Well put trevor,
bigger is not always better, you must have everything working together or it
is a waste of time.
Been there done that!!!! Found out the hard way.
Peter
Logistic Motorsport
----- Original Message -----
From: Pooley, Trevor <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 28, 2001 1:02 PM
Subject: RE: Throttle Body size??????
> Daniel,
>
> You should be able to work it out theroetically.
>
> I haven't done the maths yet but will have to investigate. Should be
easier
> to work out for a NA motor than a boosted intake but simular principals
> should apply. Think about main venturi's in DCOE weber's Small ones
increase
> air speed at low revs (ie throttle response) but at the expense of
outright
> flow at higher revs (hence their common description of Chokes).
>
> Have look at some racing cars F2/3. They have a small resticter in front
of
> a massive plenum (Which must stuff up flow at higher engine speeds). The
> outright rally cars have a restricter and only make 10hp or so more the
> Group N.
>
> OK so what is the reverse of all this. Poor low rev throttle response.
Also
> why go big if there is a restriction in other areas. Ports, valves,
> intercooler, intake plumming also consider manifold length, diameter and
> plenum size etc.
>
> Bottom line is everything must work together and going too big with the
> thottle body may make it undriveable at low revs. It may make the system
> mismatched in other areas making the whole thing worse.
>
> Regards
> Trev
>
>
>
> -----Original Message-----
> From: Daniel Kroehn [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, 28 June 2001 10:34
> To: [EMAIL PROTECTED]
> Subject: Re: Throttle Body size??????
>
>
> Just wondering Trev, how you go about figuring something like that out?
Any
> simple equations to do so or is it more about an experienced guess?
>
> Daniel Kroehn
> Recommending Datrats, supplying quality Datsun performance parts
> www.Datrats.com.au
>
> ----- Original Message -----
> From: Pooley, Trevor <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, June 28, 2001 9:54 AM
> Subject: RE: Throttle Body size??????
>
>
> > Steve,
> >
> > I would be looking at how many CFM your engine needs at that boost
level.
> > Then I would find out what T/B size suits.
> >
> > Regards
> > Trev
> >
> > -----Original Message-----
> > From: steve taylor [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, 27 June 2001 5:40
> > To: ozdat
> > Subject: Throttle Body size??????
> >
> >
> > Hey everyone,
> > Im about to replace the restrictive stocky z18et throttle body. My
> > question is what size t/b do you guys think would be appropriate?? Im
> > currently running a standard fj20 T3 turbo at around 15-17psi?!?! I have
> > been able to get my hand on a standard 55mm fj20 t/b (thanks matt) do
> > you think this will be big enough or do you think i am better off going
> > for something bigger like the 65mm ford ones??? In the future will
> > prolly be investing in a T3/T4 turbo in the hunt for more power.
> > Any thoughts
> > Steve.
> >
> >
>
>
>
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