[Supras] VSV2 purpose

[Robert Pina]

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.
>>>
>>>
>>>
>>>
>>> _______________________________________________
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>>>
>>>
>>
>>
>>
>>
>>
>
>
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