What does your RPM run to?

[stormspike]

I have my new S52 and 3.25LSD with ZF trans. What does your RPM run to at 60mph? Mine seems to be high and at 80 its pushing 4k. Just wondering.

Takes off fast, put she gets to 6k fast in 1st.

[Van Westervelt]

Your ZF's 5th gear is a 1:1, like the getrag 260's 4th gear. You dont have a true overdrive so the lower diff ratio is to try and compensate. Compensation never gets you anywere. lol

[Stu]

I had to read that last sentence 4 times.

[etxxz]

its all about your differential...think of it this way, having a 3.25 on a ZF tranny is like having a 4.10 with the getrag 260. 80mph at nearly 4k sounds about right. i did 75 at 3.5 and 60 at like 2.8-2.9k.

solution. bigger rims (messes up your speedo reading) 2.93 diff. won't really do much d:

[brandon11130]

its all about your differential...think of it this way, having a 3.25 on a ZF tranny is like having a 4.10 with the getrag 260. 80mph at nearly 4k sounds about right. i did 75 at 3.5 and 60 at like 2.8-2.9k.

solution. bigger rims (messes up your speedo reading) 2.93 diff. won't really do much d:

or like having a stock autotragic m20, they are at about 4000 at 80

[e30polak]

Sounds about right. Mine runs at like 3700-3800 round 80 with the same drive-train setup. I'm doing maybe 2900 at 65. This is also due to my 215/45/17 rims.