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Old 03-08-2007, 01:58 PM   #16
ASRACER4
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i got a 96 also just buy the code readers there 30 or 40 dollars on ebay
tune ups are easy on this car. plugs and wires less than 100 maybe 1 hr to install tops. fluids change are a good idea and cheap insurance.
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Old 03-08-2007, 03:34 PM   #17
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Quote:
Originally Posted by zboot View Post
The manual says to run 91. I do that with a 60:40 mix of 93 to 87.
Octane does not just "mix up" based on ratio.

As a matter of fact most often mixing fuel results in LOWER octane.

I sell race gas, and at the Champ car event here in PDX work with
the fuel distributors, and the engineers they send to the races. Mixing fuels is one of their inside jokes. They tried all kinds of blends and tested them and it was very rare that it ever came out right or better. He mentioned that there are even a couple brands of 104 octane that yield about 90 when mixed. Because the additive packages were not compatible and actually killed each other.

I run 89 when the temps are under 65 or 70 and 93 when the air temps are over that. In real cold weather I drop to 87 to keep the engine temperatures up. Lower octane = higher head temp and higher octane = lower head temperatures. All gasoline has the exact same amount of stored energy, octane roughly equates to how fast the fuel allows the energy out, lower octane is faster burning and higher octane is slower.

If you grab a Sunoco brochure or a VP brochure it usually has a table showing compression ratio to octane for picking the right fuel for racing, kind of gives you the idea....

Dave
PDX
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Old 03-08-2007, 04:06 PM   #18
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Quote:
Originally Posted by pdxmotorhead View Post
Octane does not just "mix up" based on ratio.

As a matter of fact most often mixing fuel results in LOWER octane.

I sell race gas, and at the Champ car event here in PDX work with
the fuel distributors, and the engineers they send to the races. Mixing fuels is one of their inside jokes. They tried all kinds of blends and tested them and it was very rare that it ever came out right or better. He mentioned that there are even a couple brands of 104 octane that yield about 90 when mixed. Because the additive packages were not compatible and actually killed each other.

I run 89 when the temps are under 65 or 70 and 93 when the air temps are over that. In real cold weather I drop to 87 to keep the engine temperatures up. Lower octane = higher head temp and higher octane = lower head temperatures. All gasoline has the exact same amount of stored energy, octane roughly equates to how fast the fuel allows the energy out, lower octane is faster burning and higher octane is slower.

If you grab a Sunoco brochure or a VP brochure it usually has a table showing compression ratio to octane for picking the right fuel for racing, kind of gives you the idea....

Dave
PDX
As you know racing fuel differs greatly from fuel for passenger vehicles. The additives in them are specially formulated for the vehicles they run in. So, I can imagine that mixing racing fuel may not necessarily yeild better results.

And YES, you do mix high-test and low-test octanes to make midgrade. I'm in a special position to know this because I work for a company that builds systems to control fuel pumps and fuel stations. None of our customers buy 89. They mix from their tanks of (typically 93 but sometimes 91) and 87. Our software lets them enter the percentage mix they use and when someone buys 89, it subtracts the appropriate amount from the variables tracking the gas left in the 87 and high-test tanks.

I have no idea what racing fuels were being mixed by your guy so I cannot speak as to why they did not combine well. However, every person who buys 89 from a commercial gas station is getting a mix of (either 91 or 93) and 87. You can check this by asking the next gas station attendant that you come across.
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Old 03-08-2007, 04:13 PM   #19
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The issue with mixing at the pump is that you don't get a good mixture if you just pump in all the 87 you're going to buy then all the 93. I've been doing a sequence of 1/2 the 87 then 1/2 the 93 then 1/2 the 87 then 1/2 93. I'm sure the pump that combines the stuff for 89 is probably injecting both sources simultaneously through some mixer or agitator or specially designed nozzle that would do the same.
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Old 03-08-2007, 08:55 PM   #20
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many moons ago when i worked at a gas station
there was only 2 tanks for the gas to go in
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Old 03-08-2007, 09:48 PM   #21
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I have never noticed any trouble running 87, however, in a hotter climate or under harsher conditions it might be wise to use 89 or 91. The book calls for 89 in the 1995 M42 engine.
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Old 03-24-2007, 09:03 AM   #22
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What I would do to 'tune up' the car:

Burn through a bottle of Techron.
Change oil.
Change spark plugs.(NGK BKR6EK = OE and $3.99 @ Pep Böys!)
Change air filter.
Change fuel filter.
Change O2 sensor. . .mmmmmmmmmmmmaybe.


Advance Auto has Techron on sale '2 for 1' through March 31. Woohoo! Good sh!t that I rarely see on super sale. Stock up. Good practice to burn a bottle at every oil change.
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Old 03-24-2007, 09:05 AM   #23
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i found out all the Sunocos here have GT 100 octane gas...I just want to try that before a driving day.
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Old 03-24-2007, 09:10 AM   #24
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Burn through a bottle of Techron.
Change oil.
Change spark plugs.(NGK BKR6EK = OE and $3.99 @ Pep Böys!)
Change air filter.
Change fuel filter.
Change O2 sensor. . .mmmmmmmmmmmmaybe.

...........................................................................

Burn through a bottle of Techron. I'd use Redline S1 Complete Fuel System Cleaner(you can get it at pepboys, Autozone and Discount stopped stocking the product.
Change oil. plus you can change your Tranny and Diff fluids also. Redline GearOils and Mobil1 Motor oil are what goes in the Club Sport.
Change spark plugs.(NGK BKR6EK = OE and $3.99 @ Pep Böys!)(Bosch Plat +4 are better and do not foul as often as single or dual prong plugs
Change air filter...OE(14$) works and protects the best
Change fuel filter. yes, this is often overlooked cause it seems difficult.
Change O2 sensor. . .mmmmmmmmmmmmaybe...maybe I tend to wait for these to burn out before replacing.
Radiator Flush(Use OE BMW coolant and Water Wetter)
Replace your brakefluid..I use Ate Super Blue Racing all the time.
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Old 03-24-2007, 09:20 AM   #25
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Quote:
Originally Posted by bullmand View Post
Stick with the paper air filter from the dealership. They're better quality than the stuff you'll get from Pep Boys or places like that. You'll probably have to get the oil filter from them too as most of the chain places don't stock our filter. The fuel system cleaner you can get anywhere.
I agree. Pep Böys is good for generic stuff used on all makes of cars like Techron, Redline fuel injector cleaner, and NGK plugs,
but get OEM filters(Mann, Mahle, Hengst) from whichever offers the best cost/convenience for you:
1) local BMW dealer
2) local Euro parts store
3) web mail order

I mail-order all of my parts, and whenever I order something I always get a couple of filters too if I don't already have some. Oil filters for my M42 are ~$10 at my local dealer, $8 at local Euro parts store, and ~$5 on the web. Your '96 has an M44 motor with a different filter which is slightly more.

Oh yeah, you are in Philly? This place in Doylestown is kickass. I dunno if they do walk-in/local pick-up sales, but they're one of my top 3 web vendors.

http://www.bimmerparts.com
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Old 03-24-2007, 09:32 AM   #26
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www.bimmerbum.com sells Mahle filter in bulk. 10 and 20 packs.
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Old 03-24-2007, 09:33 AM   #27
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the octane choices in nz range from minimum 91 octane to max bout 98 i run 98 and it a special clean fuel made by BP but i was just wondering is it bad to run too high an octane apart from the cost???
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Old 03-24-2007, 11:29 AM   #28
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Quote:
Originally Posted by pdxmotorhead View Post
...I run 89 when the temps are under 65 or 70 and 93 when the air temps are over that. In real cold weather I drop to 87 to keep the engine temperatures up. Lower octane = higher head temp and higher octane = lower head temperatures. All gasoline has the exact same amount of stored energy, octane roughly equates to how fast the fuel allows the energy out, lower octane is faster burning and higher octane is slower.

If you grab a Sunoco brochure or a VP brochure it usually has a table showing compression ratio to octane for picking the right fuel for racing, kind of gives you the idea....

Dave
PDX
Arrow, I think that you are probably wasting $ on 98 octane fuel in the Ti. I'm not an expert, but I did once take a fuel systems class. I dunno 'bout the mixing mojo he mentioned, but what Dave said about octane rating is correct. Higher octane fuel burns slower.
It is required in higher compression motors in order to resist detonation of the air-fuel charge in the cylinder. The availability of higher octane fuels allows the use of higher compression in motors. The 'extra' power is from the higher compression spec of the motor, not from the fuel itself.
Ignition timing is part of the equation too. The Ti has knock sensors and the computer will retard the timing if it senses detonation.
Soooooo the bottom line is that if you were running, say 93-octane fuel, and no detonation is occuring, so the computer is running the spark timing at full advance with no retard, increasing the fuel's octane would get you nothing. If you wanted to take advantage of ultra high octane fuel, you would need to rebuild your motor with higher compression pistons and/or reprogram the computer(change chip) to advance the spark timing more.

http://en.wikipedia.org/wiki/Compression_ratio
http://en.wikipedia.org/wiki/Engine_knocking
http://en.wikipedia.org/wiki/Octane_rating
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Old 03-24-2007, 11:32 AM   #29
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Quote:
Originally Posted by Panzer_M View Post
www.bimmerbum.com sells Mahle filter in bulk. 10 and 20 packs.
I don't see the bulk packs on his site, only singles.

How much $, shipped?
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Old 03-24-2007, 11:41 AM   #30
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ok then thanks den so u recommend 91 octane if i dont want to change my engine around???
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