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XJ XJ8 / XJR ( X308 ) 1997 - 2003

X308 1/4mile target 10.9

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Old Aug 20, 2019 | 01:59 PM
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Originally Posted by AZjag1999
Sounds like you've tweaked it quite a bit. I've only put a 3.5" intake and 10% pulley on mine and I have broken my original differential and my second diff is on its way out too. That's been the weakest point for me, even with modest power gains.

I don't do drag racing, but on the street, it can keep up well with modern muscle. I've beat several 392 challengers, and stayed toe to toe with a 2019 Mustang GT.

What's been the weakest point of the car in your case?
What do you think is the next best mod with the most performance gain?
1. 98-00 4.0 composite head gaskets
2. 14HU diff . Just 8" and wrong pinion / crown wheel angle
3. AJ26 ECU - incapable knock control
 
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Old Aug 21, 2019 | 12:53 AM
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Originally Posted by AlexJag
Yep know Scott he has a 10% pulley as well. I know he has been struggling to come close to those times since nonetheless it's an achievement. I can justify Scott's times for his modifications, but "Higgins" claiming he runs 12.5 on his 4.0 car with exhaust and k n filter is complete BS, it will take a lot more than a k n filter and your exhaust to go from 13.8 to 12.5 , around 100hp more lol
What you dont seem to understand is the impact of weight. Acceleration is not only depending on HP. My car weights maybe 150 kilos less then a Xjr, thats why is runs faster. If you dont understand its your problem
 
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Old Aug 21, 2019 | 01:46 AM
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Originally Posted by Higgins
What you dont seem to understand is the impact of weight. Acceleration is not only depending on HP. My car weights maybe 150 kilos less then a Xjr, thats why is runs faster. If you dont understand its your problem
Save your breath. None on here that knows these cars will believe you. Go to an actual track and run your 14s 1/4 mile and report back if you still feel like it. Thanks for the amusement though.
 
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Old Aug 21, 2019 | 02:07 AM
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Originally Posted by AlexJag
Save your breath. None on here that knows these cars will believe you. Go to an actual track and run your 14s 1/4 mile and report back if you still feel like it. Thanks for the amusement though.
If a Xjr 4.0 typically runs at 13.5, why would a much lighter car with the same engine not go faster? I dont know what your perception is of the drag times of the Xjr 4.0 but if you would consider take a look at what zeroto60times.com lists as below the Xjr 4.0 runs at 13.5 seconds. Why would a much lighter car have the exact same time? Stop make a fool of yourself. I leave that discussion now, a lot more interested in what Xjr99 is up to with hos car

 
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Old Aug 21, 2019 | 09:32 AM
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Don't mean to throw any shade in either direction, but slips or a video would resolve this.
 
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Old Aug 21, 2019 | 02:05 PM
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https://www.youtube.com/watch?v=nynu...ature=youtu.be
 
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Old Aug 21, 2019 | 02:33 PM
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Originally Posted by jazzyjags
Don't mean to throw any shade in either direction, but slips or a video would resolve this.
I think he said it all here quote: " But note K&N air filter also, when I changed from stock filter engine pulled a lot harder at high revs and quarter mile time dropped from 13.0 to 12.5"

 
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Old Aug 21, 2019 | 09:59 PM
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Originally Posted by XJR-99
I remember this one from a bit back, ...I laughed at the driver (or non-driver) of that Vette. He only knew one method, foot to the floor and hang on.
 
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Old Aug 27, 2019 | 01:43 PM
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Originally Posted by Z07Brandon
Any vids on how the exhaust sounds?
Brandon, recorded two short films with my mobile phone. Not the best equipment to film but its better than nothing. Its not the loudest exhaust around, but I reckon that when I get my hands on 200 cell cats the result will be close to perfect to me


 
Last edited by Higgins; Aug 27, 2019 at 01:49 PM.
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Old Aug 30, 2019 | 05:57 PM
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Sounds great!! Thank you
 
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Old Sep 1, 2019 | 11:12 AM
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#Higgins

Great sound!

Is this the resonated or non-resonated version (only two rear mufflers) ?

Thanks!
 
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Old Sep 1, 2019 | 11:41 AM
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Originally Posted by Marcel de Vries
#Higgins

Great sound!

Is this the resonated or non-resonated version (only two rear mufflers) ?

Thanks!
This is the resonated version.

Sadly Milltek has discontinued the exhausts for X100, not sure about availibility for X308
 
Last edited by Higgins; Sep 1, 2019 at 11:59 AM.
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Old Sep 1, 2019 | 11:43 AM
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Originally Posted by Higgins
This is the resonated version
Thanks , sounds great !
 
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Old Sep 2, 2019 | 01:04 PM
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.
 
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Old Sep 2, 2019 | 01:05 PM
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"Higgins". Now let's see those 12.5 sec runs
 
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Old Sep 2, 2019 | 01:45 PM
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True! Let's see what I can do.. to be continued
 
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Old Sep 25, 2019 | 10:33 AM
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Custom made three row alu radiator. Finally ready. Vs old stock one.


 
Last edited by XJR-99; Sep 25, 2019 at 12:17 PM.
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Old Sep 26, 2019 | 06:56 PM
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Nice
 
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Old Oct 30, 2019 | 05:46 PM
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Several hours in dyno today. We run maps for different loads and rpms. Boost was 25PSI.
 
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Old Apr 18, 2020 | 09:30 AM
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Today
 
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