Hey guys, I've had my 2015 Jaguar F-Type R on my DynoJet twice now and I have not been able to get a proper dyno run on this thing yet.

The problem seems to be that even if you start out the run in Dynamic and Manual mode it will soon realize the front wheels are not turning and it will kick you out of Dynamic mode locking you out of it until you remove it from the dyno and drive a few hundred feet again.

Running on the dyno in Standard and Manual mode would be okay were it not that the transmission will kick down gears when you mash the gas to do a run. In Standard mode it will not stay in the gear you have manually selected.

I have seen a few people here post that they have run their car on the dyno and others posting they tried but could not but nobody has yet an explanation on fixing the problem. It is possible as .

Any suggestions for defeating the kick down, if you did dyno your car did it stay in Dynamic mode?

 

We had that issue with Jeronstoys' car when it was being dyno'd. That's why the performance result chart starts at 4000 rpm (won't don't shift into 4th at that speed). We did not have that issue with my MT car.

 

Hmmmm...you did turn off the DSC (traction control) all the way?

 

Yep...part of every good dyno checklist. Doesn't prevent an F-Type AT from kicking down to the next lower gear when under full throttle.

 

At least with my XFR, which I've dynoed 5 or 6 times, the secret is to gradually put the pedal to the metal and not to flatten it quickly. As well as the other basics - Dynamic mode, Sport mode in 4th gear, and DSC completely turned off (hold the DSC button down for about 12 seconds).

 

The problem with that solution is that you want WOT output for the entirety of the engine speed spectrum. Otherwise output at the lower end is mostly a function of the throttle setting.

 

The kick down feature is a physical switch in the pedal. There's a click feeling when you hit it, and if you play with the pedal while the engine isn't running its pretty obvious. You should be able to push the pedal down to the point just before the switch (which takes increased effort to trigger) and still have wide open throttle. This will keep you in the gear you've selected.

 

Well I'll be . . . My first reaction was what are you talking about, it doesn't kick down when you're in sport/manual. So I tried it this morning (stomped it in 6th at 70), and yes it certainly does.

I drive in manual mode most of the time and always use the paddles to up- and downshift and am always in the right rpm band for speed and gear, so in 2 years, I'd never seen that before.

 

I'm fairly certain I mentioned this a while ago...

Some of the torque curves posted on here suggest that the transmission is out-foxing the dyno operator and shifting either as they plant the throttle or as they lift off.

 

Has anyone successfully disconnected this switch or moved it out of the way to use on the Dyno?

 

On the top of the the throttle pedal the connector is easily removable and if you traced which wires were the knockdown switch it should be easily disconnected. Anyways here are my runs for my experimenting tonight, to get these I just didn't push pedal into the knockdown switch. There is big discrepancy between runs but this is the closest to a proper run that I have been able to create so far.

 

Great info

 

Here is a video of a few of the runs.