Wastegate mod.....
avos at cochlear.com.au
avos at cochlear.com.au
Mon Oct 13 01:51:42 GMT 1997
Simon,
Unfortunately its not (quite) a perfect world, and if you do not let
the pressure get to the wastegate a few psi before the set boost
level, you will find that boost may fluctuate (oscillate), and you
will get a lot of overshoot ( jumps to a few psi above the set level
initially before backing off), as the wastegate response is not that
quick. Your engine may be capable of handling this over-boost, and
overshoot in the boost feels good in a straight line, but it is not
that drivable through a corner, as it become difficult to balance the
car with the throttle.
Still I would be interested to find out what you find when you try it!
Regards,
Adrian
______________________________ Reply Separator _________________________________
Subject: Re: Wastegate mod.....
Author: diy_efi at coulomb.eng.ohio-state.edu at INTERNET
Date: 13/10/97 9:57
Hi Adrian and All the rest of the Petrolheads ;-)
> Sounds good. I am curious how much before full boost you would need to
> open the solenoid.
A good question ;-) I'll be giving trial and error a go !
> 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.
Could someone please enlighten me...... why would you want the waste gate to
crack before the boost set point ( just for the moment we are living in a
perfect world
where the waste gate stabilises the boost instantly ) wouldn't it be ideal (
quickest
spool up time ) if the tubo got all the exhaust gas untill it didn't need more?
Is the PID used as some form of traction control ie: it's programed so that the
power
going down doesn't make the wheels loose traction?
> The idea is similar to
> yours, but instead of using comparators (opamps) it uses a
> microcontroller to calculate the optimum duty cycle .....
Sounds cool ......I've been looking at doing a couse at the polytech on micros
as it
looks like most of the stuff I want to build would be easyer to do using micros.
> Please let me know how this system you have planned goes if
> you decide to do it.....
I'll keep you posted....
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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