XJ XJ8 / XJR ( X308 ) 1997 - 2003

X308 1/4mile target 10.9

 
  #21  
Old 09-12-2017, 04:20 PM
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Originally Posted by greverrr View Post
A DIY Megasquirt 3 kit sounds right up your alley. Then your controlling your engine 100%
+1 on the Megasquirt. This allows you to tune at every point on the curves, puts you in control.
 
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Old 11-28-2017, 12:58 PM
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Some new stuff. 9.99 ?
 
Attached Thumbnails X308 1/4mile target 10.9-ecu_111.jpg   X308 1/4mile target 10.9-kenne_bell_111.jpg  
  #23  
Old 11-29-2017, 04:07 PM
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Originally Posted by XJR-99 View Post
Some new stuff. 9.99 ?

WHat does that MS3 ultimate box do?
 
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Old 11-30-2017, 01:16 AM
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Originally Posted by Count Iblis View Post
WHat does that MS3 ultimate box do?
Controls the engine.
 
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Old 12-03-2017, 07:48 PM
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I love where this is going Now keep going!!
 
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Old 12-03-2017, 08:33 PM
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Here's their site Count.... https://www.ampefi.com/

XJR...is that the 24x or 58x you have?
 
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Old 12-04-2017, 01:53 PM
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Originally Posted by Highhorse View Post
Here's their site Count.... https://www.ampefi.com/

XJR...is that the 24x or 58x you have?

Does it replace the Denso ECU (stand alone) or is it a piggy back?
 
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Old 12-04-2017, 05:14 PM
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Originally Posted by Count Iblis View Post
Does it replace the Denso ECU (stand alone) or is it a piggy back?
From how I've read it, its strictly a stand alone, but XJR, Sean, greverrr or Waterdragon would have to confirm that. My sentiment is it performs somewhat similar to the FiTech on my Corvette.


 

Last edited by Highhorse; 12-04-2017 at 06:44 PM.
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Old 12-05-2017, 09:04 AM
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Megasquirt is standalone and the name ďstandaloneĒ speaks for itself (it can run your engine totally by itself).
With standalone generally what it entails is junking your factory ecu then taking those wires (engine management aka fuel inj, coil packs/ignition, knock sensors, cam/crank sensors, upstream O2, MAP/MAF, ect) and soldering them accordingly to whatever standalone system you may be running.
With some popular cars where standalones are frequently installed you can order plug and play harnessí to plug right in, generally speaking that is not the case for a Jaguar. Good old cutting and matching up wires will do the job most likely. From my experience OBD2 ECUís for modern engine management are usually 50-70 wires and you surely wont need them all for megasquirt
 
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Old 12-05-2017, 10:19 AM
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BTW XJR99 forgot to mention iím very jealous! Thats the perfect setup for what your building, your target is already hit in my eyes. Setup possibilities are practically endless, you can set up a good launch control/2step to help right from the start, dial in a little nitrous, and all the while do it 100% safely. Makes me want to twin turbo mine sooner than later so badly Canít wait to hear more followup
 
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Old 06-09-2019, 03:05 PM
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Originally Posted by XJR-99 View Post
The current set-up should have right parts to do it but needs careful tuning
before any longer WOTs. Today found better MAF tune not to be at too rich or lean side. When that's fine then change from 3" upper pulley down to 2.75" and if still 100% confidence then down to 2.5" and fuel change to E85 or/and water/methanol injection. The minimum target is to go one second faster than car went with old, more stock style engine four years ago. ET was 12.34, so anything slower than 11.34 is disappointment. Cheers.
What software were you using for tuning?
 
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Old 06-16-2019, 07:06 AM
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Originally Posted by Knunley52 View Post
What software were you using for tuning?
Which tune do you mean - MAF or ECU ?
 
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Old 07-10-2019, 07:41 AM
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Very interesting thread and car! congratulations on your achievements thus far!

I have a quiet aim for 10.xx from mine (just bought it) too.

Can you tell me how the megasquirt install went in terms of communication with the gearbox?

I see you're running a twinscrew charger, is this on the stock chargecoolers?

How did you resolve the issue with the gearbox going into limp after changing the rear diff ratio?

Thanks
 
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Old 07-12-2019, 09:47 AM
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It's MS3 Pro Ultimate. The car was in a garage one year waiting for more motivation and time. Now my guy has worked very hard with it last two months. Many smaller or bigger issues resolved and looks like next step is start up and fine tune. Gear ratio change did not make any problems since a spare TCU was remapped for 3.58. I hope - if everything goes well - some real results of last five years of new engine build will be completed.
 

Last edited by XJR-99; 07-12-2019 at 09:51 AM.
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Old 07-12-2019, 09:53 AM
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Sounds good, look forward to following your progress! How did you remap the TCU?
 
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Old 07-12-2019, 12:56 PM
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Generallyf tuning of MB EGS51 is not possible, but years ago one source made tunes for gear ratio changes. They were very expensive. I guess those tunes are not available anymore. Good old days.
 
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Old 07-14-2019, 04:01 PM
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Old Today, 05:02 AM
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Originally Posted by XJR-99 View Post
Generallyf tuning of MB EGS51 is not possible, but years ago one source made tunes for gear ratio changes. They were very expensive. I guess those tunes are not available anymore. Good old days.
So it must be possible, just not widely known how. Who used to provide them?

How did you replicate the CAN signals the gearbox expects from the engine?

Congrats on the recent progress!
 
 

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