I took my completely stock 2016 F Type R to the dragstrip for the first time last night. I was very pleased with the ET results, but I was a little disappointed in my trap speed. My first pass (car #212) was a 11.706 @ 119.56. The second pass was 11.590 but only 118.43 for speed. I was up 0.8 mph at the 1/8 mile mark on the second pass, but the top-end speed dropped off. Is this the ECU pulling power to protect the cats?

A couple of questions after my first outing:
1. Is there anything that can be done with a completely stock car to combat the ECU reducing power (if that is what was going on)?
2. What is the best way to cool this car down between runs? On my previous cars, I could turn the ignition on (but engine off) and the A/C on and the engine fan would run and I could also turn the temp up to pull heat out through the heater core. I would do this for a few minutes, then run the car briefly to circulate the coolant, then turn off and repeat the process. This was pretty effective for cooling the car down between runs. I have not found a way to turn the engine fan on with the F Type. Am I missing something? Any other suggestions for cool down?

 

120 mph traps for a 3800+ pound car is nothing to sneeze at.

To cool down you can ice your heat exchangers, put a bag on top the SC cover maybe.

A solution I am working on right now is divorcing the SC coolant system from the engine coolant system and adding a second exchanger and upgraded pump. This gives the SC awic's two big heat exchangers and a couple extra liters of coolant, which should really make a difference. This can be done for around $400. Considering an upgraded HX replacement is $750 and wont give the results of this setup I think it's a good plan.

 

That is a great 60' time. The benefits of AWD!

According to the date/time on the slips you had two hours between run. Was that not long enough to cool the car down?

 

What you are really trying to cool down to prevent timing from pulling (to prevent knock), is the INTAKE AIR Temps. Worst thing you can do is run a hot lap and then stop the car and let it sit...Especially with the hood/bonnet closed. You basically create a ton of extra heat, and then stop the car so EVERYTHING gets hotter. Without adding anything, the best solution between runs is too continue to drive the car modestly, so the cooling system can do its job...nice easy driving around for some airflow over the engine and IC's.

I have done that for many 1/2 mile airstrip shootouts in my 911 TT and F-Type and it is much cooler that way, than when I stop them and let them sit.

Doc OC's suggestion is a good one if you want to modify it, and also upgraded IC's or Water/Methanol Injection will cool it down (Even during a pull).

DC

 

Thanks for the replies. I did let the car sit close to 2 hours between runs. I parked in the shade, raised the hood, and ran the car briefly every 20 minutes or so to circulate the coolant. Ambient temp was around 70 F. I would really like to figure out how to force the engine cooling fan on without the engine running to help pull heat out of the radiator and circulate air in the engine compartment. Even after sitting for 2 hours with the hood up, the intake was still reading over 100 F. Has anyone tried ice on the intake plenum? I'm hesitant to try that due to potential thermal shock, but it may be my best option to pull heat out of the IC coolant.

Longer term, Doc Oc's suggestion of divorcing the coolant circuits and adding a larger SC IC heat exchanger seems like a good approach. Water/meth injection would be useful for drag racing, but I'm not sure that is practical for track days, which I am also planning to do occasionally.

 

The heat exchanger addition seems like an easy mod too. There is a single hose that connects the two systems (the top hose on the SC hx) which I'm going to cap off on the engine side and add a small reservoir to on the SC side. That'll allow for bleeding off pressure and topping off the system just like that connection was intended for. The new HX is going to go between the pump and the awic's utilizing all the factory lines. This keeps extra plumbing at a minimum and will also help remove some of the extra heat the pump adds as right now coolant goes straight from the pump to the awic's. Should have the project complete in a couple weeks and will post pics/results.

 

You can do that with the Jaguar diagnostic system so if you have a suitably equipped laptop you could plug that in and tell the fan to run at full speed.