This past weekend, I had the pleasure of meeting with user '2010 Kyanite XFR' and user 'Bigg Will'. We met at Auto Club Dragway in Fontana, CA on May 14th, 2015. Although our main purpose was to enjoy ourselves at the track, we were all curious as to what the performance difference would be from a virtually stock XFR (mine) to a heavily modified XFR (2010 Kyanite XFR). The results were as expected, however, the difference was much smaller than we had anticipated.

In short summary, the modified XFR belonging to user '2010 Kyanite XFR' is without question faster than my stock XFR. However, this power difference seems to really kick in when getting into the higher gears. There has been much debate on whether or not the TCU will inhibit power and make any tune useless and I think we can see the TCU limiters in action here. The extra power made by the modified XFR is not able to be fully utilized until gears 3 and above. Unfortunately, I was only able to get two of our races on film but the outcome was generally the same. If I was to match the launch of the modified XFR, this same car would start pulling away right around when we shift into third gear. As seen by the time slips, the modified car always had a few MPH trap speed advantage compared with my car.

It would be interesting to see these cars matched up on an airstrip run where the cars are raced from about 40mph to speeds north of 170mph. I think the power advantage would really come into play when the cars are running well into the triple digits.

Anyways, enjoy the attached photos and videos of the day. It was a great time!

 

Didn't realize you took video of me beating the Vette! Thanks! That's when I was experimenting with the 2nd gear launch and preloading the tranny at 1700 rpm. Looking forward to seeing which technique works better next time I go.

I'm not positive the TCU is the issue, but it still may be. It might also be the diff pulling power since I don't ever run the DSC completely off and the power comes on really hard after the tune and pulley. It might just be traction limited trying to get a heavy car out of the hole with street tires.

I'll post a couple of slips from the day soon.

 

Loved watching the Jags spanking the other marques!!!!

 

Yeah I was going to post this earlier but if you both switched to drag radials or slicks, Kyanites car would shred you out of the hole or from a roll. Neither if you had your TC completely disabled during the runs, and TC on this car is pretty intrusive even at stock power levels. This car was designed and tuned to be more a high speed Autobahn burner. Needs more traction to see what it is capable of in the lower gears. I don't know of anyone that's fitted DRs to these cars (someone must have by now)

 

From what I've seen, BigCat09 put drag radials and got to 11's. But he's the only one.

 

Good clues in the timeslips. your 60ft times are showing traction issues. However you and kyanite are making the same hp at the 1/8mi. Maybe he's 10hp more. There is again a slight hp advantage to ky with the 1/4mi trap speed.
little new info would be gained running above 120mph from a roll.
Drag radials might pick up a 10th on a good track.
Temps and baro press will affect you as well. Did you record the conditions?

 

I don't know if it was the track or the cars but launching with the DSC off blew the tires on the launch, and made for a squirrely trip through the 1/4. The best launch for me, 1st gear start, DSC on track, Dry short burn out, power brake to 1700 rpm, fast roll on the throttle. As far as my reaction time, I need to go fresh from sleep and not fresh from work as I did.

 

I'd love to see what I could run with a higher stall torque converter (3800rpm) and deeper gears (3.90 with the ZF 6speed). Kaynites pulley definitely is a mid range monster, I got one on order myself since mid ranger is perfect for the streets.

 

I knew you would get it. I'll give you GSR's info via text for install.

 

awesome videos!! Great to see you guys smokin' those guys -- I can't believe you all took down the vette and the M4 -- great job.

man i wish i lived in soCal to go out and play w/ you guys!

anyone in the DC area want to go and play like this!

 

Thanks for the credit but not sure what happened with the M4. He was sleeping for at the line or had an issue with the launch. The Vette was older but had work done, although Patrick said it was somehow slower than stock. So not so proud. Also raced a ZL-1 Camaro and he had a 3 second RT so not much of a race either. The racing between us was the closest. Kinda like spec racing.

 

I wouldn't exactly use the word "shred" to describe what might happen if we were running on slicks. Traction wasn't too big of an issue as I just soft launched and rolled into the throttle. As you can hear in the videos, the car hooked up rather well in first gear. Other than one or two instances of axle hop, I had zero wheelspin out of the box by rolling into the throttle. Also, I did have DSC completely disabled on all of the videos I posted. At no point was power being limited by the car due to wheelspin.

Due to running street tires, I was not able to go WOT right out of the box. My normal launch consisted of brake boosting to about 1700rpm, releasing the brake, and rolling into the throttle as fast as I could without overloading the traction abilities of the tires. As long as the tires didn't spin at the moment of launch, the car would hook up 100% through first gear.

I did. The average of all the data was a temperature of 64.5 F, 57% humidity, and barometer pressure of 30.05 in.

 

Patrick
I took your running conditions and plugged them in to my drag calculator. I have the Jag data from the XFR-S. It nailed my 1/4, 1/2, 1mi speeds and et's.

So using the data from the XFR-S, I gave the program the XFR weight, Fontana conditions, and then told it to take off a flat 50HP from the XFR-S.
This is the calculation for your car:
60' 2.06 38.75
330' 5.48 72.15
660' 8.22 91.65
1000' 10.69 104.26
1320' 12.69 113.71


That assumes zero wheelspin. Just looking at your timeslips this closely matches your performance. This also justifies that the XFR is about 50HP below the R-S. In actuality it's 40 but Fontana is at 1200ft which knocks down real HP another 10HP unfortunately.

Running Kyanite's numbers shows about 10HP over your power level under the same conditions. It appears there is a bit more gain than 10HP at the top end but that power is not there is the first 1/8th mile.

HTH

 

I will definitely have to give my running mate credit that he is better at launching the car. I feel he gets better 60' times even when down on power and I still get some wheelspin with the Trac-DSC. So I believe my car has more improvement left in it with me getting more practice. The newbie driver slowing it down...that and the 100 lb sub box in the trunk.

Actually, if you add 150-200lbs to my vehicle weight (sub box and 250lb driver with just under 3/4 of a tank - he had about 4 gal. less), what does it say?

 

And here's my best slip of the day. Not sure if that will change much but wanted to give you another set of data.

 

Kyanite. Any chance you were able to weigh the car? Right now I am putting weight numbers in from Jag's website. I can run various combos if you'll give me some more details.
Jag had posted detailed HP curves for the F type R but right now I have not found XFR hp curves.
The other problem is the simulator does not take into account trac control or tire spin.
personally I would like to do some chassis dyno runs and share with the community. Will post when that happens

 

Kyanite, another update. Can you tell I love this $hit? I ran your latest timeslip thru the calculator.
It seemed like your car is gaining HP above 5000 so I refactored the baseline engine power to add +15 lb-ft of torque anywhere above 4750 RPM. I also refactored the loss to 42HP below the stock R-S power. It's a lot of math gymnastics that I played but it shows your engine is making killer high-end power and still running stock-ish low-end power.
With all the refactoring and games this is what the quarter mile times looked like. Again, this has Fontana elevation and temps from the day you ran based on Patrick's input. I also have the weight with driver at 4400 lbs.
Here are the results:
60' 2.04 39.76
330' 5.39 73.66
660' 8.18 93.97
1000' 10.48 106.85
1320' 12.43 116.71

The engine curve refactored to SAE 60 degree looks like this for the calculated run:
RPM Torque HP
1000 338.5410264 64
2000 423.3606735 161
2280 442.5372894 192
2453.333333 458.0260945 214
2686.666667 476.4651483 244
2880 486.7910183 267
3000 491.2163912 281
3293.333333 497.1168884 312
3686.666667 501.5422613 352
4000 501.5422613 382
4300 498.5920127 408
4713.333333 504.0037048 452
4906.666667 500.315894 467
5000 500.315894 476
5173.333333 498.1032076 491
5666.666667 479.6641539 518
5906.666667 473.0260945 532
6000 470.8134081 538
6106.666667 470.0758459 547
6246.666667 464.1753487 552
6380 453.8494787 551
6480 447.2114193 552
6566.666667 442.7860464 554
6666.666667 442.7860464 562

Reality is you ran what you ran. You are probably making more HP than stock RS at peak power but possibly less at lower RPMs. HTH

 

That is my fault, I saw the time slips with DSC Trac noted and forgot there were three of you running. Pretty impressive launches with DSC Off, especially considering I have never had the nuts to turn TC completely off on my car (I'd give it a shot if I took it to the track)

Very cool math from Allenman. With a pulley and tune theoretically Kyanite's car should be making more power than a stock R-S. My unempirical guess for the difference is:
- Even with cooldowns between runs, the heat soak might be a bit more draining with the supercharger running harder. I would love to see more cooling products available for our platforms (like the Iceolator) or see someone run water / meth injection to counteract it.
- The tune might have the power band pushed too far to the right. I'm not sure how Jailbreak builds their tunes but a dyno + laptop + street tune might be the best way to get the most out of the pulley. I went through this process on my old STI and about 20 minutes of "post tuning" on the street helped shift the power band to the left and made it more fun for daily driving. There could also indeed be some TCU limitations; companies in the GM tuning world dive into the TCU tuning as well as the ECU.
Another thought here is that perhaps Jailbreak could write a race gas tune for C16, that would make a massive difference at the track without having to swap out to DRs or slicks.
- The weight does make a surprising difference. A lot of the guys in the Mustang community get pretty obsessive about weight loss at the track (setting up quick disconnects for sub boxes, removing spare tire + tools, running at 1/4 tank of gas at the track, etc.). Back in the day I had a friendly late night street run in my STI (on the pump gas tune @ 456whp) with a buddy's 300ish whp WRX. I had 3 other passengers, one of whom was probably 250lbs himself, and the WRX pulled a car or two on me to about 80mph.

 

Allenman, I have not weighed it. Thought the track would have a scale but they did not. I'll weight it some time in the future with me in it just to confirm. Not sure if you were on the forum when I was getting all my mods done. Here is a link to the thread.

https://www.jaguarforums.com/forum/x...x-pipe-111588/

I've also attached copies of my dyno runs and power charts from a Dynojet dyno, so I have a good idea of what's going on. I know that heat soak affected these runs to some extent and that the tune only was done with a mostly cold car. The stock and more modified were done after driving to the shop to do the run with a little cool off. I'm going to see if I can do another set of runs, but I want to try and ice the intercooler after getting there to put up a real representation of what it can do!

And I'm glad you enjoy this stuff. Makes it so I don't have to learn how.

 

Allenman, is your quarter time corrected? If not, what were the elevation, etc. for the run?