Mythbuster: continuing project thread of my 1303 '75

[70Turbobug]

Sounds like you had a blast and great vid also - it's always awesome hearing that monster roar! So where are the "good pics" of the Heidis?
Oh well I guess I'll have to settle with pics from under your car's apron instead

[Bogara_ZO]

Hi Walter,

Nice pictures as always!

So after a day like that what do you say, KONI or Bilstein is your vote? And maybe I've missed something but are you happy with your coil over front setup?

Cheers

[Wally]

Originally Posted by Bogara_ZO

Hi Walter,

Nice pictures as always!

So after a day like that what do you say, KONI or Bilstein is your vote?

20 years old Bilsteins or new adjustable Koni yellows? Its not about make, but model and adjustable or not. I like the new shocks as they seem to work well, but thats about it. The new alignment job with a little more camber in the rear may also have played part in a good road holding in the rear. I dunno what did what exactly tbh.
I do know I know have a bit more understeer? That's where your second q comes in

And maybe I've missed something but are you happy with your coil over front setup?

Cheers

Yes, very! The height adjustability and shock adjustment are great to have I think.
Its a pity there isn't a bigger front roll bar, as I would like a little less roll. So I'll probably have to get a bit stiffer front springs (again ). Car is still comfortable enough I feel, so I think its a logical option to try first.

Hope that answered your q? As you see, these things are car-specific and probably rather personal too, so there's really no "always-good-set-up" to be had...

[Humble]

It looks good on track we just need to get you a better in car camera Were you going all out or still taking it easy? Looks like you could have taken those corners a bit faster That porsche driver must have been annoyed at best or red-misting at worst, getting passed by a beetle!

For the shocks I vote Koni or QA1 double adjustable rear and a koni double adjustable front. I'm still dialing mine in and I have an autox this weekend to test, but I've been very happy with them so far.

[Wally]

Originally Posted by Humble

It looks good on track we just need to get you a better in car camera Were you going all out or still taking it easy? Looks like you could have taken those corners a bit faster That porsche driver must have been annoyed at best or red-misting at worst, getting passed by a beetle!

I agree Humble, camera is having difficulty with the contrast (and I forgot to press the compensate button for that..)
_I_ was going all out for my doing, but was a bit carefull (and not skillfull enough) in the corners and not at max boost (tad over 1 bar) and obviously the car can do much more then I dare or am capable of. The 911RS I overtook so easily did run 2 seconds faster on his fastest round and unlike me, he was pretty consistent. That shows to me the car can run much better lap times, its just the driver that lacks at this point...

[aartjan]

Originally Posted by Wally

Its a pity there isn't a bigger front roll bar, as I would like a little less roll. So I'll probably have to get a bit stiffer front springs (again ). Car is still comfortable enough I feel, so I think its a logical option to try first.

What about moving the inner pivot of the suspension arms upwards?

However, more front rollstiffness will generally tend to more understeer.

[Wally]

Originally Posted by aartjan

What about moving the inner pivot of the suspension arms upwards?

Its already on the upper one of the two holes on that bracket...and there's no room to go even higher. Trust me, I've looked, but good thinking and tnx for thinking with me

However, more front rollstiffness will generally tend to more understeer.

Hmm, I had forgotten about that effect...damn!
The balance is actually pretty good. Its just that the front tires seemed to have suffered more then the rears and on one very tight corner, I wished for a little less understeer, but maybe I should have turned in later there..

[Bruce.]

It's tough to tell from the photos but the inside front tyre looks a little light in the bends. In other words, the inside front is not planted and the front grip is mostly relying on the outside tyre.

It looks like the outer rear has compressed a bit far leading to the inner front lifting (the diagonal effect). I'd suggest a slightly tighter rear antiroll bar or perhaps ideally, slightly stiffer rear springs. A looser front bar might also work but more lean has other issues.

You could also try increasing the front rebound and see if that helps.