[petrosexxual]

Hey guys,

I recently installed a BMS JB+ tune on my ///M240i (6/MT), have been running it at the default 4psi setting for about 2 days now. 90% of the time the increase in power is quite thrilling, but from time to time I experience the engine cutting off or hesitation under WOT. This generally occurs in higher gears, 3 and 4. I'm quite sure Socal 91 Octane has something to do with it...I may bring the boost level down to see if the issue is resolved. Any other suggestions or similar experiences out there?

Thanks!

[AlexM240i]

Suscribed.

[havinfun]

Originally Posted by petrosexxual

Hey guys,

I recently installed a BMS JB+ tune on my ///M240i (6/MT), have been running it at the default 4psi setting for about 2 days now. 90% of the time the increase in power is quite thrilling, but from time to time I experience the engine cutting off or hesitation under WOT. This generally occurs in higher gears, 3 and 4. I'm quite sure Socal 91 Octane has something to do with it...I may bring the boost level down to see if the issue is resolved. Any other suggestions or similar experiences out there?

Thanks!

I am running the same set up (M240i 6/MT) with the JB+. I use either 92 octane Shell or 91 octane Murphy gas (neither has ethanol). I have my JB+ set at the default boost setting (which I believe is 3.5 psi). I don't experience any hesitation, just more torque at lower RPM . . . nice! However, I must admit that roads where I live are winding, hilly, and speed limits are generally 45 or 55 mph. I have never found a place to accelerate safely WOT in 3 or 4th gear while still avoiding flashing red lights. So I probably am not putting the JB+ to the test like you. If hesitation continues for you, I'd back off the boost setting slightly.

[Rockstar1487]

Originally Posted by petrosexxual

Hey guys,

I recently installed a BMS JB+ tune on my ///M240i (6/MT), have been running it at the default 4psi setting for about 2 days now. 90% of the time the increase in power is quite thrilling, but from time to time I experience the engine cutting off or hesitation under WOT. This generally occurs in higher gears, 3 and 4. I'm quite sure Socal 91 Octane has something to do with it...I may bring the boost level down to see if the issue is resolved. Any other suggestions or similar experiences out there?

Thanks!

I run this with the 8ZF and have not had any issues or hesitations. I have plenty of space when entering the highway and usually crush it every time. I buy 93 octane from Sunoco. I really like the jb+, had one on my n54 135 also didn’t have any issues then either.

[AlexM240i]

Originally Posted by Rockstar1487

I run this with the 8ZF and have not had any issues or hesitations. I have plenty of space when entering the highway and usually crush it every time. I buy 93 octane from Sunoco. I really like the jb+, had one on my n54 135 also didn’t have any issues then either.

Did you install it yourself ?

[Rockstar1487]

Yes on both cars.

[bryan_G01]

I ran jb+ on n54 as well, no issues and run it on the n55 ontop of a flash tune without any problems.

I also installed one on a completely stock n55 m235 and hasn't had a problem either.

Could be octane, could be shitty gas, bad plugs, etc..

[mike@x-ph.com]

OP you need to datalog, You probably need to change your spark plugs ... Bringing the boost down will help but eventually they will fail even on stock car.

[JuarezRichard]

I had the same issues and it got fixed with octane booster no 93 octane in El Paso Texas area therefore the issue is related to the octane.

[AlexM240i]

Having the same issue with my JB+ even using octane booster in my 8Auto M240i. I had to turn the dial to half boost to prevent the laggy shifting. Not happy with it....

[petrosexxual]

Originally Posted by havinfun

I am running the same set up (M240i 6/MT) with the JB+. I use either 92 octane Shell or 91 octane Murphy gas (neither has ethanol). I have my JB+ set at the default boost setting (which I believe is 3.5 psi). I don't experience any hesitation, just more torque at lower RPM . . . nice! However, I must admit that roads where I live are winding, hilly, and speed limits are generally 45 or 55 mph. I have never found a place to accelerate safely WOT in 3 or 4th gear while still avoiding flashing red lights. So I probably am not putting the JB+ to the test like you. If hesitation continues for you, I'd back off the boost setting slightly.

Very long delay getting back to you, nice hearing some feedback out there! I believe the default setting from BMS is set to +4 psi, and you can turn it up to a maximum of 4.5+ psi. After adjusting the JB+ Boost Control setting to +3 psi, I have experienced less hesitation and knocking. The delivery of power further improved when adding octane booster to the standard garbage 91 octane we get in California. There is no doubt in mind the car is significantly quicker, but the inconsistency in power delivery(5% of the time not good) concerns me deep inside. I have stopped using octane booster as I cannot expect this to be very good for the injectors in the long run?

[petrosexxual]

Originally Posted by Rockstar1487

I run this with the 8ZF and have not had any issues or hesitations. I have plenty of space when entering the highway and usually crush it every time. I buy 93 octane from Sunoco. I really like the jb+, had one on my n54 135 also didn’t have any issues then either.

That is great to hear! I cannot say I've had an entirely smooth experience the last month or so. I believe it has a lot to do with 91 octane out here in California, I envy your access to 93 octane! I wonder if having a manual transmission also create a few variables. Clearly if the clutch gets hot from a hard take off or launch, there maybe some clutch slippage not allowing all the power to be put down to the ground?

[petrosexxual]

Originally Posted by bryan_f22

I ran jb+ on n54 as well, no issues and run it on the n55 ontop of a flash tune without any problems.

I also installed one on a completely stock n55 m235 and hasn't had a problem either.

Could be octane, could be shitty gas, bad plugs, etc..

Yes the mystery of what the issue is still bothers me. I did not have much issues with my N55 135i, and many friends with N54 E90/2 or E82 had a pretty smooth experience.

[petrosexxual]

Originally Posted by AlexM240i

Having the same issue with my JB+ even using octane booster in my 8Auto M240i. I had to turn the dial to half boost to prevent the laggy shifting. Not happy with it....

So having some issues with 8AT M240i as well? I was convinced it had to with clutch slippage, but it does seem like Octane is the primary issue. Octane booster has helped, it's a shame we have to turn the boost down a few notches. When I tried 4.5+ psi and things ran smoothly for a few brief moments, the power was incredible! But all in all, whether +2psi or +3 psi, the performance gain is still great considering it's less than $200, and very easy to remove and install. I recently installed a AWE exhaust as well, I feel like this initially caused a bit more hesitation, but after 200 miles or so, all was relatively smooth 95% of the time.

[petrosexxual]

Originally Posted by JuarezRichard

I had the same issues and it got fixed with octane booster no 93 octane in El Paso Texas area therefore the issue is related to the octane.

Good to know! What are your thoughts on continuous use of Octane Booster? I'm tempted on every fill up, but have stopped using it the last 3 weeks.

[petrosexxual]

Originally Posted by mike@x-ph.com

OP you need to datalog, You probably need to change your spark plugs ... Bringing the boost down will help but eventually they will fail even on stock car.

Not a bad idea Mike! Probably will provide the most definitive answer or atleast eliminate some variables. I just figured at 3.5k miles on the odometer, my spark plugs should be pretty good? I recall N20 users often suggesting the use of S55 Spark Plugs for tuned engines. BTW thanks for the awesome shopping experience, I just installed the AWE exhaust before New Years. It has completely transformed the car. I'm shifting better with the enhanced sound, the pops and bangs never get old. Catted downpipes and suspension are next on the list

[petrosexxual]

Some fun with the AWE Exhaust. I should get better videos soon, this was just pure hoonigan behavior. This is what happens when your visiting the family for the holidays and the your younger brother's friends want you to do a burnout.

[MarcoZandrini]

Originally Posted by Rockstar1487

I run this with the 8ZF and have not had any issues or hesitations. I have plenty of space when entering the highway and usually crush it every time. I buy 93 octane from Sunoco. I really like the jb+, had one on my n54 135 also didn’t have any issues then either.

On soapbox!
Sunoco gas doesn’t meet BMW’s standard for injector cleaning. Basically, the only gas you should put in the car comes from a gas station that sells top tier gas. See www.toptiergas.com.
Off soapbox!
I replaced the injector o-rings on my now departed 2001 E46. The only gas I put in the tank was top tier gas. The bizness end of each injector was pristine. I credit the cleaning additive package in the gas for the injectors’ condition.

[Rockstar1487]

Originally Posted by MarcoZandrini

On soapbox!
Sunoco gas doesn’t meet BMW’s standard for injector cleaning. Basically, the only gas you should put in the car comes from a gas station that sells top tier gas. See www.toptiergas.com.
Off soapbox!
I replaced the injector o-rings on my now departed 2001 E46. The only gas I put in the tank was top tier gas. The bizness end of each injector was pristine. I credit the cleaning additive package in the gas for the injectors’ condition.

On soapbox!
Sunoco is on the list of top tier gas! you should’ve looked at the website
Off soap box!
Cool story bro Sunoco ultra 93 is on the list of top tier gas!

[rickd]

I get the same hesitation from my Dinan tune as well, I'm pretty sure that it's California hippy gas causing the issue. I've put in 3 gallons of 100 and the rest 91 to make 93, didn't notice the issue as much. I do see inconsistent power deliver as you do with the JB4 tune, maybe heat soak, I don't know but it sure is annoying.

[DailySleeper]

Originally Posted by rickd

I get the same hesitation from my Dinan tune as well, I'm pretty sure that it's California hippy gas causing the issue. I've put in 3 gallons of 100 and the rest 91 to make 93, didn't notice the issue as much. I do see inconsistent power deliver as you do with the JB4 tune, maybe heat soak, I don't know but it sure is annoying.

Sport or Elite?

[Lew Carrum]

91 octane? what sort of crap is that, don't they give you tidy stuff over there.