Namless Cats Dyno Results
#21
#22
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Here is another thread with a larger exhaust, where just downpipes (without cats where installed). That yielded about 10-12 rwhp.
https://www.jaguarforums.com/forum/x...es-dyno-41275/
Most other dynos I've seen on our cars with sport cats where about the same. also on my car the sport cats would only have yielded 10 to 15 rwhp or so.
I would also guess that there where other things at play that gave you such a big difference, like jgaxkr suggested or something else, who knows.
Edit: LoL, I missed SteveM post earlier, sorry for the double post.
https://www.jaguarforums.com/forum/x...es-dyno-41275/
Most other dynos I've seen on our cars with sport cats where about the same. also on my car the sport cats would only have yielded 10 to 15 rwhp or so.
I would also guess that there where other things at play that gave you such a big difference, like jgaxkr suggested or something else, who knows.
Edit: LoL, I missed SteveM post earlier, sorry for the double post.
#23
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In turbocharged - yes, turbocharger is a part of exhaust, free flowing exhaust is the best way to improve turbocharger spool.
In supercharged - no, the exhaust is as important as in N/A engines. You do need a backpressure to get good torque and hp curves, especially i low and midrange engine speed.
#24
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@Enderle,
The differences you mention aren’t that big on the engine, and my experience actually was also with the same engine as you have where I would guess at max about 10 to 15 rwhp. For another 4.2 Car like yours (from 2005), it was about similar, even though he had also a larger exhaust on top of the sport cats. Am also not convinced that the stock cats are so bad, 1st of all the area is bigger (/diameter) than the sport cats, meaning you just can’t judge the flow purely based on the amount of cells alone. The lower bend is almost as a funnel, as the pipe is over the full lower length of the cats.
A 30rwhp is something noticeable, so that I certainly believe, but the question is why so many others only report max half of that gain, and you more. So chances are that there maybe was something else at play why your 1st run was lower.
Anyway, please keep the info coming, the more people share dyno results, there more we all learn. Even though if not all results will be as/or above expected.
The differences you mention aren’t that big on the engine, and my experience actually was also with the same engine as you have where I would guess at max about 10 to 15 rwhp. For another 4.2 Car like yours (from 2005), it was about similar, even though he had also a larger exhaust on top of the sport cats. Am also not convinced that the stock cats are so bad, 1st of all the area is bigger (/diameter) than the sport cats, meaning you just can’t judge the flow purely based on the amount of cells alone. The lower bend is almost as a funnel, as the pipe is over the full lower length of the cats.
A 30rwhp is something noticeable, so that I certainly believe, but the question is why so many others only report max half of that gain, and you more. So chances are that there maybe was something else at play why your 1st run was lower.
Anyway, please keep the info coming, the more people share dyno results, there more we all learn. Even though if not all results will be as/or above expected.
#27
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Just did the 200 cell Nameless cats on my 03 XKR at 127,000. Coming up on smog and barely passed last time, so I knew one of my cats was shot and I wouldn't pass so I pre empted.
I previously did the over axle delete and removed the mid boxes as well which I think enhanced the benefit from the NP cats.
I agree with Enderle's 30 HP numbers: there's an appreciable increase in response. Not huge, but definitely noticeable.
On a final note, the car snarls and crackles and pops like the F-Type now.
Money well spent..
I previously did the over axle delete and removed the mid boxes as well which I think enhanced the benefit from the NP cats.
I agree with Enderle's 30 HP numbers: there's an appreciable increase in response. Not huge, but definitely noticeable.
On a final note, the car snarls and crackles and pops like the F-Type now.
Money well spent..
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