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Old 01-26-2012, 01:09 AM   #1
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Default tune boost without tps

I have a 1992, no tps. According to my datalogs, TP always reads 49. How do I control how much boost I get and make sure not to get too much? I'd like to stay under 10psi. See attachments.

I'm guessing I just use one row on the boost duty table? If so, how should the values and rpms read?
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tune boost without tps-boost_control.png   tune boost without tps-boost_target.png   tune boost without tps-boost_duty.png  
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Old 01-26-2012, 02:29 AM   #2
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Douche.

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Old 01-26-2012, 06:58 AM   #3
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Wth
I have searched this and other sites numerous times for this info and did not see it discussed.
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Old 01-26-2012, 09:39 AM   #4
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Quote:
Originally Posted by travisb View Post
I have a 1992, no tps. According to my datalogs, TP always reads 49. How do I control how much boost I get and make sure not to get too much? I'd like to stay under 10psi. See attachments.

I'm guessing I just use one row on the boost duty table? If so, how should the values and rpms read?
You would need to set up the boost duty table so you have the same value across each column from 100% to 0% TPS, whereas the values will be different with each RPM. Set the duty cycle to whatever keeps it under 10 psi.
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Old 01-26-2012, 10:02 AM   #5
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Thanks. Do I need to adjust the tables for VE, spark, etc. to max out at 175 kpa? I think they are at 218 or so right now.
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Old 01-26-2012, 10:04 AM   #6
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Also, since it is rpm based, how should out spread out the range?
And I'm guessing I should start with low boost at low rpm and gradually increase it the higher the rpm gets.
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Old 01-26-2012, 10:07 AM   #7
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Open each table, Click on the header row value and change the value
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Old 01-26-2012, 10:11 AM   #8
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Thanks Jeremy. I've got that. I was asking if I'm not planning on more than 10psi, would it be better to have 175kpa be my top value instead of 218. And then I would make adjustments appropriately the rest of the way down the table.
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Old 01-26-2012, 10:27 AM   #9
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Sorry, I misread the question.

That would allow you finer control over the range you're actually using.
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Old 01-26-2012, 10:59 AM   #10
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And back to boost duty, I could do something like the attached image, right? I have not tried it yet, but just asking for confirmation.
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Old 01-26-2012, 03:25 PM   #11
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Quote:
Originally Posted by travisb View Post
I was asking if I'm not planning on more than 10psi, would it be better to have 175kpa be my top value instead of 218.
It's not necessary to do so. In theory, you could gain one extra row of resolution, but it's not a bad idea to have some headroom in the map. I'd simply set the 218 row super-rich as a contingency to deal with boost overshoot and then leave it alone.
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