Well put, I was just thinking about the off boost response of my turbo
engine as comparison to my NA enigne. For off boost it should behave similar
to my webered L20 if not better considering the zed has a lower comp ratio
and the L20 is set up for power at higher revs. I'm sure that having forced
induction on the zed, shouldn't be hampered too much with less area to flow
through. On the other end of the scale, how wild would it be to give the
turbo engine the same cross sectional area as my webered
engine.............................. Anyway I'll give the RB30 one a go I
think, it's large without been ridiculously large compared to standard.
Just my thoughts anyway
Daniel Kroehn
Recommending Datrats, supplying quality Datsun performance parts
www.Datrats.com.au
----- Original Message -----
From: steve taylor <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, June 28, 2001 5:55 AM
Subject: Re: Throttle Body size??????
> 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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