TPI Questions

[Clare Snyder]

>
>I was under the impression that EGR was to clean up emissions by 
>recirculating exhaust gas. I read that a performance mod was to 
>disable the EGR valve with big cams.
>
>gchan at compserv.senecac.on.ca
>> 

Big cams blead off effective compression at low speeds, where the ping is
usually the problem. A big cam can negate the requirement for EGR . Ping at
full throttle is not affected by EGR as it is shut down in that mode

My opinion, only, for what it is worth

>> 
>> I was hoping someone would jump in here.
>> 
>> Do you have any evidence of the engine knocking without EGR?
>> 
>> I have the same question - do I want it or not?  I'm also not concern with
>> economy, only power.
>> 
>> 
>> 
>> 
>> 
>> >I'm lost, for a performance engine, do you want egr or not ?  When I built
>> my tpi 350, I pulled the egr valve and stuck >a blanking plate over the
>> hole instead, oh, I also put the little metal plates in the manifold
>> gaskets where the egr is >meant to breathe through.  Was this a mistake (I
>> don't care about economy, only power)?>>
>> >
>> >
>> >Dan     dzorde at geocities.com
>> >
>> >
>> >The EGR valve is still present and connected, but doesn't actually do
>> >anything since there isn't a supply of exhaust gas to the valve.
>> >
>> >Grounding the EGR feedback wire will set off the SES light (it simulates
>> >the EGR being stuck in the open position)
>> >
>> >Leaving it disconnected will also occasionally set off the SES light
>> (there >are a few cases where the ECM will command the EGR to actuate, then
>> look to >see what happened.)  Fortunately, temps down here are high enough
>> that this >doesn't happen often.  (been about 4 months since the last time
>> the code >went off) It will also clear itself within a few minutes of
>> driving.
>> >
>> >Someday I'll have an EGR flange welded to one of the exhaust headers to
>> >supply external EGR.. but it's a low priority.
>> 
>> 
>> 
>> 
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