For all those who might of got lost in the shuffle or forgot this too.
Francios's reply well below adequately describes the differences between the
N9TE and N9TEA.
I add from Jim Lill:
> > > The 88 and 89 wagon are N9TEA w/160HP
> > > 87-89 sedan are N9TEA w/180HP
> > > > only the N9TEA regulates boost via the EZK ECU
Regarding the decreased HP in the wagon:
"I think that the boost or timing is limited at high rpm on it, thus the
HP. The Torque at 2000 RPM is the same. A ROM swap in the ezk will make it
a "sedan""
And finally a comment from myself and Joe Grubbs regarding N9TEA:
John Goodyear wrote:
> Like I said, If the 505 turbo has the system as described above, and I
> understood Joe correctly. There is no need for anything else to increase
> boost. No SAAB ECU's and electronics. No $5.00 aquarium valves and
silicon
> hose. No hand made comparators to control boost.
>
> Am I missing something here Guys? I would beg for a system like this in
my
> Conquest.
Exactly what I'm thinking--I try to tell people that if you
are blessed with an N9TEA, don't try to re-engineer the car.
The turbocharger technology used in these later 505 Turbos
was developed from years of Peugeot's racing experience.
This adaptive boost/ignition control was perfected in the
205 and 405 Turbo 16 rally cars. I have a Popular Science
article from the mid-80s that says Peugeot extracted
420+ bhp (!!!) from the 505 Turbo's motor for race purposes
using this technology--everything you need is already there...
Happy Hot-rodding!
Joe
Happy Hot-rodding!
John
-----Original Message-----
From: Francois Dion [mailto:francois@hyperreal.org]
Sent: Tuesday, August 04, 1998 3:00 PM
To: John Goodyear
Cc: 'Peugeot Mailing list'; Antares987@aol. com; Joe Grubbs; Jim Lill
Subject: Re: Electronic wastegate
John Goodyear wrote:
> Help me here I am getting confused with all the talk about Wastegates.
>
> First:
> Alan wrote:
> "I'm tired of this inconsistent boost pressure BS. I'm gonna take off
those
> bypass hoses and adjust my rusted up wastegate actuator adjustment."
> He said this, after installing a valve to bleed off boost to the actuator.
>
> In my car this setup works fine. I do not have any electrovalves
> controlling the wastegate. Mechanical boost pressure acting on a
diaphragm
> in conjunction with a spring control whether the actuator is open, closed,
> or partially open. If my ECU detects knock it retards timing not boost.
If
> my ECU detects Serious overboost it shuts down fuel killing the engine
> momentarily to stop impending destruction.
This is my understanding of how it works on the N9TE too. I think
howeverthat
Alan has a N9TEA
> Joe Grubbs Wrote:
> "You can set the boost as high as you want, the ECU automatically
> limits the boost upon knocking. PMA told me that the ECU
> will run the boost as high as possible (upper limit set by
> wastegate actuator) until knocking is detected. Upon knocking,
> it will try to retard the timing by 2 degrees.
Up to here this is what the N9TE will do too.
> If it knocks again,
> it will change the pulse width to the electrovalve slightly to
> reduce boost pressure by about 2 psi. After a time interval,
> it will allow boost to increase. If it continually has to
> reduce boost, the ECU learns the correct pulse width to use
> as a baseline. It is my understanding that this memory is
> erased when the ignition is turned off."
This is N9TEA operation. You cant do that on a N9TE. It hasthe equivalent of
the
Saab APC.
> Like I said, If the 505 turbo has the system as described above, and I
> understood Joe correctly. There is no need for anything else to increase
> boost. No SAAB ECU's and electronics. No $5.00 aquarium valves and
silicon
> hose. No hand made comparators to control boost.
The comparator is basically a replacement to the Saab APC unit. I
waswondering
if APC or not, let's say you have an ECU or even simple
comparator that does the job, it's still a mechanical wastegate that does
the job, and was wondering if an electromechanical device wouldn't be
better than a pressure mechanical device. Faster and possibly more
precise...
Jim told me about the N9TEA wastegate electromechanical valve,
and I tought it was something like that, but it's yet another APC style
way of controlling boost (a valve on the wastegate hose) unless I
misunderstood totally the concept. The same thing a Greddy Profec
or HKS boost controller will do. None of these address the fact that
the wastegate triggers at anything between 500 something mBars to 800+
mBars on a wastegate adjusted to 620 mBars on the N9TE for example.
I wonder if the wastegate at it's shortest would react more precisely. If
it does, then I would slot the end so that I can still activate the
wastegate
with a solenoid and keep the mechanical actuator for regular operation.
If a problem appears (detected by the comparator unit), the solenoid
kicks in. This should be an exception, not the rule and so no intensive
on/off of the wastegate.
Ciao,
Francois Dion (francois@hyperreal.org)
-- Member: FLU #1722, PCNA http://www.fortunecity.com/silverstone/zagato/101/launch.html Alfa Romeo, Fiat, Lancia, Peugeot, Volvo, Solex