[Supras] VSV2 purpose

[berniek at technicaldevelop.com]

Robert:

    Thanks for the backup information.  I can understand getting rid of 
the VSV by some for the sake of simplicity with an upgraded FPR, but I'm 
far enough along enough with getting the new engine together that VSV2 
is already installed, moved to the top of the intake manifold along with 
the one for EGR.

    Incidentally, it was not hard to make a variable FPR from the stock 
one, the advantage being that it will fit in the stock location and look 
almost like the stock one.  There are examples of this in various 
internet articles.  You do need a small machine shop for this, primarily 
a lathe, but the cost requirements are not excessive over one's life as 
a car or other technical enthusiast.

    It should be easy enough to see if the VSV is operational by pulling 
the vacuum line off the diaphragm housing.  Nonetheless, you do have a 
point in KISS (keep it simple and stupid, although "stupid" does not 
really apply here").

    Thanks.

    Bernie

Robert Pina wrote:
> Marty is right, the front VSV is for hot start.
>
> I bypassed mine once to see how it would effect things.  It took about 
> an extra 1 second to start under heat soaked engine conditions.  Not a 
> huge deal, but somewhat annoying.
>
> Most people tend to lose the VSV when going to an upgraded FPR.  
> However, I have seen a couple of people retain the VSV with an FPR 
> swap out.
>
> For power concerns, I would not want the VSV in the way.  I would want 
> the FPR to see all of the boost.  You never know if the VSV could be 
> clogged, robbing you of the extra fuel pressure.
>
> Robert
>
> ----- Original Message ----- From: <berniek at technicaldevelop.com>
> To: "Supras Ireland Admin" <admin at supras-ireland.net>
> Cc: <Supras at supras.com>
> Sent: Wednesday, September 05, 2007 7:30 PM
> Subject: Re: [Supras] VSV2 purpose
>
>
>> Marty:
>>
>>    Somehow you always come through with answers that make sense.
>> Thanks.  I'm relocating both of the solenoid valves (this one and the
>> one for EGR which you may be fortunate to not have to the top of the
>> intake manifold for ease in future servicing. Its hard enough to get to
>> the bundle of steel and rubber tubing under where the top and bottom
>> intake manifolds join.
>>
>>    Take care.
>>
>>       Bernie
>>
>> Supras Ireland Admin wrote:
>>> Bernie, I believe the VSV in question is also to Aid hot Starting. 
>>> When the
>>> engine is hot, the VSV will stop
>>>  vacuum being applied to the FPR keeping it at base pressure - 
>>> during hot
>>> starts the 7m can suffer from fuel evap causing difficult starts, 
>>> the VSV
>>> insures a higher fuel pressure at rail during these conditions.
>>>
>>> Marty
>>> SSi
>>>
>>> -------------------------------------------------------------
>>> ----- Original Message -----
>>> From: <berniek at technicaldevelop.com>
>>> To: <Supras at supras.com>
>>> Sent: Monday, September 03, 2007 10:11 PM
>>> Subject: [Supras] VSV2 purpose
>>>
>>>
>>>
>>>> Solenoid valve VSV2 Front, under intake manifold on turbo version
>>>> appears to interrupt the manifold pressure signal to the fuel pressure
>>>> regulator and vent the FPR diaphragm to atmosphere?  .  Presumably 
>>>> this
>>>> is to richen the mixture since the engine is started with the throttle
>>>> closed.  But if so, why also have the cold start injector?
>>>>
>>>> When upgrading to a Walbro pump and 550cc injectors, has anyone had
>>>> experience in removing the solenoid valve?
>>>>
>>>> Thanks.
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> Supras mailing list
>>>> Supras at supras.com
>>>> http://supras.com/mailman/listinfo/supras_supras.com
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>> _______________________________________________
>> Supras mailing list
>> Supras at supras.com
>> http://supras.com/mailman/listinfo/supras_supras.com 
>
>
>
>