JB4: any supporting mods necessary?
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c450
JB4: any supporting mods necessary?
Hey guys, I searched around and didn't find anything conclusive about this....
On my BMW, it was nearly mandatory, and in my case I found out the hard way, that you upgrade to an aluminum charge pipe to support adding the JB4.
Are there any gotchas like this for c43/c450?
Thanks in advance,
Soon to be another JB4'd w205!
On my BMW, it was nearly mandatory, and in my case I found out the hard way, that you upgrade to an aluminum charge pipe to support adding the JB4.
Are there any gotchas like this for c43/c450?
Thanks in advance,
Soon to be another JB4'd w205!
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2004 E55 K Wagon &. '96 SL500
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'16 AMG GTS, '21 AMG GLE53
No additional mods are required, but the car is highly sensitive to fuel and atmospheric variables (elevation, temp, air density altitude). This is not a symptom of the JB4, but the car itself. Many run E30 fuel mixtures (+/-5gal of E85 per tank) coupled with making a custom map for themselves based on conditions. These people have seen the fastest times on an otherwise completely stock car.
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c450
Thanks guys for the input. It is a 2016, so I suppose not as much of a concern in that regard.
I did run e30 mix on my BMW and it was a huge difference between that and just 93 octane, but I had my fair share of issues, so I will likely be taking it really slowly there. And yeah, probably will add supporting mods later to improve power, but right now I'm just making sure there aren't any stock parts that would have trouble with the tune.
I did run e30 mix on my BMW and it was a huge difference between that and just 93 octane, but I had my fair share of issues, so I will likely be taking it really slowly there. And yeah, probably will add supporting mods later to improve power, but right now I'm just making sure there aren't any stock parts that would have trouble with the tune.
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'16 AMG GTS, '21 AMG GLE53
Something to keep in mind since someone mentioned down pipes...JB4 doesn't remove any CEL's resulting from downpipes. Can only be done with ECU coding. I know people used to use extra spacers to pull back the O2 sensor to trick the system, but I don't know if anyone has done that on our cars. Plus, no major proven gains with DPs that you'd expect on a turbo car, even with tunes...at least no gains anyone is really posting about.
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From: Simi Valley, California
2018 C63 Sedan
No supporting mods needed, just plug n play and enjoy the new found power! 
If you feel you want more, go ahead and attach the fuel wire and do a mile ethanol blend like you've done in the past.
Change the maps and enjoy more gains
Once the mod bug hits, don't forget to add our intakes:
https://burgertuning.com/products/bm...9edf9003&_ss=r
Those will help you too!
-Payam
If you feel you want more, go ahead and attach the fuel wire and do a mile ethanol blend like you've done in the past.
Change the maps and enjoy more gains
Once the mod bug hits, don't forget to add our intakes:
https://burgertuning.com/products/bm...9edf9003&_ss=r
Those will help you too!
-Payam
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From: UK
2004 E55 K Wagon &. '96 SL500
Something to keep in mind since someone mentioned down pipes...JB4 doesn't remove any CEL's resulting from downpipes. Can only be done with ECU coding. I know people used to use extra spacers to pull back the O2 sensor to trick the system, but I don't know if anyone has done that on our cars. Plus, no major proven gains with DPs that you'd expect on a turbo car, even with tunes...at least no gains anyone is really posting about.
I've done loads of runs and they're all fairly consistent for the inclement weather.
The Tune & Downpipe cars are doing consistent mid to low 3s 0-60 and mid to low 11s, and trap speeds at 120 or more.
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c450
The bigger, catless DPs must be making more power and torque from what I've seen. I look at the Dragy leaderboards every month, mine is tune only, and in my Estate best times are 3.56 0 - 60 and 11.81 1/4 mile at 115.
I've done loads of runs and they're all fairly consistent for the inclement weather.
The Tune & Downpipe cars are doing consistent mid to low 3s 0-60 and mid to low 11s, and trap speeds at 120 or more.
I've done loads of runs and they're all fairly consistent for the inclement weather.
The Tune & Downpipe cars are doing consistent mid to low 3s 0-60 and mid to low 11s, and trap speeds at 120 or more.
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From: Michigan
2017 C43 AMG
no extra mods needed which make this car awesome. the tuning ceiling is relatively low though without major upgrades which makes this car awesome and not at the same time.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
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Newbie
Joined: Sep 2019
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c450
no extra mods needed which make this car awesome. the tuning ceiling is relatively low though without major upgrades which makes this car awesome and not at the same time.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
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Joined: Oct 2017
Posts: 419
Likes: 132
From: UK
2004 E55 K Wagon &. '96 SL500
no extra mods needed which make this car awesome. the tuning ceiling is relatively low though without major upgrades which makes this car awesome and not at the same time.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
Member
Joined: Jun 2019
Posts: 86
Likes: 15
2020 C43
no extra mods needed which make this car awesome. the tuning ceiling is relatively low though without major upgrades which makes this car awesome and not at the same time.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
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From: Michigan
2017 C43 AMG
the BMS and MSP or whatever the name of that other company intakes allow more flow it seems but if you sit, the hot air in engine bay kills it. so they may be ok if you are rolling and getting fresh air but not from a dig or waiting in line at the drag strip. id look into modifying the stock air intakes or fabbing my own with carbon fiber before buying those.
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From: Michigan
2017 C43 AMG
you dont need the green wire, but with green wire, car runs much more consistent. the fueling system adapts quickly to outside temps and boost levels. if you hit the max trim on full throttle its going to cut back because of stock tune. so only in perfect conditions will it boost well for you. green wire also helps to compensate for the e85 mixes. so id say always run green plug with any e85 mix, and even if you dont run e85 the green plug still helps to get more consistent performance.
i have K&N air filters. I did not buy any of the hot air intake systems. i use oem intakes with K&N filters.
the BMS and MSP or whatever the name of that other company intakes allow more flow it seems but if you sit, the hot air in engine bay kills it. so they may be ok if you are rolling and getting fresh air but not from a dig or waiting in line at the drag strip. id look into modifying the stock air intakes or fabbing my own with carbon fiber before buying those.
the BMS and MSP or whatever the name of that other company intakes allow more flow it seems but if you sit, the hot air in engine bay kills it. so they may be ok if you are rolling and getting fresh air but not from a dig or waiting in line at the drag strip. id look into modifying the stock air intakes or fabbing my own with carbon fiber before buying those.
lol uh oh. there gonna be upset you said this. pretty much though. Actually just bought these after trying the BMS:
quality is insane for the price. Didn't want to justify $100 for new filters and wasn't going to run these unless they turned out looking impeccable on arrival.
debating additional mods to the factory boxes - but weary as replacement units are pricey.
If they're good quality though 
added to my wish list!
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Joined: Feb 2017
Posts: 1,283
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From: Michigan
2017 C43 AMG
lol uh oh. there gonna be upset you said this. pretty much though. Actually just bought these after trying the BMS:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
quality is insane for the price. Didn't want to justify $100 for new filters and wasn't going to run these unless they turned out looking impeccable on arrival.
debating additional mods to the factory boxes - but weary as replacement units are pricey.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
quality is insane for the price. Didn't want to justify $100 for new filters and wasn't going to run these unless they turned out looking impeccable on arrival.
debating additional mods to the factory boxes - but weary as replacement units are pricey.
if you combined BMS filter and intake tubing system with a carbon cavity system to oem intake points that would be sick.
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Joined: Aug 2019
Posts: 43
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From: Rockville, MD
2013 BMW 335is, 2019 Mercedes Benz C43 AMG
lol uh oh. there gonna be upset you said this. pretty much though. Actually just bought these after trying the BMS:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
quality is insane for the price. Didn't want to justify $100 for new filters and wasn't going to run these unless they turned out looking impeccable on arrival.
debating additional mods to the factory boxes - but weary as replacement units are pricey.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
quality is insane for the price. Didn't want to justify $100 for new filters and wasn't going to run these unless they turned out looking impeccable on arrival.
debating additional mods to the factory boxes - but weary as replacement units are pricey.
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From: Massachusetts
2018 C43 AMG Brilliant Blue Metallic
i have K&N air filters. I did not buy any of the hot air intake systems. i use oem intakes with K&N filters.
the BMS and MSP or whatever the name of that other company intakes allow more flow it seems but if you sit, the hot air in engine bay kills it. so they may be ok if you are rolling and getting fresh air but not from a dig or waiting in line at the drag strip. id look into modifying the stock air intakes or fabbing my own with carbon fiber before buying those.
the BMS and MSP or whatever the name of that other company intakes allow more flow it seems but if you sit, the hot air in engine bay kills it. so they may be ok if you are rolling and getting fresh air but not from a dig or waiting in line at the drag strip. id look into modifying the stock air intakes or fabbing my own with carbon fiber before buying those.
I did not check iats stock cause I didn't have jb4 with the car stock.
Junior Member
Joined: Jan 2022
Posts: 24
Likes: 0
2017c43
no extra mods needed which make this car awesome. the tuning ceiling is relatively low though without major upgrades which makes this car awesome and not at the same time.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
i run jb4 map 5 daily with an e35-e40 mix. been about a year on this setup and loving it. 0-60 is consistent 3.55-3.6 and 12 flat quarter mile. dont run more than e40 though. the fuel pump maxes out in the upper gears and you run out of fuel. e50 is the hard limit, but performance on upper end is reduces somewhere between e40 and e50.
people that use map 6 and really get involved with a custom tune for their car are hitting 11.5-12.0. if you stack with a full ecu tune and jb4 we have been seing sub 11.5 second quarters. that seems to be the limit of stock turbos. the lower 11s guys i believe also have meth as well. depending how much you want to get involved will determine where you fall in the 11s quarter.
for me, just putting some new air filters in and the jb4 has satisfied my needs for this car. best bang for buck no questions asked. make sure to use green plug though! helps tremendously to reduce effects of ambient variables. keep those IATs low as well and this is a rocket ship off the line.
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Joined: Mar 2020
Posts: 199
Likes: 75
Acura TL-SH, among others
thanks for all the info !!! I was looking into getting a 2017 c43 as they are extremely affordable rn, and it seems like there isn’t too much info out their on the car. I heard water meth injection is a great combo with jb4. Could that be used to see a low 0-60 time to beat a model 3 performance off the line ??
