HighFlow Cats 4.2/5.0

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Nov 16, 2019 | 12:06 PM

#121

AlexJag

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Joined: Apr 2016

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From: San Diego CA

Quote:

Originally Posted by JagV8

The downstreams also do fuel trimming. (Jaguar detail it in the workshop manual / tech guides.)

Agree

Nov 16, 2019 | 12:48 PM

#122

guy

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From: Ottawa, Ontario, Canada

Hmmm, so I’m running a little rich... color of the exhaust pipes would confirm this. But is there any grave side effect to this?

Nov 16, 2019 | 12:53 PM

#123

AlexJag

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Joined: Apr 2016

Posts: 1,344

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From: San Diego CA

Quote:

Originally Posted by guy

Hmmm, so I’m running a little rich... color of the exhaust pipes would confirm this. But is there any grave side effect to this?

Our cars aready run rich WOT from factory , you could be making this issue even worse, but the really the scary part if it's making it leaner at mid loads when torque comes in. Our cars tuning from factory is borderline lean at mid loads for emissions purposes and very rich at WOT to help cool the engine after running leaner at mid loads. I would put everything back to stock with the 02s, and let me do a proper ECU correction. Might as well get an ECU tune while you're at it , the power gain is pretty amazing!

__________________

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 112.98mph
432rwh Dyno on Mustang Dynometer , Approx 511 crank HP.
2013 XJ 5.0 SC (Alpha Jag ECU, TCU tune, crank pulley), 600+ HP, 11.6 sec 1/4th mi 122mph, 7.6sec 1/8th mi
2018 Jaguar F-Type (AlphaJag ECU TCU, lower upper pulleys intake) 10.77 ,131mph ,700hp

Last edited by AlexJag; Nov 16, 2019 at 12:59 PM.