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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > RB Turbo / JB4 G5 review.



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      05-05-2012, 08:07 PM   #1
themyst
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RB Turbo / JB4 G5 review.

Hey guys:

I think it's about time to post a review on these turbos now that I finally got them running the way I want.

Some cliff notes:

My friend and I completed the install DIY on his lift in 6 hours. Considering we've done turbos twice before, we got it down to a science. Subframe out in 45 minutes, DPs and FMIC out in one hour, plenty of cigarette breaks and a lunch break in between as well. You do NOT need to buy new oil lines, or many of the gaskets. The only gaskets that I would deem a must would be the six turbo to cylinder head gaskets. The rubber o-rings for the oil and coolant lines can be reused as long as they are not cracked or deformed in any way.

Driving impressions:

The sound of these turbos spooling is amazing. I initially thought they were a touch laggier than stock turbos, but the JB4 G5 lagfix resolved that issue. They actually sound like a real turbo unlike the stockers which are virtually silent. Putting around town with a little tweaking with the JB4 G5 board's lagfix setting made it a pleasure to drive. No issues there. I initially started with 16 psi peak which I immediately felt a huge difference. Unlike stock turbos which fall flat on their face north of 6000 RPM, these pull and continue pulling all the way to redline.

I recently tried 18 psi, which is the most I am comfortable running on a single CM10 meth nozzle + 93 octane pump. AFR appears to be within what I'd consider safe operating range based on the JB4 G5 calculation (13.5 on WOT onset dropping to low 12's) Let's just say, you have to experience it. That first time you cranked the boost on an FBO + meth car, well it's that experience all over again times two.

Once I get the dual meth nozzle adapter to run a CM7/CM10 combo, I will most definitely crank the boost up a little more to see where the car stands.

What many people do not appreciate is the powerband of these turbos. Yes, they may only make 480 whp (500+ possible though) but they sustain this power all the way up top making for a car that will pull harder than a car with similar peak power on a naturally aspirated linear powerband.

For the money, you simply cannot beat RB turbos for performance and value. Rob's customer service is great as well. I would put him on par with Terry@BMS which many people know is among the best in the business.

------------------------
JB4 G5

What this board brings to the table (over the standard JB4) that I am currently testing:

-Removed duty cycle restriction. Can run as much boost as you want that 100% WGDC can give you. Not necessarily a benefit for stock turbo folks, but for those of us with upgraded twins, much easier to hit target without any nanny intervention.
-Integrated CPS (Crank Position Sensor intercept). The idea is CPS will disable itself when running methanol but activate when meth is not flowing, ensuring smoother transitions. For those that are not familiar with the acronym, "CPS" will reduce timing via Crank Position Sensor to proactively reduce timing corrections.
-Larger fueling resistors. Will allow for greater fuel pressure output than what the existing JB4 brings to the table.

So far, the JB4 has been completely drama free and I am very happy with what this tune brings to the table.

--additional comments re: JB4 G5:

My #1 complaint running the original JB4 was part throttle response. The JB4 G5 has a wider adjustment range to dial in the throttle response to your liking. Lagfix = 80 was WAY too sensitive for me. A drop to 40 got it just right for my liking.
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Last edited by themyst; 05-07-2012 at 10:24 PM.
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      05-05-2012, 09:04 PM   #2
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Have you noticed any more oil consumption with these turbos?
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      05-05-2012, 09:07 PM   #3
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I'll answer as another RB owner, whose turbos were installed properly - no.

I have 3000 miles on them already, iDrive still shows oil level as full.
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      05-05-2012, 09:20 PM   #4
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Nice, other thing is, myst as an auto owner, so far how it holding up?
Any signs of the tranny going out?
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      05-05-2012, 09:23 PM   #5
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There are quite a few RB owners nowadays it seems.
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      05-05-2012, 09:36 PM   #6
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Yup. If I keep my car I'll be getting RBs in the spring.
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      05-05-2012, 09:46 PM   #7
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Nice review. Now, how much did you spend total on RB turbo and hardware replacement? RB turbo is my next move. Thanks!
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      05-05-2012, 11:03 PM   #8
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Quote:
Originally Posted by themyst View Post
-Integrated CPS (Crank Position Sensor intercept). The idea is CPS will disable itself when running methanol but activate when meth is not flowing, ensuring smoother transitions. For those that are not familiar with the acronym, "CPS" will reduce timing via Crank Position Sensor to proactively reduce timing corrections.
This interests me

Also curious how your AT is holding up.

Unfortunately, the rest doesn't apply to me at the moment, as i don't plan on doing a turbo upgrade until my stockers give out. Single turbo kits may be more affordable and less of a let down by then (hopefully!). If not, RBs still look like a better option than vishnu's single turbo offering.
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      05-06-2012, 12:01 AM   #9
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Enjoy them, they sure are fun. But why stop at just 2 meth nozzels?
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      05-06-2012, 12:32 AM   #10
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Any dynos or logs?

Are you staking the JB4 with the COBB or are you running JB4 by itself?

I would prefer this upgrade over a single since I like the power under 3500 rpm.
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      05-06-2012, 02:20 AM   #11
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Good stuff, I should be getting my RB's soon now and I will also be running them with JB4
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      05-06-2012, 05:58 AM   #12
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Nice review mate. Great to see you're enjoying the RBs. Mine run very well now too, no oil consumption at all.

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      05-06-2012, 08:25 AM   #13
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very nice. was hoping for your impressions on the rb's.

will you do any testing with the COBB alone or COBB/JB4 combo? would definitely want some feedback on that as well.
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      05-06-2012, 08:52 AM   #14
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Is the G5 the jb4 v2? Same black box?
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      05-06-2012, 11:11 AM   #15
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Good to hear you like them. Great upgrade, reasonable price, rob is great to deal with, and makes me feel like I have a brand new car even though it's 5 years old now.

I would recommend replacing the intake tube gaskets after seeing dzenno's turbo eat one that was degenerating. Cheap insurance.
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      05-06-2012, 11:58 AM   #16
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Quote:
Originally Posted by enrita View Post
Is the G5 the jb4 v2? Same black box?
They've been calling it the "Big Turbo" board but I think recently they started calling it the G5 board instead. The normal JB4 is the G4 board. Differences are mainly things needed for big turbo cars (twinsand single) like a wider fueling range, isolated boost control, built in CPS, built in SLD, built in 2step/NLS, etc. Some meth customers on OEM turbos are also testing it since it no longer has the hardware duty cycle safety limit and a growing number of them want to see how far they can push the stock turbos regardless of the risks.

Mike
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      05-06-2012, 12:08 PM   #17
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
Some meth customers on OEM turbos are also testing it since it no longer has the hardware duty cycle safety limit and a growing number of them want to see how far they can push the stock turbos regardless of the risks.

Mike
sounds like these stock turbo guys want an excuse to upgrade sooner than later
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      05-06-2012, 12:10 PM   #18
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
They've been calling it the "Big Turbo" board but I think recently they started calling it the G5 board instead. The normal JB4 is the G4 board. Differences are mainly things needed for big turbo cars (twinsand single) like a wider fueling range, isolated boost control, built in CPS, built in SLD, built in 2step/NLS, etc. Some meth customers on OEM turbos are also testing it since it no longer has the hardware duty cycle safety limit and a growing number of them want to see how far they can push the stock turbos regardless of the risks.

Mike
Great thanks Mike ! Looks promising. I tested it and its very smooth. Need to fix a boost leak before doing more tests.
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      05-06-2012, 12:21 PM   #19
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The JB4 G5 is a new JB4 or just the new interface and new firmware?
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      05-07-2012, 11:24 AM   #20
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Thanks for the kind words glad you're having fun!
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      05-07-2012, 11:28 AM   #21
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Quote:
Originally Posted by Mike@N54Tuning.com View Post
They've been calling it the "Big Turbo" board but I think recently they started calling it the G5 board instead. The normal JB4 is the G4 board. Differences are mainly things needed for big turbo cars (twinsand single) like a wider fueling range, isolated boost control, built in CPS, built in SLD, built in 2step/NLS, etc. Some meth customers on OEM turbos are also testing it since it no longer has the hardware duty cycle safety limit and a growing number of them want to see how far they can push the stock turbos regardless of the risks.

Mike
Edit: Removed my comment, as it's more directed at Terry@bms

Last edited by 2000max; 05-07-2012 at 12:25 PM.
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      05-07-2012, 12:18 PM   #22
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I thrashed this car pretty hard over the past few days and my oil indicator still shows full. I do not have an OCC.
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