[Diy_efi] Throttle body sizing

[William Shurvinton]

There isn't a simple answer to this one, as you have to treat the throttle
as part of a tuned system in NA systems ( and turbos off boost). As you
enlarge the throttle (NA) you will change the resonant frequency of the
inlet, perhaps for better, usually for worse. Once you get too big you will
run into what is generally referred to as 'tip in' and your drivability will
start to suffer. Here in UK we generally wuss out long before this and go IR
with weber style TBs.

For the boosted app I would suspect that the drivability gets even worse.

Bigger is not always better with throttles. Unless you really want peak
power at 8500RPM.

Bill
----- Original Message -----
From: "arnie" <arnie_ at charter.net>
To: <diy_efi at diy-efi.org>
Sent: Saturday, October 12, 2002 11:04 PM
Subject: Re: [Diy_efi] Throttle body sizing


> Jeff, and just what would make it to large?  One more; what
characteristics
> would be experienced if too large?
>
>



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