Ian928

I recently changed a burst water hose on my 06 Range Rover, and was a little surprised to see that the design of the supercharger and intercoolers looked very much like the design I have been dreaming of once make for my 928. This got me thinking if it could be possible to "just" replace the manifolds from the intercoolers to the heads and use the Range Rover system. The intake running over the middle of the supercharger should be possible to route on one of the sidesto reduce height.

I guess that to make this system low enough you probably would need to do something with the reinforcing on the front of the block, but I believe it must be possible to compensate for this.

The Range Rover engine has a water bridge in front of the engine that goves over the snout of the supercharger, something like that also needs to be done to the 928.

Has anybody looked into this? I did not take any Pictures, but here is one on Ebay for Reference (no affiliation):
http://www.ebay.com/itm/COMPLETE-SUP...450283&vxp=mtr

blau928

I have designed a similar setup in CAD for the 928. The RR/Jag setup won't fit a 928 without major modifications to the setup and also the water bridge won't allow the eaton compressor under the hood of the 928...

I also have a supercharged RR and compared many many measurements to no avail. My original design is still a better choice for my desired implementation..

Mercedes and the Chevrolet ZR1 also have similar setups to the RR/Jag..

Good luck if you still want to try and fit it..!

Cheers,

123quattro

FWIW, if you want a cheap superchager setup pick up something from a GM LSA engine. There was a problem with the first few thousand and the spring coupler in them starts rattling. They get replaced under warranty and then the techs sell the old units on Craigslist or Ebay. There is a $50 delrin part to fix the coupler. You end up getting a 1.9L supercharger for $650. The lid is another $350.

http://www.ebay.com/itm/Cadillac-CTS...d009b5&vxp=mtr

If anyone is interested in this for an LS engine, you need to be running square port heads (LS3/L98). These can't be used on top of a LS1, LS2, LS6. MAST makes sqare port small bore heads that are $2500. Accessory drive to run this is $1000.

Ian928

Richard,

I guessed someone had looked into it! When you say it can't be done without lots of modifications I take Your Word for it! Just a final confirmation, is the main problem the water bridge or will there be other major problems? I have my engine in parts and would be able to modify the block if needed.

blau928

Hi Ian,

There are two main problems..

A: The water bridge

B: The height of the assembley to fit it under the hood of a 928

For the Water Bridge issue, the main issue is the thermostat housing that goes into the block. It would take a lot of CAD work to recast a piece that ties the thermostat assembley, and the right side cylinder head to the bridge that allows the supercharger snout to clear everything.

I modified a water bridge to use my design, and it involved lots of careful measuring and cutting. It is very soft Aluminium, and melts very quickly, so you can easily destroy the water bridge and have to try not to ruin another used one if you weld. (I have pictures of the modification on rennlist, so you can see what I did... Just search my posts..)

Once you get the water bridge issue solved, you will then have to think about intake plumbing and filtration, and the way you plumb the air filter so that you do not lose efficiency due to intake restriction in the supercharger inlet system. (This is very important on roots/twisted rotor and or lysholm compressors)

The height issue is a matter of taste.. I have seen modified 928s with holes cut in the bonnet, and all sorts of stuff protruding from the engine bay. IMHO, horrible on a 928, best left t US muscle cars. (One of my system design parameters was no hood/bonnet cutting whatsoever, so the car remains stock looking. The intercooler and plumbing on the Jag/RR/Eaton setup will need to be modified to fit in the engine bay of the 928 if it were to continue to blow "upwards." The design that Andy Keel did with a similar Eaton Compressof from a Jag was put on a plate and blown downwards into a case/manifold. Using the RR setup will mean lots of cutting and rewelding the intercoolers and tubes to fit the intake ports and supercharger outlet.

The RR/Jag setup is a really tall assembley, and you do not have that much space in a 928 engine bay if you do not cut open the hood. In addition, you will need to figure out how to structurally tie the supercharger to the engine so that it does not break off the mount points and destroy the car. The drive shout should be secured in 3 planes so the compressor does not wobble and fatgue the mount points. (This means a front plate attached to the waterpump housing/front lift point.)

Another related point is the fuel injector mount holes and spray angle.. (Will the injectors spray fuel to the back of the intake valve when operating.... That is a very tricky item, and will drive you nuts figuring it out properly..)

After you do all this, you will need to figure out how to explain to the motor vehicle authorities (Tuv/DMV/EPA/etc..) that you have a RR/Jag compressor on your Porsche engine. If that applies where you live.

The block is fine as is, and you can use a JDS SuperMAF and Sharktune the LH and be very comfortable until you go off the deep end like myself. I would definitely not modify the block whatsoever. Unless you want to bore it to run larger pistons.

Much easier to use a Keel kit or a centrifugal... The Murph kits are bolt on and go. Until Hans gets his HPS setup done, you really don't have many options.

II really need to get back to my shop and do some work on the 928..! My shoulder injury has improved quite a bit, so I am thinking I should have some progress in the coming 2 months....

Best Regards,

blau928

I found some pix of the water bridge mod I did.. Here you go..