The poeple who had/has swapped there diff. did you guys see any decrease of MPG, if so how much?
Do you guys use the car as DD?
98 ///M3 Sedan Club Member #165
Suspension: | H&R Sports | UUC SwayBarbarian | UUC RTAB | UUC Rear Adjustable Control Arms | UUC HD-RSM | Motorsport X-brace | AC Schnitzer Front Strut Brace | Sachs Sport Shocks
Performance: | M50 Manifold | AFE Short Ram | RS Lip Spoiler | Beyern Mesh 18x8.5 18x9.5 | CDV Delete | UUC UDP |
Cosmetic: | ZKW Elipsoids | Predator Chromium Angel Eyes | Prolumen HID LB 6k | Apexcone HID Fogs 5k | ZHP Shift Knob |
Next Upgrade: |UUC FCAB | Erics Vanos | UUC Stage 2 Clutch Kit | UUC SSK | TMS Shorty Headers | HFM 540 | AA Gen3 exhaust | AA Software | or save up and go SC
98 E36 M3 Sedan (Sold)
08 E60 550 M Sport Package (Sold)
12 F10 535 M Sport Package (Sold)
11 F10 550 M Sport Package (Current)
08 E70 X3 3.0si (Current)
97 E36 M3 (Track Car in progress)
Well here is a thought for you. When I went from a 3.23 to a 3.73, I realized that to get the same or better MPG, all I had to do was match the rpm from normal driving with the 3.23 to the normal driving rpm with my 3.73 (although its all highway driving for me). For instance, I used to cruise at 80mph and would be at about 3.5k rpms. Now I cruise at about 72mph to keep the same rpms while also getting the same MPG. Brilliant eh?
Also for city driving, I have actually found myself to be shifting up to 5th gear very quickly since I have short gears and plenty of power so it really doesn't hinder my MPG.
In my opinion, I don't think you will notice that big of a difference with that small of a change in gearing.
I barely noticed an increase when I went from stock to a 3.46
It wasn't until the jump from 3.46 to 3.64 that I saw my gas consumption double without amending my driving habits.
Chris
I recently swapped from a 3.15 to a 3.46 and noticed no difference.. between 280 and 320 miles to a tank depending on how i drive..
96 320i Touring
98 Z3 2.8 Roadster
01 PY M Coupe
96 Z3 1.9 - DASC
95 318ti Clubsport
94 Miata M-Edition
13 smart fortwo
I haven't noticed a difference with my MPG. I think it would have to do more with where you let your engine stay at rpm wise more than what gears you have.
thx for the info guys. Im planning to buy a 3.46 in the near future.
98 ///M3 Sedan Club Member #165
Suspension: | H&R Sports | UUC SwayBarbarian | UUC RTAB | UUC Rear Adjustable Control Arms | UUC HD-RSM | Motorsport X-brace | AC Schnitzer Front Strut Brace | Sachs Sport Shocks
Performance: | M50 Manifold | AFE Short Ram | RS Lip Spoiler | Beyern Mesh 18x8.5 18x9.5 | CDV Delete | UUC UDP |
Cosmetic: | ZKW Elipsoids | Predator Chromium Angel Eyes | Prolumen HID LB 6k | Apexcone HID Fogs 5k | ZHP Shift Knob |
Next Upgrade: |UUC FCAB | Erics Vanos | UUC Stage 2 Clutch Kit | UUC SSK | TMS Shorty Headers | HFM 540 | AA Gen3 exhaust | AA Software | or save up and go SC
Buy mine binh. It's fs
'99 Estoril Blue + Dove Grey ///M3 coupe
'04 Jet Black + Cinnamon ///M3 coupe
98 ///M3 Sedan Club Member #165
Suspension: | H&R Sports | UUC SwayBarbarian | UUC RTAB | UUC Rear Adjustable Control Arms | UUC HD-RSM | Motorsport X-brace | AC Schnitzer Front Strut Brace | Sachs Sport Shocks
Performance: | M50 Manifold | AFE Short Ram | RS Lip Spoiler | Beyern Mesh 18x8.5 18x9.5 | CDV Delete | UUC UDP |
Cosmetic: | ZKW Elipsoids | Predator Chromium Angel Eyes | Prolumen HID LB 6k | Apexcone HID Fogs 5k | ZHP Shift Knob |
Next Upgrade: |UUC FCAB | Erics Vanos | UUC Stage 2 Clutch Kit | UUC SSK | TMS Shorty Headers | HFM 540 | AA Gen3 exhaust | AA Software | or save up and go SC
LSD. Worth a shot!
'99 Estoril Blue + Dove Grey ///M3 coupe
'04 Jet Black + Cinnamon ///M3 coupe
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