I did not know that the red line changes when the vehicle is place in Dynamic Mode and I've had it for just under a year. I also don't understand how that is possible. It would seem that an engine would have a maximum RPM rate pure and simple.
Also unknown is whether or not my 2018 V-6 did the same.
On well, learn something new every day.

 

The redline is capable of being adjusted/tuned. Velocity AP for example offers a TCU tune option that one of the adjusted parameters includes increasing the redline by 500 RPM to 7k. You can have them adjust it differently if you'd like as well. In reality, auto manufacturers place safe limits on the transmission's ability to shift to protect itself from harm. There have been occasions where I have seen people bouncing off the rev limiter, however the ZF transmission in our cars (similar to many other makes and models) has a long history of being able to be tuned well beyond what Jaguar sets the redline at.

 

Funny coincidence that 500 RPM is exactly how much the red line changes from normal to Dynamic driving modes.
But, thank you for your condescending reply.

 

Huh? Have I missed something?

 

I guess I am confused exactly how my response was received as condescending? I meant it nothing more than informative.

 

Skizot’s reply was perfectly logical and informative and not the least bit condescending. Perhaps SassySarah misread it?

This forum and the others on Jaguar Forums generally provide generous and informative responses to questioners…but often the questioners, having received a response or several responses, just disappear. I hope that won’t be the case here.

 

has to be a misunderstanding. What Skizot wrote was well stated!

 

Absolutely agree..... I thought Skizot's response was great and informative.....

 

Let's get just a little technical. Redline has traditionally been a number that is intended to be a safe limit for engine RPM. However, if we really get down to it, boosted, direct injection engines often have artificially low redlines due to the flow limits of the injectors at high RPM, and not of the connecting rods. (Let's ignore valve float as we really don't have a problem with that on quality 4 valve engines running today's redlines) Piston speed is typically kept between 70 and 80 feet per second at redline or 4200-4800 FPM. These are considered safe with quality internals. So, if we are making a new design, we can simply go with the tried and true 4500 FPM as a good starting point.

Using a quick online calculator, we can see that the AJ126 engine's 3.5 inch stroke gives a nice comfortable piston speed of 4083 FPM at 7000 RPM. The V8's 93 mm 3.66 in stroke give a piston speed of 4272 FPM. Clearly lots of headroom there. Being boosted engines, the connecting rods must be robust enough to withstand the force. So that's not likely a weak link.

Let's use 80FPS or 4800 FPM as our upper limit. V8 Redline could safely be 7850 with high quality internals. And the V6 could wrap up to 8200 RPM.

By way of comparison, there are just a few engines with nearly 5000 FPM redlines. The Honda S2000 2.0L and the Audi 5.2L V10 with it's 8700 RPM redline

 

Yeah, not seeing the condescending part either…Perhaps you misread or something….

 

I took it as a straight informational answer as well??? I saw no condescension...Oh well.

...And I have the TCU and ECU tuned with the elevated Redline...Great add..

DC

 

Username checks out.

 

User location checks out.....

 

I suppose changing the redline is possible with the electronic dash. I didn't realize that the mode changed it since I've got the old instruments (and a 6MT). Interesting.

There are really two notions of "redline." One is the recommended maximum rpm, the other is the actual rev limiter. I don't think the latter would be affected by the mode, but maybe. It's all software.

 

What a weird way to say “thanks” to a super informative reply.

As a former MT owner, I never noticed. Looking forward to playing with the new auto a little bit more now.