Wom 0 Report post Posted October 12, 2010 Hi, I recently had a manual conversion done on my E36 323i and now I'm sitting on approx 3200rpm at 100kph. While the quick acceleration is awesome (really really awesome), the car isn't for racing and I'd like to bring the revs down to something that is a bit more economical on the petrol. Just looking for an open diff (as I'm a bit poor after the conversion) and something that will go straight into my car with no modifications. From what I've read online, the auto diff is a 3.64 (for the Jap imports at least) and the factory manual 323i had a 2.93. I want to compromise somewhere in between (ie good acceleration and about 2400rpm at 100kph), so I reckon something in the low 3's would be perfect. Car is a 1996 E36 323i Coupe (pre-facelift) Cheers Quote Share this post Link to post Share on other sites
Ben 0 Report post Posted October 12, 2010 PM'd Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted October 12, 2010 A 3.15:1 will give you 2,600 Rpm @ 100Kph in 5th gear You sure about your diff ratio?? a 3.64:1 should be 3,050Rpm @ 100Kph in 5th gear. I'm assuming you have a gearbox that has a final (5th gear) output ratio of 1:1 and not a .8:1. Also, what size tyres are you running ? Quote Share this post Link to post Share on other sites
Deano 1 Report post Posted October 12, 2010 Hi, I recently had a manual conversion done on my E36 323i and now I'm sitting on approx 3200rpm at 100kph. While the quick acceleration is awesome (really really awesome), the car isn't for racing and I'd like to bring the revs down to something that is a bit more economical on the petrol. Just looking for an open diff (as I'm a bit poor after the conversion) and something that will go straight into my car with no modifications. From what I've read online, the auto diff is a 3.64 (for the Jap imports at least) and the factory manual 323i had a 2.93. I want to compromise somewhere in between (ie good acceleration and about 2400rpm at 100kph), so I reckon something in the low 3's would be perfect. Car is a 1996 E36 323i Coupe (pre-facelift) Cheers I have a 3.45:1 from a NZ new 320i manual $120Cheers Quote Share this post Link to post Share on other sites
HELLBM 1557 Report post Posted October 12, 2010 3.07 medium case could be what you need. Call if required. Regards Ray Quote Share this post Link to post Share on other sites
westy 614 Report post Posted October 12, 2010 ^^Factory NZ new 328 auto ratio. So close to 2.93 as you wouldn't know. ~2500@100kp/h. Quote Share this post Link to post Share on other sites
BM WORLD 1283 Report post Posted October 12, 2010 3.15 or 3.25 is a good option for these models can help Quote Share this post Link to post Share on other sites
CamB 48 Report post Posted October 12, 2010 Well you've got plenty of options there. Who wants to sell me a 3.62, 3.64 or 3.73 large case ring and pinion? Quote Share this post Link to post Share on other sites
Wom 0 Report post Posted October 12, 2010 (edited) A 3.15:1 will give you 2,600 Rpm @ 100Kph in 5th gear You sure about your diff ratio?? a 3.64:1 should be 3,050Rpm @ 100Kph in 5th gear. I'm assuming you have a gearbox that has a final (5th gear) output ratio of 1:1 and not a .8:1. Also, what size tyres are you running ? Not entirely sure, I'm just going by what I've read off the internet for the diff ratios No idea about the final gear sorry Tyres are standard - 225/50/16 3.07 or 3.15 could be the winner Edited October 12, 2010 by Wom Quote Share this post Link to post Share on other sites
Wom 0 Report post Posted October 13, 2010 All sorted, thank you for the replies everyone Quote Share this post Link to post Share on other sites
