4.2 Throttle body VS 5.0 Throttle Body
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#7
It's way different on 5.0 If you need one on the later 4.2 same as 06-09 Xkr I can get you a bored out one with larger plate. ECU modification is also needed with this mod to have tb open properly. Pm me for details
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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
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
The following users liked this post:
guy (12-02-2022)
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Hmm were do I start. The car responds different. The car really moves on take off. The car has a sporty feel. I was rolling at like 40mph and hit the gas and it snaps you back in the seat. before it would move but not like now. I get more crackles and pops in sport mode. Sounds real aggressive. The standard Throttle body opening is 75mm I took 5.0 throttle body with 84mm and had it bored to 89mm. Thats a lot of air coming in now, plus I have 4" tubing and big cone air filter. The computer has been adjusting better but I need a custom tune and dyno to get the most out of it. One thing I noticed is that Trans seems not to keep up with engine.
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JaggyBoii (09-15-2023)
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JaggyBoii (09-15-2023)
#16
Trap speed is a indication of how much power you are making its the mph your vehicle has hit when going down the 1/4 mile if stock xk are getting around 96/97mph and you've managed to land 100mph it's a good indication your making more power now .
ET elapsed time focusses more on traction / gearing. Trap mph indicates power
ET elapsed time focusses more on traction / gearing. Trap mph indicates power
Last edited by steve_k_xk; 07-14-2022 at 05:11 PM.
#17
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.
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.
Last edited by steve_k_xk; 12-01-2022 at 10:56 PM.