» Site Navigation | | » Recent Threads | | | 1999 M3 Swap 09-07-2023 10:10 PM 06-01-2024 03:04 PM 7 Replies, 426,515 Views | | | | | | 08-31-2004, 09:09 PM | #1 | I miss my Ti....... :( Join Date: Nov 2003 Location: Los Angeles, CA Posts: 828 | Question 3.73 Diff Is ther anyone out there with a 5spd that did a 3.73 Diff conversion? I would like to know what kind of a gain was seen, and how much top-end was lost? Also did you think it was worht it? -Chad | | | 09-01-2004, 04:15 PM | #2 | Senior Member Join Date: Jun 2003 Location: Toronto Posts: 148 | Tis are limited to 110mph, so top end stayed the same. The RPMs are about 500 higher, and the car definitely has more pick up. If you have an open diff then I would recommened the upgrade, if you have a 3.45LSD then there is no point. SL Quote: Originally Posted by zerog21 Is ther anyone out there with a 5spd that did a 3.73 Diff conversion? I would like to know what kind of a gain was seen, and how much top-end was lost? Also did you think it was worht it? -Chad | __________________ 1996 318ti Active Garrett aspirated... 1996 318ti Sport | | | 09-10-2004, 01:54 AM | #3 | Member Join Date: Jun 2003 Location: Peachtree City, GA USA Posts: 69 | You can acheive the same gearing by switching tires to 205/45-16's. Lowers the car too. __________________ Dave | | | 11-10-2004, 04:12 PM | #4 | Senior Member Join Date: Sep 2004 Location: Manassas, VA Posts: 4,129 | Are you saying that 205/45/16's are smaller in diameter than stock? That would increase the RPMs. What "lowers" the car, bigger wheels or smaller, almost seems like a mind game, when I think about it? Quote: Originally Posted by bmwracefan You can acheive the same gearing by switching tires to 205/45-16's. Lowers the car too. | __________________ 1998 (July) 318ti, 5-spd OEM Armrest Blaupunkt Heidelberg CD50 CD Player/Compact Drive MP3 Player Diamond Audio 5.25" rear speakers Navman ICN 530 GPS BMWALARM.COM (with comfort settings) after market alarm system Magnecor 8.5mm wires M-Z3 Shifter/Momo Knob Burlwood Dashboard Stromung Exhaust X-brace Racing Dynamics Front Strut Bar Carbonio C.A.I. 17" Rial Rims Vader Seats/Heated/Lumbar Support M-tech Steering Wheel/Front Sway Bar/Front & Rear Bumper Depos/w 6500K Angel Eyes/6000K HIDs Clear Corners M3 Mirrors UUC Light Weight Flywheel/M5 Clutch/M3 Clutch Slave E28 3.46 LSD/Mcoupe Cover/E30 Flanges & Halfshafts UUC S.S. Brake/Clutch Lines Hartge Roof Spoiler BavAuto Springs Bilstein Sport Struts/Shocks E46 M3 Rear Shock Mounts SPC Front Camber Kit Reiger Hatch Spoiler BavAuto Rear Camber Kit Dinan Stage II Software Turner Rear Sway Bar Reinforcements BMW E46 Auto dimming mirror with Clown Nose alarm Engine Compartment Light Heated Wiper Fluid Retrofit OEM Fire Extinguisher Da'lan Trailer Hitch Rear Sun Shade OEM Fog Light Retrofit H & R MZ3 Rear Sway Bar/ UUC Adjustable End Links Cruise Control Retrofit On Board Computer Retrofit M3 twistie style side skirts Carbon Fiber Hood | | | 11-10-2004, 04:50 PM | #5 | Senior Member Join Date: Aug 2004 Location: Tyler, TX Posts: 1,022 | Why would it not be worth it to put a 3.73 into a LSD? It seems to me that the smaller gear would be more useful with the added traction that a LSD offers. But with an open diff, then it would just increase tire spin at lower speeds. | | | 12-13-2004, 01:58 AM | #6 | Senior Member Join Date: May 2004 Posts: 411 | Quote: Originally Posted by KIRASIR Tis are limited to 110mph, so top end stayed the same. The RPMs are about 500 higher, and the car definitely has more pick up. If you have an open diff then I would recommened the upgrade, if you have a 3.45LSD then there is no point. SL | 110mph? Are you sure? Ive gona faster then that in my 97 DASC car, with stock ecu. I think it hit a wall of air or limiter at 125 IIRC | | | 12-13-2004, 03:44 AM | #7 | Senior Member Join Date: Dec 2004 Location: Muncie, Indiana Posts: 1,551 | Ok, I have hit 120 with a Dinan Chip, Exhaust, K&N, and 9 lb flywheel, and it wasn't that the car was straining. I have the 3.45 LSD by the way. | | | 12-13-2004, 04:23 AM | #8 | Senior Member Join Date: Aug 2004 Location: Tyler, TX Posts: 1,022 | These numbers are with a redline of 6500, 205/55/15 Gear Top Speed 3.45 129 3.73 119 These are based purely on gear ratios, there are other factors that come into effect, namely wind resistnace. The numbers also change with tire size. If you want to play around with the numbers then go here | | | 12-13-2004, 04:54 AM | #9 | Senior Member Join Date: Dec 2004 Location: Muncie, Indiana Posts: 1,551 | My Ti came will 205/60/15 | | | 12-13-2004, 06:09 AM | #10 | Senior Member Join Date: Aug 2004 Location: Tyler, TX Posts: 1,022 | Quote: Originally Posted by AlaskaBlue My Ti came will 205/60/15 | oops, you're right. I have 205/65/15s and I keep forgetting what they came with stock. So those speeds should be slightly higher, but probably not more that 1 MAYBE 2 mph. | | | 12-14-2004, 04:38 AM | #11 | Senior Member Join Date: Dec 2004 Location: Muncie, Indiana Posts: 1,551 | Can I buy just the rear end gears I want from the dealership? If not where else would I be able to find them? | | | | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |