Pulley & Tune @ Eurocharged
#22
#24
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The reason is, HP is a byproduct of Torque and RPM, as in:
HP = (Torque x RPM)/ 5252 (constant).
So when RPM = 5252, you have a brief moment where HP = Torque, hence they overlap at that one spot (5252rpm on the plot).
What is even more perplexing is the before and after dyno, have the curves intercepting at different RPMs and neither one is 5252.
Before Dyno: ~5900rpm
After Dyno: ~6100rpm
The only reason is some dynos have a calibration feature that allows you determine your tach signal (RPM) with out actually tapping a coil or the specific tach signal on the vehicle, the shop simply goes through a calibration process with vehicle in the specified gear, and based on the speed of the roller(s) the dyno operator has to target a specific rpm and the dyno itself is set into a learning calibration mode, to gather they rpm of the engine.
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2010 Kyanite XFR (01-12-2014)
#26
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I know there has been a lot of discussion on these boards related to ECU tunes and the various vendors offering them, so I thought I would relay my experience as well. I took my 2010 XF Supercharged to Eurocharged just outside DC today. Overall, a very good experience and impressive results. I had the pulley installed and ecu tuned. Jerry from their Houston shop was in town and did the tune. I will post the dyno sheets below (not sure how I left without the before and after pulls on the same sheet, but you will be able to see the results between the two sheets). In short, the best stock dyno runs showed 393 rwhp and 378 rwtq. The best post-pulley and tune dyno run showed 515rwhp and 476 rwtq. Overall, a very impressive improvement and very noticeable on the road. The first attachment shows two baseline pulls and the second attachment shows two post-tune pulls. Hope this information is helpful to those who are considering this mod.
#27
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In my opinion, if the calibration is off then the whole run is off. Whether that's representative of higher numbers? I don't know.
#28
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The scale is different on each side of the graph, that's why they don't intersect at the 5250 point. However if the scale was the same on each side they would.
For example both tq and hp curves make the same numbers at 5250 rpm but because of the difference in scale they don't meet at that point on the graph.
If they rescaled it to make the graph match numbers on both sides then it appears it would intersect at the proper point.
For example both tq and hp curves make the same numbers at 5250 rpm but because of the difference in scale they don't meet at that point on the graph.
If they rescaled it to make the graph match numbers on both sides then it appears it would intersect at the proper point.
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2010 Kyanite XFR (01-13-2014)
#29
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Thanks, Matt. I think you are right on the chart explanation. When you compare the scales on their respective sides to torque and hp, they appear to line up at 5252 (or as close as I can tell at around 455hp/tq @5250). On a couple other points raised in other posts: the drop off in the torque curve appears to be right in line with the stock dyno run (the tail at the end of the post-tune run is probably as they were laying off the gas close to the redline - I think it's after the shift point regardless, so it shouldn't matter). In any event, I'll leave that to others to determine whether it is an acceptable drop off. As for cost, Eurocharged charges $1000 for the pulley and tune (they ran a black Friday special back in November, which is when I actually purchased mine). The install for the pulley was about $240, which is a little more than than they charge for other pulley installs because the Jag pulleys are such a pain in the rear to remove.
#30
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2000, 25lb, 30, dyno, euro, eurocharged, installation, jaguar, pulley, review, sc, style, supercharged, xf, xjr
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