Since adding the brake cooling kit I've been very pleased with the performance of the brakes on trackdays. However, by chance a set of 993 front brakes came up at a bargain price, so I duly snapped them up. These have now been fitted using caliper adapters, Solid 928 S4 rotors and Brembo HP2000 pads in 993 fitment.







As the car was going in to my indy (Unit 11) to do the conversion I decided to add the RS short shift and a set of H&R anti-roll bars at the same time:







The results of the upgrades are great. The roll bars are currently on the softer setting at both ends but it's now much sharper to turn in and feels much stiffer. The gear change is shorter and has a nice throw. Particularly, the down shift to 2nd under hard braking - this one has always been the hardest to get right on track sessions. And as expected, the brakes are fantastic and inspire confidence when they're worked hard.

The only issue that cropped up during the upgrades was that the DesignTek caliper adapters were shocking quality for what they cost (£200 for the pair). We needed to get shims made up so that they would fit the rotors correctly and therefore use longer bolts than the ones supplied. And when the first caliper bolt was torqued up, the threads sheared in the adapter - so we had to put helicoils in both adapters in order to use them. If anyone else is thinking of doing this upgrade I'd advise choosing the Rennline or FVD versions instead.

Now looking forward to seeing how she goes on a track day next month.

 

Good cost effective brake upgrade.
And they look v good.

I noticed a big improvement with the roll bars.
A lot more stable.

 

Over years of ownership, isn't it so fun to add these great products to our cars. You know the car so well, that you can feel and appreciate each improvement. An already awesome car, turned up one more notch.

Great information regarding the brake upgrade too.

 

Top upgrades Steve, I'm sure they will a real benefit on the track especially the roll bars, I was surprised you hadn't done that mod earlier tbh

 

Nice mods Steve. Where did you get the anti roll bars from?

 

i replaced my rear H&R Sway today with RS-Stuff :-)

have fun. Idea of using the 993 front calipers is quite good. Is it possible to use the 993 discs too?!

regards thilo

 

Yep, they feel like there's plenty in reserve and the ongoing cost of rotors and pads is not much more than standard brakes.


Totally agree with you. Step by step changes keeps making the car feel fresh.

I got there eventually!

Design 911 purely because they had the best price at the time. They've actually gone down a few quid since I bough them!

 

Thanks for quick reply. It's soon great to be back online and back on this forum. How I missed it.

Cleaned the cars yesterday, it's great to have them back too. Can't wait to do Oulton again, will look to stay at the same place as last time. This seems like a great addition to my suspension upgrades already in place.

Keep we'll, see you soon'ish!

 

993 rotors have the wrong offset, hence the use of 928 rotors. 968 M030 rotors can also be used if you want cross drilled but are a lot more expensive. All this info was right here on Rennlist.

To use 993 calipers and rotors I would have had to fit 993 wheel carriers which would have been a lot more $$$.

 

.

 

No! The car/project is finished now. Honest.

 

Next must have? LSD Steve. Just do it!!

Try before you buy? Just get in touch

 

Of course there is always the C4 or 3.8 conversion to improve your car if you are really serious

 

i'd suggest a couple of additional things, the brake setup that you now have is very front biased @70bar line pressure(hard stop) you have 2306nm of front brake torqu and 874nm of rear brake torque and a f/r ratio of 3.626. For comparison a 69-83 911 would have 1444/960nm for a ratio of 1.491, The '69-83 ratio is you target.
1) remove the p/v, the bias ratio goes to 1.958
2) change the rear calipers 993 rears, the ratio goes to 1.604 which is at least close to the ballpark you want to be in.

additionally, the addition of the larger front calipers has changed the slave/ master ratio from 45.546, to 46.338 this is border line. Ideally for performance use the ratio wants to be in the lower 30s, w/ the addition of 993 rears this ratio goes to 49.844 which is too small to service the calipers. So switch to a 993 23.8mm m/c, unfortunately you need to use the 993 mount and booster too(an additional cost) w/ the 993 rears and the 993 m/c the slave/master ration goes to 37.342 which is quite acceptable and gives a better pedal to boot. Of course if you have a C4 the m/c swap is unnecessary as they come oe w/ 23.8mm m/c(the stock slave/master ratio for a 964 C4 is 32.342, or darn near perfect)

 

If your really serious you build the 3.8 in blue and connect it through a g50/30