07-23-2024, 07:17 PM | #1 |
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Trying to supe up an older car
Hi! I'm a new owner of a 2007 750Li (e66) sport model. Overall, the car is in decent condition but as usual for older 750's, it needs maintenance. After I fix the car up, I want to make some more horsepower with the vehicle. I want to do an exhaust on it, as well as possibly a new intake system and a tune. My goal hp range is somewhere over 450 whp, the car currently makes about 360. Does anyone have any ideas or share their opinions on how I should go about this process or what I should do differently? I would like to point out that the car was a gift, and I plan to either dog the car put or make it like new and daily drive it.
Last edited by Canibot; 07-24-2024 at 08:30 AM.. Reason: Adding more info. |
07-24-2024, 03:27 AM | #3 | |
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and you will get 500 HP.
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07-24-2024, 09:06 AM | #4 | |
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I’d sell it and buy a car that is faster already. An intake and exhaust and tune on the 2007 750 will help the sound but not get you anywhere remotely close to your power goal. A BMW that is turbo to begin with will be the easiest way to go. |
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07-24-2024, 09:17 AM | #5 |
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I reckon you got an incredible deal on that e65 gen. They're not especially popular so you have money to burn on it.
The same N62 engine was in the e60 550 which most folks that have modded them have gone strait to forced induction. Supercharging is the simplest but changes the character of the motor significantly. The e60 forums might inspire some ideas. If you haven't done it already do research the known issues with the N62. They're not as bad as the early N63 engine but you need to stay on top of it.
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07-24-2024, 09:30 AM | #6 |
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Don't know BMWs well, but agree with all of the above. Bolt-ons are not going to get you there. I would surmise that intake, exhaust and tune will get you 30ish WHP. And FI can get pricy and brings with it many issues regarding longevity on a NA engine.
Of course, if money is no object...but, I'd "make it like new" and DD it.
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07-24-2024, 09:32 AM | #7 | |
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Nice clean car. A real steal.
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07-24-2024, 09:46 AM | #8 | |
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07-24-2024, 09:47 AM | #9 | |
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And money is definitely an object so. |
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07-24-2024, 09:57 AM | #10 |
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Turbo is expensive and complex to add to a non turbo engine and would require custom tuning. Don’t bother unless the car has sentimental value and you have deep pockets. On some models, like the E36, many have done it so the path is well known (I supercharged and then turbocharged mine), but few modify the E66 750 so turbocharging will not be easy.
I think an exhaust, intake and tuning to match will also be expensive since the market is tiny and the results pretty mild. You might add 10% power, which is enough to feel. Getting rid of cats is illegal and tuners in the US won’t sell you a tune that gets rid of the CEL, which means that in states with OBD2 plug in inspection, you will fail. I had a 2008 E70 X5 4.8i with the same drivetrain and it was a nice car but not very fast. The top end was more impressive than the off the line acceleration. You will also find the 750i is a complex and expensive car to maintain and repair. MPG is bad, there is much that goes wrong on 15-20 year old BMWs and the fancier models line the 750 are more complex. I’d try to sell it and buy something more moddable and DIY friendly, especially for a young guy on a budget. |
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07-24-2024, 10:14 AM | #11 | |
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07-24-2024, 10:21 AM | #12 | |
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07-24-2024, 10:36 AM | #13 | |
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If you're uncertain you could take your time restoring it then sit on it and see if the market demand turns around on it. Based on my experience, I think it's a low percentage move but nobody knows the future 100 percent.
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07-24-2024, 10:47 AM | #14 | |
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07-24-2024, 10:49 AM | #15 |
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I haven't heard the phrase "supe up" since the 80's. Thanks for bringing back some memories of when I used to supe up my cars.
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07-24-2024, 10:56 AM | #16 | |
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I know a kid that has an early N63 550i and loves it even though he knows it is a grenade. It has a low cost entry point, he knows it's faults, is content to live with it's high maintenance because it's special to him. Full discloser: I have owned three Mazda RX7s that are also grenades and loved all of them.
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07-24-2024, 11:05 AM | #17 | |
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07-24-2024, 11:35 AM | #19 |
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I do think that an exhaust, intake and tune is a decent plan. Don't expect miracles. And a full detail and paint correction. Plus, and mainly, the mechanicals. Sorry, if I wasn't clear. Beyond that, diminishing returns.
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07-24-2024, 11:53 AM | #20 |
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I guess the real question is why you need more power? You have a car that had plenty of power in its time. 360hp is no joke. It is a luxury sedan not a drag racer. Just enjoy it for what it is. Intake, exhaust, etc adds very little hp for significant dollars. Not worth it in my opinion. One thing you could look at is newer tires.
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07-24-2024, 12:28 PM | #21 | |
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I’d consider selling both the 323i and 750i to buy a hardtop car you can mod. Maybe an E46 since they are newer. E36 interiors start falling apart at 20 years. |
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2007, 2007 bmw, 750, 750li, e66, restore |
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