I have a 09 135i with the N54 that I recently installed JB4 + DCI onto. I have been a long time lurker, but I never had much to post about since I have managed to keep the car stock. But, the warranty is getting close to the end and I couldn't resist any longer. In the past I have owned a couple 328i's, an E36 M3, a couple DSM's, an EVO VII, a WRX, an STi, an Audi A4 and S4... I have a good amount of experience tuning vehicles, especially turbo platforms.
Anyway, the JB4 install was painless and everything worked on the first try. The car pulls smoothly and feels like a factory tune. All good stuff. I am big on quantifying performance data from the car, so I took a bunch of logs. I wanted to compare the stock map to JB4 map 1 and 2 on pump fuel... with the stock intake and then again with the DCI.
The first thing I noticed was that the time stamps produced by the JB4 logs do not seem to be reliable. After taking about five logs and comparing them, I realized the JB4 time stamps tend to be inconsistent and extremely optimistic, so there was no way of really determining if the car had become faster from just the JB4 logs. So, I used the Force app for Android which uses the accelerometer and GPS sensor to determine the cars acceleration, power and torque from here: http://ift.tt/1sksMtV. Force gave me some good time stamps and power estimations and then I used the JB4 interface to log the vehicle sensors, mainly boost, timing advance and iat. Force will log the car via the OBDII sensor and also check and clear the engine codes, however, as soon as you touch the throttle with JB4 the OBDII sensor stops sending data. You can still clear check and clear codes, however. I just leave the OBDII bluetooth connector plugged into the car so I don’t have to drag output my computer to read codes… kind of handy.
I have an empty, flat, two mile stretch of road to do my logs. The car gets lots of cool down time at highway speeds between pulls so heat soak shouldn't be an issue. I had 91 octane in the car, it was about 80 degrees outside and the ambient air pressure was about 12psi (I live outside of Denver, 6000ft).
Summary for those that don’t want to read through the logs:
The Fastest:
Highest peak power and torque: Map 1 with a stock intake -> 314 ft/lb, 326 whp
Highest average power and torque under curve: Map 2 with a stock intake -> 255 ft/lb, 192 whp
Fastest 60-90mph: Map 2 with a stock intake -> 4.034 seconds
The Slowest:
Lowest peak power and torque: Stock map with the DCI -> 276 ft/lb, 281 whp
Lowest average power and torque under curve: Stock map with DCI -> 230 ft/lb, 171 whp
Slowest 60-09mph: Stock map with DCI -> 4.723 seconds
The Gains:
Peak power and Torque: 38 ft/lb, 45whp
60-90mph: 0.689 seconds
Conclusions:
JB4 has very decent gains for the money. The DCI did not improve performance, I am not sure why. They IAT’s didn’t seem to increase, so perhaps something with the fueling. I think the IAT's are really hurting performance, so water injection or a FMIC is probably a better bet than an exhaust for now.
JB4 maps 0-2 with the stock intake.
The car makes a peak of about 280ft/lb at the wheels on the stock map and about 320ft/lb at the wheels on map 1 and 2. A gain of about 40ft/lb at the wheels. You can see map 2 making a good bit more torque up top than map 1.
The car had a peak acceleration of 0.35g's on the stock map and 0.4g's on map 1 and 2. You can see map 2 pulling the hardest up top.
The car accelerated from 60-90mph about 0.7ths of a second faster going from the stock map to map 2, which is an impressive gain. Anything that can run 60-90mph at 6,000ft in less than 4 seconds on pump fuel is quite fast.
The corresponding boost log from JB4. You can see why map 2 makes more power up top and was faster from 60-90mph.
The timing advance log from JB4. The timing is poor, even on map 1. Time to consider water injection or a bigger intercooler. When it gets cooler, the timing will probably improve a great deal.
The iat log from JB4. Almost a 20 degree delta, not good. Again, time for water injection or an better intercooler.
JB4 maps 0-2 with the DCI.
The short of it is that the car was actually slightly (and I mean slightly) slower with the DCI vs the stock intake on all three maps. It took me about a half hour to install the DCI and the temperature outside went from 84 degrees to 86 degrees, but other than that, nothing changed. I can't say I see a performance gain.
The torque and power...
The acceleration...
The 60-90mph times...
The boost...
The ignition timing...
The iat...
Individual Maps Stock Intake vs DCI
I thought the DCI result was interesting, so I broke each map down into stock intake vs DCI comparisons if you are interested. The iats and timing stay about the same, so the DCI sucking hot air is probably not the issue. If I had to guess, my car just isn't making enough power for the stock intake to become a restriction.
Stock Map:
Map 1:
Map 2:
Anyway, the JB4 install was painless and everything worked on the first try. The car pulls smoothly and feels like a factory tune. All good stuff. I am big on quantifying performance data from the car, so I took a bunch of logs. I wanted to compare the stock map to JB4 map 1 and 2 on pump fuel... with the stock intake and then again with the DCI.
The first thing I noticed was that the time stamps produced by the JB4 logs do not seem to be reliable. After taking about five logs and comparing them, I realized the JB4 time stamps tend to be inconsistent and extremely optimistic, so there was no way of really determining if the car had become faster from just the JB4 logs. So, I used the Force app for Android which uses the accelerometer and GPS sensor to determine the cars acceleration, power and torque from here: http://ift.tt/1sksMtV. Force gave me some good time stamps and power estimations and then I used the JB4 interface to log the vehicle sensors, mainly boost, timing advance and iat. Force will log the car via the OBDII sensor and also check and clear the engine codes, however, as soon as you touch the throttle with JB4 the OBDII sensor stops sending data. You can still clear check and clear codes, however. I just leave the OBDII bluetooth connector plugged into the car so I don’t have to drag output my computer to read codes… kind of handy.
I have an empty, flat, two mile stretch of road to do my logs. The car gets lots of cool down time at highway speeds between pulls so heat soak shouldn't be an issue. I had 91 octane in the car, it was about 80 degrees outside and the ambient air pressure was about 12psi (I live outside of Denver, 6000ft).
Summary for those that don’t want to read through the logs:
The Fastest:
Highest peak power and torque: Map 1 with a stock intake -> 314 ft/lb, 326 whp
Highest average power and torque under curve: Map 2 with a stock intake -> 255 ft/lb, 192 whp
Fastest 60-90mph: Map 2 with a stock intake -> 4.034 seconds
The Slowest:
Lowest peak power and torque: Stock map with the DCI -> 276 ft/lb, 281 whp
Lowest average power and torque under curve: Stock map with DCI -> 230 ft/lb, 171 whp
Slowest 60-09mph: Stock map with DCI -> 4.723 seconds
The Gains:
Peak power and Torque: 38 ft/lb, 45whp
60-90mph: 0.689 seconds
Conclusions:
JB4 has very decent gains for the money. The DCI did not improve performance, I am not sure why. They IAT’s didn’t seem to increase, so perhaps something with the fueling. I think the IAT's are really hurting performance, so water injection or a FMIC is probably a better bet than an exhaust for now.
JB4 maps 0-2 with the stock intake.
The car makes a peak of about 280ft/lb at the wheels on the stock map and about 320ft/lb at the wheels on map 1 and 2. A gain of about 40ft/lb at the wheels. You can see map 2 making a good bit more torque up top than map 1.
The car had a peak acceleration of 0.35g's on the stock map and 0.4g's on map 1 and 2. You can see map 2 pulling the hardest up top.
The car accelerated from 60-90mph about 0.7ths of a second faster going from the stock map to map 2, which is an impressive gain. Anything that can run 60-90mph at 6,000ft in less than 4 seconds on pump fuel is quite fast.
The corresponding boost log from JB4. You can see why map 2 makes more power up top and was faster from 60-90mph.
The timing advance log from JB4. The timing is poor, even on map 1. Time to consider water injection or a bigger intercooler. When it gets cooler, the timing will probably improve a great deal.
The iat log from JB4. Almost a 20 degree delta, not good. Again, time for water injection or an better intercooler.
JB4 maps 0-2 with the DCI.
The short of it is that the car was actually slightly (and I mean slightly) slower with the DCI vs the stock intake on all three maps. It took me about a half hour to install the DCI and the temperature outside went from 84 degrees to 86 degrees, but other than that, nothing changed. I can't say I see a performance gain.
The torque and power...
The acceleration...
The 60-90mph times...
The boost...
The ignition timing...
The iat...
Individual Maps Stock Intake vs DCI
I thought the DCI result was interesting, so I broke each map down into stock intake vs DCI comparisons if you are interested. The iats and timing stay about the same, so the DCI sucking hot air is probably not the issue. If I had to guess, my car just isn't making enough power for the stock intake to become a restriction.
Stock Map:
Map 1:
Map 2:
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