XJ XJ8 / XJR ( X308 ) 1997 - 2003

S/C car rev limiter question

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Old 03-27-2013, 04:52 PM
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Default S/C car rev limiter question

Hey all again...

got a question....

Do the S/C cars have an "in gear" rev limiter...

when i do a holeshot in sport mode and the car is broiling the tires, the car is a bit of a handfull so i cant quite get a good look at the tach, and it seems a though i hear, and or feel a rev limiter, but i cant tell for sure... the tach is really too small to get a good look at to see what the rpm's are at... when all the mayhem is going on.. LOL

this is a first and second gear shifting situation where i am hanging out in second during the burnout....at high rpm's...basically with the trottle pinned to the mat...

TIA for any info... Gerry
 
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Old 03-27-2013, 06:45 PM
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yes there is a rev limiter
 
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Old 03-27-2013, 07:33 PM
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Rock, Do you know what it is set at ?

Thanks
 
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Old 03-28-2013, 12:25 AM
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Link : https://www.jaguarforums.com/forum/x...limiter-41259/
 

Last edited by XJR-99; 03-28-2013 at 01:03 AM.
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Old 03-28-2013, 12:52 AM
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The limiter is an ignition interupt that makes the engine stutter and keep it from over reving...

the "limit"s programed in the ECU...
 
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Old 03-28-2013, 01:01 AM
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Originally Posted by GerryXJR
The limiter is an ignition interupt that makes the engine stutter and keep it from over reving...

the "limit"s programed in the ECU...
I had just a link - it's not my question
 
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Old 03-28-2013, 01:10 AM
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AH..Duh... LOL

Its late and i'm tired.
 
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Old 03-28-2013, 05:19 PM
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The rev-limit is set at 6200rpm on the s/c cars.

You may be interested to know that the s/c cars did not have an uprated & strengthened diff-it's the same unit as in the 4L normally-aspirated cars.

The diff does not have a large safety margin when fitted to the s/c cars, so constant hard use runs the risk of bearing wear or teeth shearing on the pinion-the greatest stress happens during full-bore getaways in 1st gear & there have been cases of diff failure in a few s/c cars...
 
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Old 03-29-2013, 12:46 AM
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Originally Posted by Red October
The rev-limit is set at 6200rpm on the s/c cars.

You may be interested to know that the s/c cars did not have an uprated & strengthened diff-it's the same unit as in the 4L normally-aspirated cars.

The diff does not have a large safety margin when fitted to the s/c cars, so constant hard use runs the risk of bearing wear or teeth shearing on the pinion-the greatest stress happens during full-bore getaways in 1st gear & there have been cases of diff failure in a few s/c cars...
I will test strenght of stock diff soon with Quaife LSD + tight torque converter + soft drag radials.
 
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Last edited by XJR-99; 03-29-2013 at 12:58 AM.
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Old 03-29-2013, 06:10 PM
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Where did you gewt the drag radials from?

That is one of my next purchases on the list...

Cause my car inhialates the street tires
 
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