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XK / XKR ( X150 ) 2006 - 2014

4.2 Throttle body VS 5.0 Throttle Body

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  #21  
Old 12-02-2022, 02:13 AM
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Don't forget Steve I bored the sleeve also to fit 89mm Throttle Body. I learned if you bore throttle body and not the opening its kind of a waste. I had the sleeve bored out and reconstructed to get the benifits of the bigger throttle body.

Did you bore your sleeve Steve?
 
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  #22  
Old 12-02-2022, 05:39 PM
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Right so you bored the elbow going from throttle to inlet manifold to suit the larger throttle.

Also what size is the opening on the inlet manifold and did that require match porting as well ?

Will be good to see the amount of airflow you have compared to mine with these mods
 
Last edited by steve_k_xk; 12-02-2022 at 05:51 PM.
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  #23  
Old 12-04-2022, 10:30 PM
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Priv How'd you get on any numbers to report yet
 
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Old 12-05-2022, 02:44 PM
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4" 101mm
The elbow opening to manifold.
 
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Old 12-05-2022, 02:46 PM
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How do I get my rpms that high standing still to measure? 😂 My reader doesn't store history?
 
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Old 12-05-2022, 03:03 PM
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Originally Posted by steve_k_xk
Priv have you got a scanner that reads g/s at your MAF to compare , my readings were the following-
Standard 75/76mm throttle body 258g/s @7400
Maxbore 81mm throttle body 252g/s @7400

Was thinking with the increased rpm the larger throttle would add more power, but across the entire rpm range it was down.
Steve if you had yours ported with larger butterfly installed most likely tb isn't opened all the way at WOT. That's what was happening to mine until readjusted opening values on the ECU. If you need help with this let me know. You can verify full opening with car off , ignition on , visually confirm full opening angle with throttle fully depressed.
 
Last edited by AlexJag; 12-05-2022 at 03:07 PM.
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  #27  
Old 12-05-2022, 10:17 PM
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Originally Posted by Privilegedjaguar
How do I get my rpms that high standing still to measure? 😂 My reader doesn't store history?
Lol your going to have to do it on the fly not stationary going to be interesting to compare figured
 
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  #28  
Old 12-06-2022, 02:02 PM
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Originally Posted by steve_k_xk
Lol your going to have to do it on the fly not stationary going to be interesting to compare figured
you might want to ask if he has original MAF first .....
 
Last edited by AlexJag; 12-06-2022 at 02:04 PM.
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  #29  
Old 12-06-2022, 03:02 PM
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Originally Posted by AlexJag
you might want to ask if he has original MAF first .....
??
Did you guys change it
 
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  #30  
Old 12-07-2022, 12:12 PM
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Originally Posted by steve_k_xk
??
Did you guys change it
I didn't work on his car...
 
__________________
2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
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  #31  
Old 12-07-2022, 02:45 PM
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Then why would I ask whether he's changed it
 
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  #32  
Old 12-07-2022, 03:26 PM
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Originally Posted by steve_k_xk
Then why would I ask whether he's changed it
Well last time he stopped by to get a tune , I refused to work on his car due to aftermarket intake with Chinese MAFs., That was 1.5 yrs or so ago..
 
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2008 XKR Convertible, (mods: AlphaJagTuning ECU Tune , 1.5lb pulley, (200cel cats( are now melted), xpipe, Bosch 001 pump, 180 Thermostat.
Drag strip : 7.9sec 1/8mi 90 MPH . 1/4 mile 12.55 at 111.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 Supercharged, (stock with Alpha Jag ECU tune), estimated power: 600+ hp, 7.7sec 1.8th mi/95mph
Last edited by AlexJag; 12-07-2022 at 03:34 PM.
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