Remapping Question
#1
07-10-2016, 10:38 AM
Remapping Question
I have done quite a bit of research on performance mods for my 2005 XJR.
As others have pointed out not a lot of choices.
I did get my supercharger rebuilt along with the small pulley,2.6 Eurotoys, as well as some other less significant mods to the SC.
I was expecting some noticeable performance increase. I did "feel" some difference but not as much as expected.
My SC is on its way back to the company that did the work on it because of noise that concerns me.
When speaking to the owner he asked me whether I felt the performance difference and I said what I stated above.
He said that I needed to get a remap done.
That kinda annoyed me.
So questions:
1. Should I expect a significant difference with a 2.6 pulley?
2. Would remapping with the standard pulley make a noticeable difference?
3. Would remapping with 2.6 pulley make a noticeable difference?
4. Who does remapping on a 2005 XJR?
5.Anyone done the remap on a 2004/5/6/7/8/9 XJR?
As others have pointed out not a lot of choices.
I did get my supercharger rebuilt along with the small pulley,2.6 Eurotoys, as well as some other less significant mods to the SC.
I was expecting some noticeable performance increase. I did "feel" some difference but not as much as expected.
My SC is on its way back to the company that did the work on it because of noise that concerns me.
When speaking to the owner he asked me whether I felt the performance difference and I said what I stated above.
He said that I needed to get a remap done.
That kinda annoyed me.
So questions:
1. Should I expect a significant difference with a 2.6 pulley?
2. Would remapping with the standard pulley make a noticeable difference?
3. Would remapping with 2.6 pulley make a noticeable difference?
4. Who does remapping on a 2005 XJR?
5.Anyone done the remap on a 2004/5/6/7/8/9 XJR?
#2
07-10-2016, 02:36 PM
Unless you go a twinscrew you probably wont see much
What you will feel is more likely going to be shifting the torque curve
The S/C issue is more a limit on boost and temp
With the standard pulley the S/C is driven hard but with the upgraded pulley its overdriven
The result is it maxes out the boost about half way
So you get a lot more torque early but aboutthe same overall result at the top end
Also you put a lot more pressure on the coolers as the S/C is generating more heat
You can dance around the edges, tune, water/meth ect ect ect but the gains are small
The only big gain is to replace the S/C with a twin screw
If you like do a search in the Snowy Mountains 1000 thread
We both had near identical XJR's but one had a pulley and LSD. The other had cats done nut also a failing coil (replaced after the event)
The time over the 1km runway are not that different and definitely not due to a pulley upgrade
Cheers
34by151
What you will feel is more likely going to be shifting the torque curve
The S/C issue is more a limit on boost and temp
With the standard pulley the S/C is driven hard but with the upgraded pulley its overdriven
The result is it maxes out the boost about half way
So you get a lot more torque early but aboutthe same overall result at the top end
Also you put a lot more pressure on the coolers as the S/C is generating more heat
You can dance around the edges, tune, water/meth ect ect ect but the gains are small
The only big gain is to replace the S/C with a twin screw
If you like do a search in the Snowy Mountains 1000 thread
We both had near identical XJR's but one had a pulley and LSD. The other had cats done nut also a failing coil (replaced after the event)
The time over the 1km runway are not that different and definitely not due to a pulley upgrade
Cheers
34by151
The following users liked this post:
jackra_1 (07-10-2016)
#4
07-10-2016, 08:35 PM
Senior Member
#5
07-11-2016, 03:35 AM
I have Bridgestone Potenza RE9070AS tires on my car and on kick down I will get a quick chirp in the dry no spinning unless its wet.
#6
07-11-2016, 09:07 AM
Senior Member
#7
07-11-2016, 09:15 AM
Senior Member
Unless you go a twinscrew you probably wont see much
What you will feel is more likely going to be shifting the torque curve
The S/C issue is more a limit on boost and temp
With the standard pulley the S/C is driven hard but with the upgraded pulley its overdriven
The result is it maxes out the boost about half way
So you get a lot more torque early but aboutthe same overall result at the top end
Also you put a lot more pressure on the coolers as the S/C is generating more heat Methanol injection by itself is not a power adder. If there was a proper way to do hands on tuning via Diablo Intune or similar device and be able to delve into the computer and its parameters, it will give you a very significant WHP increase!
You can dance around the edges, tune, water/meth ect ect ect but the gains are small
The only big gain is to replace the S/C with a twin screw
If you like do a search in the Snowy Mountains 1000 thread
We both had near identical XJR's but one had a pulley and LSD. The other had cats done nut also a failing coil (replaced after the event)
The time over the 1km runway are not that different and definitely not due to a pulley upgrade
Cheers
34by151
What you will feel is more likely going to be shifting the torque curve
The S/C issue is more a limit on boost and temp
With the standard pulley the S/C is driven hard but with the upgraded pulley its overdriven
The result is it maxes out the boost about half way
So you get a lot more torque early but aboutthe same overall result at the top end
Also you put a lot more pressure on the coolers as the S/C is generating more heat Methanol injection by itself is not a power adder. If there was a proper way to do hands on tuning via Diablo Intune or similar device and be able to delve into the computer and its parameters, it will give you a very significant WHP increase!
You can dance around the edges, tune, water/meth ect ect ect but the gains are small
The only big gain is to replace the S/C with a twin screw
If you like do a search in the Snowy Mountains 1000 thread
We both had near identical XJR's but one had a pulley and LSD. The other had cats done nut also a failing coil (replaced after the event)
The time over the 1km runway are not that different and definitely not due to a pulley upgrade
Cheers
34by151
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#8
07-14-2016, 04:09 PM
Well my supercharger is on its way back to me after having a bearing that went bad replaced.
Sometime next week I, hopefully, will have everything back together. Also will have the upgraded IC pump properly installed.
Last year using a Passport Timer I did a run on a slightly uphill road 0-60 in 5.85 seconds. Thats with 3/4 tank of gas and toolboxes in the trunk. Temp was about 90 with high humidity.
Next week or the week after I will do another run on the same road.
#9
07-14-2016, 06:22 PM
#10
07-14-2016, 06:37 PM
Yep, our cars are in no-mans land when it comes to tunes. The regular tuning equipment (like KessV2) won't make tunes on our ECU's via the OBD port.
It's too hard for most people. The 2006-onward cars got a new software/electronics platform which is much easier to work with.
I have a custom tune in my XJR, and while it certainly picked up some low end power, the top end is pretty much the same as the stock tune. Running a smaller pulley limits how much you can get out of these engines in the top end anyhow.
I won't say these engines are maxxed out, but there's not much scope for gains unless you work on making the intake and the exhaust more efficient. And ironically the pulley's make the intake less efficient as overdriving the Eaton pushes it outside of it's efficiency curve...
The whine makes up for the lack of power though...
It's too hard for most people. The 2006-onward cars got a new software/electronics platform which is much easier to work with.
I have a custom tune in my XJR, and while it certainly picked up some low end power, the top end is pretty much the same as the stock tune. Running a smaller pulley limits how much you can get out of these engines in the top end anyhow.
I won't say these engines are maxxed out, but there's not much scope for gains unless you work on making the intake and the exhaust more efficient. And ironically the pulley's make the intake less efficient as overdriving the Eaton pushes it outside of it's efficiency curve...
The whine makes up for the lack of power though...
The following users liked this post:
jackra_1 (07-14-2016)
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