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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-05-2016, 03:30 PM   #1
CarbonZHP
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Ratios for Manual Swapping a ZHP

Im finally seriously looking for a 5 speed swap full kit for the E46. I was originally going to keep the stock diff, but the ZHP Auto is a whopping 3.64, so can't keep that around. I do primarily city driving, with occasional 1 hour drives out of LA. Do you guys think the diff from the auto 330 (3.38) or the auto 323,328,325 (3.46) will be the better choice?
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Old 01-05-2016, 03:33 PM   #2
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3.07 iirc.. why 5 speed? do 6
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Old 01-05-2016, 03:34 PM   #3
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Quite a bit more expensive and rare.

Doing some more calculations, if I get an M3 6 speed, I could keep the stock 3.64 diff, hit 67 in second, and cruise at 70mph at 2700RPM. Seems pretty perfect
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Old 01-05-2016, 04:37 PM   #4
TerraPhantm
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FYI, ZHP convertibles didn't come with the 3.64; they had the 3.38 like other 330s
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Old 01-05-2016, 04:50 PM   #5
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Originally Posted by TerraPhantm View Post
FYI, ZHP convertibles didn't come with the 3.64; they had the 3.38 like other 330s
I've read that nowhere. Here is the reference list of all transmissions and ratios. 3.64
http://www.bokchoys.com/differential/GearRatios.htm

Edit: Reading the longwinded thread on Mafia right now
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Old 01-05-2016, 05:07 PM   #6
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So looks like I'd be safe with the 5 speed with my existing diff, which for vert ZHP is apparently 3.38. 6 speed would only give me another gear on top, but is the premium for a lower freeway RPM worth the premium? Not sure on that.
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Old 01-05-2016, 06:00 PM   #7
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Do your cost effective 5 speed swap with your current diff,.........then reassess as needed.



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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 01-05-2016, 06:01 PM   #8
CarbonZHP
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Do your cost effective 5 speed swap with your current diff,.........then reassess as needed.



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I already know what you want to say about diffs Rob lol
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Old 01-05-2016, 06:05 PM   #9
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 SCCA
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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