An excellent write up from Evo.
Jaguar F-type review - prices, specs and 0-60 time | Evo
There's a pull down on the page for other information about the car.

 

There is one thing I have noticed in almost every test I have read, and that is this (quoted from Evos write up):

"Meanwhile the supercharged V8 has such a surfeit of power that it will happily overwhelm the rear tyres at the driver’s slightest bidding on the exit of a corner. It feels slightly heavier on the way into corners with the extra weight in the nose, so a slow in, fast out approach will yield the most satisfying results."

But is this correct? Is the extra weight of the V8 vs the V6 in the front? I thought the V6 and V8 was made out of the same engine block and had more or less the same weight? I would think the extra weight mostly came from larger brakes (front AND rear), different rear driveline/differential (more weight to the rear?) and maybe some heavier wheel suspension (also both front AND rear)?

I did put my (rwd) R on a weight as several of you have done - see this thread:

https://www.jaguarforums.com/forum/f...hassle-161094/

I also weighted both front and rear axel weight and the distribution was front/rear: 52.7/47.3 % with me in the car and with ~ 45 litre in the tank.

Has anyone done a test of the weight distribution on a V6?


I would think that it is the AWD (6 and 8) that are the models with some added weight at the front due to the extra front differential, so to compare it must be between rwd 6 & 8 and awd 6 & 8.

 

As measured by Autoweek:


"The AWD package adds 175 pounds and alters the F-Type’s weight distribution slightly -- to 49 percent front, 50 rear, from 48/52 for rear-drive, according to Tite.

Read more: 2016 Jaguar F-Type manual transmission review, test drive, specs, price and photo gallery"


Obviously the weight is skewed heavily towards the rear on the RWD V6, giving it a much lighter turn-in feel.

 

I don't trust these given figures. If they are correct it means that the V6 engine is a lot lighter than the V8 even though they are made from the same engine block.

The article in autoweek also claim the weight of the V6 to be 3455 lbs....which we know it is not.

Not shure what the difference in weight is between the manual vs automatic transmission though?

I would have liked to see the true weight distribution on a V6 comfirmed by a "true" test on a weight as we know that the claimed figures are not very accurate....

 

I've driven both the V6S and R (both AWD) on a short autocross track for a few laps and the R definitely felt heavier during turn in. Don't know why, just know it is what I felt and the other gentleman there with me felt the same thing. We both felt the V6S would be better on a tighter road and is the better canyon car.

Now all you R drivers, please don't take that to mean I feel it is a better car. It just felt better/easier for that type of driving. I also drove the 380hp XE for a long weekend and it was awesome on those types of roads. That being said, I took my modified XFR through one of the same sections of road and averaged a quicker speed, but it was a LOT more work and less fun. Satisfying yes, just not so much fun. And on sweepers or straights, the V6 is not anywhere close to as fun.

So now that I've offended both camps...I'll move on.

 

I am not offended at all, and I know that all reviews concludes that the V8 feels heavier during turn in - and everyone says it is because the R is more front heavy.
I am convinced that the V8 does feel heavier during turn in, but I am curious to why as I am not shure that the weight distribution is that different (that the V8 engine is that much heavier than the V6, since they are made from the same engine block).


I am just curious to this weight "issue" and would like to know what the facts are - specificly what is the weight differense between a V6 and V8 engine, and what the true weight distribution is on the two different models (and if it is not caused by difference in engine weight, what is it then?)

 

Having driven both the V8 rear wheel only and the V8 AWD I've always felt it was more about the torque difference and over/under steer. I've always slowed into the corner and accelerate hard out of it with my rear wheel V8. With the AWD it was different. The V6 seems to be the same way.

 

Weight distribution is only loosely correlated with turn performance (eg this). Even if the v6 and v8 had similar weight distributions -- which they don't -- the turn performance could be pretty different because of the effect of the extra weight on the suspension.

The V6 may actually be less weight balanced than the V8 but still feel better in turns for reasons outlined in that linked article. Feel is obviously also different from performance, so in case V8 owners feel slighted by this I'll point out that the V8 would still handily outperform the V6 on tracks.

 

I don't see how this is possible.

The 6 has a bore of 84.5mm.

The 8 has two more cylinders and a bigger bore of 92.5mm.

That's a heck of a lot more metal drilled out of the block.

The two extra pistons would weigh much less than the solid metal removed from the block.

The crank shaft may be slightly lighter but not by much.

If it was the same block I would think the 6 would be heavier.

 

They are made out of the same block, and that's exactly why I don't understand why the 6 is lighter in the front than the 8?
I also know that they have taken out some of the "extra" metal from the 6, but still...

 

The blocks share similar external dimensions to promote modularity, which allows more use of common design and components across the F-Type range.

But, this doesn't mean they weigh anywhere close to the same. Most of the engine block is air, nor metal. So conceptually it's not that one starts with a solid block of aluminum and drills (or casts) holes in it...it's kind of the opposite:
One starts with the displacement and cylinder geometry and then figures out what the minimum amount of structural metal needs to go around everything to make the engine work.

Otherwise it'd be a waste of expensive aluminum and unnecessary weight.

So the V6 doesn't contain all the weight of the V8 with two cylinders full of metal. It just contains less metal, period, because less is needed to structurally support the V6 powerplant.

Here's a side-by-side rendering of the AJ126 (V6) and AJ133 (V8) engines where you can see the difference in metal content:

 

I have read that using the same block is adding about 50 lbs of wasted weight to the V6 over comparable competing V6 engines. The weight savings over the V8 may be due to lighter suspension and drive-line components. Perhaps springs, shafts, knuckles, etc.? Whatever it is, it adds up to about 170 lbs. (RWD to RWD).

 

Hmmm...
When my over-stressed V6 twists itself into a pretzel, dropping in an over-stressed V8 shouldn't be that difficult. Oh, wait...the tranny! Note to self: call Tremec on Monday. lol

 

We're slouching our way back to the Ford DEW platform...maybe you can just drop a new shell on it and get a Thunderbird :-)

 

Is the supercharger on the six significantly different than on the eight?

 

The V8 has an Eaton TVS R1900. The one on the V6 is an Eaton TVS R1320. Yes, significantly different.

 

That's what I thought. What would the weight difference be between the two? Significant, or am I incorrect that this could be a factor in the differing weights?

 

Good point! The R1900 is 125 lbs where the R1320 is only 85 lbs.

 

Thats 40 lbs extra at the front which should be noticable, so good thinking .