Supercharging

[Canibot]

Hi, its that one dummy who wants to make power with an 07' 750li again!

I have found a supercharger kit online for the n62 4.8L engine, and i wanted to ask some questions.

https://esstuning.com/ess-n62b48-g1-...harger-system/

It says on the website that it is meant to fit a 550i or a 650i but not a 750, my question is what exactly is the difference between these cars. To my knowledge, they all have the same size engine, producing around the same bhp. Could someone with a little more bmw engine knowledge explain to me why this wont fit, and what mods ill have to make to the engine to make this fit. I've been searching for weeks for different systems for this car that wont set me back 10k. Even with the kit ive found Im expecting to spend at least 8k or more making it work, which is over what i wanted to spend but it is what it is.

[DanG]

I am assuming that they don’t have the software to flash the ECU on a 750 or an X5.

[pbonsalb]

If the ECU are the same the hardware could probably be adapted or custom fabricated for any differences in engine bay layout. If the ECU are different, that is likely a much bigger problem.

[Canibot]

Originally Posted by pbonsalb

If the ECU are the same the hardware could probably be adapted or custom fabricated for any differences in engine bay layout. If the ECU are different, that is likely a much bigger problem.

Ive done research on different ecu's that could work with the car, how intensive of a change is it to change the ecu. Im guessing the physical work isnt the hard part, but rather figuring out the software

Update: I emailed them and they said besides a fitment issue with the engine cover and accessory drive, there are 2 different maf sensors and the ecu is completely different.

[Canibot]

I did, seems like a lot of work to make this fit.

[Canibot]

https://hydemotorworks.com/shop/prod...kaiser-bmw-v8/

I have also found this, which claims to fit on the alpina b7 models 03' to 08'. This car is essentially the same thing but the engine might have some differences given that it stock produces about 500 hp.

[Canibot]

I am well aware of the possible engine issues with more torque, and i was already planning to open up the exhaust, i was gonna straight pipe it and co catless downpipes since by the time the car is ready its gonna be historic and i can do stupid things to it. I also planned to do some engine work to hopefully make it a little tougher when I get all the basic maintenance it needs after not being driven for like 6+ years. I was thinking about doing a new transmission but thatll set me back thousands of dollars so i might just rebuild it and pray it keep running. in the long run its probably gonna set me back at least 15k, but thats over the course of like 3 years. At least thats my goal. I already have wider and larger wheels for it thatll hopefully help. And the rear end will have to suffer because im welding that bish.

[Canibot]

Im also aware of the extra strain of putting larger wheels on it, but the ones ive picked out are significantly lighter than the current wheels.

[pbonsalb]

Originally Posted by Canibot

https://hydemotorworks.com/shop/prod...kaiser-bmw-v8/

I have also found this, which claims to fit on the alpina b7 models 03' to 08'. This car is essentially the same thing but the engine might have some differences given that it stock produces about 500 hp.

No tuning. Figure that out first. As some of us have commented in this and other threads of yours, you are starting with the wrong car and it will end up being expensive to add 50% power. Save your money and buy a performance car later. This car will eventually kill you in stock form just on repair costs.

[Canibot]

Originally Posted by pbonsalb

No tuning. Figure that out first. As some of us have commented in this and other threads of yours, you are starting with the wrong car and it will end up being expensive to add 50% power. Save your money and buy a performance car later. This car will eventually kill you in stock form just on repair costs.

Trust me if I get a chance to buy or trade this car for something of better quality without spending an extra 10k then I will. My only real issue however with getting a different car, is everything I'm looking at will require historic tags where I live in order to make the car run how I want it, and I'm not old enough to register a historic vehicle and insure it. I'm just hella impatient I know if I wait then i can do something much cooler. Do know that I have considered everything that you and others have posted and I greatly appreciate all the recommendations. I might do something to this car or i might get rid of it, i have at least 4 years to figure it out so..

[JD_BMW]

Originally Posted by Canibot

Trust me if I get a chance to buy or trade this car for something of better quality without spending an extra 10k then I will. My only real issue however with getting a different car, is everything I'm looking at will require historic tags where I live in order to make the car run how I want it, and I'm not old enough to register a historic vehicle and insure it. I'm just hella impatient I know if I wait then i can do something much cooler. Do know that I have considered everything that you and others have posted and I greatly appreciate all the recommendations. I might do something to this car or i might get rid of it, i have at least 4 years to figure it out so..

Isn't that bit of a nonsensical argument though? The thing about spending 10 grands. You'd have already spend $10k on the supercharger, the other mods you're thinking of and as others mentioned, the maintenance costs later down the road.

It would indeed be more beneficial to just buy a car meant for performance if you want more speed.

The old 7-Series is more of an executive regular.

[Canibot]

Originally Posted by JD_BMW

The old 7-Series is more of an executive regular.

This is the part that upsets me, because its such a cool damn car but they're stupidly expensive to work on and only came in an automatic trans.

And yes it is nonsensical but idfk what I should be doing with this car. I know what I want but I also know I cant afford it.

[DrVenture]

Originally Posted by pbonsalb

...

Peanut Butter On Sliced ? ? Bread is my guess

[s_ribs]

OP- go buy a cheap older Miata and put an ebay turbo on it. You'll be able to do this for well under 10k and make an easy 200 whp in a light car. They are an absolute riot. Drive that when you want to rip around and still enjoy your 7-series (for what it's meant to do) as your DD. Best of both worlds.

Bonus is that you will actually be able to sell the Miata when you are ready to move on.

[Canibot]

Originally Posted by s_ribs

OP- go buy a cheap older Miata and put an ebay turbo on it. You'll be able to do this for well under 10k and make an easy 200 whp in a light car. They are an absolute riot. Drive that when you want to rip around and still enjoy your 7-series (for what it's meant to do) as your DD. Best of both worlds.

Bonus is that you will actually be able to sell the Miata when you are ready to move on.

I've been considering this option now for a minute. If I get a chance to do this I will in a heartbeat, i just cant currently afford another car on the insurance, and where I live you have to have insurance in order to register a vehicle. But believe me I will do this if I can get the insurance.

[s_ribs]

Originally Posted by Canibot

I've been considering this option now for a minute. If I get a chance to do this I will in a heartbeat, i just cant currently afford another car on the insurance, and where I live you have to have insurance in order to register a vehicle. But believe me I will do this if I can get the insurance.

Allow me to go old man for a moment here... if you can't afford to insure two cars, you can't afford to spend 10k (or any amount) supercharging this car. A reliable car is more fun than a "fast" car that you can't afford to fix.

[ekaz]

Get the maintenance done, drive it and enjoy it for what it is while you look for something else. A clean, stock, maintained 740 will sell better and for more money than whatever frankenstein performance mods you put together.
Take the 10k you were going to dump on the S/C and put it towards a new car. You'll be chasing gremlins on this forever trying to get it to work and never enjoy it.

[Canibot]

Originally Posted by s_ribs

Allow me to go old man for a moment here... if you can't afford to insure two cars, you can't afford to spend 10k (or any amount) supercharging this car. A reliable car is more fun than a "fast" car that you can't afford to fix.

I need to rephase cant afford. I do not trust myself to make monthly payments on an insurance plan for a car. Im lucky enough to have my current insurance policy paid for by my parents, but as soon as I get something else I have to figure it out. Also the 10k im talking about would be over the course of time, not one big payment.

[pbonsalb]

Maybe ask your parents if you can sell the 750 and buy a smaller BMW that gets better mpg and is simpler and more reliable and less expensive to maintain. A 235i or 335i with 3.0L single turbo N55 is reasonably reliable and easily modded. An older model with 3.0L twin turbo N54 is also fun but typically needs more work and the twin turbos add complexity. A newer model with the very nice 3.0L B58 single turbo is the best of the non-M inline 6 turbos but newer and more expensive.

[ctcarbonari]

Originally Posted by Canibot

I know what I want but I also know I cant afford it.

Amen! I know exactly how you feel...

[David70]

Think the consideration to spend $10k to supercharge an almost 20 year old BMW 750 with a kit not designed for this engine, on a tight budget where parents are paying for the car insurance is big mistake. Unlikely to go well and after the $10k investment the car will likely be worth the same or less than before you put the $10k into it, add in the risk of it never running correctly and the resulting potential disaster.

I would save up the $10k, add it to what this car is worth (sell it) and drive something else.

[Canibot]

Originally Posted by pbonsalb

Maybe ask your parents if you can sell the 750 and buy a smaller BMW that gets better mpg and is simpler and more reliable and less expensive to maintain. A 235i or 335i with 3.0L single turbo N55 is reasonably reliable and easily modded. An older model with 3.0L twin turbo N54 is also fun but typically needs more work and the twin turbos add complexity. A newer model with the very nice 3.0L B58 single turbo is the best of the non-M inline 6 turbos but newer and more expensive.

Yo, full honesty, I wouldnt be on these forums if I coulda gotten them to do that.