Gearbox tuning and any differnce between the svr shift speed and 5.0 S and R

I saw on Paramount-performances web site that you can now get your gearbox tuned. Has anybody tried this? If so are you happy with the results? Is the car still smooth to drive normally or has the remap affected this?
Is there any difference in the gear shift time between the standard 5.0 S, R and SVR?

Thanks Vince

 

Checkout this thread .... https://www.jaguarforums.com/forum/f...ng-tcu-236316/

 

I believe exactly zero people have had their gearbox remapped here. I would hold out for VAP to do some additional testing/development with their product and wait for their detailed results. IMO, much better information than anything you'll get from Paramount.

 

What are you trying to gain with gearbox remap?

 

Quicker shifts giving faster acceleration. Audi and VW seem to have very quick acceleration times for the power and torque of the car, so i can only assume their advantage is from the gear shift times?

 

While it might be theoretically possible, you will need precision timing equipment to detect the difference.

This is due to engine performance and gear ratios.

I don't think so. If your goal is to have a quicker car, first step is to upgrade tires to something with more grip (e.g. Michelin Pilot 4S) and the next step is to tune engine.

To me, gearbox tuning is like tuning window lifters. Sure, it will do something, but not going to noticeably improve how your car drives on the street.

 

One of the biggest disadvantages of the F-type's OEM calibration is how poor it launches off the line compared to similar AWD platforms. If VAPs combination of ECM and TCM software upgrades can adjust these parameters, the benefits will be very real and very noticeable.

When VAP does their real world testing, they'll be able to give us numbers. Don't let the Debbie Downer's of the world discourage your hopes and dreams.

 

We are looking at Wednesday/Thursday this week for some concrete results. We have a contract with the town we are based in to rent the airport runway and should have it booked for those dates to video and get Dragy data.

 

Hi Stuart,
regarding the Jaguar F type gearbox mappong . I have a 2018 F Type 5.0 SVR. Is the SVR mapping different from the 5.0 R and S? Are the gear changes quicker? Which car are you testing? Thanks Vince

 

The transmissions and tunes are exactlly the same for all v8s, now the v6 thats probably different

 

I remapped the TCM last year. It certainly shifts much faster as you can see on this video BUT you also stress the driveline more. On a 0-60 you may get a 0.07 seconds improvement.

 

Stock can be a little slow to kickdown IMO, although it is miles better than the 6 speed ZF - in fact the transmission was the biggest improvement I noticed from the XKR to the F Type.

But I'm not sure that I'd be all that comfortable fiddling with the tranny, it could end up being a massive PITA.

 

It is. Different people give different meaning to remapping the transmission. Many think that it simply changes the shift points (RPM and load dependant). The best way to "tune" the transmission is to push the shift timing (still twice as slow as a dual clutch even in the most aggressive setting). Then you will want to data log hard accelerations in each and every gear independently without causing a kickdown. Once you graph the speed vs elapsed time in each gear you can come up with the best shift rpm for each gear. In the end you will want to keep those ideal shift points that provide the fastest acceleration in mind and shift manually (paddles or stick)

The impact on all drivetrain components is significant and not ideal for the casual every day reliable driver.

 

What kind of hardware failures have you seen in your racing cars? In a manual gearbox faster shifting is harder shifting, does the same concept applies to ZF automatic gearbox?

We are still talking fraction of a second. Unless you are competing at a drag strip, how much of difference would that make?

 

The differentials are always delicate.and prone to failure, more so with the harder shifting tuning. The engine mounts are also rather weak and they fail like clockwork. In the ZF autos, it is critical to keep an eye on the fluid temp. It quickly jumps up with a few launches. On our custom cars, we switch the transmissions with the 8HP90. The clutches etc are far more robust. If I was to do it again, I would probably go with the 8HP75 (it's a step up with torque rating but it's partially redesigned and known as 8HP Gen 2)

I must say that the difference is so minute that it's really not worth it unless one is seeking the very last fraction of a second around the lap. If one is to use the F-Type to compete, I would skip the manual transmission, especially because of the weak clutch. With the ZF Auto, you would always manually shift, so doing your legwork to determine the fastest shift points (and they are not redline...) you would maximize your performance. Again, if this was just my normal every day car, I would not do it. Financially, it's just a very bad idea considering the fact that the only benefit is "butt dyno satisfaction" that will not equate to real measurable differences that justify the future repairs. I understand all of the hype for this "novelty", I have tinkered with it for almost two years. It's not worth it except to make some quick cash.

 

Long story short, if you're stock or near stock it's not worth it. The Paramount tune has decreased shift times and also increased torque limits. The second part is helpful if you're going to go full bolt on mods on the motor and I've noticed that it helps to keep the motor from backing off due to the TCU telling the ECU to back off a bit. Will it cause more stress on the driveline? Of course it does, any performance mod will. I will say that Jag did a great job on the trans from the get go, and the biggest reason to get this for me was that I was bumping up to the stock transmission torque limits (which are very close to the stock numbers oddly enough). It's worth mentioning that my R is AWD and the torque is much better in the mid to high end from what I've been able to gather. I'm going to the track this weekend in hopes to gather more data. A friend with an RWD R has recent gotten his TCU tune installed as well and he's been having problems getting the power down with PS4S on a fully prepped track now due to the torque coming in so strong. Also keep in mind, this isn't like the ECU tunes with the little handheld.... You need a laptop to attach to the dongle that you are sent.