I am thinking about putting some “juice” on my 83 XJ-S V-12. Does anyone have
any thoughts as to why I should/shouldn’t or can/can’t do this? I have about
90% of it planned out so far…
I was planning on making 2 custom injector plates (one for each manifold) and
installing them between the throttle bodies and the intake manifolds–making a
“dry” set-up.
The fuel would be supplied to the fuel solenoid via that threaded piece on the
fuel rail (which is not being used for anything now). And the Nitrous would
obviously come straight from the bottle, which would be mounted in the trunk.
The system would be electrically activated by what is now the Full Throttle
Kick-down Switch. (I would install another microswitch on the bell crank at
about 90% throttle for the kickdown.) There would also be a pressure switch on
the fuel rail and the Nitrous line to prevent operation below
specified/predetermined pressures.
I would also have a covered toggle switch somewhere in the console that would,
A.) supply power to the system, and B.) open the bottle using a remote bottle
opener.
Of course I would have to invest in some cooler spark plugs (Any suggestions
on brand or temp?) and I would have to retard the timing a few degrees at
W.O.T…
So I guess my main concern is, will this engine be able to handle it? I only
plan to use 75 HP jets (at least for starters). I know it would be a really
challenging and fun project.
Let me know what you all think.
Thanks,
-Mike D. 83 XJ-S V-12
MIke: This has already been done, just don’t remember who did it. They
used induvidual injectors though. I think NOX made the setup for them.
Chad Bolles
803 798 3044
FAX 803 798 4512
Mike Diakoulas wrote:
I am thinking about putting some “juice” on my 83 XJ-S V-12. Does anyone have
any thoughts as to why I should/shouldn’t or can/can’t do
Of course I would have to invest in some cooler spark plugs (Any suggestions
on brand or temp?) and I would have to retard the timing a few degrees at
W.O.T…
So I guess my main concern is, will this engine be able to handle it? I only
plan to use 75 HP jets (at least for starters). I know it would be a really
challenging and fun project.
Well that helps… Actually my first thought was to make 2 injector plates
and install them between the HEADS and the MANIFOLDS, making a “wet” set-up.
But that would cost who-knows-how-much and be a real pain in the ass. If I
were to use individual injectors, there would be so much plumbing the hood
wouldn’t be able to close.
I’m going to check out the Engine Mod section of Kirby’s Book and get some
more ideas.
Thanks,
-Mike D.
===== Original Message From Lamborghini@worldnet.att.net =====
MIke: This has already been done, just don’t remember who did it. They
used induvidual injectors though. I think NOX made the setup for them.
Chad Bolles
803 798 3044
FAX 803 798 4512
Mike Diakoulas wrote:
I am thinking about putting some “juice” on my 83 XJ-S V-12. Does anyone
have
any thoughts as to why I should/shouldn’t or can/can’t do
Of course I would have to invest in some cooler spark plugs (Any
suggestions
on brand or temp?) and I would have to retard the timing a few degrees at
W.O.T…
So I guess my main concern is, will this engine be able to handle it? I
only
plan to use 75 HP jets (at least for starters). I know it would be a really
challenging and fun project.
Let me know what you all think.
Thanks,
-Mike D. 83 XJ-S V-12
Mike: If I remember right the guy had the system on an XJ-S, all under
the hood. I also think he said that NOX did it for around $ 1000.00.
Chad Bolles
Mike Diakoulas wrote:
Well that helps… Actually my first thought was to make 2 injector plates
and install them between the HEADS and the MANIFOLDS, making a “wet” set-up.
But that would cost who-knows-how-much and be a real pain in the ass. If I
were to use individual injectors, there would be so much plumbing the hood
wouldn’t be able to close.
Thanks,
-Mike D.
MIke: This has already been done, just don’t remember who did it. They
used induvidual injectors though. I think NOX made the setup for them.
Chad Bolles
803 798 3044
FAX 803 798 4512
I can’t just pay someone else to do it. Half the fun is doing it myself.
Although I would like to talk to someone about it. When you say NOX, do you
mean NOS (Nitros Oxide Systems) or is there a company that I am not familiar
with?
So far (if I am adding corectly) the whole system will cost about $500 and
another $175 if I want the remote bottle opener. Maybe I am missing something
important if you say it should be $1000…
Later,
-Mike D.
===== Original Message From Lamborghini@worldnet.att.net =====
Mike: If I remember right the guy had the system on an XJ-S, all under
the hood. I also think he said that NOX did it for around $ 1000.00.
Chad Bolles
Mike Diakoulas wrote:
Well that helps… Actually my first thought was to make 2 injector
plates
and install them between the HEADS and the MANIFOLDS, making a “wet”
set-up.
But that would cost who-knows-how-much and be a real pain in the ass. If I
were to use individual injectors, there would be so much plumbing the hood
wouldn’t be able to close.
Thanks,
-Mike D.
MIke: This has already been done, just don’t remember who did it. They
used induvidual injectors though. I think NOX made the setup for them.
Chad Bolles
803 798 3044
FAX 803 798 4512
You are probibly right, it is NOS the company and they did the system
for around $ 1000.00.
I also agree half the fun is doing it yourself.
Chad
Mike Diakoulas wrote:
Hey Chad-
I can’t just pay someone else to do it. Half the fun is doing it myself.
Although I would like to talk to someone about it. When you say NOX, do you
mean NOS (Nitros Oxide Systems) or is there a company that I am not familiar
with?
So far (if I am adding corectly) the whole system will cost about $500 and
another $175 if I want the remote bottle opener. Maybe I am missing something
important if you say it should be $1000…
Hi Chad: The fellow we are all thinking about is in the Jag-lovers web site.
His name is Phil Stuart at: http://www.jag-lovers.org/snaps/snap_view.php3?id=934590530. I spoke at some
length with Phil and he was very candid about the use of NOS in the XJ-S. At
the time I spoke to him I was disheartened about supercharging the V-12 and
was consid-ering a custom NOS system. I contacted so many people during that
time including NOS themselves. Also Walsh Jaguar in the northeast had done a
six cylinder and they said they didn’t want to do another one. NOS also
declined in trying to do the project. I became very curious but they would
not tell me spec-ifically what the problems were. Phil bought his car, I
believe, already on the bottle. His comments were that he had filled a
garage with the parts and bits and pieces of his car that had been trashed by
the Nitrous. He had blown just about every part of the drive train and had
done much the same with the engine. Also, he did mention that NOS comes on
only at full throttle and that makes it really clumsy for just general fast,
“press-on” driving. At the time he wrote to me he said that he had not
filled the bottle in a couple of years. I tend to believe him. His car has
been built up quite a bit anyway and I guess the problems of the extra
liability of engine and drive-train outweighs the performance that can only
be used in a straight line competition anyway. NOS has no value for a track
racer only for the drag strip.
One other thing, this last week, in queens NY two cars were drag racing
in traffic and one of the cars seemed to have lost traction and went into the
oncoming lane hitting an oncoming car the other racer lost control of his car
and spun out on the street. All and all there were 6 people in the accident
and 3 were killed both of the wives of the racing drivers went to hospital
with serious injuries while the oncoming driver got away with minor injuries.
The two racing cars were a Lamborghini Diablo and a Corvette. One of the
two cars was on NOS
but since both of them had lost control I don’t think it really matters. Few
streer/race cars are capable of handling the jolt of NOS at full throttle.
I decided years ago that NOS was not the way for me to go. I hope the
person who is considering it thinks carefully about his XJ-S as a total car
and not just a one-trick-pony that only comes on at full throttle. There are
so many other ways for an XJ-S to go fast as both you and I know.
Bradley Smith
1985 TwinWhipple-Supercharged XJ-S Coupe
New York, NY
-To unsubscribe go to http://www.jag-lovers.org/cgi-bin/majordomo
Hi Mike: I am going to paste this response I sent to Chad earlier this
evening…I have gone the route researching NOS. Perhaps this posting will
be of interest to you…Hi Chad: The fellow we are all thinking about is in
the Jag-lovers web site. His name is Phil Stuart at: http://www.jag-lovers.org/snaps/snap_view.php3?id=934590530. I spoke at some
length with Phil and he was very candid about the use of NOS in the XJ-S. At
the time I spoke to him I was disheartened about supercharging the V-12 and
was consid-ering a custom NOS system. I contacted so many people during that
time including NOS themselves. Also Walsh Jaguar in the northeast had done a
six cylinder and they said they didn’t want to do another one. NOS also
declined in trying to do the project. I became very curious but they would
not tell me spec-ifically what the problems were. Phil bought his car, I
believe, already on the bottle. His comments were that he had filled a
garage with the parts and bits and pieces of his car that had been trashed by
the Nitrous. He had blown just about every part of the drive train and had
done much the same with the engine. Also, he did mention that NOS comes on
only at full throttle and that makes it really clumsy for just general fast,
“press-on” driving. At the time he wrote to me he said that he had not
filled the bottle in a couple of years. I tend to believe him. His car has
been built up quite a bit anyway and I guess the problems of the extra
liability of engine and drive-train outweighs the performance that can only
be used in a straight line competition anyway. NOS has no value for a track
racer only for the drag strip.
One other thing, this last week, in queens NY two cars were drag racing
in traffic and one of the cars seemed to have lost traction and went into the
oncoming lane hitting an oncoming car the other racer lost control of his car
and spun out on the street. All and all there were 6 people in the accident
and 3 were killed both of the wives of the racing drivers went to hospital
with serious injuries while the oncoming driver got away with minor injuries.
The two racing cars were a Lamborghini Diablo and a Corvette. One of the
two cars was on NOS
but since both of them had lost control I don’t think it really matters. Few
streer/race cars are capable of handling the jolt of NOS at full throttle.
I decided years ago that NOS was not the way for me to go. I hope the
person who is considering it thinks carefully about his XJ-S as a total car
and not just a one-trick-pony that only comes on at full throttle. There are
so many other ways for an XJ-S to go fast as both you and I know.
Bradley Smith
1985 TwinWhipple-Supercharged XJ-S Coupe
New York, NY
-To unsubscribe go to http://www.jag-lovers.org/cgi-bin/majordomo
Martin Fooks was the fellow who added NOS to his V12. He was on the list
years ago - don’t know if he’s still around - check the archives. He also
had some trouble ripping out the rear cage mounting rubbers - had to mount
the cage in solid! His car was very nice-looking, too.
JohnOn Sat, 30 Jun 2001, Mike Diakoulas wrote:
Well that helps… Actually my first thought was to make 2 injector plates
and install them between the HEADS and the MANIFOLDS, making a “wet” set-up.
But that would cost who-knows-how-much and be a real pain in the ass. If I
were to use individual injectors, there would be so much plumbing the hood
wouldn’t be able to close.
I’m going to check out the Engine Mod section of Kirby’s Book and get some
more ideas.
Thanks,
-Mike D.
===== Original Message From Lamborghini@worldnet.att.net =====
MIke: This has already been done, just don’t remember who did it. They
used induvidual injectors though. I think NOX made the setup for them.
Chad Bolles
803 798 3044
FAX 803 798 4512
Mike Diakoulas wrote:
I am thinking about putting some “juice” on my 83 XJ-S V-12. Does anyone
have
any thoughts as to why I should/shouldn’t or can/can’t do
Of course I would have to invest in some cooler spark plugs (Any
suggestions
on brand or temp?) and I would have to retard the timing a few degrees at
W.O.T…
So I guess my main concern is, will this engine be able to handle it? I
only
plan to use 75 HP jets (at least for starters). I know it would be a really
challenging and fun project.
Let me know what you all think.
Thanks,
-Mike D. 83 XJ-S V-12
Hi John: I thought it is Phil Stuart. Of course my memory is slipping since
I am a month away from a tragic birthday. Senior moments come and go. How-
ever the story is the same. Nice guy and very candid. I thought that the
most telling thing about the whole NOS experience for him was that at the
time I talked to him he said that he hadn’t even filled the NOS bottle in a
couple of years. Drive fast but carefully.
Bradley Smith
1985 XJ-S Jaguar Coupe
New York, NY
-To unsubscribe go to
These were given to me by Martin Fooks whose beauiful “Infra red” car
has died. The rear cage tore itself out.
I am very,very leery of the stateside nitrous people. I’ve talked to 2
or 3, none of them seem fluent in V12 language. They all were quick to
qoute prices but none had any knowledge of our cars. they’re deep into
rice rockets and Detroit iron.
I am thinking about putting some “juice” on my 83 XJ-S V-12. Does
anyone have
any thoughts as to why I should/shouldn’t or can/can’t do this? I
have about
90% of it planned out so far…
I was planning on making 2 custom injector plates (one for each
manifold) and
installing them between the throttle bodies and the intake
manifolds–making a
“dry” set-up.
The fuel would be supplied to the fuel solenoid via that threaded
piece on the
fuel rail (which is not being used for anything now). And the Nitrous
would
obviously come straight from the bottle, which would be mounted in
the trunk.
The system would be electrically activated by what is now the Full
Throttle
Kick-down Switch. (I would install another microswitch on the bell
crank at
about 90% throttle for the kickdown.) There would also be a pressure
switch on
the fuel rail and the Nitrous line to prevent operation below
specified/predetermined pressures.
I would also have a covered toggle switch somewhere in the console
that would,
A.) supply power to the system, and B.) open the bottle using a
remote bottle
opener.
Of course I would have to invest in some cooler spark plugs (Any
suggestions
on brand or temp?) and I would have to retard the timing a few
degrees at
W.O.T…
So I guess my main concern is, will this engine be able to handle it?
I only
plan to use 75 HP jets (at least for starters). I know it would be a
really
challenging and fun project.
Let me know what you all think.
Thanks,
-Mike D. 83 XJ-S V-12
My advice for a normal regularly driven car, is don’t do it. I’ve have gone
thru 3 engines, all professionally built at 10-20 K US Dollars a shot. If
the engine survives the 8 second blast, I guarantee parts of your drive
train wont, unless there built for the extra shock to the big HP increase.
I have sheared 2 flex plates, right off the end of the crankshaft. Last one
was custom built out of 4130?? high strength steel. I’ve spit my rear
differential down the freeway behind me, snapped U joints, bent & twisted
driveshafts and totally destroyed 5 rear wheel hubs (partially because I run
13 inch wide tires on the rear) Also destroying two engines as they
approached 10-11000 RPM. The added explosive power of adding 3 times more
fuel and NOS into your cylinders will deform the piston liners and will
allow anti-freeze and water into your oil pan, destroying your main and con
rod bearings, I know I just rebuilt my bottom end.(I’m running 11.5 to 1
compression ratio)
My original one was a fogger kit purchased 12 yrs ago from 10,000 RPM, 250
HP boost, two injectors inserted just after the butterflies (about $250.00
back then). You must run an additional 32 psi fuel line into the injectors
so you don’t lean out.
I later went to direct port injection (500 HP increase) Just to set a track
speed record of 184 MPH in Portland with a street car and to wipe the smirks
of the faces of new Corvettes and Vipers in a stoplight to stoplight street
race.
The bottles have been empty for a couple of years now. Everyone in town
knows I run NOS, so I don’t get challenged anymore on the street. Plus it
can only be applied at full throttle conditions.
I still race every second weekend at a local track, with much fewer break
downs than with the NOS.
So in closing unless your willing to dump 10’s of thousands of dollars into
your engine and drivetrain. Don’t do it. Even the smaller 100-150 HP kits
are OK for the occasional boost, it will cost you in the long run.
Note: If you want to see a good movie with lots of NOS go see The Fast and
the Furious.
Questions? feel free to ask, off digest, please.
Phil Stuart
Koenig XJS (WildCat)
Could be that there was more than one bloke who tried the NOS. I was
unaware of Phil but did correspond with Martin some years ago. One of the
mods he made was to install NACA ducts in the bonnet on either side -
about where the supercharger clearance bulges are on each side of the
bonnet on your car.
Photos of Martin’s car are probably posted somewhere on the jag-lovers
site. I believe it was a black cherry metallic.
He had quite a bit of trouble with the rear cage mounts. They’d fail,
presumably when he hit the switch. He eneded up welding the cage in
place.
How did you address this potential weakness? Of course, since you don’t
have NOS, I assume that your power does not come on quite as abruptly and
it was probably the shock loading that did in his cage mounts.
I recall also at the time that this failure spawned a bit of discussion
about the need to add another link or two at the bottom center of the diff
to keep the cage from rotating about. If memory serves, didn’t you also
add struts to the cage?
ever the story is the same. Nice guy and very candid. I thought that the
most telling thing about the whole NOS experience for him was that at the
time I talked to him he said that he hadn’t even filled the NOS bottle in a
couple of years. Drive fast but carefully.
Hi Phil: I thought that it was you I spoke to and yet everyone else seem to
think it was someone different. Maybe both of you did a NOS thing. I would
think that part of the problem is that the XJ-S is a 4,000 lb car and getting
it moving on a sudden jolt is very hard for the drive train. Who built you
engines? I have pretty much finished (if you can ever really finish an enthu-
siast’s car) my 6 liter XJ-S with twin Whipple Superchargers. It dynoed very
well in street tune (520+hp/526 lbs of torque) and with the “race” pulleys on
the blowers it jumped just about 100 hp and 100 lbs of torque. Even with 620
hp and 625 lbs of torque I have to drive differently and try not to put the
drive train in peril. Of course I don’t have much interest in “drag” racing
(I am not being judgemental here) my whole thing is “press-on” driving on the
open roads and lately I have become very interested in GT racing on a ser-
pentine track. Your experiences with NOS and your candid explanation of the
dos and don’t will undoubtably save unknowing potential NOSers a great deal
of money and heartache. I have learned that you really have to “think twice
and cut once.” My hat’s off to you.
Bradley Smith
1985 XJ-S Jaguar Coupe
New York, NY
-To unsubscribe go to
The older kits had virtually no control and were known for blowing engines.
When you have your finger on a button theres no way to know how long to
press it. The sport compact car industry has done one good thing with
Nitrous and it is now reliable when used in small doses. Plus newer kits can
be computer timed and controlled so just the right amount of NO and gas is
injected.
Many people take a 170HP Acura Integra and add 25 to 75HP or so. I would say
a 50 shot or 75 shot NO would do no permanent or major damage to the Jaguar
V12. I dont think he was talking about 200 plus HP kits for racing, where
you are basically doubling the engines HP, this will chew up parts just like
you said.
I would say if you go conservative you will do fine, pick up a couple import
compact car mags to get some ideas.
DA
1994XJ12----- Original Message -----
From: “Wht-knt” wht-knt@home.com
To: v12-engine@jag-lovers.org
Sent: Sunday, July 01, 2001 5:36 PM
Subject: [v12-engine] Nitrous Oxide on a V-12 ?
My advice for a normal regularly driven car, is don’t do it. I’ve have
gone
thru 3 engines, all professionally built at 10-20 K US Dollars a shot. If
the engine survives the 8 second blast, I guarantee parts of your drive
train wont, unless there built for the extra shock to the big HP increase.
I have sheared 2 flex plates, right off the end of the crankshaft. Last
one
was custom built out of 4130?? high strength steel. I’ve spit my rear
differential down the freeway behind me, snapped U joints, bent & twisted
driveshafts and totally destroyed 5 rear wheel hubs (partially because I
run
13 inch wide tires on the rear) Also destroying two engines as they
approached 10-11000 RPM. The added explosive power of adding 3 times more
fuel and NOS into your cylinders will deform the piston liners and will
allow anti-freeze and water into your oil pan, destroying your main and
con
rod bearings, I know I just rebuilt my bottom end.(I’m running 11.5 to 1
compression ratio)
My original one was a fogger kit purchased 12 yrs ago from 10,000 RPM, 250
HP boost, two injectors inserted just after the
Actually my first thought was to make 2 injector plates