Exhaust headers

[Happy]

Originally Posted by bcredliner

The Dinan engine mods increased the redline 300rpms. That's reasonable. More than that and I would have been concerned about the valve train holding up or potential issues such as air/fuel ratio.

Did it increase on your your E70 also?

And thinking about it, I probably would not increase it on a S62. I definitely agree with you, that some engineering is better left alone.

But like you said, maybe 300 rpm’s isn’t an issue.

[bcredliner]

Originally Posted by Happy

Did it increase on your your E70 also?

And thinking about it, I probably would not increase it on a S62. I definitely agree with you, that some engineering is better left alone.

But like you said, maybe 300 rpm’s isn’t an issue.

The gain on the X5M was 70HP and 86TQ without a change in redline.

[Happy]

Originally Posted by bcredliner

The gain on the X5M was 70HP and 86TQ without a change in redline.

Great gain! IMHO I don’t see the need for a higher redline on that build, nor the S62.

[nick325xit 5spd]

Originally Posted by Happy

According to BMW for ZHP M54’s, they added loctite to the oil pump nut, slapped some cams in it, and I am assuming some kind of tune.

Like Nick was saying, the ZHP had a 6800 rpm rev limit, so my guess is, there is probably some wiggle room with the M54 for tuning, without harm. But it needs to be done correctly.

By the way, I would really like to get my hands on some ZHP cams! I would have taken them out of mine when I sold it, but I did not want to sacrifice my E53’s.

Well... The crank harmonic issue starts well below 6,800. Depending on who you ask, it's either over 6,000 or over 6,500.

In truth, it's not a huge issue for a street car. But it is a huge issue for a track car.

Here's the reasonably effective solution:
https://www.moreheadspeedworks.com/p...aded-oil-pump/

[nick325xit 5spd]

Originally Posted by bcredliner

The Dinan engine mods increased the redline 300rpms. That's reasonable. More than that and I would have been concerned about the valve train holding up or potential issues such as air/fuel ratio.

The valvetrain will go higher than the crank will tolerate without additional work in the M54B30.

The fuel system has plenty of room in it. The last BMW that was underinjected was probably the '95 M3.

[Happy]

Originally Posted by nick325xit 5spd

Here's the reasonably effective solution:


https://www.moreheadspeedworks.com/p...aded-oil-pump/

Solid design!