating increasing my rear springs by one notch to cater for the bumps but then that has the knock on effect of more rear tyre wear.
I had seen sparks off the back of cars going over that fast right hander crest in sector 1 and you can feel the bumps in the braking zone upto turn 7? 
I'll give the packers a try first but heck, watch any Porsche cup race and you will see sparks a-plenty as they ground out at different parts of most race tracks. They always run them as low as possible.

[Dave 'Gizmo' Gymer]

You should only ever need packers if the car is bottoming out under high downforce. Eau Rouge at Spa is pretty much the only place I ever need them.

If you're hitting the packers anywhere else all your carefully chosen spring and damper rates go out the window and you will get a sudden loss of grip.

Some people like that.