ECU Tuning Group | Jaguar XF/XFR ECU Upgrade
#64
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I had told myself that I would consider tuning once my 15K service was done. I had that done yesterday. Then I thought that I needed a dyno before and after run, but I didn't know where to look to do a dyno for me.
So this morning Groupon sends me a coupon for a Lotus mechanic 5 miles from me for over half off a dyno run. Jupiter is telling me something.
How much extra gas mileage should I get with an ECU tune? I have an '11 XF 5L, normally aspirated. I get about 14MPG around town, and 18-20 freeway. I don't know if it's because I tend to gun it, or whether the mileage estimates are a lie, but I certainly don't get 16-23 like the sticker said. So, if I can justify the cost to myself in gas savings, I may go for it.
So this morning Groupon sends me a coupon for a Lotus mechanic 5 miles from me for over half off a dyno run. Jupiter is telling me something.
How much extra gas mileage should I get with an ECU tune? I have an '11 XF 5L, normally aspirated. I get about 14MPG around town, and 18-20 freeway. I don't know if it's because I tend to gun it, or whether the mileage estimates are a lie, but I certainly don't get 16-23 like the sticker said. So, if I can justify the cost to myself in gas savings, I may go for it.
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mtravis (06-06-2012)
#67
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#68
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I had told myself that I would consider tuning once my 15K service was done. I had that done yesterday. Then I thought that I needed a dyno before and after run, but I didn't know where to look to do a dyno for me.
So this morning Groupon sends me a coupon for a Lotus mechanic 5 miles from me for over half off a dyno run. Jupiter is telling me something.
How much extra gas mileage should I get with an ECU tune? I have an '11 XF 5L, normally aspirated. I get about 14MPG around town, and 18-20 freeway. I don't know if it's because I tend to gun it, or whether the mileage estimates are a lie, but I certainly don't get 16-23 like the sticker said. So, if I can justify the cost to myself in gas savings, I may go for it.
So this morning Groupon sends me a coupon for a Lotus mechanic 5 miles from me for over half off a dyno run. Jupiter is telling me something.
How much extra gas mileage should I get with an ECU tune? I have an '11 XF 5L, normally aspirated. I get about 14MPG around town, and 18-20 freeway. I don't know if it's because I tend to gun it, or whether the mileage estimates are a lie, but I certainly don't get 16-23 like the sticker said. So, if I can justify the cost to myself in gas savings, I may go for it.
#70
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ECU states “…Through the months of testing and data logging, we noticed that there are absolutely no internal differences, other than exhaust (XKR-S), between the 470hp, 510hp, and 550hp Jaguars. As stated on our previous blog (Jaguar XKR-S ECU Tuning), Jaguar placed limiters within the software that affect each model differently…”
So, why can’t the 510 hp XKR be raised to 605 hp, the same as the XKR-S? Is the exhaust the only thing between more hp?
So, why can’t the 510 hp XKR be raised to 605 hp, the same as the XKR-S? Is the exhaust the only thing between more hp?
#71
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edobernig (06-17-2012)
#72
#74
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Bigcat09 has some other fast cars so I see where he is coming from. I just tuned my saab from 210hp to 270 hp. I wasnt very impressed by it like I thought I would be, because my xfsc is so much faster anyways. I think guys whose jaguar xf is the fastest car they have ever driven will notice the power increase far more then bigcat. Big cat also did before and after dynos and it shows what you get from the tune. Tuning is still the most cost effective way to increase horsepower.
Last edited by bryce804; 06-19-2012 at 06:05 AM.
#75
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Bigcat09 has some other fast cars so I see where he is coming from. I just tuned my saab from 210hp to 270 hp. I wasnt very impressed by it like I thought I would be, because my xfsc is so much faster anyways. I think guys whose jaguar xf is the fastest car they have ever driven will notice the power increase far more then bigcat. Big cat also did before and after dynos and it shows what you get from the tune. Tuning is still the most cost effective way to increase horsepower.
This is precisely why I'm not going to bother tuning my 09 XF SC, my Z06 is crazy fast and my VRod gets up and goes as well. The XF goes very well for what it is, a sports sedan, the tune numbers sound good but the real life seat of the pants feel difference does not justify the asking price IMHO.
#76
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I'm inclined to agree as my other car is a 1000+ hp HEMI. Even though my tuner says the XFR is now 475 ATW it does not feel any different. My tune is with Viezu, plus the pulley. Ridiculous as it may sound to you all but I would probably need another 100+ hp out of the XFR to be content and I'm sure to achieve that it would be expensive. So its a great car stock and if I was to want more from the XFR I would go to a serious tuning shop and put together a plan as do the serious tuning shops for the big 3 German marques.
#77
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I'm puzzled as to why some of you had the desire to buy and modify other higher power cars at great expense feel a $1700 or $2000 power upgrade isn't exceptional value. Those who buy the S/C models pay a huge premium for a 85-125 hp increase (470 or 510 from 385), so how is another 90-130 hp increase for $2000 expensive?
Whether you're happy with 385 or 510 hp for daily use on the street, or get your thrills with monster power in a car you almost never drive, it doesn't make sense to discount the value of these power increases for those you are interested in it. Some want more power in a car they can drive anywhere and anytime for a variety of reasons, and often just to brag to their buddies, and may not even care about how much of a difference they "feel". Those who drag race or track their cars will definitely notice the difference.
Bruce
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edobernig (06-20-2012)
#79
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The XKR-S is 550 hp, and the 510 hp XKR can be raised to 550+ with the ECU tune only, and to ~600 hp with ECU tune plus a pulley upgrade. BigCat09 has just shown this higher power level in his thread yesterday.
I'm puzzled as to why some of you had the desire to buy and modify other higher power cars at great expense feel a $1700 or $2000 power upgrade isn't exceptional value. Those who buy the S/C models pay a huge premium for a 85-125 hp increase (470 or 510 from 385), so how is another 90-130 hp increase for $2000 expensive?
Whether you're happy with 385 or 510 hp for daily use on the street, or get your thrills with monster power in a car you almost never drive, it doesn't make sense to discount the value of these power increases for those you are interested in it. Some want more power in a car they can drive anywhere and anytime for a variety of reasons, and often just to brag to their buddies, and may not even care about how much of a difference they "feel". Those who drag race or track their cars will definitely notice the difference.
Bruce
I'm puzzled as to why some of you had the desire to buy and modify other higher power cars at great expense feel a $1700 or $2000 power upgrade isn't exceptional value. Those who buy the S/C models pay a huge premium for a 85-125 hp increase (470 or 510 from 385), so how is another 90-130 hp increase for $2000 expensive?
Whether you're happy with 385 or 510 hp for daily use on the street, or get your thrills with monster power in a car you almost never drive, it doesn't make sense to discount the value of these power increases for those you are interested in it. Some want more power in a car they can drive anywhere and anytime for a variety of reasons, and often just to brag to their buddies, and may not even care about how much of a difference they "feel". Those who drag race or track their cars will definitely notice the difference.
Bruce
Now I know many will say that if I am nit picking the XF interior how could I possibly buy a C6 Corvette with its chintzy interior. Well the Z06 is the best bang for the buck out there and it makes no pretense of being a fancy car, just an awesome sports car, who cares if the interior is plasticky when the pedal on the right controls the mighty LS7 engine.
My 2 cents.
Last edited by 09XFSuper; 06-20-2012 at 02:06 PM.
#80
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Well I get the part about some of you not feeling the desire for more power in your XF because it's just a sports sedan, or because you'd measure it's value by the perceived visceral kick in the butt...or even how someone else peceives it. But there's a little more than that involved here.
Those of you that are focused on the difference in "feel" are really missing the point. What you're craving and responding to is a decent bump in low and mid-range torque. When you stab the pedal you want to feel like you're being pushed back into the seat. You want to smoke that kid in the Mustang at the light. That's what you get with a 5L, and adding a S/C adds a lot more of the grunt you love...and the ECU flash adds a little more.
But that's not what makes a car fast in the 1/4 mile, or around a road course. For that you need horsepower, and the more you have at higher rpm the faster the car. Lots of very fast cars don't have a lot of low and mid-range torque, and "feel" rather slow because of it, but they've been designed to retain more of that torque to redline, and by doing so make high horsepower and accelerate surprisingly quickly. BigCat09's ECU flash and pulley gained him only 25 ft-lbs of torque in the mid-range, not nearly enough to light his *** on fire, but he gained 65 wheel horsepower in the high rpm band that he'll use and appreciate at the drag strip, and that I'd use frequently lapping at race tracks.
I think some who have had these tunes done were expecting the car to" feel" faster, but instead they got a car that "is" faster and their daily driving doesn't recognize the difference. Fortunately the dyno tells the tale a lot better than relying on your butt...or somebody else's.![Icon Wink](https://www.jaguarforums.com/forum/images/smilies/icon_wink.gif)
Let me know if anyone is fuzzy on the difference between torque and horsepower, or why horsepower wins the race every time. It's not a very intuitive concept, but it makes perfect sense once explained.
Bruce
Those of you that are focused on the difference in "feel" are really missing the point. What you're craving and responding to is a decent bump in low and mid-range torque. When you stab the pedal you want to feel like you're being pushed back into the seat. You want to smoke that kid in the Mustang at the light. That's what you get with a 5L, and adding a S/C adds a lot more of the grunt you love...and the ECU flash adds a little more.
But that's not what makes a car fast in the 1/4 mile, or around a road course. For that you need horsepower, and the more you have at higher rpm the faster the car. Lots of very fast cars don't have a lot of low and mid-range torque, and "feel" rather slow because of it, but they've been designed to retain more of that torque to redline, and by doing so make high horsepower and accelerate surprisingly quickly. BigCat09's ECU flash and pulley gained him only 25 ft-lbs of torque in the mid-range, not nearly enough to light his *** on fire, but he gained 65 wheel horsepower in the high rpm band that he'll use and appreciate at the drag strip, and that I'd use frequently lapping at race tracks.
I think some who have had these tunes done were expecting the car to" feel" faster, but instead they got a car that "is" faster and their daily driving doesn't recognize the difference. Fortunately the dyno tells the tale a lot better than relying on your butt...or somebody else's.
![Icon Wink](https://www.jaguarforums.com/forum/images/smilies/icon_wink.gif)
Let me know if anyone is fuzzy on the difference between torque and horsepower, or why horsepower wins the race every time. It's not a very intuitive concept, but it makes perfect sense once explained.
Bruce