Yea pity about that 2 vpc design, low rpm off boost torque is better though!
It makes the turbo lag less painful but still, I'd want to have some boost
by 2500 (as much as I like cammed up L's I don't like turbo lag a whole lot)
so I may have reconsider the plain bearing T3 and look for a ballbearing
version or settle for a smaller turbo. The VG30ET turbos are cheap, so I
think it may be a case of put the text books away and have a shot at it ;)
Is the turbo that you got with the motor in good nick? I would even say run
that for a while, some Z18 guys run up to 16psi with the stock turbo (with
aftermarket management, intercooling and avgas) which should produce around
115-120kw at the wheels - enough for high 13's/low 14's -which would give
the 300kw GTS a run for its money at 13.7 .............. hmmm maybe you
should spend your RB25DET turbo money strengthening the driveline if you
havent already :)
Paddy pointed out to me that the Fury cam is obviously a full race spec cam
so driveability compromises may not be worth it, since the only advantage of
having an 8 valve turbo over 16v is that low rpm off boost torque so it
wouldn't do to lose it, depends how much you want up top i spose
We'll see!
- Tom
PS Errol, how are you going with your Z20ET?
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Daniel Kroehn
Sent: Tuesday, 20 February 2001 11:45 PM
To: [EMAIL PROTECTED]
Subject: Re: Z18 turbo (was RE: Turbo'd L series (my s4 rx7 turbo))
I agree with your reasoning behind the different cylinder heads flowing
differently for sure! I was just going on both motors sharing the same
capacity. Let us know how you get on with cams! I was wanting one to bump
peak power output up to about the 7000 mark or just above, but I still have
to do some reasearch in to what this is going to do to my fuel economy! My
aim is to have something that sucks about as much juice as a V6 commywhore
yet more than enough power to blow one (the 220kw version) off at the lights
quiet convincingly.
Daniel Kroehn
Recommending Datrats, supplying quality Datsun performance parts
www.Datrats.com.au
----- Original Message -----
From: Tom Richardson <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, February 20, 2001 7:41 PM
Subject: RE: Z18 turbo (was RE: Turbo'd L series (my s4 rx7 turbo))
> Daniel,
>
> I'm not sure than I agree that the same theory can be applied to the Z18,
> because remember the CA is a 16 valve head and will flow much better at
high
> rpm, so I doubt we would get the same results with the 8 valve NAPS/Z
heads
> unfortunately
>
> Again the white circuit racer (it must be my favourite Z18 car or
something
> :)- it produces peak power at 7000rpm with linished crank, stock rods,
stock
> rockers, 125lb springs..... (same bottom end as a L18) Whether or not you
> want peak power at 7000rpm is another story hehe
>
> I still reckon the roller bearing RB turbo would probably not be the best
> bang for buck though. as it will cost a lot lot more than a older VG T3.
> The r/b turbo is obviously better for the long run though so if you got
the
> cash then spend it for sure!!
>
> We need somebody who has a stock cam and a Fury copy and before/after dyno
> sheets hey :) Wade do a Fury copy so I might have to ring and ask their
> opinion unless any other listers have some more info?
>
> Anyway enough ranting from me :)
>
> - Tom
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED]]On Behalf Of Daniel Kroehn
> Sent: Tuesday, 20 February 2001 6:50 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Z18 turbo (was RE: Turbo'd L series (my s4 rx7 turbo))
>
>
> The one off the RB25det is ball bearing from memory and according to the
> zoom tests it spools up and is producing about 1 bar of pressure at about
> 5000rpm on the CA18det. The T3 however is non ball bearing and they
reckon
> that on the CA, the T3 starts to produce good power from 4000 rpm all the
> way up to 8000rpm. If I'm not mistaken a standard z18et is only good up
> until a bit over 6000. May have to invest in a turbo cam as well to make
> use of this? Anyway that was my reasoning behind the one off the RB
rather
> than the T3 from the VG30det.
>
> Daniel Kroehn
> Recommending Datrats, supplying quality Datsun performance parts
> www.Datrats.com.au
>
> ----- Original Message -----
> From: Tom Richardson <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, February 20, 2001 2:17 PM
> Subject: Re: Z18 turbo (was RE: Turbo'd L series (my s4 rx7 turbo))
>
>
> > Daniel,
> >
> > The CA has a T2 style flange so you will definately need a custom
manifold
> > to use one of these. In my humble opinion, one of the best turbos to
use
> on
> > a ~2L four would have to be the cheap and cheerful ex-CA18/SR20 T25 or
> T28,
> > they ought to be quite plentiful (I should think more so than RB turbos)
> > because of the number of S13 & S14 (& S15!?) owners chasing more power
via
> > larger turbos. The ball bearing T28 (late S14) apparently flows enough
> for
> > approx 170kw-180kw at the wheels- is this enough for you? If not (!)
then
> I
> > agree- go for the big gun RB25DET unit! Is this a ball bearing RB25
> turbo?
> > Sounds like low end response might be a little weak with a normal turbo
> this
> > big on a 1.8L? Also, I thought the (R33) RB25 turbo was a T03?
> >
> > I picked up a stock Z18ET manifold for $50, so I will be running a T3
> sized
> > turbo on my Z20ET. One possibility is the T3 from a VG30ET, it should
be
> > plenty big enough for a 2L! Easy to find and cheap too, hopefully. I
> doubt
> > the stock manifold will pose that much of a restriction, because with
the
> > relatively high N/A compression ratio I will only be able to run around
> 6-7
> > psi of boost..... bring on the 29mm forgies :)
> >
> > - Tom
> >
> > PS Are you planning to keep the standard camshaft or use something like
a
> > Fury copy? Any thoughts on the gains available from such a change
Daniel
> (&
> > list)?
> >
> > ----- Original Message -----
> > From: "Daniel Kroehn" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Tuesday, February 20, 2001 1:09 PM
> > Subject: Re: Z18 turbo (was RE: Turbo'd L series (my s4 rx7 turbo))
> >
> >
> > > I don't know about modifying the cylinder head and intake jsut yet,
but
> I
> > > plan to in the future. As for turbo's I want to use the turbo
attached
> to
> > > the Nissan RB25. It's produces the same power as a T3 but comes on a
> bit
> > > earlier in the rev range, so that might be the go. Check out the
latest
> > > zoom, it has a good tech article on the CA18det and appropriate turbo
> > > upgrades!
> > >
> > > Daniel Kroehn
> > > Recommending Datrats, supplying quality Datsun performance parts
> > > www.Datrats.com.au
> >
>
>
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