Ok Gentlemen,

2004 Land Rover Discovery 2 G4 Challenge Edition. 178k miles

Bought it with blown head gaskets. Got new recon heads and gasket sets from Mr. Tillery. Have new plug wires, plugs, oil pump, timing chain, all new coolant hoses, water pump. Have had the injectors cleaned and flow tested with new Orings, intake manifolds vatted and powder coated silver to match.

Anyways, decided to look at cam and its pretty much had it. Was going to order a new standard cam and did some research and came across the TWS Performance cam kit: Triumph TR8/Rover V8 Camshaft Kits

Anyone have any experience with this kit? or should I just stay with stock from Atlantic British

I know I am gonna get a ton of opinions with very little experience about it but I am ready. Was also thinking of just going all out and getting the Stage 2 kit from TWS:

TWS Performance - Land Rover Discovery II - Stage 2 Kit

but worried about it being too much for this type of block. At the end of the day a little bit better performance is all I am looking for not off roading or racing it.

Thanks for the help Guys

 

I have a truck with a Crower cam, can't tell any significant power difference, nor measure significant 0-60 improvement. Most Rover cams are very mild and will not add significant power, mostly due to the stock intake and head limitations. The factory cam was optimized for low end torque and the only real way to significantly more power is to shift to the torque peak up several thousand rpm and that requires a very big cam and ported heads. I think TWS or maybe RPI has managed to get around 300hp out of them with the maximum treatment.

No reason not to go aftermarket if the cost is the same, but I wouldn't spend more than $100 over the cost of stock.

 

i have a Crower Stage 2 cam in my 4.6 '04.

i have steel bumpers front and back and roll on 32 inch tires. even with all that added weight, i noticed a small bit of extra power on acceleration and typically cruise on the freeway at 75-80 mph. i'm in the hilly Midwest and the cam seemed to help with maintaining speed going up the Ozark hills. i mean, i still have to down shift to 3rd sometimes, but this is a heavy pig.

 

I put the mild TWS cam in my 4.6. I didn't notice any difference. If you are buying a new cam because you need a new cam then no reason not to upgrade. If you've seen a 4.6 apart to include the headers and down pipes you will see that there is a tone of work needed to make any real power. They already have plenty of tq but that's because everything is sized for a smaller displacement engine.

 

Thanks Guys,

that is what I was afraid of. It is not just about adding a cam. You will need to do head work, exhaust work ,intake, etc. etc. Then that will mean I will need to completely rebuild the bottom end. SO then I'm gonna have $4k-$7k in the engine. Was hoping to find a work around with just the cam. I will probably just keep it stock since you said you see no real difference with the upgraded cam. Seems I would have to go to the Stage 2 or above to start seeing money that was spent reflected in performance. Thanks again

 

To make more HP without adding displacement or increasing compression means it will need to make it higher in the rpm range. The ports in the heads are just way too small to see any meaningful gain. You could do a lot of port work but then the exhaust collector becomes the restriction, then the throttle body diameter etc... So unless you plan to go full custom exhaust, aftermarket efi or carbed it's just not worth the effort in my opinion. Spend the money on lower axle gears and take weight out where you can. I see people in all types of off roaders these days hauling around a silly roof tent, awning, snorkel, racks, lights, all of which kill performance, reduce fuel economy, and make horrific wind noise only to use it once or twice a month for overlanding.

 

I’m glad I saw this thread as it’s good info in confirming you need to do all the other stuff to get more in and out of the engine in order to take advantage of some bigger lobes.