VividRacing, aka VR Tuned lists gains to 600 BHP / 550 LB-FT on the XFR with apparently stock everything:

https://www.vrtuned.com/tuned-ecu-fl...151888502.html

Peculiarly, they also list an ECU tune for the XF Supercharged, but they only list gains to 510 BHP:

https://www.vrtuned.com/tuned-ecu-fl...150842675.html

Shouldn't the peak ECU tunes be identical? Wasn't it well-established on these forums that the XF Supercharged and XFR have identical engines/intakes/exhausts, with the only difference being the ECU tune? Does it seem strange that the tuning technician left that much horsepower on the table for the XF Supercharged if he did such a good job on the XFR (assuming the same tech did it)? Or is it expected to be that much more difficult when starting with the XF's under-tuned engine?

After purchasing the device, they request you send them a copy of your ECU file, which they will then remap and send back to you. Is there any reason their 2012 XFR mapping wouldn't work on my 2012 XF Supercharged?

Disclaimer: This is my first post on this forum, but I have no affiliation with VR Tuned (or any automobile industry group).

Thanks!

 

I came across the VR tune as well as I started searching for tune/pulley options on the XFR. I have a hard time believing their claims, they don't post any dyno data and no one on the forums has ever talked about using this tune. The dyno graph they show on the site is auto generated based on their "estimates".

And a simple google search revealed many other forums pointing to VR tunes as repackaged, overestimated, and unverified junk. We have many other good proven choices and at cheaper prices than VR (VelocityAP, Eurocharged, etc). So I would never try or recommend anyone else to risk any money with this unproven product.

 

+1

There was a similar high HP claim on the F-type sub-forum from a tune only. Everyone said not to do it. Guy did it anyway, wrecked engine, warranty claim was denied.

Stick with the tried and true companies or you’ll be the next guy parting out their Jag. All the best.

 

I just wanna say VelocityAP also claims the same 600bhp for just the tune.

 

The consensus on the f-type forum was that 45-55 HP is reasonable for tune only. 100 HP will cause problems without hardware upgrades.

https://www.jaguarforums.com/forum/f...100-hp-178358/

 

No they do not. They claim that number with the Tune and Pulley package. And I remember them stating that only the Bosch ECU equipped cars are capable of 600+ hp. The Denso ECU cars are capable of 60+ WHP and 70+ WTQ.

The 100 hp increase is really for the 5.0 motors that were rated at 470 or 495 hp. As you go up the chain to 510, 550, or 575 hp, the hp increase from tune/pulley isn't as much.

 

Denso ones are capable of 600+ too. Tune/pulley/exhaust. 630hp Denso XFR is well know and this number isn't a limit actually. Denso is a bit tricky to tune (Bosch ones are easier/more common and lots of tuners have expirience on these PCMs on VAG/BMTroubleyou/whatever and these have a lot of common between brands), but once you'll got the idea - the only limit is an engine hardware.

 

From all the threads I have seen on the Denso ECUs, with pulley, exhaust, and tune, whether VAP or Eurocharged tuned, the power went from ~460 whp to ~520 whp. When you convert to crank, 510 hp becomes ~575 hp. Have you seen dyno reports that show otherwise? I have a denso ecu XFR, so I would love to get 600+ hp with a pulley and a tune. But, don’t want to overestimate the power gains.

 

Quite a old dyno (there's a lot of room for improvements over that tune)
https://a.d-cd.net/ed36e4as-960.jpg
556.2 rwhp
Mine is booked for a dyno next week, but i don't have a stock dyno and there's too much mods on mine (aluminium intake, decat/downpipes, x-pipe, straight-through mufflers, upper pulley, modified supercharger bypass valve and so on).
Anyway, a XKR with less than 600+ hp wouldn't make a 121.14mph trap speed on a 1/4mile, right?

 

Interested to know more about this

 

Holy WOW, that WTQ number is insane!! This output is just from the exhaust, upper pulley and tune? What tune is this?

 

This is output from a tune/intake/exhaust alone.
This dyno was made on a tune by a vs-perfomance, however this tune is not perfect:
-it is still pig rich - 9.5:1 (im running 11.5:1 on mine)
-there's some mistakes, so the boost is still limited to 11.6psi (i'm running 14.4psi of boost)
-they didn't touched a bypass valve.

so there's more power hidden in denso units than shown on a dyno

 

It was modified since with custom intake, custom exhaust and a decat the vacuum diagram of engine drifted away from a stock, so the butterfly wasn't closing fully. So it was an adjustment. Also, now a butterfly closes eariler, giving a benefits of full boost at lower rpms. It's worthless to modify it without hardware mods to engine and a remap (or the PCM won't allow to build up a boost)

 

Got it - makes sense. Thanks for the explanation! I'm now a good 3k miles since my rebuild so ready to look at crank pulley, headers, tune, etc

 

oh boy - eagerly awaiting these posts!! go get em!

 

I know a unverified XFR V.1 Denso car that made 607RWHP and 563TQ. It has; Lower supercharger pulley, upper supercharger pulley, custom engine tune, headers and full exhaust, methanol injection, upgraded intercooler, cooling custom air intake to support the airflow made 607whp/563wtq The ardent headers and meth injection are the real difference here. https://ardent-performance.com/colle...exhaust-header

Here is a vid of how the car sounds. I asked him to post it here.

 

I've made a 669hp/750Nm(553lbft) with a tune and sport cats alone https://a.d-cd.net/nWAAAgGB7-A-960.jpg
Add a dual pulleys and x-pipe and theres 683hp/850nm(626lbft) https://a.d-cd.net/UUAAAgC0n-A-1920.jpg

 

Impressive! Any videos of this monster?