Uk F10 M5 Jb4 Tips And Tricks

[michael4702]

Hi all,

Any tips, ticks and advise welcome re the JB4!!??

I have installed a JB4 and ran in on an n54 before but now I have moved up to an M5 :-)

I am in the UK and can easily get 98+ ron fuel.

My questions are (thanks in advance).

1. Can I run map 2 on the JB4 on a stock car, with stock down-pipes? Lots of tuners in the UK replace the down-pipes (cats) with straight through pipes.

2. What will the stock clutches takes? Will they take map 2 at 22psi? If not what is the optimal psi for stock clutches?

3. How do I programme a different psi? I have the data cable.

4. If I am running 22psi will the car still look after it's self? What should I monitor if anything?

5. What map is the valet map?? I am interested in this for the wife :-)

6. Any benefits of removing the down-pipes/cats? Just faster spool up?

Thanks in advance. All the best!

[OneExtra]

Why would you want to?

Just buy a proper map from Bootmod3

I think JB4 is old tech now the ECU cracked via the OBD

[mike@x-ph.com]

1. Can I run map 2 on the JB4 on a stock car, with stock down-pipes? Lots of tuners in the UK replace the down-pipes (cats) with straight through pipes.

run map 1 with stock DP


2. What will the stock clutches takes? Will they take map 2 at 22psi? If not what is the optimal psi for stock clutches?

Stock clutch is fine


3. How do I programme a different psi? I have the data cable.

map 6


4. If I am running 22psi will the car still look after it's self? What should I monitor if anything?

You dont need to monitor anything, the Jb4 will do it for you
Dont run map 2 on stock pipes


6. Any benefits of removing the down-pipes/cats? Just faster spool up?
faster spool, you can hold boost for longer without overworking the turbos, better sound