E30 M3 S62 Build - Loads of queries about 4x4 drivtrains

[Turk]

with strong dowels right down to the rear case bolts, I will be using 8 x M10 130 bolts, If you look closely you can see where we have punched holes for the transmission side.

[The Dark Side of Will]

How are you planning to locate it on the transmission side?

[Turk]

made some progress on the tcase plate. Gonna pick up some dowels to extend the case to the 8 of the mounting points of the rear case. so should be nice and strong. My mate has taken the datum point so Ill be able to remake one if anyone want one, or I need a spare for a 2nd attempt :P

[Turk]

once the caster top mounts are in i think it will be down to around 2.5 inches. If you look at the power steering reservoir it give quite a good indication. I really don't think the difference will effect the handling that much... Im much more confident it will work after seeing them and getting under the car to measure up etc.

[The Dark Side of Will]

Yep, that's a bit backwards.

The engine bay pics above aren't mine... I just pirated them from elsewhere. If you eyeball a line (or draw one in paint) across the strut towers for each picture, you can compare the spots where they cross the intake manifold. That looks like 4 inches or more to me...

[Turk]

HAHA, Wrong way round :D

The dowels misled me! i will have to grind them off...

[Turk]

Got the old subframe off, and new one on (ish)

It doesn't quite site flat at the rear of the frame. this is where the roll bar bush housing lip is poking through and fouling on the frame. Either hammer or dremel will sort that. I wasn't quite sure it i have it the right way either. I have matched the dowels to the holes as the old subframe was and has bolted up with dramas. is this correct????

[Turk]

Can u measure the strut nut to bulkhead distance for me?

[The Dark Side of Will]

OBTW, here's a pic of E30 iX strut towers. You can compare to a RWD E30 engine bay and see that they're pretty far out of place.



Edit:

[The Dark Side of Will]

I know I read somewhere in a credible source that the E34 M5 used a single-sided active sump to get the oil out of the cam cover on hard left turns... just like the E39 uses a dual sided sump for the same reason.

[M3 euro ltw]

The 3.8 litre E34 M5 also had an active sump that behaved similarly to the E39 sump, but obviously only on left turns...

I think it was both the M5's increased lateral g capability relative to the 540 and the probability that it would be driven hard (specifically that it was *designed* to be driven hard) that drove them to the active sump.

This did not ring a bell, but I was only superficially aquainted with 3.8.

I don't see anything in 3.8 pump or pan to indicate active sump scavenging.

Perhaps you meant the S50B32, the 3.2 liter "euro" M3 engine, that came with a dual pickup pump and pan assembly, first seen in the limited 400 or so GT International 3.0 liter cars, and the US LTW.

Possibly you're thinking of the M88 from the M1. That engine was actually dry-sumped from the factory. Little known trivia that a street car from BMW in the 80's was drysumped!

[The Dark Side of Will]

The 3.8 litre E34 M5 also had an active sump that behaved similarly to the E39 sump, but obviously only on left turns...

I think it was both the M5's increased lateral g capability relative to the 540 and the probability that it would be driven hard (specifically that it was *designed* to be driven hard) that drove them to the active sump.

[M3 euro ltw]

so in essence what you are saying is that if the x5 sump and pump were to be used, it would be sensible to baffle the sump to prevent oil collection at the rear of the sump?

then if there are pressure issue move to accusump...

From my understanding as I will be having the oil switches disabled through the ecu anyways the adaptive pump has no chance of doing what it needs to anyhow... Therefore moving to an M62 pump will offer identical characteristics as the s62's pump with inactive switches.

How much do accusumps go for and would they be compatible with x5 stuff?

Not sure what they cost, I'm sure there are various price points for quality like anything else.

It is difficult to read BMW's mind, or have insight into their data.
I think it is fair to assume that the pump and pan that came on M62 engines in the E39 chassis was not up to spec, or they would have used that.

It is pure speculation as to whether the X5 pump and pan set ups is better or worse in terms of performance and or need of baffles.

If they had made a version of S62 to go into the X5, we would know...they would have retained the X5 pan, or done something different. Alas, we know not.

And, yes, I agree, if there is functionality for the pair of solenoids that you're flashing out, you certainly don't have to worry about retaining the two stage S62 pump..... although, you could have improved vapor management, and less risk of lateral scavenge issues if you simply plumbed to scavenge BOTH heads, all the time with a second stage.

Dry-Sumpers with NASCAR boys might have a 5 stage pump. One for each head, one for the valley, two for the pan. or something like that.

Alex.

[The Dark Side of Will]

http://www.lmgtfy.com/?q=accusump ;)


Also...

http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=170788305531

Keep an eye on this. The tall ratios for the front end are quite rare.
It may or may not be compatible with the E53 sump or front diff case, however. The E70 front diffs have the crown wheel welded to the carrier. I don't know what goes on inside the E60 front diff, what width the carrier is across the bearings or anything.

[Turk]

so in essence what you are saying is that if the x5 sump and pump were to be used, it would be sensible to baffle the sump to prevent oil collection at the rear of the sump?

then if there are pressure issue move to accusump...

From my understanding as I will be having the oil switches disabled through the ecu anyways the adaptive pump has no chance of doing what it needs to anyhow... Therefore moving to an M62 pump will offer identical characteristics as the s62's pump with inactive switches.

How much do accusumps go for and would they be compatible with x5 stuff?