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Cannot boost less than 25PSI first gear

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Old Sep 14, 2014 | 10:42 AM
  #1  
Steeve_Civic's Avatar
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From: FRANCE
Default Cannot boost less than 25PSI first gear

I have problem with traction because I cannot boost less than 25PSI in first gear.
When boost controller off spring w/g is 14psi no problem.
When AVC-R on, duty 60% start du -50 still running 25psi in first gear.
3rd and 4th gear running 32psi

Would like to run Tial spring pressure in first gear, what is the solution ?
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Old Sep 14, 2014 | 12:40 PM
  #2  
tepid1's Avatar
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Default Re: Cannot boost less than 25PSI first gear

It's in the setup of your boost controller. You need less duty cycle to start. It could also be things like the tune or manifold design, but that is less likely.
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Old Sep 14, 2014 | 03:36 PM
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Default Re: Cannot boost less than 25PSI first gear

Originally Posted by Steeve_Civic
I have problem with traction because I cannot boost less than 25PSI in first gear.
When boost controller off spring w/g is 14psi no problem.
When AVC-R on, duty 60% start du -50 still running 25psi in first gear.
3rd and 4th gear running 32psi

Would like to run Tial spring pressure in first gear, what is the solution ?

Is it a solid 25 or does it slowly build up to 25?
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Old Sep 15, 2014 | 06:30 AM
  #4  
extremeracer's Avatar
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From: Johannesburg, Gauteng, South Africa
Default Re: Cannot boost less than 25PSI first gear

Originally Posted by Steeve_Civic
I have problem with traction because I cannot boost less than 25PSI in first gear.
When boost controller off spring w/g is 14psi no problem.
When AVC-R on, duty 60% start du -50 still running 25psi in first gear.
3rd and 4th gear running 32psi

Would like to run Tial spring pressure in first gear, what is the solution ?
Make sure you're changing the right part of the AVC-R's settings. On the AVC-R you can set a flat duty cycle or you can set it by rpm (different duty cycles for different rpm points).

If using the by rpm method you also have to make sure your "n-points" match your engine and turbo's operating range. The n points can be configured in a dedicated setup screen.

Start off with a low duty cycle like 25% and check what boost you get
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Old Sep 15, 2014 | 12:54 PM
  #5  
Steeve_Civic's Avatar
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From: FRANCE
Default Re: Cannot boost less than 25PSI first gear

Originally Posted by $MIKE$
Is it a solid 25 or does it slowly build up to 25?
It is a spinning 25psi in first gear.
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Old Sep 15, 2014 | 12:55 PM
  #6  
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Default Re: Cannot boost less than 25PSI first gear

Running a flat duty cycle.
Yes rpm points match from 4000 rpm to 9500rpm
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Old Sep 15, 2014 | 02:36 PM
  #7  
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From: in the sticks
Default Re: Cannot boost less than 25PSI first gear

What manifold, wastegate size and ar? Will it hold 15 in 3rd and 4th?
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Old Sep 16, 2014 | 09:33 AM
  #8  
Steeve_Civic's Avatar
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From: FRANCE
Default Re: Cannot boost less than 25PSI first gear

Yes it hold 14psi in 3rd and 4th gear till 5000 to 9500 rpm.
Need to find out how to control my boost.
Running S300
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Old Oct 15, 2014 | 11:27 AM
  #9  
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From: FRANCE
Default Re: Cannot boost less than 25PSI first gear

Looking for a solenoid 3ports on/off by a 12v switch?
Which solenoid can do the job?
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Old Oct 15, 2014 | 08:43 PM
  #10  
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Default Re: Cannot boost less than 25PSI first gear

i am using the 4 port solenoid. wg spring is at 6 psi. At 54% dc, boost is at 36 psi.
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