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If you want a little more growl in your XKR for not a big price.
Had this done today,,basically it bypasses the muffler to the sport side of the exhaust.
It give you a throatier growl and more bangs and pops but if you get tired of it turn sport mode off
and your back to nice and quiet,,best of both worlds.I already had front and middle resonators removed and replaced with X pipe last year.
Doubt it adds any power but it sure sounds faster! In normal mode it is no louder than stock.
I had this done and replaced the stock resonated tips
with straight thru tips for $225 US.. Well worth it to me at least. I really like being able to choose loud or soft
depending on my mood and my female companion ..
Dont mind all the dirt,,has been raining non stop last couple days here..
Anytime you want to line up next to me and see who has the better tires let me know.
Those are over $600 a pair and stick better than Im sure anything you have on yours.
My point was 90 degree connections are non productive...added weight ...non mandrel bends.. welding seemed to be less than ideal.
my tires have more tread....just saying.
Even with the 90 degree connection and compression bends, it nearly doubles the flow just due to area. Course back down again for Tailpipe, but there is at least something to be had.
Plus noise. Which I assume was the main goal.
a 90 degree connection could add some harmonization. like a wind instrument blown through one length of tube, but also across a bottle at the same time. it's interesting, i would never do it, but it's interesting. still dragging my feet, in fact, on getting a drop-in rear exhaust fabricated.
a 90 degree connection could add some harmonization. like a wind instrument blown through one length of tube, but also across a bottle at the same time. it's interesting, i would never do it, but it's interesting. still dragging my feet, in fact, on getting a drop-in rear exhaust fabricated.
I would never risk burning valves to achieve a really cool sounding motor....a lot of time and engineering has gone into the OEM exhaust and back pressure calculations ...if you don't like the sound of a clarinet ..then buy a saxophone.
Been racing cars ,boats and building engines since I was 16,, I am almost 60 now..
I was building Lotus Esprits,442 Oldsmobiles and offshore raceboats when I was 18 ..
If you really think a small bypass like what I did at the rear of a complete exhaust system will affect/burn engine valves you have no clue at all how an engine works..
As for the tire tread ,they are full thread ,,have less than 1000 miles on them..They are supposed to look like that..
Yall have a great night !
You are correct CeeJay,, i did not change any of the original piping,,just added extra and only to the outside "sport" pipe..
Some of these guys just have too much time to post and not enough knowledge..
They make life entertaining though.
and yes extra noise when hitting the sport button was the goal,, Ha!
Originally Posted by Cee Jay
Even with the 90 degree connection and compression bends, it nearly doubles the flow just due to area. Course back down again for Tailpipe, but there is at least something to be had.
Plus noise. Which I assume was the main goal.
backpressure on the stock AF map in our engines is a downstream consequence of multiple decisions jaguar made to attain volumetric efficiency and the best low-end torque possible, not a mechanism for operating within a safe specification regarding heat in the head or its components. it is a negative externality to be reduced whenever and whereever possible, not a precision engineered variable. their goals are described in the technical training manual that can be found here on the forum in PDF format so i'd prefer not to upload it again. NP10 Complete Manual 4-15-09.pdf, "NP10-V8JLR: AJ133 5.0-Liter DFI V8 Engine":
While high overlap is good at high engine loads, the minimal cylinder charge and high intake vacuum at very low loads can lead to poor and unpredictable cylinder charging, as exhaust back-pressure means the cylinder will find it much easier to charge from the exhaust manifold than the intake system. This causes combustion instability, which manifests itself as uneven idle and hesitation under very light load conditions.
At moderate loads, overlap is beneficial, though for different reasons. Although the lower gas velocity eliminates any tendency for the incoming rush of charge air to purge the cylinder, the modest charge volumes and reduced manifold depression mean that a small volume of exhaust gas is drawn back into the cylinder. However, higher intake gas speeds ensure good mixing of this exhaust gas with the fresh charge, so combustion stability is not jeopardized.
This effect, known as internal exhaust gas recirculation (EGR), actually improves both the volumetric efficiency of the engine by reducing the work the engine has to do pumping a fresh air charge into the cylinder as well as its partload emissions performance because the exhaust gas is inert, and does not interfere with the combustion process.
if you can burn clean air, then that's what you do. if the engineers could open a wormhole behind every exhaust valve, they would.
when you like 95% of something elegant and the remaining 5% is well within your ability to modify to your own liking, you'd be a fool to throw it away for any spurious alternative. besides, saxophones are hideous to behold.
Yall too funny..
Been racing cars ,boats and building engines since I was 16,, I am almost 60 now..
I was building Lotus Esprits,442 Oldsmobiles and offshore raceboats when I was 18 ..
If you really think a small bypass like what I did at the rear of a complete exhaust system will affect/burn engine valves you have no clue at all how an engine works..
As for tire tread to the guy with all the MGs living in alabama,,they are full thread ,,have less than 1000 miles on them..They are supposed to look like that..
Yall have a great night !
i went to give this post a like, but the button's gone.
CeeJay:
htrdlncn
short version of
hotrodlincoln
or
hotrodlincoln.org
had the same name on every forum,ebay,facebook,etc for the past 25 years so just kinda kept it.
wrong XKRAU..
1. I dont need to remove anything to open the exhaust,I just hit the sport button.
2. the stock xkr muffler runs the sport side thru muffling material something that diagram doesnt show you so still quieter than a straight pipe.
That little bit of pipe added weighed maybe .5lb a side and the tips I removed were at least that much heavier than what I installed so gained no weight
Amazing the amount of negative Nellys on here.
Try to learn or at least listen instead of being negative and you may be happier in life.
Either way hope yall have a great night.
I have no back-box whatsoever, on dyno my car was 17 horses down (493)
So without a tune being laid on yours or mine to capitalise then potentially the ECU won't be taking airflow exit volumes into ac****.
I'll probably get a tune done later in the year or next
Same problem here sorta... Had a catalytic convertor issue and when I opened them up foam that wraps around the bricks had come loose on one causing restriction, then cranky car. Too cheap to buy new I gutted them, installed a 2" perforated tube and packed them with ceramic glass, welded them back together making mini glass pacs out of them but they look factory, welds on top. By pure accident the sound is beyond amazing. I mean delicious when you get on it and stock ish maybe a little throatier when just driving. No drone at any rpm with fuse 19 missing. However my but dyno tells me I may/am down on torque a little, and my O2 sensor needs a spacer to remove cel. I also need a tune to take advantage of the fact she can now breath. Have you ever looked at a 1200 cell brick followed up by another 800 cell brick, it's simply amazing that all that exhaust at full song goes through them bricks with no issues.
These are hot rods. This is what we do. No issues here. Nice tires
04-29-2021, 04:51 PM
If you want a little more growl in your XKR for not a big price.
