So Im a little ticked off! Slower 1/4mi with the tune
#1
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Last night went to Fontana Ca 1/4mi
My previous best run 7 month ago with no mods was 13.19
Yesterday with 1.5lb pulley and OE tuning Tune best runs were 13.29 104mph and 13.24 at 106mph
I always suspected that with the tune the top end seemed to be slightly lacking and I was right. After I took the tune off back to stock immediately got best run
13.16 at 107mph , another run 13.19 at 107mph. 60ft times were all similar at 2.0
This confirms my feeling that I was making less hp on top end with the tune.
My previous best run 7 month ago with no mods was 13.19
Yesterday with 1.5lb pulley and OE tuning Tune best runs were 13.29 104mph and 13.24 at 106mph
I always suspected that with the tune the top end seemed to be slightly lacking and I was right. After I took the tune off back to stock immediately got best run
13.16 at 107mph , another run 13.19 at 107mph. 60ft times were all similar at 2.0
This confirms my feeling that I was making less hp on top end with the tune.
Last edited by AlexJag; 11-21-2016 at 03:05 PM.
#4
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Im not one to bad mouth any company but the proof is right there the car runs slower with aftermarket generic tune
With the pulley upgrade and a tune he should be running into the 12s
With the pulley upgrade and a tune he should be running into the 12s
Last edited by steve_k_xk; 11-21-2016 at 01:20 PM.
#5
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We should call out vendors if what one stated is accurate/factual and not meant to demean. Just get the facts out there on one's experience for us all to learn.
#6
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I'm not into the tune stuff but if I were to get involved I would think you would need to collect the necessary data to make any comparisons. Info like track runs (maybe 5) to determine best/worse times and also a dyno run to set base line. Then do the dyno run after the mod and then the speed runs . Identify what was done and who did it and let the results speak for themselves. Granted the runs would be subjective to the skill of the driver but the dyno results are pretty much fixed.
#7
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My vehicle is only the n/a version ![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
Unfortunately the price difference in Australia was going to be a further 20k to land my backside into the xkr.
Having said all that i have a custom dyno tune and have recorded an official e.t of 13.9 (at the drags/terrible heat 90f) then an unofficial time of 13.7 with x-pipe on the gtech pro
![Frown](https://www.jaguarforums.com/forum/images/smilies/frown.gif)
Unfortunately the price difference in Australia was going to be a further 20k to land my backside into the xkr.
Having said all that i have a custom dyno tune and have recorded an official e.t of 13.9 (at the drags/terrible heat 90f) then an unofficial time of 13.7 with x-pipe on the gtech pro
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#8
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Im comparing back to back runs with same 2.0 60ft times. I always suspected and told the tuner that the car felt slower on top end, but I thought it was just in my head. Lower rpms felt more powerful with the tune.
The results confirm that instead of 30+ hp that the tuner claimed, Im actually making less hp on top end resulting in slower trap and 1/4mi times.
The results confirm that instead of 30+ hp that the tuner claimed, Im actually making less hp on top end resulting in slower trap and 1/4mi times.
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mosesbotbol (11-21-2016)
#11
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1/4mi time is faster with tune off vs on.
Last edited by AlexJag; 11-21-2016 at 03:00 PM.
#12
#15
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Maybe your right, the problem for me is finding the tuner who would do it. Originally I chose OE Tuning that got me the current tune, because they were pretty much the only company near me to also offer a dyno tune. After I found out they dont even have their own dyno machine, and I would need to pay extra for custom tuning as well renting a dyno machine...
#16
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Cee Jay (11-29-2016)
#18
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Yes Steve, and it appears only a handful of companies have the software and only one nearby which is OE tuning with the current tune.
Last edited by AlexJag; 11-29-2016 at 08:03 PM.
#19
#20
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AlexJag (11-29-2016)