kiwimanz wrote:
I have been running a full Aero D Sport for a number of years so Im very familiar with ride height etc.
Bear in mind when the car goes to the track it will be running Hoosier R25 slicks. You may want to try lower tire pressure to get your R6's to bite. We run 12 / 13 lbs front and rear! This car will be a full length tunnel car with diffuser and front wing/ diffuser.
Running some early CFD's places the car with more than 1800lbs of down force at 150mph.
The ride heights you are running would not allow any under body aero to serve the purpose it was designed for.
962porsche wrote:
you will be hating your car if you plan on running 1.5 inch of ground hight . my F1000 and my D-sports cars run more than that at 2.25 .
i tried running them at 1.75 and the cars bottom all the time every were . because of the suspenion travel being 3" then with stadic ride hight bring it to 2.75 then with balancing out the car it dropped it to the 2.25 .
you have to remember to low is to slow ! there is the balance of wanting to use the most of all your suspension travel and not bottoming out the car that will put you into a spin . then you have aero down force that will push the car even lower to the track .
in many cases it's about .25 " so if you do that and your running any wings your only going to have 1.25 of ground clearance .
then many will try to up there spring rates as to not have the car bottom . as you know that does not work because you have to use the springs match to the running weight of the car . in my cars i have deferent set but they start at 250 and top out at 325 with each dampener valved to each spring rate .
at the end of the day you will bottom the car and put your self into a spin .
there is also one other thing to think about and that is the tires you want to use for the track .
i tried running the A and R 6's for just track days . one car being 803 lbs and the other at 926LBS they could not build any heat at all . they need to be at 200 degress to work any thing less than say 160 and it's like driving on ice i tried lowering the pressure down to 17 front and 18 rears and still no good the out side and inside temps were still only 139 at it hottest and the centers were only at 124 and it was still like driving on ice . that was with the A6's the R6's were even worse . when i talked to kevin at hoosier he said there is no way to make them work they are a tire made for cars over 1900 LBS . i ended up running just for track days the R35A's and i have used them on the car for two years and 17 two day events now and they still have life in them . the tires i use for wheel to wheel racing is a hole other matter they are so sort i only get two events out of them .
just some thing to think about with very light weight cars .
yes i lowed the pressure but not that low when Kevin from hoosier and i were talking about it he did say that in no way will the A or R 6's every work at any pressure . as you know once your at a point were the center of the tires heat is much lower that the out side temps your at to low of a pressure to ever get the tires to work and build the needed heat into them .
as you know because of F1000 and D-sport rules we can not run a total tunnel car .
that's great you can get a car to work at a 1.5 " ride hight !
my self as a chassis engineer and the owner of a chassis shop i'm a little jealous you can get a car to work with very little suspension travel left and running a car so low that it does not bottom and skate .