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Home > Technical > 4.2 Supercharged remap |
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avos Member Since: 26 Aug 2008 Location: Belgium Posts: 106 |
If you are interested you can contact me via PM RRS SDV6 HEV Dynamic
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Wed Jan 12 2011 6:25am |
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Conrod Member Since: 18 Jan 2011 Location: Sheffield Posts: 7 |
Avos is spot-on with what he says about high speed efficiency of the Eaton not making most of the pulley upgrades at top end, but across most of the rev range the difference really is a full 10% - and it feels like a huge difference. Whether upper or lower pulley conversion, in terms of £ per bhp it's pretty much unbeatable, very simple and achievable DIY at home. On the eighth day, the Lord said 'Let there be power', and he gave unto man nitrous oxide. |
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Tue Jan 18 2011 8:54pm |
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paulmc Member Since: 07 Sep 2010 Location: Aberdeenshire Posts: 25 |
The 2.6 Large Bore twin screw supercharger only 2000$ to buy, but then you need all the fab work to get it to fit. If you have access to a good fab shop you could always take your time and hide the cost from the wife Cayenne Turbo "S" 521bhp Standard
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Tue Jan 18 2011 9:28pm |
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Buster007 Member Since: 02 Dec 2010 Location: Essex Posts: 649 |
Which is the best pully to change top, bottom or both? Also where can I buy them & do I need a new longer/shorter belt?? Cheers Laurence. |
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Tue Jan 18 2011 10:11pm |
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paulmc Member Since: 07 Sep 2010 Location: Aberdeenshire Posts: 25 |
Search ebay there are pulleys on there. Top one needs to be cut off or a special puller is needed. I have not looked how difficult the bottom pulley is to change. Changing the top pulley does increase the chance of the belt slipping as it is smaller so less surface area / friction to allow the belt to grip.
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Tue Jan 18 2011 11:22pm |
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Conrod Member Since: 18 Jan 2011 Location: Sheffield Posts: 7 |
As paulmc says, top pulley needs to be cut/ground off or removed with a puller, and the replacement is fitted by heating it up with a good blow lamp, or acetylene gear, so it can be slid onto the shaft. The 1.5psi top pulley needs no further work, while the 2.5 psi pulley needs a small amount of aluminium to be removed from the supercharger snout with a rotary file or similar. It's still a DIY job and the kits come with a template to do this. Slippage has in the past been a factor for upper pulleys because you're reducing the pulley diameter and available surface. However, the 'bad rep' is due to some people making them from aluminium, which does tend to slip when hot. The better pulleys, made of a reasonable quality general machining steel like EN32, don't slip. We go a step further and make them in stainless steel, which doesn’t give slip problems but for peace of mind offer Goodyear Gatorback pulley belts as an option – they give increased grip (as well as less noise and longer life) for less than the price of a Jaguar or Range Rover supplied belt so there is no issue. On the eighth day, the Lord said 'Let there be power', and he gave unto man nitrous oxide. |
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Wed Jan 19 2011 8:40am |
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carlos50 Member Since: 04 Oct 2010 Location: North East Posts: 396 |
Conrod
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Wed Jan 19 2011 8:52am |
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Conrod Member Since: 18 Jan 2011 Location: Sheffield Posts: 7 |
It's generally viewed that the lower pulley is the better option for the 4.0 engines, and the upper pulley for the 4.2, as the 4.2 already has a 5% bigger lower pulley than a 4.0 (so will only gain 5% from a bottom pulley change). Lower pulley kits come with a longer belt, uppers can use the existing belt. Doing both is certainly an option, and many have done it. It will double the midrange gain, but the peak power gain will be no more than with one pulley (because we'll already have maxed the Eaton at 5500rpm plus). That said, on a car weighing as much as Sport, it’s midrange we need not top end and with both pulleys done it will feel like the car’s gained a litre or two of engine. BUT, heat buildup in the intercooler circuit will become an issue with both pulleys changed. That’s curable with a bigger pre-rad and coolant pump, but is further expense required when doing both pulleys. There are pulleys available on eBay or through a number of Jaguar specialists, or pm me and I’ll give you a list of what we provide at Club/Forum prices. On the eighth day, the Lord said 'Let there be power', and he gave unto man nitrous oxide. |
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Wed Jan 19 2011 8:53am |
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ciaa Member Since: 31 Mar 2009 Location: Dubai Posts: 70 |
Hi, Has anyone fitted an uprated supercharger coolant pump?, as far as i can make out this Bosch pump is what is fitted as standard by LR ( its basically the bosch pump inside a Land Rover box ) Cheers 2006 RRS Supercharged Hawke Saker 22" rims Nitto Tires Larini exhaust System ECU remap Modified and ported supercharger with 3lb pulley |
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Sun Feb 27 2011 5:44pm |
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avos Member Since: 26 Aug 2008 Location: Belgium Posts: 106 |
You could be right, I may have mistaken the hella pump that is used in the jaguars, and there you have the flow difference as mentioned. It probably is still labeled Bosch right?
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Mon Feb 28 2011 7:04am |
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ciaa Member Since: 31 Mar 2009 Location: Dubai Posts: 70 |
Ahh ok thanks avos, yes it seems to be the same Bosch pump.
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Mon Feb 28 2011 7:18pm |
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avos Member Since: 26 Aug 2008 Location: Belgium Posts: 106 |
The intercooler circuit is seperated from the main cooling system and also has its own radiator. However it is connected to the main cooling system thought thre is no coolant flow beteen the system. The connection there is used so there is some airbleeding via the standard cooling system and you also profit from the extra pressue, so good system imho. RRS SDV6 HEV Dynamic
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Tue Mar 01 2011 7:10am |
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ciaa Member Since: 31 Mar 2009 Location: Dubai Posts: 70 |
Ahh ok, thanks for clearing that up Avos 2006 RRS Supercharged
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Tue Mar 01 2011 7:28am |
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ciaa Member Since: 31 Mar 2009 Location: Dubai Posts: 70 |
avos,
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Tue Mar 01 2011 9:02am |
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