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Technical Topics B48 4-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications jb4 at 320i b48

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      08-30-2020, 03:02 PM   #1
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jb4 at 320i b48

here is my experiance with JB4 at 320i (stock@184hp).
here you can see the dragy reslults! I'm very satisfied with it.
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      08-30-2020, 06:34 PM   #2
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Dude, that's impressive! Thanks for sharing! What map will you keep it on for daily driving?
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      08-30-2020, 08:26 PM   #3
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Dude, that's impressive! Thanks for sharing! What map will you keep it on for daily driving?
I'm not the OP but I drive on map 2 now since its hot here in IL. In the winter, I was running map 3 with ~E30 blend. I'm running E25-E30 now but went to map 2. This car definitely feels slower when its hot outside (we've been having >85°F here).
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      08-31-2020, 04:47 AM   #4
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Dude, that's impressive! Thanks for sharing! What map will you keep it on for daily driving?
Daily at 1 or 2 is enough, good boost and in sport mode already fast enough. For drag map 3 of course.
I'm very happy on how car behaves.
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      08-31-2020, 08:22 AM   #5
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Daily at 1 or 2 is enough, good boost and in sport mode already fast enough. For drag map 3 of course.
I'm very happy on how car behaves.
My car feels the same in maps 2 and 3. Max boost is around 21psi on both maps. I use 2 in the summer just for peace of mind. I might even bump it down to 1 since IATs sky rocket when I go WOT on the highways here and it’s >90F. This car definitely needs a better heat management system. In the winter, I was on map 3 all the time and had absolutely no issues. Performance was much better too.
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      08-31-2020, 09:47 AM   #6
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Nice!
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      08-31-2020, 02:46 PM   #7
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Originally Posted by VipinLJ View Post
My car feels the same in maps 2 and 3. Max boost is around 21psi on both maps. I use 2 in the summer just for peace of mind. I might even bump it down to 1 since IATs sky rocket when I go WOT on the highways here and it’s >90F. This car definitely needs a better heat management system. In the winter, I was on map 3 all the time and had absolutely no issues. Performance was much better too.
Good choice ))
From what I know, MAP3 is an adjustable one. So it starts from +4 psi (same as MAP2) but if you push it more it can go up to +6psi, which is nice since its auto-adjustable.

Question of temperature is really important, yet I never have seen more that 108 (Celsius) even we have +32C outside nowadays. Bigger inter-cooler could be useful anyway, but I haven't seen one bolt on yet.
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      08-31-2020, 11:19 PM   #8
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Good choice ))
From what I know, MAP3 is an adjustable one. So it starts from +4 psi (same as MAP2) but if you push it more it can go up to +6psi, which is nice since its auto-adjustable.

Question of temperature is really important, yet I never have seen more that 108 (Celsius) even we have +32C outside nowadays. Bigger inter-cooler could be useful anyway, but I haven't seen one bolt on yet.
Wait. Your IAT hits 108degC??? Or 108F? I’m asking because I believe 108C is around 225F?
We have 32C temps here too. And mine goes to around 125-130F when going WOT. When I drive sedately, it’s around 105F. Sometimes even lower at around 99-100F. But yes. Never 108C!!
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      09-01-2020, 01:13 AM   #9
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Wait. Your IAT hits 108degC??? Or 108F? I’m asking because I believe 108C is around 225F?
We have 32C temps here too. And mine goes to around 125-130F when going WOT. When I drive sedately, it’s around 105F. Sometimes even lower at around 99-100F. But yes. Never 108C!!
You are right, IAT is around 105-120F (which is ~40C),
I was talking about Oil Temperature it's around 230F (110C)
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      09-01-2020, 01:40 AM   #10
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You are right, IAT is around 105-120F (which is ~40C),
I was talking about Oil Temperature it's around 230F (110C)
When you go WOT from standstill, what times does the app tell you? For 0-60.
Since you have a dragy too, I’m curious as to how the time the jb4 connect app shows compares to what the dragy shows.
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      09-01-2020, 07:47 AM   #11
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Originally Posted by VipinLJ View Post
When you go WOT from standstill, what times does the app tell you? For 0-60.
Since you have a dragy too, I’m curious as to how the time the jb4 connect app shows compares to what the dragy shows.
I did checked JB4 0-60 but it shows some nonsense...
so for any good testing get a dragy ))
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      09-01-2020, 06:23 PM   #12
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I did checked JB4 0-60 but it shows some nonsense...
so for any good testing get a dragy ))
Hehe. I know it wouldn't be accurate but what did you get? Just to know how far off the jb4 is is all. I used two GPS apps on my phone and it was almost spot on with what JB4 showed. I guess it also depends on the phone used. I used to use it on my one plus 6t and had zero issues with the GPS speed on it. On my galaxy s20, the GPS speed doesn't display a lot of the times and thus causes issues when logging.
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      09-03-2020, 10:53 AM   #13
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Originally Posted by VipinLJ View Post
Hehe. I know it wouldn't be accurate but what did you get? Just to know how far off the jb4 is is all. I used two GPS apps on my phone and it was almost spot on with what JB4 showed. I guess it also depends on the phone used. I used to use it on my one plus 6t and had zero issues with the GPS speed on it. On my galaxy s20, the GPS speed doesn't display a lot of the times and thus causes issues when logging.
I didn't get what it is ))
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      09-03-2020, 11:50 AM   #14
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I didn't get what it is ))
Wowzer. That is wayyyyy off!!! In mine, it shows believable times actually. I tested once with a dragy and it showed almost the same time. Just 0.1x seconds off. But it was with a friends box since I don’t have a dragy. So I couldn’t do more tests to see if it’s consisten.
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      09-03-2020, 12:35 PM   #15
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Wowzer. That is wayyyyy off!!! In mine, it shows believable times actually. I tested once with a dragy and it showed almost the same time. Just 0.1x seconds off. But it was with a friends box since I don’t have a dragy. So I couldn’t do more tests to see if it’s consisten.
Yeah, its pretty crzy with jb4 0-60 results, so I use dragy which was tested on different cars and I know more or less accurate ))
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