Drivetrain Burger Motorsports (BMS) Tune(s)
#626
so over the past few days ive noticed some light RPM fluctuation at idle, mostly at startup, never really gave me any reason to worry though.....however today, i went to start my car and the RPMs seemed to fluctuate a lot more and my car eventually stalled out. it started right back up and seemed to run fine, so if its a one time thing i wont really concern myself with it......just curious if anyone has experienced anything similar?
#627
#628
Join Date: Sep 2007
Location: terry@burgertuning.com
Posts: 519
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I've had maybe 2-3 people mention a slightly rougher cold high idle with the JB+ installed. Like a fluctuation of 75rpm where it used to fluctuate at 50rpm. For like the first 20 seconds on startup. The high cold idle is obviously very sensitive to MAF signals so its possible some smoothing algorithm, etc, in the JB+ is having a negative effect there. It's not something I've been able to look in to yet but if anyone can recreate the issue on demand wants to trade cars for a few days I'd be happy to look at it again.
#629
I've had maybe 2-3 people mention a slightly rougher cold high idle with the JB+ installed. Like a fluctuation of 75rpm where it used to fluctuate at 50rpm. For like the first 20 seconds on startup. The high cold idle is obviously very sensitive to MAF signals so its possible some smoothing algorithm, etc, in the JB+ is having a negative effect there. It's not something I've been able to look in to yet but if anyone can recreate the issue on demand wants to trade cars for a few days I'd be happy to look at it again.
By the way, this is Nate with the 2011 black MCS here in Simi. I can arrange to swap cars anytime next week. Let me know via a PM or email if you'd like me to.
#630
I've had maybe 2-3 people mention a slightly rougher cold high idle with the JB+ installed. Like a fluctuation of 75rpm where it used to fluctuate at 50rpm. For like the first 20 seconds on startup. The high cold idle is obviously very sensitive to MAF signals so its possible some smoothing algorithm, etc, in the JB+ is having a negative effect there. It's not something I've been able to look in to yet but if anyone can recreate the issue on demand wants to trade cars for a few days I'd be happy to look at it again.
i mentioned this occasional stutter in my idle on cold(er) starts a couple of months ago. it still happens occasionally. i originally thought it may have been the hpfp, but that has since been replaced. i haven't really read how much of a dip there is since it usually happens during the needle sweep. next time i start my car after a cool night, i'll pull the CAN tool off and see if i can see the drop in rpm. i wonder if it ever happened when you had my car for those few days, and maybe just didn't even notice it. i'll try to keep an eye out for this.
#631
Join Date: Sep 2007
Location: terry@burgertuning.com
Posts: 519
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On the cold idle I'm not sure its anything we need to bother with. But, when time permits I'll look in to it.
Also did an install on a local GP today which has the JCW setup. During our impromptu testing it was putting out around 16psi stock and around 19psi with the JB+ at 33%. The owner is planning on using 30% E85 so we'll see how it goes.
Also did an install on a local GP today which has the JCW setup. During our impromptu testing it was putting out around 16psi stock and around 19psi with the JB+ at 33%. The owner is planning on using 30% E85 so we'll see how it goes.
#632
Installed mine today. Here are some initial comments, several runs this morning while heading to work, sport button engaged, using Torque peak boost 13.2.
Installed JB+ just before my drive home. Got on the highway and was stuck in traffic. Discouraged by the traffic I forgot about it. About 10 minutes later I noticed the pop and burble increased or was louder? Normally can't hear it over the radio, could now. It was obvious. Eventually traffic eased for a few minutes and I got on it to jump past a few people and merge. I looked down and Torque peaked my boost at 16.1. By the time I made it off the highway the car felt really responsive. I decided to get on it and the front end started hopping, I couldn't get traction. Average boost driving aggressively (not wot) was 15.4.
So where did the ecu learning period of 50 to 100 miles come from. I drove a total of 12. Felt immediate difference at like mile 6. I'm about to take it out for an extended drive. Am I about to feel even more?
Initial impressions? This is great.
Installed JB+ just before my drive home. Got on the highway and was stuck in traffic. Discouraged by the traffic I forgot about it. About 10 minutes later I noticed the pop and burble increased or was louder? Normally can't hear it over the radio, could now. It was obvious. Eventually traffic eased for a few minutes and I got on it to jump past a few people and merge. I looked down and Torque peaked my boost at 16.1. By the time I made it off the highway the car felt really responsive. I decided to get on it and the front end started hopping, I couldn't get traction. Average boost driving aggressively (not wot) was 15.4.
So where did the ecu learning period of 50 to 100 miles come from. I drove a total of 12. Felt immediate difference at like mile 6. I'm about to take it out for an extended drive. Am I about to feel even more?
Initial impressions? This is great.
#633
#634
I turned my JB+ to 7. I'm using 93 octane fuel. Does anyone have experience doing this? I have an automatic. I was hoping that this tuner would make me like having an auto more but it just makes me long for a manual so much. I am addicted to the power. I've become a junkie !
#636
What gear and rpm were you at when you hit 16.1? I was playing around today and only got a peak boost of 14.7 with the scan gauge2.
Installed mine today. Here are some initial comments, several runs this morning while heading to work, sport button engaged, using Torque peak boost 13.2.
Installed JB+ just before my drive home. Got on the highway and was stuck in traffic. Discouraged by the traffic I forgot about it. About 10 minutes later I noticed the pop and burble increased or was louder? Normally can't hear it over the radio, could now. It was obvious. Eventually traffic eased for a few minutes and I got on it to jump past a few people and merge. I looked down and Torque peaked my boost at 16.1. By the time I made it off the highway the car felt really responsive. I decided to get on it and the front end started hopping, I couldn't get traction. Average boost driving aggressively (not wot) was 15.4.
So where did the ecu learning period of 50 to 100 miles come from. I drove a total of 12. Felt immediate difference at like mile 6. I'm about to take it out for an extended drive. Am I about to feel even more?
Initial impressions? This is great.
Installed JB+ just before my drive home. Got on the highway and was stuck in traffic. Discouraged by the traffic I forgot about it. About 10 minutes later I noticed the pop and burble increased or was louder? Normally can't hear it over the radio, could now. It was obvious. Eventually traffic eased for a few minutes and I got on it to jump past a few people and merge. I looked down and Torque peaked my boost at 16.1. By the time I made it off the highway the car felt really responsive. I decided to get on it and the front end started hopping, I couldn't get traction. Average boost driving aggressively (not wot) was 15.4.
So where did the ecu learning period of 50 to 100 miles come from. I drove a total of 12. Felt immediate difference at like mile 6. I'm about to take it out for an extended drive. Am I about to feel even more?
Initial impressions? This is great.
#637
I turned my JB+ to 7. I'm using 93 octane fuel. Does anyone have experience doing this? I have an automatic. I was hoping that this tuner would make me like having an auto more but it just makes me long for a manual so much. I am addicted to the power. I've become a junkie !
Seems like more and more people are getting more and more daring to adjust the JB. I have an auto, run 93 all the time, have a larger intercooler, colder plugs and a bunch of other mods but still left it on the stock setting as advised by Terry.
#640
#641
Have an automatic. Have not messed with the JB+. Just installed and have done a total of 56 miles. I felt a difference immediately. Measured with Torque which seems to be dead on with my ProSport gauge. Averaging 16.1-16.4 It's nuts...
#642
After turning the JB+ up to 7 all I can say is wow! I think I read that Terry turned his up to 7 when he was doing his 1/4 mile runs with no problems. I am little hesitant to run it as hard as it will go. Just stomping the gas it really accelerates now. I am sure I wont go any higher than 7. it is starting to have torque steer now. I might back it off to 6 just to be safe.
#644
#645
Little tough to give a brief explanation, but here it goes.
Ignition is read in degrees. So on the speedo, 10 is 1 degree of timing, 70 is 7 degrees of timing, 160 is 16 degrees of timing.
Degrees is dealing with the angle of the crankshaft. Save that explanation for another day lol.
As your engine speed increases so should the spark advance. You want the spark to ignite BTDC( before top dead center).
*When the piston is at it's highest point in the compression stroke.
You'd want this because as the piston moves down it's power stroke the combustion that happen a split second earlier will push that piston down, making it efficient since it's maximizing the pressure.
If it the ignition happen at TDC or after, then you're losing efficiency because the engine isn't maximizing on the peak pressure that occurs. You want the expanding gases to work for you. If the ignition is off by a bit, you lose power and mpgs.
I need my coffee lol
Ignition is read in degrees. So on the speedo, 10 is 1 degree of timing, 70 is 7 degrees of timing, 160 is 16 degrees of timing.
Degrees is dealing with the angle of the crankshaft. Save that explanation for another day lol.
As your engine speed increases so should the spark advance. You want the spark to ignite BTDC( before top dead center).
*When the piston is at it's highest point in the compression stroke.
You'd want this because as the piston moves down it's power stroke the combustion that happen a split second earlier will push that piston down, making it efficient since it's maximizing the pressure.
If it the ignition happen at TDC or after, then you're losing efficiency because the engine isn't maximizing on the peak pressure that occurs. You want the expanding gases to work for you. If the ignition is off by a bit, you lose power and mpgs.
I need my coffee lol
#647
Also remember that it is possible to be "bad" gas every now and then.
#648
Theoretically yes. But there are many more variables that are in play.
Example, If you're cruising as partial throttle you're timing advance can be 36degree, move you're foot a bit then it's 18 degrees. It's all over the place, which is normal.
The reason Terry cautions folks about changing the JB is because some people aren't running sufficient octane. The higher the octane, the more compression it can withstand before it randomly ignites( not due to ignition).
If you up the boost, you're forcing more air into the engine/cylinders, if the octane isn't high enough you get pre-ignition, aka knock. Then timing gets pulled. These cars have pretty good knock sensors.
But if the knock is bad enough.......well we know it's not Terry's fault for what happens to the engine!
Example, If you're cruising as partial throttle you're timing advance can be 36degree, move you're foot a bit then it's 18 degrees. It's all over the place, which is normal.
The reason Terry cautions folks about changing the JB is because some people aren't running sufficient octane. The higher the octane, the more compression it can withstand before it randomly ignites( not due to ignition).
If you up the boost, you're forcing more air into the engine/cylinders, if the octane isn't high enough you get pre-ignition, aka knock. Then timing gets pulled. These cars have pretty good knock sensors.
But if the knock is bad enough.......well we know it's not Terry's fault for what happens to the engine!
#649