Tom Lenthall ( Home - Tom Lenthall Ltd - Jaguar Land Rover Specialist ) is going to develop a new supercharger kit for our high-performance V8!

He told me he will be ready soon!

 

Exciting stuff!

 

Is this likely to clear a stock hood? It doesn't look that tall and is very attractive lol.

 

let them work and see what happens

 

my first thought as well. I'll keep an eye on development.

 

Wow! Very impressed by Tom and glad to see more supercharger upgrade options for this engine.

 

https://www.facebook.com/permalink.p...81172772031242

other photos ( also of the bonnet )

 

Very cool , looks impressive ! I like how it's cable TB .
That car will be an animal. And what better car to put it in .
Brilliant !

 

That model is a 2.9l, so the biggest supercharger I've seen yet on our engine. That car also has a 4.8 stroked engine and manual box so brilliant indeed!

 

As far as I am aware, he uses a 4.4 engine from RR (based on the Jag 4.2 engine), which has a wider bore of 88mm and isn't stroked.

Am curious how far he gets, the ingredients are there now so should go well, but as a side note, on street fuel there is still a limit of maximum boost, regardless of how big or small the supercharger is.

 

what is RR ? Rocketsports Racing USA ?

 

My Range Rover Sport has a supercharged 4.2. The normally aspirated ones (in 2006) came with a 4.4 litre V8. RR =Range Rover. They are both Jag designed engines AFAIK.

 

Nice article on the car here from a few years ago: Badcat Upgrades. Of course, but with a simple meth injection kit this should make more boost/power at the same pulley ratio as a 2.6KB and run cooler due to the larger displacement. Hence why KB had to make the 3.2 and larger units to compete in selling kits. He should also lose less power to the wheels compared to an auto so big power potential.

 

Maybe if you would compare similar supercharges, but I am talking about the KB 2.6H series (higher internal compression ratio, to be used for pressure ranges above 15psi), which has lower parasitic losses and generates less heat vs a standard KB 2.6. According to a KB dyno test between the 2.8 and 2.8H the latter made 56 more HP, and for the 2.8 to gain the same level it would take another 5 psi.

So here I wouldn’t be surprised the 2.6H will deliver more power to the wheels until 25 psi then the 2.9 Lysholm. It’s important to understand the pressure ranges you want to go for and engine size to determine what would be the most suited supercharger.

Not quite correct, as mentioned you need a supercharger sized right for your engine size, i.e. the 2.6H would be inadequate for higher pressures on let’s say 5.4, 6.0 and 7.0 liter engines, where a 3.2 or even a 4.7 ltr version would be better suited, so bigger isn’t always better. Considering KB’s recommendation, the 2.6 is very well sized for the 4.0/4.2 engines, maybe on my 4.8 ltr the 2.8H could give a slight advantage, but not worth the test.

Indeed I think so too, but only a couple of percentage points, not major numbers, though of course they add.


Bottom line, I am really looking forward to what he will build and to the results, pending on the amount of boost he goes for he could go past me, and if it isn’t badcat’s car there are others here that have interesting builds going on that maybe could overtake my results so far.

So I am very curious to all builds, and wish them all good luck as these are serious power levels where things can go wrong (where I’ve probably been lucky so far).

 

I think if you were to compare a 2.6H KB to a 2.9 Whipple at high boost, the Whipple would make more power as it seems to makes just less than the 2.8H with similar supporting mods on Mustangs.

I agree with different superchargers being suited/recommended for a chosen engine for street applications, but ultimately the bigger supercharger will make more power when pushing limits provided the inlet/TB/MAF is sufficient and there is enough fueling/strong enough engine. I've never read a KB tech article in which the smaller SC won a dyno shooutout.

Let's take the 5.0 Mustang GT for example. KB offers superchargers from 2.8 to 4.7 with increasing supercharger ratings from 725 to 1800rwhp depending on your intended usage - Mustang 5.0 (2011) Supercharger Kit

A 2.8 makes approx 750rwhp on the 5.0 Mustang GT (which is only 200cc larger than your 4.8). But when you add a 4.7 TS to the 5.0 engine, you can get over 1300rwhp at high boost. This is my favourite video: https://www.youtube.com/watch?v=1iG0AMitXtc There's also a dyno test of 2.8 v 3.6 on the KB site and the 3.6 beat its max output by 350rwhp (using the same pulley ratio) as expected.

 

I was talking until 25 psi, and there is another down side of a bigger unit not to be underestimated; they respond less wel at lower rpms, as they are less efficient in these regions.

I don't doubt at 25 psi or higher a bigger unit would be better suited, however it's not a area I am looking in to, this engine (drivetrain) probably has some weak points somewhere, and to be honest I am chickening out here now at these levels (ie the 700 hp).

Its certainly mouth watering to see these extreme hp numbers on the 5.0 Mustang engine, it seems so close to get ;-).

 

I agree at lower rotor speeds they aren't in their efficiency range, hence why it's not advised to buy the competition SCs and under spin them. On the 4.6 Mustang, the 2.8h and 3.2 both made significantly more power than the 2.6h so I think a good gain could be had on your larger engine with a bigger SC too.

I've seen your gearbox take over 1000HP when strengthened in tuned 6.0 biturbo v12 Mercedes, so I would order that 4.2 KB! Dibs on your 2.6 if you do though!

 

No, for the reasons mentioned the bigger units are not of interest to me, only the 2.8H could be of interest. However am not convinced yet the gains could be worth the effort, can you show that specific dyno info?

The good part is that within a couple of hours I can adjust the parts to fit the 2.8H, but my current supercharger is still in perfect order, so unless someone is willing to buy mine for reasonable price, the gains can’t be worth the investment for a new unit (and the work).

 

My old 4.0 engine with orginal cast pistons. Most probably too much cylinder pressure for stock pistons - so think twice if you try to get well over 20PSI from stock 4.0 or even from 4.2 with orginal alloy 4032 forged ones.

 

Nice dyno comparison between the 2.6H and 2.8H attached.

Baseline with 2.6H was 655rwhp/748rwtq with 3.5" upper pulley and 12" lower. With no other mods other than 2.8H and bigger injectors, it made 805rwhp and 880rwtq.

For those numbers they actually used the same 3.5" upper but only a 10" lower on the 2.8H as otherwise it would've made too much boost. Peak gains of 150rwhp and 132rwtq even whist spinning slower than the 2.6H. Full article here: Kenne Bell Supercharger Upgrade - Muscle Mustangs & Fast Fords Magazine

I've seen similar gains on 4.6 cobra mustang too. I'd be interested in your 2.6 if you upgrade in the future.