Mythbuster: continuing project thread of my 1303 '75

[Wally]

Glad you like them!

To fight the X-mas boredom, I thought it would be a good idea to start the engine so the oil could flow back to the dry-sump tank after a 3 month stand-still. Oh, yeah and I had removed the silencer
"honey, it is really neccessary to start the engine every 3 months or it could get stuck"

http://www.youtube.com/watch?v=Hb_wzgslrLw

[70Turbobug]

Great pics Wally! Looks like you´re getting a little air under the front wheels in that last pic?

"honey, it is really neccessary to start the engine every 3 months or it could get stuck"

LOL! Yes - very important!

[Scotts73SB]

Love the pic with the crinkled tire on launch! Bad ass! Great pics!

[dub_crazee]

Wally are those 2.7 boxster calipers or boxster S calipers you're running on the rear? What front discs are you using?

im going to try 996 calipers front and rear on mine to see how that works out.

[Wally]

Originally Posted by dub_crazee

Wally are those 2.7 boxster calipers or boxster S calipers you're running on the rear? What front discs are you using?

Hi (Rob, was it?),

Those are 986 (2.5 or some early 2.7) front calipers. No Boxster S as Boxster S (987) are actually the same as 996 and have 28mm thick front rotors! I have 24mm rotors in the rear, same as front 986. See?

On the front of my bug I now have 330x28mm and I use 996 front calipers for that. Originally 996 fronts are 318x28, but those calipers work very well on 330 too

Progress: adapters made:

[dub_crazee]

Originally Posted by Wally

Hi (Rob, was it?),

Those are 986 (2.5 or some early 2.7) front calipers. No Boxster S as Boxster S (987) are actually the same as 996 and have 28mm thick front rotors! I have 24mm rotors in the rear, same as front 986. See?

On the front of my bug I now have 330x28mm and I use 996 front calipers for that. Originally 996 fronts are 318x28, but those calipers work very well on 330 too

Ah okay, 944T and 987 rear discs are also 24mm thick arent they? (but i beleive the 987 discs are slightly taller)

i am going to be running the 318x28 discs on the front. Did you find much of a difference going over to the 944 mastercylinder from the beetle mastercylinder?

its great learning from others' experiences on here, especially when the cars get used on the track

Thanks

Deano

ps did you ever run rear 996 calipers?

[Wally]

Sorry Deano

Originally Posted by dub_crazee

Ah okay, 944T and 987 rear discs are also 24mm thick arent they? (but i beleive the 987 discs are slightly taller)

Yes, they are, most all rear disks are 24mm I noticed; The hats are indeed taller/shallower with each model, so you need to check out what will work for you.

Did you find much of a difference going over to the 944 mastercylinder from the beetle mastercylinder?

Yes, 23mm or 19mm in the front will make a big difference. But even with the 944 master and mounting the lines so that 23mm is to the front brakes (thus lessening the brake power on the front), on MY car, the rear still didn't bite enough. Or in other words: I still leave braking power on the pavement, it can be better if my rears work harder.
Most all rear porsche 4-pot calipers (including the 996 ones) have something like 28/30mm cups in them. For MY car with 245 wide semi-slick tires, that is just too little I found. Even the 993 rears I had had the largest rear cups I could find (30/34) and even that was too small on MY car.
Notice I said MY car, as I am sure others will have different experiences with their cars wih different set-ups

I just hope to have solved the bias with the 36/40 cups in the 986 front calipers...I'll et you know how it turns out next (track-day) season

[effvee]

Very nice work Walter. Question, presently I have the 1985 944 rears for both front and rear. Do you feel fix caliper do a better job than floating calipers?

The reason for my question is due to, on my Chevy truck I have floating calipers and the right front wear every time faster and sticks. This is due in large part to the floating caliper design. However, over here fix calipers are hard to find. Unless I want to go to the Porsche junk yard and get rapped by sticker shock



This is the front caliper on the rear, I feel I can't just use four wheel disk brakes from a 944/front engine, and not try and even out the braking. I have a old, I believe a 1970 911 book, in it, they use pretty much the same diameter calipers on front and rear. Leaving the larger caliper on the front, I feel would cause lock up too easy.

[dub_crazee]

no worries about the name mix up lol

off the top of my head the 987 discs are 2 mm taller than the 944T discs and are cross drilled. i have a set of both so il see what works with my set up.


as you say thats all for YOUR car. part of the fun with these german look cars is trying new things and finding out what works. i look forward to future updates

thanks again

Deano

[70Turbobug]

I´m sure that running those big 18" wheels and a 245 tire requires a much higher clamping pressure than with a 17" wheel and 225 or 235 tire.

[oasis]

I hope I'm not intruding on the brake conversation but I am curious about ...

... the holes you drilled in your front spoiler. It is obvious you did it such that the air could travel through the holes as well as the slits in the front apron, but what do you have lurking behind that front apron needing air?

[Wally]

Originally Posted by oasis

... the holes you drilled in your front spoiler. It is obvious you did it such that the air could travel through the holes as well as the slits in the front apron, but what do you have lurking behind that front apron needing air?

Just a relatively small mercedes (Behr) transmission cooler, which I use as an oil cooler.
Amazingly, it seems to be more than enough for this - and former - engine(s)

[70Turbobug]

Do you feel fix caliper do a better job than floating calipers?

A monoblock or fixed caliper is far better.It has more stability and more clamping pressure and resistance to heat.The resistance to heat without warping is the biggest advantage,because the caliper maintains braking pressure and doesn´t fade as much.

[Wally]

Regarding the 944 MC: I did a lot of hard thinking why the rears gave so little brake force, even with the 23/19 cups.
My conclusion at the moment is that maybe, just maybe, with the brembo alu calipers, the travel is less than on a floating-caliper with a 53mm cup as the older 944's had. That would mean that the fronts already have full contact while the rears have not fully engaged because the rear 19mm cup just isn't pushed any further in the MC...
Its also means that you just can't use the MC cup sizes to 'adjust' your bias! The MC cup sizes are there only to level out the travel of the cups in the MC, so its equels both front and rear to give the same travel/force.
Hope this explaining of mine makes any sense.

A while ago I ordered a 20.6/20.6 MC from Mid america Motorworks and it said you could order even for the superbeetle's inclined flange! For just $39.95! but it was in backorder and would take 4 weeks... Yeah, I thought, so we'll never hear from them again..
Great was my surprise when it turned up at my doorstep exactly 4 weeks later! (today)
Made in China from EMPI in blister packaging! Figured

While the pedals are out to fit a new gaspedal from CB with 'turbo' written on it (that will surely give 20 hp extra!) to replace my worn plastic and too deep lying old pedal, I will install this new MC while I am at it and let you all know what it does on the track next season. Then I can really say that I have tried everything ;-)

[70Turbobug]

Good luck! I´m always very skeptical about Empi parts to put it politely...