Maggo

Drove today with the Mustang over the famous Nürburgring Nordschleife:

ABS comes very early.
How does the FR500S ABS work with Street tires like Michelin Pilot Sport?
And the stock rear axle is far too long.
What would you suggest? 3.55 or 3.73?

bob

Okay, accidently closed the link for the 3rd time but here goes;

FRS500 ABS controller will increase the threshold at which the ABS cuts in but requires a switch to the GT500 ABS unit if your car doesn't already have it. A tire change will not effect the operation of the unit. Switching pads in combination with braided brake lines will effect the operation but it appears that brake lock-up occurs faster than the unit can modulate at least in my car (09 GT500) with Hawk HPS+ pads DBA 5000/4000 rotors and Goodridge brake lines but doesn't throw a light.

As for which gear I suppose it depends on what your looking to accomplish. The 05-10 cars are speed limited by max engine RPM but the speed limiter is set to 155 mph when using a 3.55 or 3.73 gear set, the 11+ cars are limited by the speed limiter when using the same gear set. I've included a 4.10 gear set as well.

27" diameter tire with 3.55 - 3.73 - 4.10 gearing and 6250 rpm rev limit using TR3650 trans (05-10 Mustang GT)

I: 42 mph - 40 mph - 36 mph
II: 71 mph - 67 mph - 61 mph
III: 107 mph - 102 mph - 93 mph
IV: 141 mph - 135 mph - 122 mph
V: 210 mph - 199 mph - 183 mph (theoretical)

27" diameter tire with 3.55 - 373 - 4.10 gearing 7000 rpm rev limit using MT82 trans (11-14 Mustang GT)

I: 43 mph - 41 mph - 37 mph
II: 65 mph - 62 mph - 56 mph
III: 94 mph - 89 mph - 81 mph
IV: 120 mph - 114 mph - 104 mph
V: 158 mph - 151 mph - 137 mph
VI: 244 mph - 232 mph - 211 mph (theoretical)

http://www.apexgarage.com/tech/gear_ratios.shtml

Maggo

I don't understand the difference

bob

I didn't notice the title of the video for the year of your car but its fitted with a Tremec TR3650 5 speed transmission ( well unless you have an automatic ) and if you have the stock rev limit for the engine (6250 rpm) and speed limiter ( 155 mph) the first table applies to your car, column one would indicate the maximum speed in gears 1-5 with a 3.55 final gear, the second would indicate maximum speeds with a 3.73 final gear and the 3rd column would indicate the maximum speed of each gear with a 4.10 final drive.

Each numerically higher gear will offer improved acceleration while lowering the maximum speed you can reach in each gear. Depending on what sorts of speed your seeing as you make your run you can decide how much of a trade off your willing to make for improved acceleration.

The link will allow you to play with the values in the table if say you want to adjust other parameters like rev limit, tire diameter and final drive.

Ford designs in a stable valvetrain for about 400 rpm over the stock rev limit so you could safely rev the engine higher ( say another 250 rpm) to regain some lost speed.

Or increase power and use the least aggressive final drive to maintain the ability to reach a higher speed in each gear, maximize acceleration or what have you.

Maggo

I have the FRPP Bullitt CAI with the Ford Tune.
Rev limit is 6500 rpm now and have a MT

RehagenRacing

To clarify, the FR500 ABS module will work on the car. Depending on the build date of the car, you may also need the GT500 HCU (Hydraulic Control Unit).

bob

When did Ford switch to the GT500 HCU across the board. That would be some interesting bit of info to know?

And was that for V6 cars as well?

RehagenRacing

That seems to be a grey area. It seems like it was part of the mid-08 switch, but we've seen even 09's with the old unit.

It would also seem that it's only the V8 cars.

Maggo

Do you have the part number of the correct HCU to match the FR500S ECU?

I will change to the 3.73 rear axle

BlueFirePony

Im from Germany too. I have drove my previous car an Rx8 alot of times in the Nurburgring but i just got the mustang acouple of months ago , so im planning to go next year. Where youre station at?

BlueFirePony

i really want to upgrade the suspension of the mustang because i see is not the best to go with stock suspension to the Nurburgring. I was able to stay close to Porsches in my Rx8 .

Maggo

I'm near Frankfurt.

Maggo

Made some calculations with Excel

Stevedotmil

I agree that the stock Track Pack suspension is even too soft from my experience. I'm in Grafenwoehr.

Stevedotmil

I'm trying to figure out if my car has the GT500 module. I am replacing the front rotors with stock blanks as I've read that they are very good at getting rid of the heat. I also got them from a guy who had a new set he wasn't using for cheap. I am putting HAWK HP plus pads on the front and have stock Track Pack pads and rotors on the rear. I would like to know if you think that the brake bias will be off because of the different pad compounds or if I should just make the switch to the HAWKS in the rear as well. I'm also toying with getting some Ti shims for the front to help with the heat too.

PA-Fatboy

This thread is from awhile ago, but hoping you are stil on. Great video btw. It was a lot of fun watching it. I travel to Germany quite a bit for work. Driving the Nurburgring would be amazing to do in my mustang. How did you guys get the cars there, and what was the process to be able to drive on German roads with them? Any restrictions? With a load exhaust driving through the small towns with all the brick and stone architecture, I can't image a nice reception, but maybe I'm wrong?

5.M0NSTER

Thread revive. Not in a mustang, but here is my quickest lap so far in a 2017 BMW M2. 8:18 so far.