| Senior Member Join Date: May 2007 Location: LA, Bellflower, CA Posts: 3,613 |
well if you leave the stock auto diff you will be reving high and quick throughout the gears. when i did my swap i used my auto diff for a week or so and i went thru gears like butter. i was in 5th gear just trying to cruise around town and it was at 4k rpm's. Thats why you haven't heard ppl keeping their auto diff on when they do a manual swap.
THERFORE, you need to get a drive shaft from the manual car, ie. manual Z3, ti, coupe, sedan, then get your hands on a diff with a ratio of either 2.93 - 3.73, depending on your liking and goal of your outcome. Lower numbers mean lower rpm's at high speeds and vis versa. and yes you will get a CEL light when you do a swap unless you reset the ECU or something. Tony knows more about it. __________________ 
-Theta Chi-
Float like a cadilac, sting like a BIMMER
.... my socket is just too thick and won't fit in the hole! damnit!
Marv's 332ti is in the werks. Stay tuned ya'll  ...
Check list: S52 swap, manual transmission swap, 3.25 LSD with M Coupe diff cover, SuperSprint muffler, M3 style mirrors, AFE intake, ASC delete, M50 Manifold swap, UUC strut bar, ZHP lighted knob, Vaders, M-tech interior, OEM armrest, AC Schintzer front lip, AC Schnitzer rear spoiler, Roof spoiler, 18'' rims, M3 front drilled brakes, LED interior lights, 3 spoke Euro style steering wheel, OEM roof spoiler and bike holder, Thule fairing, Euro tail lights, oil pressure guage, carbon fiber hood painted to original paint (still showing CF weaving), what's next to do...? |