Mythbuster: continuing project thread of my 1303 '75 - Page 16

70Turbobug · #**226** December 21st 2009, 07:54

Isn´t the 993 brake caliper the same as the Boxster S? What master cylinder are you using?

Wally · #**227** December 21st 2009, 08:36

Quote:

Originally Posted by 70Turbobug

Isn´t the 993 brake caliper the same as the Boxster S? What master cylinder are you using?

No, 993 isn't monoblock/axial mount like the boxster. 993 is earlier than boxster, but fysically about the same size.
I now use 944/n/a master with 23 to the front, 19 rear. Like I said, have tried everything

70Turbobug · #**228** December 21st 2009, 09:16

I´m sure you have

Wally · #**229** December 24th 2009, 18:06

Some late incoming (awesome) pics from Julian Hunt (www.julianhunt.net) from the VW Action trip last september:

Yeah, I did run very low tire pressure to try get into the 11's, which worked great for 60ft times, but mph didn't move much:

wrenchnride247 · #**230** December 24th 2009, 21:35

Great photo's Wally!

Jim · #**231** December 25th 2009, 05:39

Drag photos!!! I love them!!

Wally · #**232** December 25th 2009, 07:22

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 · #**233** December 25th 2009, 09:42

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

Quote:

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

LOL! Yes - very important!

Scotts73SB · #**234** December 26th 2009, 02:24

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

dub_crazee · #**235** December 26th 2009, 13:41

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 · #**236** December 26th 2009, 17:55

Quote:

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 · #**237** December 26th 2009, 19:32

Quote:

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 · #**238** December 27th 2009, 06:04

Sorry Deano

Quote:

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.

Quote:

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

dub_crazee · #**239** December 27th 2009, 07:10

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 · #**240** December 27th 2009, 09:56

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.

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