2350 cold weather MCF table adjustment
01-05-2022, (Subject: 2350 cold weather MCF table adjustment ) 
Post: #1
2350 cold weather MCF table adjustment
My 2350 has been demandated by a reputable member on this forum. Alberta has been in a deep freeze lately -30 to -40 and I am constantly on the boost gauge trying to keep boost down under 30-33 psi due to the dense air. I have been doing some research on here trying to get a little more information on adjusting the MCF tables between 1500-1700rpm to limit the boost pressure possibly making a separate tune all together to load during the cold months.

I’m having to run a gear or two lower to keep boost in safe range and i cant run this thing at 60mph loaded (super bs) like this . It’s probably ok if I am in the driver seat but I will at some point have to let another guy drive my truck and they do not understand the damage they can do.

Any advice to adjusting these values? I have all the technology to perform these changes but I have personally not made adjustments to an individual tune.


User's Signature: 2015 389 Peterbilt. ISX 550 18speed 3.70 gears
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01-05-2022, (Subject: 2350 cold weather MCF table adjustment ) 
Post: #2
RE: 2350 cold weather MCF table adjustment
First of all, are you sure that the engine is still using the mass flow references for its turbo positioning control?.

It is more likely that the turbo is being directly controlled via positioning tables instead .. after the de-mandate. If that is the case then simply lower the positions in the 'tahr_vgt_llim' table a bit where you think it needs adjusting, and that is all that has to be done.

Forum member 'running rough' lives and owns equipment up in those climates as well. Maybe he can chime in with his opinions on all the extreme cold weather.


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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 Thanks given by: SemiSweet
01-06-2022, (Subject: 2350 cold weather MCF table adjustment ) 
Post: #3
RE: 2350 cold weather MCF table adjustment
Thanks , From what I understand MM tunes do not employ the mass flow method, if they did it would compensate for the dense air correct?
I will do some tinkering with this Vgt table and follow up.


User's Signature: 2015 389 Peterbilt. ISX 550 18speed 3.70 gears
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01-06-2022, (Subject: 2350 cold weather MCF table adjustment ) 
Post: #4
RE: 2350 cold weather MCF table adjustment
(01-06-2022 )SemiSweet Wrote:  Thanks , From what I understand MM tunes do not employ the mass flow method, if they did it would compensate for the dense air correct?
I will do some tinkering with this Vgt table and follow up.

I have seen a few people try to control boost via the the 'MCF' methods. there is nothing wrong with doing it that way as long as it was done correctly. That is in fact the only method available in the CM870 programming. - It is far more touchy, sensitive, and unpredictable, but it is certainly doable. There will be a bit more turbo lag and unpredictable turbo positions by doing it that way, but it does somewhat work. - Either method that is used, requires a lot of tweaking to get it right.


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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