Boost Junky 1 Report post Posted January 26, 2009 Hey people, Does anyone know what parts I would need to setup a waste spark system on my M50B25 motor. Want to do away with the individual coil packs. I know I need individual leads but am insure if I can use the same coil drivers as what the RB's use to covert to waste spark. Maybe the commodore coil packs? Have googled and looked on bimmerforum and e30tech and various others but cannot find alot Cheers, Luke Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted January 26, 2009 (edited) Why? (foot in mouth) Yes they are sequential ..six drivers for coils & injectors...god knows what I was thinking about What are you trying to achieve ?? Edited January 26, 2009 by *Glenn* Quote Share this post Link to post Share on other sites
Mike 1 Report post Posted January 26, 2009 Why? M50 is already wasted spark. 3 drivers in the DME for spark & injectors 1 & 6 are paired 2 & 5 3 & 4 What are you trying to achieve ?? hmmm, learn something every day, I'd always thought it was sequentional fuel and spark for some reason. Quote Share this post Link to post Share on other sites
320guy 0 Report post Posted January 26, 2009 I thought it was sequenital spark and fuel aswell, pull the cam sensor and it will run waste fire. Quote Share this post Link to post Share on other sites
|ncary 0 Report post Posted January 26, 2009 Individual coil packs > 3 coil packs firing wasted-ly half the time > distributor. Why would pull an Chrysler/GM and step back through technology? Quote Share this post Link to post Share on other sites
Boost Junky 1 Report post Posted January 26, 2009 Why? M50 is already wasted spark. 3 drivers in the DME for spark & injectors 1 & 6 are paired 2 & 5 3 & 4 What are you trying to achieve ?? I was leaning more towards the reliability of individual coil packs, but i supose my coil packs havnt packed out YET. I just want to make sure i can cover as much things as possible before I take her to get the link installed and tuned, narrow down as many possibilities as possible that could causeme to have to take the car away again and come pack to pay for more dyno time. I've seen a few, more descent turbo setups on M50's on BimmerForums with waste spark setups. They must have a reason for doing it. Wether its the fact that the M50 is not already wasted spark firing or due to the reliability of the coil packs? Luke Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted January 26, 2009 (edited) I was leaning more towards the reliability of individual coil packs, but i supose my coil packs havnt packed out YET. I just want to make sure i can cover as much things as possible before I take her to get the link installed and tuned, narrow down as many possibilities as possible that could causeme to have to take the car away again and come pack to pay for more dyno time. I've seen a few, more descent turbo setups on M50's on BimmerForums with waste spark setups. They must have a reason for doing it. Wether its the fact that the M50 is not already wasted spark firing or due to the reliability of the coil packs? Luke I'd rather have coil over, than deal with leads. Maybe their reasoning was to go higher voltage. And if its not broken..why fix it, unless you have a sound reason for doing it, 2nd hand coils arent expensive and you wouldnt have to retune just because you changed a coil once its set up. I think you would have more issues long term using externally mounted coil packs with leads. Thats why most manufacturers have gone to coil over....no more leads Edited January 26, 2009 by *Glenn* Quote Share this post Link to post Share on other sites
Boost Junky 1 Report post Posted January 26, 2009 Oh so they use wastespark due to the fact they get a stronger spark? I always thought it was because of reliability. Well that sways me back towards keeping the individual coils, Cheers Glenn. Luke Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted January 26, 2009 Oh so they use wastespark due to the fact they get a stronger spark? I always thought it was because of reliability. Well that sways me back towards keeping the individual coils, Cheers Glenn. Luke No, what I was saying was maybe thats the reason for it...I'm not sure. When I get time I'm going to try and find out Quote Share this post Link to post Share on other sites
E30-323ti 66 Report post Posted January 26, 2009 It is more of a heat management issue on FI engines. The coils break down with the heat (very common on RB's). Leads are cheaper and serviceable. Do the BMW coils have the ignitor on top of each coil? Or separate/in the DME? Using a aftermarket CDI or high power ignitor often mean OEM coils can't be used, and generic twin post bosch coils are often used. Upgraded ignitors are often needed to get a strong spark with a decent plug gap & cold plugs when running higher boost (+20psi). I wouldn't go down the path unless you really needed to!! Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted January 26, 2009 (edited) Switching is via the DME's 6 drivers. The coils have three wires power, earth and trigger wire. The DME switching will only handle the resistance that the OEM coils have. Any coil used must be of the same resistance Edited January 26, 2009 by *Glenn* Quote Share this post Link to post Share on other sites
*Glenn* 854 Report post Posted January 26, 2009 Why? (foot in mouth) Yes they are sequential ..six drivers for coils & injectors...god knows what I was thinking about What are you trying to achieve ?? Edit: My foot hurts my mouth Quote Share this post Link to post Share on other sites
