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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications Nominal Boost Pressure // BMS Flex Fuel Kit

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      01-05-2022, 09:28 PM   #1
rostrata
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Nominal Boost Pressure // BMS Flex Fuel Kit

As the title states, does anyone have that info on hand for the B58? Yes, I’ve searched many threads and continue to find contradictory answers. In short, I can’t trust what I’ve been seeing. Does anyone have an actual, verifiable, published, no-bs reference? It would be much appreciated.

Secondly, does anyone have any experience with the BMS Flex-Fuel Bluetooth octane indicator kit? I read all the info on the site. Looks like a solid option if one plans to run E30 or better. Would be nice to know how well it integrates with a JB4, or just as a standalone unit for purpose of information gathering. Thanks again.
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      01-06-2022, 08:59 AM   #2
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You probably won't find the answer to that here. More likely on the supra forums as there are a lot more tuned people on there and it's the same engine.
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      01-06-2022, 01:00 PM   #3
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Thanks for the recommendation. Maybe I should've bought a damn Supra GR. Damn thing was sitting there when I opted for the Bimmer. Go figure.
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      01-06-2022, 11:04 PM   #4
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I can try to help with your boost pressure. But I don't understand your exact question.
Are you asking what the stock max PSI is?
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      01-07-2022, 09:34 AM   #5
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Quote:
Originally Posted by suby01 View Post
I can try to help with your boost pressure. But I don't understand your exact question.
Are you asking what the stock max PSI is?
Yes. Exactly that. If I were to read a log file via OBD port, what is the max boost pressure I should expect to see from a stock tune?
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      01-07-2022, 12:07 PM   #6
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Quote:
Originally Posted by rostrata View Post
Yes. Exactly that. If I were to read a log file via OBD port, what is the max boost pressure I should expect to see from a stock tune?
I didn't realize that is what you were asking. You can actually see it on your sport display screen. It goes to 20 PSI. But I have only seen it reach 15-16 PSI.
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      01-07-2022, 02:42 PM   #7
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I believe stock psi is around 15 psi. I've seen it mentioned before but this is the only place I could find for reference.

https://kaganadertuning.com/collecti...b58-tuning-kit

Nick - How in the world did you hit 18-19 psi stock lol? My JB+ allows me to see that level of boost but previously I never saw above 15-16.
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      01-07-2022, 02:53 PM   #8
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Quote:
Originally Posted by jpowers36 View Post
I believe stock psi is around 15 psi. I've seen it mentioned before but this is the only place I could find for reference.

https://kaganadertuning.com/collecti...b58-tuning-kit

Nick - How in the world did you hit 18-19 psi stock lol? My JB+ allows me to see that level of boost but previously I never saw above 15-16.
Maybe it is 15. That bar is hard to read at WOT haha. It looks like it goes slightly past the 15 for me.
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      01-07-2022, 03:26 PM   #9
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Haha yeah it is hard to keep an eye on it.

Yeah that's what I would typically see stock.
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Last edited by jpowers36; 01-07-2022 at 08:32 PM..
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      01-07-2022, 08:31 PM   #10
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Using OBD reader it shows show max boost at 15 PSI on a stock tune. It does not always reach it even at WOT.
Im sad when its winter I no longer enjoy 24PSI. 😆
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      01-08-2022, 05:34 PM   #11
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Thanks for the responses. I figured it was around 15 nominal. Yeah I see the bar but I don't trust those readouts and they're, like another person said, difficult to read when driving. lol.

Again, appreciate the feedback.
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