Bootmod3 Tune Questions

[YanoM5]

Hello M5/Bootmod3 owners. I’m new to the M5 platform and just purchased a BM3 tune. A couple questions if i may...

1. I’ve read on forums I need a battery charger to flash? This is new as when I’ve done a flash on my previous cars GT-R and S4 I didn’t need a battery charger.

2. I live in Washington and we have 92 octane. Would it be safe to run the 93 OTS tune instead of 91. If I do chance it with the 93 OTS tune, is there a knock safety feature that cuts boost or adjust timing?

Thanks in advance.

[M5BMW]

1. If your battery is good then you don't need a charger.

2. DO NOT use an octane rating which is less than recommended. If anything, always use a higher than recommended octane. This is especially important when running fuel from the US of A.

[OneExtra]

Originally Posted by M5BMW

1. If your battery is good then you don't need a charger.

2. DO NOT use an octane rating which is less than recommended. If anything, always use a higher than recommended octane. This is especially important when running fuel from the US of A.

Personally I wouldn't risk not using a charger, everytime I have spoken or seen a car mapped for the first time they use a charger, its not worth the risk.

Just make sure it flows at 20a when on charge as this is about how much it uses when uploading

[Mr. M6]

use battery charger for first time because it will unlock the DME first...

for octane get OTS 91 octane and use 92 octane... dont do 93 octane and you have 92... or boost your octane up with anything in the market

good luck

[YanoM5]

Okay. It sounds like using 91 is the way to go. I’m just sad that I’m leaving so much power on the table by not going 93.

[ssgm1x]

i needed a battery charger cause my battery was like 3-4 years old....after replacing battery with a Brand new one i have not once used a charger. Have flashed over 50 times with Zero issues. If u have a new battery u r fine. If u have a battery that is over 3 years old u may need a charger........DME unlock takes 4-5 minutes. Map changing takes about 1.5 minutes....

[OneExtra]

Originally Posted by ssgm1x

i needed a battery charger cause my battery was like 3-4 years old....after replacing battery with a Brand new one i have not once used a charger. Have flashed over 50 times with Zero issues. If u have a new battery u r fine. If u have a battery that is over 3 years old u may need a charger........DME unlock takes 4-5 minutes. Map changing takes about 1.5 minutes....

A friend used Open Flash for the first time and it took 45 mins from start to finish.

Battery charger always reccommended, not worth the risk.

[Pikey Motorsports]

So I don’t need jb4?

[schnell1982]

If your voltage drops or something happens electrically wise during programming, you will regret that you didn't use a charger.
The Bootmod program will note to make sure battery voltage is stable.
It is 100% recommended for the initial read out-programming
Software updates occur within 1-2 minutes and do not require a voltage supply.

[schnell1982]

Originally Posted by Pikey Motorsports

So I don’t need jb4?

Throw your JB4 into the trash
Its an item of the past and their support is garbage
Lots of current issues with their recent units

[Pikey Motorsports]

I don’t have jb4.. I thought it was needed to control meth

[YanoM5]

Thanks for the info guys. I do have a battery charger. Any further comments on my 91 or 93 octane question?

[YanoM5]

Dumb Question: When flashing hookup the charger to the battery in the rear right? I though I read somewhere, there’s an easier option on the front?

[dsmclark]

run the 91 map and I have always attached the charger to the charge points under the hood! saves taking the floor up in the back

[YanoM5]

Originally Posted by dsmclark

run the 91 map and I have always attached the charger to the charge points under the hood! saves taking the floor up in the back

Is it pretty easy to find in the hood?

[dsmclark]

Originally Posted by YanoM5

Is it pretty easy to find in the hood?

Yeah there is a red cover on the positive terminal and then there is a metal bar for the negative just behind the headlight. its on the drivers side (right) in the UK not sure if its on the left in America

Edit: looks like its the same

[YanoM5]

Originally Posted by dsmclark

Yeah there is a red cover on the positive terminal and then there is a metal bar for the negative just behind the headlight. its on the drivers side (right) in the UK not sure if its on the left in America

Edit: looks like its the same

I figured it out. But thank you so much!

[irishbimmer]

For a 91 octane tune on a 2015 competition package- what are the estimated gains at the flywheel for hp and torque from stock?
thx

[Lightfytr]

I just did the Stage 1 93 Octane and its insane.