Mythbuster: continuing project thread of my 1303 '75

[scourtaud]

Hi,

Nice job but before you go any further, are you sure about the oil you put into the tranny?

Usually in a 911 with LSD (old ones), oil is something like 75w140 (not sure about the exact values but sure about the range). I can check if you need the exact values.

Seb

[Steve C]

Hi

Its a shame that Porsche don't have a "Lack & normal tellie" section like VW where you could look up bolt and other part numbers by description.

Steve

[70Turbobug]

Well done Wally! It will make a world of difference I´m sure!

[Bruce.]

Bet you can't wait to get it on the track

[Wally]

You got that right! I also changed my front springs to 'very stiff'...: I thought I had changed to 350 lbs springs in the past, so I now ordered some +50 lbs ones (400). Turned out they were still 300 lbs... (very nice ride quality, but for track could do with a bit harder), so the difference is a 'bit' more then anticipated LOL.
Also re-installed my self-adapted 'wing' for extra downforce.
Indeed curieus what it will all do/mean on the track.

[TSAF]

You will see a big difference in your lap times. The car must be amazing now.

[TSAF]

Post a couple of photos when possible. We love to see the best turbocharged type iv beetle in action.

[Wally]

Sure will, but it usually takes a few days until all track photographers have published their pictures ;-)

[Wally]

[judgie]

nice pic's. did you notice any differance with having the rear wing fitted?

[Wally]

Originally Posted by judgie

nice pic's. did you notice any differance with having the rear wing fitted?

I knew someone was gonna ask me that
Unfortunately, I have changed about 6 seperate things (LSD, stiffer front springs, different brake balance, bit more boost, removed 40lbs front seat and the wing) on the car before this final. I drove 2,5 seconds of my lap time compared to last month on the same track. It was also quit a bit warmer (more tire grip) and I may have driven a bit more agrressive, so you tell me what caused it by what percentage..?
From my (very) limited seat of the pants feeling, I'd say the higher boost, more grip from the warmer tarmac and my driving made the most difference.
The LSD did not give more understeer at all (to my surprise), but did make the car brake hard more stable. It didn't wiggle its tail anymore under hard braking, even though my top speed at the end of the straight was now 210 km/h (131 mph in 4th gear, approaching 7K rpm) and 5 km/h faster then last month.
There was a point where I (finally) felt the rear tires blocking and I immediately adjusted the Tilton brake bias adjuster (for the first time I ever needed it!) a few clicks. Also a few times on WOT accelerating out of a tight corner in second gear, the rear wanted to step out a little, but I think the LSD also made that exercise a little more controllable, if not for having prevented a spin alltogether.
So, not sure the wing did anything. But its my own basterdized wing, so it doesn't mean _a_ wing would not help. I think it does, but a little better design then just the flat sheet of alu that I used, might work better :-)

Even so, compared to other (modern) cars with much less hp, I am still relatively (very) slow!! I can only conclude I probably cannot drive and/or don't push it to the limits at all. I do want to get home and getting old(er), so that might have s/th to do with it too LOL

I did the laps on 20 psi of boost, so with about 425 chp on the track! and it all went well as I drove the car home on its own wheels afterwards.

All in all, I found it a very good ending of the season

[70Turbobug]

Ooooooooooohhhhhh I like that one!

[70Turbobug]

I do want to get home and getting old(er), so that might have s/th to do with it too LOL

Yeah, no kidding Wally...do you get a senior´s discount yet at the track My guess is while you are running at a for you comfortable speed,the "faster guys" are probably very close to or at their limit.Some use aggressiveness and self over estimation to make up for talent and end up throwing the car off the track.There is no shame in being sensible and responsible

[Wally]

Originally Posted by 70Turbobug

My guess is while you are running at a for you comfortable speed,the "faster guys" are probably very close to or at their limit.Some use aggressiveness and self over estimation to make up for talent and end up throwing the car off the track.

Your not that far of with that assesment! There was indeed quit a lot of damage from cars going off last sunday... (knock on wood).
But its hard to explain everytime why I'am not much faster with so much hp onboard

[TSAF]

Maybe with constant training at the track, your lap times will change. It seems that the cars potential have changed a lot with all these new adjustments. Give a bit of time and I believe that you will see a great improvement on your track records. Did you have a new set of slicks this weekend or you were running oldies?