[Estorilblue340i]

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Just installed my JB4 on my G80, filled up E30, put it in map 5 on the app. Went into map 0 after 2 pulls. Now every time that I try putting it into map 5 it goes back into map 0 after a couple of pulls. Anyone got any idea why this is happening ?

Also it doesn't really feel like there's any power difference

[LongBeachDinanFan]

Check "last safety" in the app to see why.

[S58King]

Same thing happened to me today.

[G80_Soom]

Most likely one of these two reasons or both:

1. You're hitting the boost safety. Go into Map 6 settings and raise your boost safety to 30 PSI. This affects all maps, not just 6.

2. You're running too lean. Did you test the ethanol and do your calculation correct? If E30 mix is correct then it's fine but if you're above E35 then JB4 will hit the safety if running too lean.

[chris3g]

as mentioned you need to check which safety you are triggering

[Estorilblue340i]

Originally Posted by LongBeachDinanFan

Check "last safety" in the app to see why.

Originally Posted by LongBeachDinanFan

Check "last safety" in the app to see why.

Thanks I'll check that right now

[Soylent]

Originally Posted by Estorilblue340i

Thanks I'll check that right now

So what was it?

[Estorilblue340i]

Originally Posted by Soylent

So what was it?

Originally Posted by Soylent

So what was it?

I tried what G80_Soom said and put the boost safety up and it works fine now

[LongBeachDinanFan]

Seems like bad idea to just raise the safety unless you know it's safe to do so. What boost levels are you running and on what fuel?

[mike@x-ph.com]

Originally Posted by LongBeachDinanFan

Seems like bad idea to just raise the safety unless you know it's safe to do so. What boost levels are you running and on what fuel?

+1 is not a good idea at all.

your post is missing a lot of key info

1- what is the E85 mix? Are you using a flex-fuel kit?
2- map 5 is an aggressive map, even for E85, you need to datalog.

The JB4 is going to map 0 to protect your engine, raising the limit will stop the Jb4 from kicking the car back to stock but also stop it from protecting the engine. Please datalog and send it to BMS

[abdulisraddd]

I usually run map 5 with e35-37 and has not kicked me into a lower map yet.

[Info@mad-us.com]

Originally Posted by abdulisraddd

I usually run map 5 with e35-37 and has not kicked me into a lower map yet.

Doesn't it revert back to map 0 if it gets to lean or something else that it feels is dangerous is going on?

[abdulisraddd]

Originally Posted by Info@mad-us.com

Doesn't it revert back to map 0 if it gets to lean or something else that it feels is dangerous is going on?

It might! I'm guessing everything has been solid so far. I really really need to datalog.

[Info@mad-us.com]

Originally Posted by abdulisraddd

It might! I'm guessing everything has been solid so far. I really really need to datalog.

Definitely!

[10ORIO]

On more than one occasion, WOT, 3rd to 4th gear pull, JB4 Map 5, JB4 resets to Map 0. (Engine setting in Sport plus, M mode in sport mode, MDM on)

Logs show that fuel trims start from about 23 and hit 49 for a couple of seconds the JB4 falls out to Map 0.

I’ve been advised that the fuel trims are maxing out (safety sends JB4 into Map0) and I should step down to map 4 and run E30.

Map 5 feels AWESOME when it’s working and I want to keep running it but I haven’t been able to find a way to make it work consistently. I’m concerned about ignition timing and breaking something. Any suggestions??

2022 M3 6MT
E30 mix
JB4 version 46/11/5
BMS front mounted intakes
Mid pipe delete

[Indo Rider]

Guys. Seriously. Learn to understand the basics of reading a JB4 log. Boost vs target, high and low fuel pressure, fuel trims, AFR, ignition advance... Take logs in map 0. See how things change in map 1. Map 2. Learn a little about how the engine actually works. You don't have to be an expert tuner, but you should understand the basics before pushing your car to the limits of safety. Or don't and just cross your fingers.

[Impulse20098]

Originally Posted by Indo Rider

Guys. Seriously. Learn to understand the basics of reading a JB4 log. Boost vs target, high and low fuel pressure, fuel trims, AFR, ignition advance... Take logs in map 0. See how things change in map 1. Map 2. Learn a little about how the engine actually works. You don't have to be an expert tuner, but you should understand the basics before pushing your car to the limits of safety. Or don't and just cross your fingers.

This is key. Learn what is happening between each change. Datalog if you can. This is so important on piggy backs like JB4. While the piggy backs have gotten a lot more advanced than what they use to be, still need more caution if going beyond the basic map.