bcredliner, did you get the dyno results? Can we get an update on this system... reliability, performance, maintenance issues, extra speeding tickets (lol), etc?

Yes, we used a dyno for tuning but I never talk about HP/TQ results. I will say this--response to nitrous hit is instant. Very different than turbos and superchargers that are also more expensive mods. It's safe and tons of fun and easy to install. The looks I get when I purge the system are hilarious. No one expects an X5 to have nitrous.

No problems with original nitrous install. Just ordered the second Nitrous gauge for console a few days ago but I broke them they didn't fail. Since original install I have gone from one 10lb tank to two 15lb tanks. Added a second bottle opener and a switch to send power to either tank or both at the same time and have bottle blankets on both. No changes or problems with Snow meth system.

I just decided to spend another $5000 on the 4.6. Just ordered a scramble button for a second stage of nitrous. Will have to see on dyno how much I can add, could be as high as a 75 shot on top of the 150. Then comes timing chain job and head mods. I will be doing some engine appearance stuff when I have it apart. I have to replace the suspension airbags. I will finally install the 4.10 diff gears when I do the bags. I haven't had it out since last November, been driving my wife's X5M. I added a tune and modified the exhaust on the X5M so it is lots of fun. If I don't fall in love with the 4.6 again when this work is done it will be time to sell it. Right now odds are I will drive it for a few months after work is done and then sell it. A lot depends on the pandemic. If no car shows or meet and greets a lot of the fun is talking to other motor heads.

I don't like getting the bottles filled but that is only because I have to drive 30 miles to source and sit there for about an hour while the bottles are in a freezer getting cold enough so nitrous will transfer properly. And, I have to prepare to use it. Be sure the bottle is proper pressure, might need to heat it up. Open the bottle, purge the system, make sure there is meth in tank. On the plus side I can drive it without the nitrous and it's still fun and doesn't stress the engine.

I got caught just after I installed the nitrous doing 70 in a 35. One of those stoplight to stoplight encounters. Cop was a motor head. He looked it over, we talked about the mods and his car. He knocked it down to 10 over. I took the driving safety course so it didn't go on my record. Nothing since, that was 4-5 years ago. I don't do any top speed runs. Seldom over 110 unless on ramp is a long one.

My supercharger never runs out of power! I never have to refill.

My bad, I do have to refill my methanol tank.

Your nitrous was $5000. My supercharger was $4400.

I am just fact checking.

No, original nitrous install was about $2600. The $5000 is additional dollars I am now spending, much of that on performance improvements. The cost of the nitrous upgrade is just under $500 and that includes purchasing another spare bottle so I don't need to get them filled as often.

The complete Dinan supercharger kit was over $11,000. The Dinan kit on the 4.6 increased HP to 451 at 6000 RPMs and 439 ft/lbs of torque at 4500 RPMs.
When I was looking at the Dinan package it had to be installed by an authorized Dinan shop. The installation cost was based on 27.6 labor hours.

The ESS supercharger kit from KO which is still available is just over $9000.

I purchase mods based on performance gain per dollar spent. Performance gain is based on how much the 0-60 time improves. The supercharger would have been more than 4 times the cost for less gain in performance.

I finished rewiring all the controls in the console last week. New boost gauge arrived a few minutes ago.

Wow! I did not know those kits cost that much! I obviously received a fantastic deal from RMS, considering I have a V3Si supercharger rated at up to 22lbs of boost. That’s good for over 700+ horsepower.

Yes you definitely took a unique approach. You always state 0-60 time improvements. Is it because you are focused on quarter mile performance?

My approach was to create a E53 that is street legal, and that offered a replication as close to the E53 V12 as possible.

How much boost are you running? Certainly not 22lbs.

I am not interested in time to top speed or top speed capability. That's too fast without a roll cage and way to fast on the street.

The reason the benchmark is 0-60 is because that is the standard measurement used to compare performance of vehicles. As examples, the 4.6 0-60 stock time is 6.2. The new X5M Competition stock time to 60 is 3.7-8 seconds.
My goal is the best time from traffic light to traffic light. As far as handling the goal is to be able to take a curve at 30 more than the speed limit with the tires slightly singing.

The last time I seen the gauge hit the limit, it was at 11 lbs.

However, the E53 is in the shop as we chat. I had the intake manifold removed, all brand new gaskets, all brand new vacuum lines, brand new supercharger silicone fittings, brand new DISA, brand new MAF, and brand new O2’s.

So 12lbs may be where I am at if there were any leaks, which I am sure there was.

BMS in Houston said, road tests were producing a marked gain in power.