[modern] Need for Speed

“malore” wrote:

I would also like to see some more power in the get up. One thing, it is
me or do these Jags appear to move slower than they actually do?

Hey XJ40 Listers:

I have been one of the hot rod tuner guys on the XJS list for 5+ years.
Neat that this post came through as I:

a) Am still madly in love with my XJ40

b) Have decided that just a tad more get up and go would be good.

Since my car has had the annoying “tick-tick-tick” from when I bought it at
28,000 mi (a valve Brett?) a new valve job might be in order, so while I’m
at it…

Here is what I am thinking for mods:

  1. Port and Polish, and “cc” the cylinder heads
  2. Install AJ6 tuned intake runners
  3. Remove cats and build new custom larger bore exhausts (but quiet mufflers
    for smooth jaguar-grace like silence)
  4. Install electric fan to replace (power robbing) mechanical (have done
    this in my XJS)
  5. Larger Throttle Body (does AJ6 engineering sell one like they do for the
    XJS??

Eventually:
6) Blue print and balance the engine for smoother, quieter, and more
powerful operations

Just another 10-20 HP would be appreciated. Well, that’s the plan for now.
Of course, just buying a newer X300 or V8 would solve all these problems,
but this is a touchy-feely thing with our personal cars, isn’t it?
Actually, I’d like a V12 sedan!

Thoughts anyone on this action plan?? Other improvements?

Wayne Estrada
Still Homeless Somewhere in the USA
1989 Vanden Plas (Alpine Green)
1989 XJ-S Convertible (Dorchester Grey)_________________________________________________________________
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Hi Wayne,

With all do respect for your quest relative to the proposed “mods” on your
Jaguar mill. I suspect the changes proposed will not get you a significant
seat of the pants kick that you are looking for. Probably will see some
increase in miles per gallon improvement. Maybe 1 or 2 mpg. The modified
exhaust will show some improvement off the line at about peak torque/hp
point. Maybe for the first 50 feet. But to keep that car street legal it
is going to be hard. Unless one can get CARB equal type cats & pipes. In
the end if you get rid of as much of the interior car weight as you can
stand, no radio, no A/C equipment, no bench seats & carpet, door trim &
upholstery, no spare, no rear carpets in boot or car, put storage cell in
the center of the boot, increase tire pressures 5 to 7 PSIG set the micro-P
so it loops at or about the peak torque points ( select the average for each
shift pint) Some of these are hard to do of course. Or!
Just go find a faster street car. The XJ6 Jaguar is by all do respect a
very fine touring sedan. Fast street car ( 0 to 60 times as low as one can
afford to buy) and a fine touring sedan are not the same thing unless some
very-very-very significant changes are put in place. Besides look how happy
you will be with one of the new Jaguars.
Dave
89 XJ6 bone stock----- Original Message -----
From: “Wayne Estrada” wayne_estrada@hotmail.com
To: modern@jag-lovers.org; xj40@jag-lovers.org
Sent: Wednesday, April 24, 2002 12:41 AM
Subject: [modern] Need for Speed

“malore” wrote:

I would also like to see some more power in the get up. One thing, it
is
me or do these Jags appear to move slower than they actually do?

Hey XJ40 Listers:

I have been one of the hot rod tuner guys on the XJS list for 5+ years.
Neat that this post came through as I:

a) Am still madly in love with my XJ40

b) Have decided that just a tad more get up and go would be good.

Since my car has had the annoying “tick-tick-tick” from when I bought it
at
28,000 mi (a valve Brett?) a new valve job might be in order, so while I’m
at it…

Here is what I am thinking for mods:

  1. Port and Polish, and “cc” the cylinder heads
  2. Install AJ6 tuned intake runners
  3. Remove cats and build new custom larger bore exhausts (but quiet
    mufflers
    for smooth jaguar-grace like silence)
  4. Install electric fan to replace (power robbing) mechanical (have done
    this in my XJS)
  5. Larger Throttle Body (does AJ6 engineering sell one like they do for
    the
    XJS??

Eventually:
6) Blue print and balance the engine for smoother, quieter, and more
powerful operations

Just another 10-20 HP would be appreciated. Well, that’s the plan for
now.
Of course, just buying a newer X300 or V8 would solve all these problems,
but this is a touchy-feely thing with our personal cars, isn’t it?
Actually, I’d like a V12 sedan!

Thoughts anyone on this action plan?? Other improvements?

Wayne Estrada
Still Homeless Somewhere in the USA
1989 Vanden Plas (Alpine Green)
1989 XJ-S Convertible (Dorchester Grey)


Join the world’s largest e-mail service with MSN Hotmail.
http://www.hotmail.com

“David Austin” Wrote:
I suspect the changes proposed will not get you a significant

seat of the pants kick that you are looking for. The XJ6 Jaguar is
by all do respect a very fine touring sedan.

Well, let me clarify. I like my car as is with the Grace, Space, Pace that
it has…just looking for a little more power, but not looking to win drag
races, if you know what I mean.

I disagree with Brett about the head work. Any car in my experience that
gets a flowed head has better HP, the AJ6 mods would be good, and the idea
of the newer/larger air box all have to add to more HP to the equation.
That is all on the intake side, but work on the exhaust side must also be
done too or it willbe unbalanced.

I believe that larger pipes, with a crossover (but quiet mufflers) should
relieve more HP. My catalytic converter is original, and it has to be be
deteriorated after 13 years. Anybody ever see the inside of one of these???
Its a dense honeycomb!! Lower restriction cats are available too.

Bretts comment on the electric fan is 50/50. Lots of new cars are going to
them, so there is a good engineering reason. I noticed a good 5 HP gain on
my V12 doing this conversion. Just a thought.

“Balance and Blueprint” is the process of taking anengine completely apart
and weighing and shaving connecting rods and pistons so that eachis exactly
the same weight. As is from a factory,there are manufacturing differences
in what would seem “equal” components. The result is a smoother running
engine and more HP. I am over simplyfying the process in total, but these
are the basics–whold books have been written on BAL&BP

Lastly, I would NOT want to change the rear end ratio. I like the high
speed feel of this car, and occassionaly like to get it well into the triple
digits like I did driving across the USA last fall (hit 125mph+ at some
point! :slight_smile:

Wayne Estrada_________________________________________________________________
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Wayne,

The one thing I fond with Jags is that the freaking computer controls it all.
So if you change one thing the computers adjusts something else to compensate.
About the only thing I can think of is the recommendation Biggy made on
increasing the fuel pump pressure. That might put more gas in chamber but
unless you get more oxygen then that would result in the computer just adjusting
the frequency to get the right mixture.

However, I have been thinking of adding a Paxton or other centrifugal computer
and taking biggys advice. That would put more fuel and more oxygen which could
result in the computer not noticing the change.

The only problem I have is I have spent $12K restoring my Majestic and touched
everything but the engine. With 188000 I am leery though all seems fine except
for a sight tic tic from one or two valve shims which is insignificant after
those miles. Actually I have no complaint about the pickup and speed since I
cleaned all the elec. connectors including the injectors and put electrically
conductive lubricant on the contacts. Not a hesitation and in 4 dr sedan it is
pretty impressive with the sport mode engaged. It takes a Vette or something
like that to blow me away even in the 50-80 mph range. I am really surprised at
how well it runs with the original engine at 188000

By the way the tic tic is from the shims that sit under the cup between the top
of the valve stem and the cup that the cams run on. What you need to do is but
a feeler gage between the cam and the cup and mark down the clearance on each
valve, check the spec and see how bad the ones that tic are out of spec. You
don’t need to do a valve job just replace the shims with ones that bring the
clearance within the spec.

Wayne Estrada wrote:> “malore” wrote:

I would also like to see some more power in the get up. One thing, it is
me or do these Jags appear to move slower than they actually do?

Hey XJ40 Listers:

I have been one of the hot rod tuner guys on the XJS list for 5+ years.
Neat that this post came through as I:

a) Am still madly in love with my XJ40

b) Have decided that just a tad more get up and go would be good.

Since my car has had the annoying “tick-tick-tick” from when I bought it at
28,000 mi (a valve Brett?) a new valve job might be in order, so while I’m
at it…

Here is what I am thinking for mods:

  1. Port and Polish, and “cc” the cylinder heads
  2. Install AJ6 tuned intake runners
  3. Remove cats and build new custom larger bore exhausts (but quiet mufflers
    for smooth jaguar-grace like silence)
  4. Install electric fan to replace (power robbing) mechanical (have done
    this in my XJS)
  5. Larger Throttle Body (does AJ6 engineering sell one like they do for the
    XJS??

Eventually:
6) Blue print and balance the engine for smoother, quieter, and more
powerful operations

Just another 10-20 HP would be appreciated. Well, that’s the plan for now.
Of course, just buying a newer X300 or V8 would solve all these problems,
but this is a touchy-feely thing with our personal cars, isn’t it?
Actually, I’d like a V12 sedan!

Thoughts anyone on this action plan?? Other improvements?

Wayne Estrada
Still Homeless Somewhere in the USA
1989 Vanden Plas (Alpine Green)
1989 XJ-S Convertible (Dorchester Grey)


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