Wastegate mod.....

[avos at cochlear.com.au]

     Sounds good. I am curious how much before full boost you would need to 
     open the solenoid. Personally, I am building a boost controller that 
     implements a PID algorithm to allow the control parameters to be 
     optimised for a particular turbo response. The idea is similar to 
     yours, but instead of using comparators (opamps) it uses a 
     microcontroller to calculate the optimum duty cycle to send to the 
     solenoid. Please let me know how this system you have planned goes if 
     you decide to do it.....
     
     Adrian Vos
     avos at cochlear.com.au
     


______________________________ Reply Separator _________________________________
Subject: Wastegate mod.....
Author:  diy_efi at coulomb.eng.ohio-state.edu at INTERNET
Date:    09/10/97 9:43


Hi All
     
I had a thought last night while reading about wastegates... 
Since they start to open at anywhere from 30% - 50 % of the boost 
regulation point (ie: max boost ) they waste some energy/exhaust 
gas that could be used to spool the turbo up quicker.
If you used a map sensor and maybe 2 op-amps you could make a 
board that controlled a boost solinoid so that when 1 psi was reached it 
opened fully and stayed open untill 1 - 2 psi before max boost, then it 
would shut and let the pressure activated diaphram take over. this would 
mean the the turbo would get ALL of the exhaust gas untill it didn't 
need any more.  
This wont make much difference in 1st or 2nd but in the last 3 gears 
it should help a lot. This idea is nothing new, this is what all those 
expensive boost controllers do......... but as I don't want "in car 
adjustible boost" flashy leds blah blah all I want is the performance 
and NOT the price.
     
I was thinking that this will be easy to build ......any comments
     
Cheers
     
Simon
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  Simon Quested (E-mail questeds at lincoln.ac.nz)
  Computer Technician, Silicon Graphics & Windows NT Support 
  Centre for Computing and Biometrics
  LINCOLN UNIVERSITY OF NEW ZEALAND
  Phone (64)(03) 3252811 Ext. 8087
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http://www.lincoln.ac.nz/ccb/techs/simon/default.htm 
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Albert Einstein: "Only two things are infinite, the universe and
human stupidity, and I'm not sure about the former." 
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