None standard blow off valve danger.

[Chris Wilson]

On Thu, 27 Apr 2000 10:26:17 -0400
Mike Pitts <mpitts at netspeak.com> wrote:

mpitts> Chris,
mpitts> 
mpitts> I just turbocharged a non-turbo car.  In the process, 
mpitts> I added a blowoff valve.  Initially I had it venting 
mpitts> to atmosphere. The ECU is hotwire MAF based and this 
mpitts> caused some problems with stalling on decel, and overly 
mpitts> lean on initial accel since the BOV would open slightly 
mpitts> and allow unmetered air to enter.  Plumbing the BOV 
mpitts> outlet between the MAF and turbo inlet solved the 
mpitts> problems completely.  It's a joy to drive again. 
mpitts> 
mpitts> I will always plumb BOV's into the intake from now on. 
mpitts> Just makes good sense.
mpitts> 
mpitts> <<An oscilloscope on the O2 sensors confirmed what was happening.>>
mpitts> 
mpitts> Hmmm, since you already have a setup using a 'scope to 
mpitts> read your O2 sensors, would you mind posting the waveform 
mpitts> difference between the pre-cat O2 and post-cat O2 sensors? 


I admit I had a friend do this, I am an ignoramous when it comes to
`scopes. He read the pattern, i was trying to do it with a digital
voltmeter and struggling. As he was moaning about doing this in the
first place (he isn't a car nut), I may not be able to do this, and i
wouldn't have a clue how to get the scope pattern from the scope to
e-mail... :-) I don't believe the Skyline has post cat O2 senors, and
mine hasn't got a cat at all.. It has two O2 sensors just after the
turbos, and we read those.


              Best Regards,
                      Chris Wilson
           http://www.formula3.demon.co.uk
(Race car and engine preparation and development)
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