My e30 318is s52 swap thread

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  • windsor318is
    replied
    heres a couple things i did, carbon cluster and chrom rings, i was going to paint the needles red, you guys think nail polish or paint marker? i was going to ditch the white faces, yay or nay?also the fuel pressure regulator that i havent mounted yet. for those that asked about the exhaust pics, ill have the car on the hoist again this week, ill snap some.

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  • windsor318is
    replied
    Originally posted by BigD
    I dunno, depends how much boost you're gonna run. I'd still get the 3.25, it's a really nice final gear for this car (with the ZF), makes the gears the perfect length, not boggy but you also don't have to row your ass off.
    im going to search for the 3.25, now that i no what it came in. i think i might start a diff collection! i dunno D i kinda liked driving at 60km in 4th gear and still having balls galore, but ill see what i can find first, i think i might show at importfest with my pink paint!

    Matt(racersmarket) technical question for you, a friend of mine keeps babbling that your chip might be the reason im lean, or his theory is that the computer "thinks" its running lean as my gauge shows and dumping fuel to compensate. the only thing that could tell the ECU that its running lean would be the o2 no??? im starting to think that its because of my o2 positioning inside the header, should i relocate it to see, or do you know for a fact that someone has run the o2 inthe header with no problem.

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  • BigD
    replied
    Originally posted by windsor318is
    so basically...........get a 2.93lsd lol
    I dunno, depends how much boost you're gonna run. I'd still get the 3.25, it's a really nice final gear for this car (with the ZF), makes the gears the perfect length, not boggy but you also don't have to row your ass off.

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  • e30serg
    replied
    Heh. It makes for fun reading right?... right? :D

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  • 318isbmw
    replied
    Originally posted by e30serg
    Oh crap-sorry for the off-topic! Yeah, sounds like a 4.10 would be too low. I'm going with a 3.25lsd myself. They're found on e28 535is'. Swap the cover and output flanges and you're good to go.
    Keep the old output flanges if you want to use the bigger half-shafts out of a z3 (I think?)
    Hopefully someone will read it and learn something new from one of us's posts as we went back and forth :D
    I'd like to think we contributed something, in a very roundabout way

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  • e30serg
    replied
    Oh crap-sorry for the off-topic! Yeah, sounds like a 4.10 would be too low. I'm going with a 3.25lsd myself. They're found on e28 535is'. Swap the cover and output flanges and you're good to go.
    Keep the old output flanges if you want to use the bigger half-shafts out of a z3 (I think?)

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  • 318isbmw
    replied
    Originally posted by e30serg
    Actually, with a more aggressive, lower gear, the driveshaft would turn MORE times per 1 revolution of tire. 3.25 means that the driveshaft would turn 3.25 times for 1 revolution of tire. 3.46 means that the DS would turn 3.46 revs for 1 rev of tire.

    We're talking about e30polak right? He has a 3.25 and was wondering about using a 3.46 to gain some acceleration. He would gain some, but if he didn't really car about high rpm's he should use a 3.73.
    Yes your right, I spaced on the 3.25 vs 3.46.

    e30polak was randomly throwing a question into this thread which we were talking about the gearing of a zf who just finished his swap and noticed the 4.10 is way too low and we were discussing 3.25 putting into because he has no overdrive gears and therefore a 1:1 5th gear.

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  • e30serg
    replied
    Originally posted by 318isbmw
    Sorry I said higher rather than lower, I apologize.
    No worries.

    Originally posted by 318isbmw
    Next time your working under your car, spin the driveshaft and count how many spins it has to one revolution of the tire. If you change to a more agressive(lower) gear it will be less revolutions of the driveshaft to one revolution of the tire(edit: I believe, its been ages since I used that test for gearing in hotrods). I said it was closer to 1:1 with a 3:46 than it was w/ a 3:23 with what I just said about the spins of the driveshaft in terms of the tire revolutions.
    Actually, with a more aggressive, lower gear, the driveshaft would turn MORE times per 1 revolution of tire. 3.25 means that the driveshaft would turn 3.25 times for 1 revolution of tire. 3.46 means that the DS would turn 3.46 revs for 1 rev of tire.

    Originally posted by 318isbmw
    BTW, you can't do this test with it in gear, unless you do it with it in gear and running, which would be plain stupid, so therefore your little argument about gearing in the transmission just doesn't make sense with what I was saying.
    OK.

    Originally posted by 318isbmw
    Also, the reason we're talking about this is because he has a 4.10 and its too agressive with his 1:1 5th gear, so really, the 3:25 he was talking about wanting to use, is the correct gearing and we're arguing for no reason...
    We're talking about e30polak right? He has a 3.25 and was wondering about using a 3.46 to gain some acceleration. He would gain some, but if he didn't really car about high rpm's he should use a 3.73.

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  • 318isbmw
    replied
    Originally posted by e30serg
    This is wrong, plain and simple. a 3.46 compared to a 3.25 is LOWER and I'm not sure what you mean by "closer to 1:1 ratio". This means nothing to me. Your wheels will only see the same amount of torque your engine is putting out (1:1) if your transmission ratio is at 1:1 (5th gear in a ZF) and your diff ratio is also 1:1 (never).
    Sorry I said higher rather than lower, I apologize.

    Next time your working under your car, spin the driveshaft and count how many spins it has to one revolution of the tire. If you change to a more agressive(lower) gear it will be less revolutions of the driveshaft to one revolution of the tire(edit: I believe, its been ages since I used that test for gearing in hotrods). I said it was closer to 1:1 with a 3:46 than it was w/ a 3:23 with what I just said about the spins of the driveshaft in terms of the tire revolutions.
    BTW, you can't do this test with it in gear, unless you do it with it in gear and running, which would be plain stupid, so therefore your little argument about gearing in the transmission just doesn't make sense with what I was saying.

    Also, the reason we're talking about this is because he has a 4.10 and its too agressive with his 1:1 5th gear, so really, the 3:25 he was talking about wanting to use, is the correct gearing and we're arguing for no reason...
    Last edited by 318isbmw; 07-23-2008, 01:52 PM.

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  • e30serg
    replied
    No no no! a 2.93lsd would make you a dog off the line. If you want to take off fast, get a 4.10! or a 3.73.
    Hell, get a few different ratios, try them out, sell the rest.

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  • windsor318is
    replied
    so basically...........get a 2.93lsd lol

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  • e30serg
    replied
    Yep-I guess "torque multiplier" is not a very popular term. Just trying to inform people man. Not trying to be a dick. I hate to see misinformation being thrown around.

    Btw, those are pretty cool tools!

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  • e30serg
    replied
    Originally posted by 318isbmw
    A taller ratio like 3.46 means that the user is closer to a 1:1 ratio in the rear end, and thus for one rotation of the driveshaft is less of a rotation in the tires.
    This is wrong, plain and simple. a 3.46 compared to a 3.25 is LOWER and I'm not sure what you mean by "closer to 1:1 ratio". This means nothing to me. Your wheels will only see the same amount of torque your engine is putting out (1:1) if your transmission ratio is at 1:1 (5th gear in a ZF) and your diff ratio is also 1:1 (never).

    Originally posted by 318isbmw
    The torque is all the same, that's all within the motors, and the rpm's are all the same, that's within the ecu that determines the redline.
    This is true. The torque the motor makes stays constant and the ecu determines the redline. I didn't mean to say that changing the final drive gear ratio would somehow increase the redline. It only increases the RPM of the engine at a given speed. For example:

    at 80mph with the 3.25 ratio, lets say he spins at 3500 RPM
    at 80mph with the 3.46 ratio, he would spin 6% faster, 3710 RPM

    Did you bother to read the articles?

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  • 318isbmw
    replied
    Also, torque multiplier was a new term, so I did a few searches, all I got was a torque multiplier wrench... Its a series of torque wrenches used to of course, increase torque.
    Torque Multiplier
    Torque Multiplier Info

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  • 318isbmw
    replied
    Originally posted by e30serg
    You guys are not understanding what I'm saying. The torque# that I wrote in is AT THE WHEELS.

    Ever heard for the term "Torque multiplier"? aka transmission, aka final drive?

    The gear ratios in transmissions and final drives DO multiply the torque that is put out by the engine. That is why putting a lower ratio (numerically higher) final drive makes your car take-off faster. This is the increased in torque that is making your car accelerate faster.

    The downside of low gears is a higher RPM at the same road speed.

    I know that the torque an engine puts out cannot be increased by changing the gears. However, the torque AT THE WHEELS CAN be increased by changing the gear ratios.

    Btw, LOW gears are numerically higher, and HIGH gears are numerically lower.

    4.10 = super low
    3.73 = low
    3.46 = higher than 3.73
    3.25 = higher than 3.46

    Read for a bit and get back to me:



    http://www.blueink.com/CLASS/physcom1/gear.htm
    Pretty sure we're misunderstanding eachother. You never did mention you were meaning at the wheels the torque was changing, merely said the torque is changing. Big difference there... As I said earlier, the gears merely change how it gets to the ground.

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