Well if this is the case then are the throttle bodies that myself and Daniel
plan on using going to be a good size , in your opnion, on a z18et or will we
need to go bigger (my fj20 t/b sounds the same as the rb30 one, ie 55mm
butterfly)?????????????
Steve.
P.S Daneil your theory sounds o.k comparing t/b butterflies to your weber setup
except that your not taking into account the fact that your 1.8 litre has forced
induction. I think the amount of air that the turbo is going to be feeding into
the intake at high boost levels needs consideration?!?
Peter wrote:
> 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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