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      11-21-2023, 12:23 PM   #1
ajcool2
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21 M50i Before and After JB4 results

Wassup guys picked up my '21 M50i in September and I'm loving every second of it. Wanted to share my stock 1/4 mile times as well as my times after installing a JB4 this weekend. My best stock time was a 12.175@112 at the track. My best on the street with my draggy was 12.39@112. After installing the JB4 I was able to get a best of 11.84@116 on map 2 using the draggy(with a passenger). I did a run on map 1 and went 11.9@114. I'll be hitting the track as soon as possible to get new times. So far this is the fastest car I've owned. My nitrous 350z went 12.0@114 and my N/A 370z went 12.33@114.

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      11-21-2023, 03:45 PM   #2
cobramite
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Outstanding.
11.8 is killer especially at 5300 lbs.
There are many guys not getting 11.8 with the X5M
Looks like you picked up nealry half a second which is huge when you are already low 12s along with a 4 mile per hour gain @116.5
Your stock metrics are in line if not slightly better than the auto press testing results and it is nice to see this reproducable validation which should be noted by a couple posters here who claim that these professional evaluations reported in C&D, R&T, etc. are fake and made up BS. Obviously not.
Great job and Thanks for sharing. You rock!

Last edited by cobramite; 11-22-2023 at 09:16 AM..
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      11-21-2023, 05:30 PM   #3
raannathr333
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Dope! Quick whip.
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      11-21-2023, 05:39 PM   #4
cobramite
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^^^^^That's for sure, real quick!
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      11-25-2023, 05:18 PM   #5
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Quote:
Originally Posted by ajcool2 View Post
Wassup guys picked up my '21 M50i in September and I'm loving every second of it. Wanted to share my stock 1/4 mile times as well as my times after installing a JB4 this weekend. My best stock time was a 12.175@112 at the track. My best on the street with my draggy was 12.39@112. After installing the JB4 I was able to get a best of 11.84@116 on map 2 using the draggy(with a passenger). I did a run on map 1 and went 11.9@114. I'll be hitting the track as soon as possible to get new times. So far this is the fastest car I've owned. My nitrous 350z went 12.0@114 and my N/A 370z went 12.33@114.

Great video! I love seeing what the M50i can do. I never tried it with mine. That car was a beast; my best car yet. Unfortunately it was totaled so starting over with '24 M60i. How do mods like that affect our warranty?
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      12-01-2023, 11:56 AM   #6
PNWM50I
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thanks for sharing! I love my M50i and am running carbahn tune (piggy back), Dinan CAI, X5M intake ducts (removes silencers) and will likely thrown on the Dinan axleback as my xmas gift.

Perhaps I should also invest in a Draggy to see what she can do unofficially. Doubt it will be faster than your #s but this vid looks fun! The greatest part of the V8 is listening to how it roars under throttle. Its truly one of the few cars I've owned where I occasionally prefer listening to the motor while I drive over music.
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      12-01-2023, 01:54 PM   #7
cobramite
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Quote:
Originally Posted by PNWM50I View Post
thanks for sharing! I love my M50i and am running carbahn tune (piggy back), Dinan CAI, X5M intake ducts (removes silencers) and will likely thrown on the Dinan axleback as my xmas gift.

Perhaps I should also invest in a Draggy to see what she can do unofficially. Doubt it will be faster than your #s but this vid looks fun! The greatest part of the V8 is listening to how it roars under throttle. Its truly one of the few cars I've owned where I occasionally prefer listening to the motor while I drive over music.
Are you happy with the gain from the Carbahn piggyback, good SOTP bump?
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      12-01-2023, 02:39 PM   #8
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Quote:
Originally Posted by cobramite View Post
Are you happy with the gain from the Carbahn piggyback, good SOTP bump?
I had the racehip but found the shifts aggressive/harsh (don't want to say rough but it wasn't smooth) when in sport + mode from 0-60 when WOT. I am happy with the throttle response from Carbahn and more happy with the smoothness/crisp shifts when WOT.
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      12-01-2023, 03:20 PM   #9
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Quote:
Originally Posted by PNWM50I View Post
I had the racehip but found the shifts aggressive/harsh (don't want to say rough but it wasn't smooth) when in sport + mode from 0-60 when WOT. I am happy with the throttle response from Carbahn and more happy with the smoothness/crisp shifts when WOT.
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      03-24-2024, 02:30 AM   #10
ajcool2
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Quick update..logged a draggy run with 3 gallons of E85 and got a new personal best.
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