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Default 09-19-2013, 01:48 AM

thanks so much - great write up. very very helpful!


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Default log - 09-23-2013, 07:05 PM

What may be the cause of my slow boost build up ???? Car is fbo with 50% meth on map 3 with 60 % additive running AT race flash(low load) the original version and E40 fuel mix...
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Last edited by Robert; 09-23-2013 at 07:31 PM..
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Cool 09-23-2013, 07:38 PM

Quote:
Originally Posted by Robert
What may be the cause of my slow boost build up ???? Car is fbo with 50% meth on map 3 with 60 % additive running AT race flash(low load) the original version...
Have you done Terry's solenoid test? Cheap and easy to do.

If that is not the problem perhaps the WG linkage needs to be adjusted. The rear turbo is easy.....the front is a pita I am told.

Since the car makes over 18 psi boost by forth gear I suspect a lot of the problem is just cold turbos.... but no leaks.

Expecting to get to 18 psi on tip in starting at 5000 rpm (in second gear) is not going to happed..... no temperature and no time to spool.
But boost in third is not too good either so I would start with Terry's test.

Try doing a log in 3rd gear from 2500 rpm and see how the boost builds up compared to some of my examples.


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Default 09-24-2013, 06:54 AM

Quote:
Originally Posted by az335iat
Have you done Terry's solenoid test? Cheap and easy to do.

If that is not the problem perhaps the WG linkage needs to be adjusted. The rear turbo is easy.....the front is a pita I am told.

Since the car makes over 18 psi boost by forth gear I suspect a lot of the problem is just cold turbos.... but no leaks.

Expecting to get to 18 psi on tip in starting at 5000 rpm (in second gear) is not going to happed..... no temperature and no time to spool.
But boost in third is not too good either so I would start with Terry's test.

Try doing a log in 3rd gear from 2500 rpm and see how the boost builds up compared to some of my examples.
Thanks. Will do. I also did the RB pcv valve replacment. Will see if it helps any.


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Default 09-26-2013, 06:46 AM

Fantastic thread. Thank you for that AZ. Just wondering if the function of the PID adjustment, does it actually increase boost?


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Default 09-26-2013, 07:19 AM

Uploaded the new 26.6 and installed the RB pvc valve also turned up the number 10 adj to 100% and the turbos spool up instantly past 12psi. Also switching to map 7 has helped with boost responce.


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Cool 09-26-2013, 08:41 AM

Quote:
Originally Posted by DinoNac
Fantastic thread. Thank you for that AZ. Just wondering if the function of the PID adjustment, does it actually increase boost?
No...the boost setpoint has nothing to due with the PID gain. The gain adjustment should not be adjusted unless
you are instructed to by Terry for testing purposes.
Raising the gain can cause boost instability while lowering it can cause poor boost response.


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Default 09-26-2013, 10:56 AM

Quote:
Originally Posted by az335iat
No...the boost setpoint has nothing to due with the PID gain. The gain adjustment should not be adjusted unless
you are instructed to by Terry for testing purposes.
Raising the gain can cause boost instability while lowering it can cause poor boost response.
Ok Thank you, terry did actually tell me to raise it and I just wanted to know why and what the higher number actually does. I was also curious if 12 is good would say.... 14 be better?


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Default 09-26-2013, 11:06 AM

I did notice an improvement in peak boost and the overall boost curve once Terry told me to raise it and with this thread being about the jb4 parameters and what their meanings are, I had hoped to get a better understanding of exactly what the boost setpoint is and how it relates to the overall boost curve. I also was curious if it was something that could be experimented with incrementally, in an attempt to fine tune the jb4?


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Cool 09-26-2013, 09:29 PM

Quote:
Originally Posted by DinoNac
Ok Thank you, terry did actually tell me to raise it and I just wanted to know why and what the higher number actually does. I was also curious if 12 is good would say.... 14 be better?
No.


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Default 10-07-2013, 02:13 PM

I have a question about the "ECU PSI". When looking at my logs, that column shows 20-25psi when I get on the throttle hard and the pre-boost reads the normal 8-18.5psi that the JB4 is supposed to create. It seems that the ECU PSI number should be lower than the actual amount of boost if the JB4 is tricking the DME into thinking that boost is within stock parameters. I would really hate to have to warranty something and they read the max boost value off the DME and it says 24.5PSI. Am I reading this incorrectly. This is on an F30 N55.


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Cool 10-07-2013, 06:19 PM

That is just an error in how the data gets displayed.

I believe Terry will fix it in a later interface version.


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Default 10-09-2013, 03:58 PM

hi guys I'm from Argentina and the language is very difficult for me to understand many things I need to fully understand the operation of the fsb I need to turn on the pump at 4 psi of pressure loaded and it's working 100% on 12 psi as possible to achieve??? "meth boost additive" that I put value or function meets, and in "meth flow scaling". this question is because I did a record and see that only meth gives me values ​​like "15" I could explain this because I read a lot of times and I can not understand
I I have fsp with jb4 and aem meth pump and 550cc injector aem
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Cool 10-09-2013, 08:18 PM

Quote:
Originally Posted by laurean bmw 135i n54
hi guys I'm from Argentina and the language is very difficult for me to understand many things I need to fully understand the operation of the fsb I need to turn on the pump at 4 psi of pressure loaded and it's working 100% on 12 psi as possible to achieve??? "meth boost additive" that I put value or function meets, and in "meth flow scaling". this question is because I did a record and see that only meth gives me values ​​like "15" I could explain this because I read a lot of times and I can not understand
I I have fsp with jb4 and aem meth pump and 550cc injector aem
The JB4 and FSB work together to turn on the meth pump (JB4) and monitor the pump motor current to infer pump flow (FSB).

The pump output is not modulated...... but runs at 100% when it is running.

The turn on condition is not user adjustable.

The motor current signal monitored by the FSB is sent to the JB4.
The JB4 interprets the current signal, and if the value of the current is in the expected normal range....
not too high or not too low, then a 100% meth flow signal is calculated.

On map 3, the "Meth Boost Additive" is added to a base boost curve (Map 1 curve) in relation to the amount of the calculated meth flow signal.

For example:
If the "Meth Boost Additive" is 40 (4.0) psi and the meth flow signal is equal to or greater than the "Meth Flow Scaling" number
then the boost setpoint is raised by 4 psi above the base map setpoint.

If the "Meth Boost Additive" is 40 (4.0) psi and the meth flow signal is only 50% of the "Meth Flow Scaling" number
then the boost setpoint is raised by 4 * 50% or 2 psi above the base map setpoint.

For correct operation the Meth Flow Scaling number should be set to 60 with a CM pump. I am not sure what
the correct value should be for the AEM pump and 500 cc/min nozzle.


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Default 10-09-2013, 08:43 PM

ok I have understood I am not very clear but the option probrare 7/5 when the pump runs at 100% that you should see on the clock to the maximum? and recording data that should see value? When the pump runs at 100%

"Meth Boost Additive" = 40 (4psi) pump 0% working
"Scaling Meth Flow" = 50??? 100% working pump
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Cool 10-10-2013, 09:27 AM

Quote:
Originally Posted by laurean bmw 135i n54
ok I have understood I am not very clear but the option probrare 7/5 when the pump runs at 100% that you should see on the clock to the maximum? and recording data that should see value? When the pump runs at 100%

"Meth Boost Additive" = 40 (4psi) pump 0% working
"Scaling Meth Flow" = 50??? 100% working pump
When testing the pump with option 7/5 you should see the the flow indication in the dash go to maximum.

Not sure what your other questions are??

Can you do some logs in map 3 and post here?


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Default 10-10-2013, 05:03 PM

ok today night we do a couple of tests and I will upload the data today I did the test program put on 7/5 and press on the accelerator and the pump is working properly, I must check the temperature gauge depth scale??? today I will try with this meth boost additive value 40, and scaling meth flow 70
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Cool 10-10-2013, 08:03 PM

Temperature gauge will read meth flow when 7-5 is set and pedal is at maximum.
Note: Flow indication does not go back to zero when you release the pedal.
It will go back to zero when you start the car.


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Default 10-11-2013, 02:58 AM

So when trying to monitor fuel pumps, both HPFP and LPFP, what should we be seeing?
What values to look out for?


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Cool 10-11-2013, 07:52 AM

Quote:
Originally Posted by bmsportzn135i
So when trying to monitor fuel pumps, both HPFP and LPFP, what should we be seeing?
What values to look out for?
The nornal values are listed in my first post in this section under FP L & FP H.


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Default 10-14-2013, 01:00 PM

Nice work az. Much appreciated!
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Default 10-14-2013, 02:32 PM

Thanks for the post. After reviewing my logs vs the parameters listed and finding no issues. ( map 5, e45 mix) what can be adjusted for greater gains?

What would a backend flash add?
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Cool 10-14-2013, 07:35 PM

Quote:
Originally Posted by 135iam
Thanks for the post. After reviewing my logs vs the parameters listed and finding no issues. ( map 5, e45 mix) what can be adjusted for greater gains?

What would a backend flash add?
Ability to run higher E85 mixes....if your fuel pumps are up to the task.
Higher AFR ratios which help the fuel pump problem.
For auto transmission cars higher load targets with quicker shifts and better timing post upshift when short shifting.


You could run a custom map 6 or just run map 7 and see how it looks.
Your not going to be leaving a lot on the table with a maxed out map 5.


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Default 10-14-2013, 08:02 PM

Quote:
Originally Posted by az335iat
Ability to run higher E85 mixes....if your fuel pumps are up to the task.
Higher AFR ratios which help the fuel pump problem.
For auto transmission cars higher load targets with quicker shifts and better timing post upshift when short shifting.


You could run a custom map 6 or just run map 7 and see how it looks.
Your not going to be leaving a lot on the table with a maxed out map 5.
Is there a thread that explains how to setup a custom map 6?


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Cool 10-15-2013, 08:26 AM

How to build the table or how to come up with the table values?

I assume the latter..... No.
If you do not have an idea of what boost curve you want to run then it is best not to be building your on boost curves.

If you do know what curve you want to run then just load those values into the table at the indicated RPM points and the JB4 builds the curve.
Note: If spraying, the meth adder value will be added to the Map 6 base curve.

I thought you said you were happy with your car and were going to quit playing with it.

JM $0.02 but if you keep on your present course your journey will not end well.


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