What did you do to / for your E53 today??

[Fifty150hs]

Originally Posted by guntherrex

new K127's make a BIG difference in handling and road noise

unfortuntely the wronmg clutch fan was delivered so that project is postponed... new HID ballast and lamp fitted and thermostat replaced for a 105 degrees one.

Stock is 95. Why would you go hotter?

[bcredliner]

I change the transmission fluid and filter every 50,000 miles. I use only OEM fluid. That's based on a long discussion with a transmission expert at a DFW repair shop that rebuilds and modifies BMW transmissions.

I change transfer case and diffs oil the same time I change trans fluid. I change the oil and filter at 5-6000 miles.

What is a lifetime to BMW? X years, X miles or X years and X miles?

[bcredliner]

Originally Posted by andrewwynn

Those are all actual weights taken off my e53. And yes definitely rear weight bias. For me my usual weight distribution is 1200 front corner and 1600 rear corner.

I have run the tires 32/39 like the door plate suggests which gets me 1200/32=37.5 in.² and 1600/39=41 in.² contact patches. I just installed brand new tires and with the way I drive I tend to scrub the outer edge of front tires I think I'm going to add a smidge of air.

1200/36=33.333 psi
1600/40=40 psi

1600/32=50 in.² (nine more in.²). Prob would be good for acceleration but not great for tread wear.

What do you mean by the way you drive?

[Fifty150hs]

Originally Posted by bcredliner

I change the transmission fluid and filter every 50,000 miles. I use only OEM fluid. That's based on a long discussion with a transmission expert at a DFW repair shop that rebuilds and modifies BMW transmissions.

I change transfer case and diffs oil the same time I change trans fluid. I change the oil and filter at 5-6000 miles.

What is a lifetime to BMW? X years, X miles or X years and X miles?

Good question. I have almost 261,000 miles and 15+ years on mine. I'm planning to make at least 300,000. Been around 100,000 since I changed trans mission fluid and filter. I'm about due. Recently did the diffs. Need to check my records for transfer case. That could be due too. Oil changes every 5000 miles with Lubrimoly full synthetic.

[oldskewel]

Originally Posted by andrewwynn

I have square setup but that doesn't matter. Contact patch is force (weight) / pressure. Wider tire just means less length front to back.

It's worth the $ to get a weight measurement on your truck to know what the axles weigh with a typical load then do a little math and see how big your contact patches are. It's not ideal to have exactly the same as more weight will be helpful to have more tread on the ground but if you like to corner fierce like I tend to, finding a balance that is not entirely understeer is a good thing.

That simple formula would be correct if the tires were balloons, with no structural rigidity. Reality is a lot more complicated. The following page I just found (top of the list when I googled your "Contact patch is force (weight) / pressure") goes into a lot (too much in some places?) detail on this, comparing with experimental data from a tire manufacturer. It's easy to get lost in the details he presents, but it all makes sense, and much closer to reality than the balloon model.

https://www.enginebasics.com/Chassis...t%20Patch.html

[andrewwynn]

Originally Posted by bcredliner

What do you mean by the way you drive?

I tend to avoid brakes for hard corners. With a car that understeers that temds to scrub the outer edge of the front tires

[LA02MAX]

Can it just stay pretty and new like this, please?? ��

[guntherrex]

Originally Posted by Fifty150hs

Stock is 95. Why would you go hotter?

I can only find 108 and 105 here? (4.6 IS)

[Fifty150hs]

Originally Posted by guntherrex

I can only find 108 and 105 here? (4.6 IS)

Didn't realize you had a V8. Still sounds high.

[EODguy]

Today I questioned the parentage of the White Witch as I got a transmission fail safe (code 5088) EGS sensor/trans switch L1-L4.

After resetting everything so I wasn't on the losing side of the Haji-lition derby and then she wouldn't crank over. She did start after going to sleep so... Ignition switch too?

Before I get all medieval on her ass, can anyone think of any additional checks, tests or spells to do?

M!!

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