2021 m5 jb4

boost4breakfast · 04-01-2021, 08:57 PM

installed the jb4 with all the connections. adding the jb4 gave me heated cup warmers lol. car pulls hard on map3 with snake oil. anyone else have heat soak issues? even the purel in my center console storage was warm lol

Quinn A · 04-02-2021, 01:16 PM

Quote:

Originally Posted by boost4breakfast

installed the jb4 with all the connections. adding the jb4 gave me heated cup warmers lol. car pulls hard on map3 with snake oil. anyone else have heat soak issues? even the purel in my center console storage was warm lol

Car runs super hot even without JB4.
Ive never had a car where the oil is 250F while cruising

boost4breakfast · 04-02-2021, 03:30 PM

topping off the coolant every 3k miles helps. heard that meth lowers IAT tremendously as well

Dethsupp0rt · 04-02-2021, 07:24 PM

Quote:

Originally Posted by Quinn A

Car runs super hot even without JB4.
Ive never had a car where the oil is 250F while cruising

You clearly never had a E90 335i then.

AngryInch · 08-15-2021, 12:05 AM

I installed the JB4 on a 21 Comp. I have the EWG installed and get a drivetrain malfunction under part load boost in map2 and right away in map 3. 94oct fuel with a can of boostane in it.

What is the stock boost of this 21 comp? I logged a 3rd gear pull, boost went up to 25, 26 and even 27. Timing seems to drop down quite a bit to around 5-7 degrees on ign1. Avg Ign is around 13 or so... Are we watching the cylinder ign or average??

AFR 14.2-14.7 under the pull. AFR hits 13 then leans out to mid 14s.

Seems like it was adding ~5psi of boost vs the ecu psi... IAT was 105-106f.

RS61 · 05-06-2023, 04:44 PM

How is everyone else with a 2021 jb4 setup currently doing? I've got a 2021 comp with a JB4 without the EWG connectors and haven't so far felt any difference. I haven't installed the EWGs because (1) it's harder to do yourself, (2) a few years ago that would lead to faults being thrown, and (3) a racechip supposedly works just fine with the standard two wires so logically a JB4 should too.

Has anyone done any dynos with this setup - 2021+ comp and jb4 to compare with stock? Or any other data to show how it runs (interested in both without ewg and with ewg as if that makes a difference I'll take it to the shop to get them plugged in)

04-01-2021, 08:57 PM	#23
boost4breakfast Enlisted Member 3 Rep 38 Posts Drives: 992 GT3 24 M4C 21 M5C (gone) Join Date: Jan 2021 Location: CLE iTrader: (0)	installed the jb4 with all the connections. adding the jb4 gave me heated cup warmers lol. car pulls hard on map3 with snake oil. anyone else have heat soak issues? even the purel in my center console storage was warm lol
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04-02-2021, 03:30 PM	#25
boost4breakfast Enlisted Member 3 Rep 38 Posts Drives: 992 GT3 24 M4C 21 M5C (gone) Join Date: Jan 2021 Location: CLE iTrader: (0)	topping off the coolant every 3k miles helps. heard that meth lowers IAT tremendously as well
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08-15-2021, 12:05 AM	#27
AngryInch Lieutenant 213 Rep 548 Posts Drives: 2021 BMW M5 Comp Join Date: Jul 2021 Location: Canada iTrader: (0)	I installed the JB4 on a 21 Comp. I have the EWG installed and get a drivetrain malfunction under part load boost in map2 and right away in map 3. 94oct fuel with a can of boostane in it. What is the stock boost of this 21 comp? I logged a 3rd gear pull, boost went up to 25, 26 and even 27. Timing seems to drop down quite a bit to around 5-7 degrees on ign1. Avg Ign is around 13 or so... Are we watching the cylinder ign or average?? AFR 14.2-14.7 under the pull. AFR hits 13 then leans out to mid 14s. Seems like it was adding ~5psi of boost vs the ecu psi... IAT was 105-106f.
	Appreciate 0 Quote

05-06-2023, 04:44 PM	#28
RS61 Private 80 Rep 84 Posts Drives: Audi RS6 Join Date: May 2018 Location: London iTrader: (0)	How is everyone else with a 2021 jb4 setup currently doing? I've got a 2021 comp with a JB4 without the EWG connectors and haven't so far felt any difference. I haven't installed the EWGs because (1) it's harder to do yourself, (2) a few years ago that would lead to faults being thrown, and (3) a racechip supposedly works just fine with the standard two wires so logically a JB4 should too. Has anyone done any dynos with this setup - 2021+ comp and jb4 to compare with stock? Or any other data to show how it runs (interested in both without ewg and with ewg as if that makes a difference I'll take it to the shop to get them plugged in)
	Appreciate 0 Quote