I think your assessment to revert back to stock is correct.

 

Welcome to the forum Ibby. That's one hell of an introduction. When you get a moment stop by our new members area : New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum

The exhaust tone in that clip sounds pretty outrageous, and the popping is something else again. I would have thought it a good thing?

I have some questions for you...

What sort of note were you hoping for? I know when I changed to 100 cell cats on my XJR the exhaust became 1. louder & 2. more metallic/raspy sounding. Which I was OK with TBH.

Are you thinking of changing back because of the drone? Maybe it could be addressed with some other exhaust changes, maybe an x-pipe or hotdogs? I don't know exactly but i'm sure it could be resolved.

Did you fit any extensions or minicats to the downstream O2 sensors?

Thanks & again, welcome to the forum.

 

Please see my reply below : )


Wanted more of the V8 sound with touch more depth, the V8 sound is not possible because the engines are short strokes from what I've been told.

The car sounded nice stock with the active exhaust off, its nice now also but can sometimes sound abit OTT during normal driving.. I could live with the sound to be honest but had the orange come up. So that's the decider for me.. I think a 300 cat might actually be the perfect balance!

MiniCats

Thank you also! Is there anyway I can change my user name btw?.

 

Thanks for the reply Ibby

The AJ133 is pretty close to square, 92.5mm x 93mm bore & stroke, not what i'd consider a short stroke. The firing order however does have a lot to do with the tone of the engine.

Ha that's funny, to my ears the F-Types already sound OTT straight out of the factory.

You mean you got a check engine light?

And following up from you put the Minicats on to get rid of the light / fault codes?

Minicats create as many problems as they solve. The downstream O2 sensors are also used to manage fuelling, minicats slow the response down and also cause the sensors to read false (which solves the fault code problem) BUT this false measurement messes with the fuelling and can also cause a momentary lean condition when you plant your foot.

Some more info in this thread https://www.jaguarforums.com/forum/x...0/#post1210265 that thread is dealling with older model Jags but the same applies to the new cars, even more so with 3x O2 sensors per engine bank.

You mentioned in your intro post that you had the car tuned by an ex-JLR/Volvo R&D guy, he couldn't disable the Catalyst Efficiency Monitoring in the ECU or change the emissions settings to Euro2? That elimnates the fault codes if you run high-flow cats (or even no cats LOL) and you don't have the fuelling issues from the sensors reading falsely because of Minicats.

Some late model Jags and Range Rovers have actually lost power because of fitting Minicats.

I'm sure a lot of people will be interested to know what the power figures of your car are after this tune was done. I definitely would like to know more about what he did and how (we also have an ex-JLR guy working on tunes and other tweaks).

Yes but I can't do it for you, only JimC64 the forum Admin can change usernames, send him a private message i'm sure he'll help you out.

Cheers.

 

Please see the below

Good to hear, is this aka a crate engine?

I didnt have the cats at the point when creating the map also I want to keep the baseline settings of my car in line with Jaguar i.e. not disabling systems inplace. Will look into 300 cell race cats as mentioned earlier, I believe these will indeed be compatible with the car and provide the optimum race sound without downfalls of the 200 cell cats that I have had on my car.

Noted & Thank you

I wont be able to get details of the map unfortunately. Pertaining my high speed runs I can say the F-Type does not respond to heat well, I noticed on a few runs that anything over 27deg reduces the cars abillity to climb efficiently after 170mph. FYI on my maxspeed run it was a dry morning with the sun rising and the outdoor temp was apprx 17deg.

Thanks again Cambo!

 

Holy moly that car sounds amazing! Well played sir, well played indeed.

Side note,
The Factory F-type cats came in, I have them sitting in the lab now for measurements to build the assembly fixture.

I'm wrapping up the 4.2 Fixture and cut extra material to build this fixture as well. I'll be able to build sets shortly. Then we can play around with 100 / 200 / 300 cell variations and see what we can create.

Regards,
Derek Fricke

 

Awesome! Hopefully with some videos too

 

Finishing up the fixture for the XKR, I have the F-type cats on hand and I'm having some plate cut to setup that fixture. Should have a finalized set for the XKR in a week or so.

The first F-type setup I'll be wrapping up will fit:
K16260 to K22184 models. These will be Calico coating ceramic chrome coated as well. I'll have some pics coming soon.

Regards,
Derek Fricke

 

Any potential for the v6 S? Btw, I really appre ciate what you're doing for the jag community!

 

Who made your CATs, just a local exhaust guy or a vendor?

 

Mango,
Yes this set I'm building will fit up for the V6S as well.

No problem. I figured I have the ability to engineer/design/build the products. So why not, I truly love prototyping and seeing the potential these cars have.

 

I fear some arrangement is required for the down stream sensors, if using straight pipes or even high flow cats that results in more pollutants in the outgoing air. i wounder if there is a mechanical arrangement - e.g. space - to trick this sensor to give the thumbs up or maybe wind up the ECU parameters alarm threshold??

I have the F-Type V6, tuned it to stage one, impressive 25% more peak power, I asked my guy about getting rid of the Cats or replacing them with high flow, he was worried about the gases sensor since he hasn't done that on Jags.

 

Who provided the tune, your local shop?

 

Evolvetech. Did stage one.

 

Yes Zoozth. When using a straight pipe "cat delete" you would want to use a mini cat O2 spacer for the downstream O2. Pertaining to the highflow 200 cell cats options, the higher durability cats are key. The better the quality of the cat, the less Nitrogen. The other key to preventing the CEL light is to make sure you mount the 02's in the same position as factory.

Regards
Derek Fricke

 

Or get VW to tweak the firmware for you...

 

Welcome to the forum zoozth, nice to have another Aussie here.

When you get a moment stop by our new members area and introduce yourself ==>> New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum


Yes if you fit high-flow cats then yes you need to do something, otherwise you will get Catalyst Efficiency codes and a check engine light.

There are several ways to do this, some methods are better than others.

Although minicats will stop the codes being set, they create other problems because the ECU uses the downstream sensors for fuelling control in addition to monitoring the performance of the cats.

If you fool the downstream O2 sensors your fuelling will be affected, and as mentioned earlier some late model Jags & Range Rovers have actually lost power & economy using minicats. Removing the minicats and changing the emissions to Euro 2 has seen power gains, as well as improvements to fuel economy.

No, that won't make any difference.

The best way to sort this problem is to disable the catalyst related codes, set the thresholds for the codes to zero, or change the vehicle emissions settings to Euro 2 as the cats are not monitored in Euro 2 vehicles and the downstream sensors are only used for fuel trims.

Have done this with several vehicles now, including my own.

 

Thanks mate, i talked to my guy today. He agrees with you. Only issue with f type. The Cats and pipes are physically one piece. So either cut and weld which means not easy going back or build a while thing from the flange to the muffler which is expensive 😕

 

The downpipes aren't all that special, the only real complication is the flanges that will need to be fabricated.



They won't be an off-the-shelf flange, but not overly difficult to make either.

Shouldn't be that expensive to do...

 

Any chance you have a schematic showing scale and sizes of all the parts?