mark kibort

that vet is stuck like glue. know the car well. new A6s are like medium compound slicks. great downforce effects around 8. that thing is planted!

nothing to take away from that 1:55 lap, but he was cutting the corner which saves about .5 second easy at turn 10 complex

mark kibort

also a thing here called corner balancing. move the weight as i suggested. raise the driver front by 2 turns on the shock, raise the rear passenger by 2 turns as welll. start there and get back to me.
cut that battery box out and get a little battery. 50lbs to be saved right there, plus the 20 for the battery box. 70 lbs that is just making your car unbalanced and more heavy than it has too. get a 4.5" cut off wheel and cut it out. dont forget the ride hight changes to fix the corner weights

brutus

Right nose heavy and all four tires the same size, other than Nascar who in the professional racing world runs that way ? And they only do it because they have too.
Maybe you need to tell the F-1 guys to move a lot of weight forward and run "four square".

IcemanG17

another video

justaguy

2:07 in 4th gear only thats pretty good.

IcemanG17

another video.......my great battle with sean on Saturday.......

justaguy

Brian
That was a blast thanks for posting.

Speedtoys

Mayyyyyybe you should wonder how to get 4000lbs of downforce on a 928 and not worry about it.

mark kibort

you asked, and ill tell you.

ALMS, i the fastest sports car ever made, ran 4 square.

we do because we have to as well, and can. you cant do it in a 911.
you cant change the weight distribution of the car with ride height or moving things around. what you can do is help fix thigs that are how they are and Anderson and I have done lot of this. dont re-invent the wheel. ive built 6 racers now, all of them have the exact same ratios, and they cant get much better than they are. by doing what ive done you will get the best weight distribution for the least amount of cost/work.
you want it pefect, be prepared to change the car quite a bit an be moving engine position.

Aspkiller

First of all, most of us are not in the "professional racing world" and sometimes we do things for reasons that might not be optimal for the cars' performance. One of the best reasons for running 4 square, which I do when running drys, is that I'm able to switch tires around to any position and to carry fewer set-ups in the trailer.

Also, you can change corner weights with ride height adjustments. At least on my car you can.

brutus

I have to go with Larry's comment that the advantage of running four tires the same is some cost savings and convenience it is NOT ideal or an advantage. Same with nose heavy it is what is and nothing about is is a good thing.
Given a choice between carrying more weight or going lighter, always chose lighter. Some even use a light weight Chevy motor Now if he just ran wider rear tires to get all that power down.

Aspkiller

I'm already at 335s on 12s. Can't justify spending even more for tires and having to take the rear fenders out even farther.

However, I was considering reshaping all four corners in order to put drop spindles on the car. 928s ride a little high when they have big rubber and getting the car lower to the ground would be a real benefit. The required change to the appearance of the front of the car was just too extreme for my eye. At least for now.

IcemanG17

Larry
How are your shocks mounted......I know your suspension is modified.....

928's with stock shocks and stock mounting positions can only get so low before it rides on the bump stops..... For example my widow handled BETTER the more we raised the suspension....since koni's (what was on the car) don't like being near bottomed out.....

My new car has Heim joints all around, top and bottom mounts....with custom bilsteins....it can be SLAMMED to the ground and the suspension will still work....my front ride height when measured at the factory point is 90-95mm.....suspension works great and does NOT bottom out....the springs are 800's but the compression valving on the shocks is STIFF

Aspkiller

My rear is custom upper and lowers with a more outboard shock mount on the lower. The front has an "almost" stock lower and custom upper, but with similar shock mounting points. Shocks are Penske doubles with Hypercoils. Heim joints almost everywhere you could put them. But the real limitation is the position of the spindle relative to everything else. Some of the Corvettes use LG custom uprights that let the car drop a little over 1", which is significant.

Is there room in the upper area of the wheel wells to allow for a "slammed to the ground" set-up and still have enough suspension travel? With 335 30 18s all around, I don't think I could get away with it.

I'm on the lift right now and can't do any real measuring (waiting for a steering rack, again). Once we're back on the ground I want to do some accurate measuring and see just how much room there is, cause "lower ain't slower."

jfmar

Hi Brian!
Thank´s for the nice videos.
I´m building a trackcar of a -90 GT 5 speed and are planning to go with similar spring/shock arrangement as you have. Do you remember your shock lenght front and rear? and also i understand that you run 800 pounds springs, I guess in the front, what do you run in the back?
Stock swaybars?

Would appriciate any feedback before putting in my order on shocks and springs...

Jerry