Subaru top-mounted air-to-air intercoolers are peculiar in that
everything is happening back by the firewall and plumbing lengths are
very short.. The outlet is huge, as it mates directly to the throttle
body. Most fwd and awd cars have transverse mounted engines with the
exhaust facing forward, so they just mount the intercooler in front of
the radiator and run a tube over the rocker arm cover to a forward
facing throttle body. This arrangement provides for great flow of cold
air, but the plumbing is quite long. Every millimeter of intercooler
plumbing adds to turbo lag. Subaru top-mounted systems have really
short plumbing, but the intercooler sits in a spot that's way too hot.
Thst's why my old WRX (the angled one) is fitted to a bigger
hand-sculpted hood scoop and ducted to cram air through it. My turbo
and downpipe are also wrapped with header tape, to minimize the heating
of the intercooler.
Even with all my attempts at reducing heat in this area, it just so
happens that I have a perforated aluminum can (big pencil holder)
mounted adjacent to my turbocharger so that I can cook food (in Adams
peanut butter jars) while driving down the road. I would gladly give up
cooking ability for less under-hood heat, but it is there, so I use it.
I mostly just heat up microwave pizza pockets and sumilar "tubular
nutrition", but sometimes I cook more elaborate fare, of the crock-pot
or saute' variety. There is a book on this subject by the title of
"Manifold Destiny".
Oops, I digressed. Really hot pure racing Subarus (World Rally
Championship, Prodrive etc.) have modified intake manifolds with the
stock intake blanked off and a new opening for the trottle body facing
forward. This allows for shorter plumbing to a front-mounted
intercooler.
Although I suppose that my 92 sedan could be considered "hot" by some
folks, I never forget for even one second that my car does its business
on the streets, highways, church lawns, speed bumps etc., not on a race
track. I like power on tap at all points on the rpm band and I am not
willing to tolerate much increased lag in order to get more top-end
power. I firmly believe that the magic of a Subaru's performance is
that it is "best-all-around". Anything that sacrafices its overall
practicality for a limited area of performance (especially drag racing)
is bad form and a clear indication that the perpetrator should be
driving soe other brand of car.
Bon Appetite'
Bill Robinson
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Intercooling
Moderators: Helpinators, Moderators
-
Bill C.
Intercooling
Right on.
----- Original Message -----
From: William D. Robinson <vultureboy@mindspring.com>
To: <bc-bflegacyworks@egroups.com>
Sent: Saturday, November 25, 2000 2:58 PM
Subject: [BC-BFLegacyWorks] Intercooling
> Subaru top-mounted air-to-air intercoolers are peculiar in that
> everything is happening back by the firewall and plumbing lengths are
> very short.. The outlet is huge, as it mates directly to the throttle
> body. Most fwd and awd cars have transverse mounted engines with the
> exhaust facing forward, so they just mount the intercooler in front of
> the radiator and run a tube over the rocker arm cover to a forward
> facing throttle body. This arrangement provides for great flow of cold
> air, but the plumbing is quite long. Every millimeter of intercooler
> plumbing adds to turbo lag. Subaru top-mounted systems have really
> short plumbing, but the intercooler sits in a spot that's way too hot.
> Thst's why my old WRX (the angled one) is fitted to a bigger
> hand-sculpted hood scoop and ducted to cram air through it. My turbo
> and downpipe are also wrapped with header tape, to minimize the heating
> of the intercooler.
>
> Even with all my attempts at reducing heat in this area, it just so
> happens that I have a perforated aluminum can (big pencil holder)
> mounted adjacent to my turbocharger so that I can cook food (in Adams
> peanut butter jars) while driving down the road. I would gladly give up
> cooking ability for less under-hood heat, but it is there, so I use it.
> I mostly just heat up microwave pizza pockets and sumilar "tubular
> nutrition", but sometimes I cook more elaborate fare, of the crock-pot
> or saute' variety. There is a book on this subject by the title of
> "Manifold Destiny".
>
> Oops, I digressed. Really hot pure racing Subarus (World Rally
> Championship, Prodrive etc.) have modified intake manifolds with the
> stock intake blanked off and a new opening for the trottle body facing
> forward. This allows for shorter plumbing to a front-mounted
> intercooler.
>
> Although I suppose that my 92 sedan could be considered "hot" by some
> folks, I never forget for even one second that my car does its business
> on the streets, highways, church lawns, speed bumps etc., not on a race
> track. I like power on tap at all points on the rpm band and I am not
> willing to tolerate much increased lag in order to get more top-end
> power. I firmly believe that the magic of a Subaru's performance is
> that it is "best-all-around". Anything that sacrafices its overall
> practicality for a limited area of performance (especially drag racing)
> is bad form and a clear indication that the perpetrator should be
> driving soe other brand of car.
>
> Bon Appetite'
> Bill Robinson
>
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
>
>
-------------------------- eGroups Sponsor -------------------------~-~>
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---------------------------------------------------------------------_->
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----- Original Message -----
From: William D. Robinson <vultureboy@mindspring.com>
To: <bc-bflegacyworks@egroups.com>
Sent: Saturday, November 25, 2000 2:58 PM
Subject: [BC-BFLegacyWorks] Intercooling
> Subaru top-mounted air-to-air intercoolers are peculiar in that
> everything is happening back by the firewall and plumbing lengths are
> very short.. The outlet is huge, as it mates directly to the throttle
> body. Most fwd and awd cars have transverse mounted engines with the
> exhaust facing forward, so they just mount the intercooler in front of
> the radiator and run a tube over the rocker arm cover to a forward
> facing throttle body. This arrangement provides for great flow of cold
> air, but the plumbing is quite long. Every millimeter of intercooler
> plumbing adds to turbo lag. Subaru top-mounted systems have really
> short plumbing, but the intercooler sits in a spot that's way too hot.
> Thst's why my old WRX (the angled one) is fitted to a bigger
> hand-sculpted hood scoop and ducted to cram air through it. My turbo
> and downpipe are also wrapped with header tape, to minimize the heating
> of the intercooler.
>
> Even with all my attempts at reducing heat in this area, it just so
> happens that I have a perforated aluminum can (big pencil holder)
> mounted adjacent to my turbocharger so that I can cook food (in Adams
> peanut butter jars) while driving down the road. I would gladly give up
> cooking ability for less under-hood heat, but it is there, so I use it.
> I mostly just heat up microwave pizza pockets and sumilar "tubular
> nutrition", but sometimes I cook more elaborate fare, of the crock-pot
> or saute' variety. There is a book on this subject by the title of
> "Manifold Destiny".
>
> Oops, I digressed. Really hot pure racing Subarus (World Rally
> Championship, Prodrive etc.) have modified intake manifolds with the
> stock intake blanked off and a new opening for the trottle body facing
> forward. This allows for shorter plumbing to a front-mounted
> intercooler.
>
> Although I suppose that my 92 sedan could be considered "hot" by some
> folks, I never forget for even one second that my car does its business
> on the streets, highways, church lawns, speed bumps etc., not on a race
> track. I like power on tap at all points on the rpm band and I am not
> willing to tolerate much increased lag in order to get more top-end
> power. I firmly believe that the magic of a Subaru's performance is
> that it is "best-all-around". Anything that sacrafices its overall
> practicality for a limited area of performance (especially drag racing)
> is bad form and a clear indication that the perpetrator should be
> driving soe other brand of car.
>
> Bon Appetite'
> Bill Robinson
>
>
>
> To unsubscribe from this group, send an email to:
> BC-BFLegacyWorks-unsubscribe@egroups.com
>
>
>
>
-------------------------- eGroups Sponsor -------------------------~-~>
eLerts
It's Easy. It's Fun. Best of All, it's Free!
http://click.egroups.com/1/9699/1/_/_/_/975211562/
---------------------------------------------------------------------_->
To unsubscribe from this group, send an email to:
BC-BFLegacyWorks-unsubscribe@egroups.com