DIY WB update NOW Turbos

[Bruce]

Depends on application.
WOT Drag racing, kinda hard to be too big.
Closed course road racing, where you need lots of throttle response, can be
a problem.
Bonneville, never heard of too much I/C.

I would imagine that you could get into sag, problems.  As opposed to lag.
Lag being the delay in the turbo spooling up.  Sag, being from intake tract
ducting.  having an extremely large volume of air to change speed, could
lead to some problems in response.

Turbos are just such different animals.  So much is just about exhaust heat.

Small turbo, large I/C, gets things spooling good, and great IATs.  But
gonna be limited in ultimate flow.  Large Turbo, smaller I/C gets sluggish
from having to spin the turbo up, but better top end.  All about trade offs.
Which do you want/need.

Or maybe all things in moderation.  Then use Water Injection.
Bruce



From: <sapearso at rockwellcollins.com>
Subject: Re: DIY WB update NOW Turbos
> Is there a problem with an intercooler being too big? As in loss of boost
> pressure and such?
> Scott

> Date: Mon, 13 Aug 2001 20:43:37 -0700
> From: bearbvd at cmn.net (Greg Hermann)
> Subject: Re: DIY WB update
> >OK great, I wanted to ask about this. I'm just beginning to study boost
> >as a possible addition to our project engine. First, other than the Bell
> >and McInnis (sp?) books, can you recommend anything? Neither of those
> >books go much into intercooling, although the McInnis book has a just
> >fantastic section on computing parameters for the turbo itself, from the
> >turbo maps. I'm looking for something along the same lines in technical
> >detail, but on intercoolers. Any suggestions?
> >
> McInnes does talk about intercoolers in some detail. The trick is to
figure
> out the mass flow of air through the engine _AT_ the inlet manifold
> conditions which exist after the intercooler--and then work backwards to
> size the IC based on this mass flow and the given compressor inlet
> conditions.
>
> Greg

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