Manipulate the Weight Bias (Original Thread)

[bimmerlovere39]

fndrbndr: I'm stil getting my head around trying to get the tires to heat evenly.  The extra 2psi in the rear was to try and get a little extra heat in the rear tires. I've noticed most people seem to use either equal pressure front to back or at least within 1psi.  I'd appreciate any input as to how to get the rear tires heated up a bit more without the extra pressure.  Or maybe I don't even need to, the rears aren't *that* much cooler on this particular car.

Correct me if I'm wrong but getting the tires to heat "evenly" - that is to say close to the same temp. on the inside, middle, and outside of the tire - has more to do with camber and toe than the overall beginning tire pressures. 

To properly set the beginning pressure you need to run a number of hotlaps to sufficiently warm the tires and then check temperature - for maximum grip the ending pressure should be somewhere in the 33-34 PSI range.  Anything above or below and you are giving up grip.  In my experience, a typical FR/MR setup should include beginning tire pressures of 29F/28R unless the car is a lightweight.  Beginning pressures for a lightweight FR/MR are closer to 29F/29R or even 30F/30R.  For a FF car I've found success with pressures at 28F/30R.

I thought it was a target of 32-33 - that's what I always go for.

The tire pressure can have an effect on proper camber - more pressure gives a stiffer sidewall, stiffer sidewall requires less camber.

[Carn]

Damping Agents...

There was an excellent post in a thread I started about Dampers once...  here is a chunck of it...

•   increase bump damping in front to increase rear grip during decel = liftoff/braking/corner entry
•   increase rear bump damping to increase grip at front during accel = corner exit
and decrease for opposite affect
•   increase front rebound to increase grip at front during accel = corner exit
•   increase rear rebound to increase rear grip during decel = liftoff/braking/corner entry
•   …and decrease for opposite affect.

Also, for side to side movement (cant think of right word (lateral)) such as going through a slalom or chicane…
•   increase both rebound and bump damping of front to increase transitional understeer
•   increase both rebound and bump damping of rear to increase transitional oversteer
•   …and decrease for opposite affect

I have been trying to find this article you mentioned Blooze, any chance you have a link to said thread 

I am wanting to add some 'agents' as you refer to them to some of my calc spreadsheets but I am not entirely 100% sure of my interpretations with regards to what change brings about what effect especially with regards to the dampers.....Hope that made sense 

[Blooze]

Sorry - I saved the post as a text file.  The thread is somewhere's way back in the Daught GNet archives.

You can see the "agents" as I have them configured in my car sheet which is attached to the spreadsheet archive above.

I don't have anything more than what is in the post that you quoted, save perhaps a more in depth discussion of what takes place in the suspension when various values are applied.

Perhaps you can be a bit more specific with which one is causing you to knit your eyebrows...

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[Carn]

I am really just trying to confirm what I think I know about what changes have what effects on the car and how/what is the preferred or rather, most reliable way of eliminating problems that crop up 

I will need to put together quite a lengthly, methodical approach type post to see if the way I understand things to work is correct, or rather what is accepted to be applicable in Forza2 

[Blooze]

Bump on 12/03/10 - need to get this back on the first page.

[barumba]

Good re-up, Blooze. Lots of rehash going on, that is certain. Like they say, every thing old is new again. 

[Blooze]

I think it helps sometimes to go back and see where all you have been.  It may keep you from having to do all the same stuff all over again.  Besides, some of this old stuff makes for an interesting read.  I went back and started reading the old "Bench Racing with Blooze" thread from the start.  What a hoot.

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