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Forced Induction Forum Sponsored by Active Autowerke
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Old 06-20-2009, 11:25 PM   #21
glee403
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Beautiful job! I feel like the s/c is a mod that a lot of people shy away from, including myself just b/c of the scare of reliability and mpg (thought it'd drop at least 3 mph city/highway) and only dream of what it might feel like. Kudos for doing it yourself! Can't even imagine how nice that whistle/whine sound must be behind the wheel
I am curious as how the mpg looks overtime...hopefully it stays relatively the same, b/c in that case, you just got a a ton of boost for the same amount of gasoline you're sipping
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Old 06-24-2009, 10:36 AM   #22
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As long as it's installed properly I wouldn't foresee any issues with reliability. Any of the leading manufacturers of SC's for e46s (AA, VF, ESS) have all done extensive R&D and subsequent testing, and all have good history regarding the reliability of their kits.

To the point about the gas mileage... The supercharger really doesn't take that much power to spin, so driving moderately shouldn't really affect gas mileage that much at all. The problem comes in when the driver can't resist using the extra power and feels the need to shift at 6K rpm all day long. This will certainly have a pronounced negative affect on mileage. Also, a centrifugal SC isn't really doing very much in the boost department below 3K rpm, so as long as you drive it easy, it's almost like the blower isn't even there.

I will periodically update this thread with my long-term gas mileage and other observations.
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Old 06-25-2009, 03:10 AM   #23
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Curious to hear how that 3.07 diff is working for you.
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Old 06-25-2009, 09:44 AM   #24
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Oh, hey man, (^^ guy that hooked me up with the 3.07) I haven't put it in yet. I'll probably get to it next weekend. I can't wait because the gears go by waaaay too fast right now with the blower AND the 3.46. I think the 3.07 is going to be perfect, but I have to wait until I get time to install it. I'll definitely post up my experience with it in about a week and a half.
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Old 07-13-2009, 11:27 AM   #25
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differential update

Well, the 3.07 diff has been in for about a week now, and I'm happy to report that I applaud my decision to go with the taller "middle-of-the road" ratio. I am a big proponent of the 3.46 diff in a NA 330, but with the supercharger the gears go so quick that I felt like I was in a constant state of shifting. I feel that the 3.07 ratio is the perfect balance between performance and driveability for me. The car can now reach ~65mph before I have to change into 3rd gear, and I can ride that out until about 100mph. Also, spending a bit more time in each gear allows me to enjoy the extra power and torque the engine now produces before I have to momentarily interrupt it for a gear change. And lastly, I like that I've been able to cut my cruising rpms by about 400-500 at a given speed. I never had a huge problem with the highway rpm levels with the 3.46, but it's nice to have the engine a little bit quieter, and I'm not going to complain about the extra mile or two per gallon I'll be picking up.

My next update will contain gas mileage reports after I've collected the data from a few more tanks.
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Old 07-13-2009, 11:33 AM   #26
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Great write up. The info on the taller diff helped. I'm glad you like the 3.07 unit since I'm going from the stock 2.93 to a 3.15.
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Old 07-13-2009, 04:39 PM   #27
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Did you have to send out your ecu to VF to get reflashed?
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Old 07-13-2009, 07:12 PM   #28
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Not really. I've only driven about 450 miles since the kit has been on, and 300 of those were driven intentionally slow and soft for the break in period. I've only really "hit it" a few times to test what it can do, and the remainder of the miles have been driven very moderately. Overall, my computer reports 23.5 mpg with the supercharger. Also, keep in mind I have a 3.46 diff right now so my mileage is likely to be 1-2 mpg lower than a car with a stock ratio.
My computer MPG and "miles left" has never been accurate since my VF S/C was installed. Bugs the hell out of me too. I haven't even bothered to look at the thing in quite some time but I believe I remember it suddenly jumping to some impossible 35 mpg. I didn't notice much of a difference in mileage unless I'm consistantly getting on the accelerator.

If I drive at a reasonable speed on the highways I still get around 400 mile from a tank, I have a 328ci.

I'd be interested to know if you think your computer is still accurate.
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Old 07-15-2009, 10:32 AM   #29
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Great write up. The info on the taller diff helped. I'm glad you like the 3.07 unit since I'm going from the stock 2.93 to a 3.15.
You will be very happy with the change.

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Did you have to send out your ecu to VF to get reflashed?
Yes, you always to when adding forced induction. Very simple process, however. 1) unclip DME 2) send to VF 3) it comes back reflashed and ready to install in a couple days. In my case, they had my computer back way before I was even able to finish the install, and the return shipping is included in the price of the kit.

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I'd be interested to know if you think your computer is still accurate.
I'm glad you mentioned that. I've checked the OBC against my manual calculations many times and it's always been spot on. I will make sure to take "old fashioned" measurements to compare with what the OBC reports just to be certain.
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Old 07-15-2009, 03:57 PM   #30
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sweet, how many miles do you have on your car?
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Old 07-16-2009, 02:29 PM   #31
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Only about 650 with the S/C so far. Just over 45,000 total on the car.
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Old 07-16-2009, 04:04 PM   #32
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Good Job for your first time installing our kit- Enjoy!
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Old 07-16-2009, 08:21 PM   #33
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Interesting that you switched to a 3.07 diff. I want to go from my 3.64 to 4.1! The taller gears make sense, my 3rd gear pulls way harder than than 2nd. Awesome write up by the way!
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Old 07-19-2009, 12:03 AM   #34
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I'm glad you mentioned that. I've checked the OBC against my manual calculations many times and it's always been spot on. I will make sure to take "old fashioned" measurements to compare with what the OBC reports just to be certain.
Please do and report back if you don't mind. I was told by VF that everything should be accurate but that simply hasn't been the case in fact it's been waaaay off since the install.

I understand the descrepency to be due to the increase in injector sizes. Bottom line is I'd love to have my OBC accuracy back.
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Old 07-19-2009, 06:24 PM   #35
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Does anyone know if you can up the boost on these kits. Im pretty sure they blow 6.5 psi. How can you get it up to 10.0?
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Old 07-19-2009, 06:47 PM   #36
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Does anyone know if you can up the boost on these kits. Im pretty sure they blow 6.5 psi. How can you get it up to 10.0?
Restrict the exhaust with a 1.5" muffler and you'll see 10 PSI.

Easy.
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Old 07-22-2009, 06:48 AM   #37
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Quote:
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Please do and report back if you don't mind. I was told by VF that everything should be accurate but that simply hasn't been the case in fact it's been waaaay off since the install.

I understand the descrepency to be due to the increase in injector sizes. Bottom line is I'd love to have my OBC accuracy back.
I'll definitely report my findings when I update the thread.

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Does anyone know if you can up the boost on these kits. Im pretty sure they blow 6.5 psi. How can you get it up to 10.0?
As of now, there is no upgrade option for this particular kit. Conventional wisdom would dictate that you would need an intercooler (or aftercooler) to safely boost more than about 7psi, although AA has a non-IC kit running 8.5 and I haven't heard of any problems with it...yet. I certainly wouldn't recommend doing that on this kit. As I mentioned in my review, this is not the most aggressive kit on the market. If you're looking for maximum boost, look elsewhere. This kit provides an exciting increase in power at a great price (on sale for under $4K right now) without compromising dirveability or reliability. It's also a fairly straightforward install. A full out race kit, it is not.

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Restrict the exhaust with a 1.5" muffler and you'll see 10 PSI.

Easy.
^^ Or you can do that.
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Old 07-22-2009, 06:57 AM   #38
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Sweet looking car....Im from San Antonio too.........Maybe I get to see your car someday !
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Old 07-30-2009, 09:44 PM   #39
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Looking to get this kit. How does the car pull in 2nd in city and 3rd on highway, when you step on it? A big difference from NA 330i?
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so 2004 bmw's dont come with a diff?
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Old 08-01-2009, 08:48 AM   #40
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When the car was still NA, 1st and 2nd gears pulled fairly hard and then it really dropped off in 3rd and up. With the supercharger 3rd gear pulls just like 2nd all the way up to 100mph when it runs out of rpm. I used to sometimes have to wait for passing cars to time my entrance onto the freeway, but now, I can easily exceed the pace of the traffic by the end of the ramp and choose exactly where I want to insert myself.
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