Hi All,

It is already some time now that I am working on performance enhancements on Jaguar supercharged engines, and have made there already some significant improvements there. I started this purely as a hobby, as the current options available are just pulley changes to speed up the Eaton faster, however I have never measured any top end gains on my car (XKR). It didn’t take me long to start experimenting with a different type of supercharger, as it became obvious that the Eaton roots type supercharger was already operating at its maximum efficiency. So I started working on a twin-screw conversion, as these type of superchargers are more efficient especially when operated at higher boost pressures, and in the mean time have also partnered up with Bill Macleod (who developed a X-pipe exhaust system for the XKR), and we are now working both together in creating a kit for the 4.0 and 4.2 supercharged engines. Our latest dyno showed 470 rwhp on a 4.0 XKR. Depending on the drive train losses this could be between 550 BHP with 15% drive train loss or even 600 BHP if one would use a 22% drive train loss (which some do in the US for cars with an automatic). But to be honest I only look at the rwhp, and 470 is something you notice compared to the stock 310 rwho

But to cut to the chase (apologiy for the long intro), we believe we can do the same trick with the 4.2 supercharged engines in the Range Rover, and actually have already performed one conversion.

We expect about a 100 bhp increase to be more than feasible which would bring the total to 500 BHP, though that could even be enhanced when used in conjunction with better intake/exhaust and possibly an ECU tune.

Could this be of interested to anyone?

Andre.

Here is the link to the latest dyno result on a 4.0 XKR:
http://www.maxperformancecars.com/index.ph...mp;catid=3

I WANT I WANT...

on the condition that its reliable, you offer some sort of warantee, and it doesnt screw up my car! RR Sport supercharged 06
strut grills, strut 22" wheels, Full Kahn Kit
Brembo big brake kit, tinted front and rear lights

CLS 63 AMG Mercedes 2008, Cayenne Turbo S 2007, C32 AMG mercedes 2004, Vito Van 111CDI 2004

And on the condition that you take note of the Commercial Posting Rules  

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Hi avos - you are a cool guy - i know you from the german Jaguar forum - you should take note of the Commercial Posting Rules in here  
L 405 2013 FFRR 5.0 SC
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Thanks for pointing this out!

Just read the rules, and this might be on the border, as we are just a bunch of enthusiasts, and my post is more to see if people would be interested in a kit like this, I hope that is allowed? Maybe I should have started a poll?

I will check with the admin right what it will cost and if there is true interest here we can seriously consider becoming a sponsor.

Andre.

Ok what is the rest of the curve like? The pic you display only goes from 4110rpm to 5760rpm Sons of dogs come hither and get flesh
Clan Cameron

(Have send mail to Martin regarding sponsorship)

The gearbox wants to shift to 3rd when trying to do a pull in 4th, so it is not possible to get full power curve from low rpm unfortunately on the MB box (This is the same for the ZF box). At 4150 rpm the 4th gear is just selected, so from there it is full power again.

The power delivery is already from very early on in the rpm range, and then it stays almost flat for the full rpm range, which is one of the characteristics of a twin-screw supercharger.

Andre.

5 speed MB gear box on the 4.0 l Jaguar engine and 6 speed ZF gearbox on the 4.2 l Jaguar/LR engine..... 
L 405 2013 FFRR 5.0 SC
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WINNER - 2009 �Best Avatar� Award
WINNER - 2009 Comedian Of The Year Award

avos wrote:

(Have send mail to Martin regarding sponsorship)

Thanks Avos  

2009 Outstanding Contribution Award - Joint Runner Up
2009 'Tech-Head Of The Year' Award - Runner Up

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