That kind of tire burnin' is an American muscle car trick. Jaguar's trick was to put the power down and move the whole car. Wanna lay rubber? Get a car with a live axle on leaf springs.

Here's a second option for my 25K...put a Merlin engine in whatever it'll fit in.

 

Ok, time to check the timing I guess. The vacuum advance module is new (as within the last year) and I have the 15" wheels. Rebuilt the dizzy last year so the advance is working.

I don't want to spin 'em on a routine basis...I would just like to know that I can :-)

Thanks,

John
1987 XJ-S V12
62,000 miles

 

Actually Powerdyne or Vortech could fit a centrifugal supercharger for our cars that would make it a different animal.

Mercedes Benz SL Class SL600 | eBay





Jaguar Sold XJS 1977 V12 Twin Turbo Race Car Cams Log Book | eBay



Lambo V12 with 6 speed to start, probably more than $25 from a wrecker.

 

All top fuel and top alcohol drag cars use live rear axle (not Leaf springs) as it puts the power to the road better than IRS (FOR THEIR PURPOSE). Going around corners IRS is better.

 

True, though those dragsters do have awfully squishy tires, huge ones, really like one giant tire cuz they're so close together. I wonder if the diff is locked.

 

the best way to put power down on a flat track is a live axle. live axle always has even contact patches, and varries the pressure per wheel, where as independent keeps the pressure closer to even but varies the contact patches.

 

my XJS dont have a live axle, it has the stock factory rear and sub frame, with connector bars, old school stuff!

just changed the ratio, and i have 18" wheels, with 275-35-18 Nitto tires.

so torque multiplication is what spins the tires, its all about torque and always will be, for a street vehicle.

 

Or get a Jag with a strong enough power-to-weight ratio.



Cheers
DD

 

If money was no object, then I'd go and search worldwide for a wrecked XKR-S or XKR 175. Then I would learn/research for the best people to get this R&D nightmare executed, probably in some english speaking foreign country. 540 HP would be more than enough for the XJS to handle, but I'd doubt that it would stay together above 160 mph, let alone the 174 mph rated XK 175 engine. Good thing is that it would still be a 100% Jaguar car.

 

"smooth and easy as a velvet hammer" fun video.

I was being facetious about the live axle.

 

Mine won't spin a tyre either, wet or dry! "In a straight line" but only running on 7 cylinders doesn't help either, neither does the the 3 speed auto, or loose worn out suspension.
For the money, throw away the auto, manual 5 speed is the only replacement, fix the timing and electrical problems (Biggest problem with mine with added fuel leaks), and finally you go ITB's a bit of motor work should give you close to the magic 100hp/ltr, then watch out!

Stay tuned to this channel, I have a second motor and a 5 speed that will built like this for XJS.
If anyone has extractor plans out there that they would like to share please PM me

 

this system worked well for Group 44 in the mid 80s.

 

I'm trying to follow what you're saying here (cuz obvsly I have zero experience in this area but the discussion is interesting and informative), does your explanation require a limited-slip diff or does that matter (the part about varying the contact patches)?

 

Warr are their diffs open? It occurs to me that there may be other reasons for a live axle on those cars. Not to be argumentative, just thinking out loud. They don't really need much suspension and the short live axles are compact. Here's another thing I've always assumed...that a big tough live axle/diff is easy to get your hand on whereas most production IRS setups can't handle the torque. (I'm guessing).

 

Ron, you're engine isn't putting out stock HP is it? Also what rear-end setup are you using in the RX7?

 

My '87 wouldnt spin after sitting for about 10 years. The wires were bad and it had a bad distr. cap.

After just a decent tune up it ran like new!

 

I haven't tried dumping the clutch at redline, but short of that my 4.0 doesn't spin the tires. This is adding to my bias; the car just shoots off down the road. Easy enough to get a chirp on the 1-2 upshift though.

 

All drag Cars and even most pro street cars use a spool or welded axles on the street. Most drag wheels are bolted to the slicks to prevent slip also.

Drag Slicks - Tire Tech - Tire Care - Hot Rod Magazine

Mickey Thompson Performance Tires & Wheels

 

[QUOTE=Scoupe89;844876]Actually Powerdyne or Vortech could fit a centrifugal supercharger for our cars that would make it a different animal.

Mercedes Benz SL Class SL600 | eBay






QUOTE]
You bet it would make it a different animal!
By "our cars" I assume that you refer to the XJS, V12 or I6?
If so, would you know if they may work out a CARB EO approval for CA?
Centrifugal compressor is not really the ideal way to s/c, but it sure is better than nothing, as I find that it'd be easier to adapt a centrifugal compressor (a la turbo) over a traditional, plenum mounted S/C compressor. I can easily kill the lag by selecting the "drive" mode on my N2O injection, which gives me an initial 1/2 second push/kick.

But California doesn't make it easy.

Cheers

 

Good articles, thanks. That Firebird/Camero twisting in one of the photos is what I imagined with a live axle, nicely exaggerated for illustrative pursposes. But most of my "experience" comes from reading Road & Track