new member new bike need some tech help/ advice

[natemoen]

I just gotta ask, why go through all the hassle of this instead of just buying a newer bike that comes with what you want? Especially with the "lots of time and no money" thing. It's going to take time and money to change over to efi on it, just ask the guys that have done it already.

Either way, I think you need to pm someone who has done this and get some details from them.

[proddy2008]

Well i do have a newer bike its a project though thats the fun of it

[natemoen]

Ok, just askin. Just wondering.

[proddy2008]

Np man i am kinda new to bikes as far as projects go thats y i ank so many q's expecialy when noone has done it yet

[natemoen]

Sometimes it easier to know goals/end desire when giving advice. And like I stated earlier on in the thread there are several people that have done the efi conversion. If you find a post by 81xsproject there is a link in his signature line to the thread following his process of converting his xs to efi.

[proddy2008]

Yep but im tryin to go a step further and hav cop

[cywelchjr]

Yep but im tryin to go a step further and hav cop

Trying to what? The guys who have done the mod have switched to both EFI and electronically controlled ignition as well.

As for the wasted spark thing, most systems other than V8's have gone to wasted spark. It requires fewer coils for the number of cylinders, and nothing is really "wasted" it's just that one of the sparks is firing on the exhaust stroke while the paired cylinder is firing on the compression stroke. As I understand it, wasted spark or not is determined by engine and crank design. To accomplish what your outlining, would likely require 1.5 - 2 times the cost of the conversions already done, and would require more parts and complexity to that can fail. As it is, I'm not sure you could fit 4 coils under the tank anyways. Current conversion have been in the $1000 range cost wise, and as I understand it, that is based on doing it as cheaply as it could be done, you may be talking about $2000 by the time you get done, and you will have added at least one additional place for oil to leak as well, plus have added an ugly wart to the side of the head as well.

Most EFI systems try to make things as simple as they can get, thus the move to wasted spark, since you have to cylinders that fire 180 from each other, you only need to worry about 2 timing events per rotation, and they each cause a cylinder to fire on an opposite rotation.

It would be really easy if it was not perfect to cause additional vibration by having the timing events for the pair cylinders not precisely in sync with each other.

[proddy2008]

Coil on plug like an ls engine the ls2 coils are some of the best out there you just need crank and cam sensors to run cop im going to try to find A zshop in houston to extend the cam out and tap holes for a ls1 cam gear to get signal it won't be to big of a problem as far as oil leaking I just have to get the right measurements for a seal my goal is to have fun building the bike and doing it egvsactly the way I want it btw cop is a big improvement over wasted spark at higher rpm because the coils have more time to saturate and cool down not to mention using ls2 coils gives a LOT more spark energy also if they do fail their only 22 bucks each so np

[cywelchjr]

I think the idea is cool but it might be wasted on these engines as without some custom head work (specifically on the valve springs) your not likely to get much if any higher than stock redline naturally aspirated. The problem is that the valves are going to float on you, and IIRC it was determined by someone pretty knowledgeable on here that just stiffer springs wouldn't fix that, but that they needed redesigned springs.

I wouldn't thing that wasted spark would lose anything by 8500-9000 on a 4 cylinder anyways. Of course cop would certainly get rid of any problems with plug wires (my 98 passport had cop and I admit I did like it). Don't get me wrong, it does sound like a cool idea, but with you saying you have more time than money, this may take multiple years to accomplish see as there would be considerable fabrication work needed.

Something else to consider, if you put something on the end of the cam, you might end up with it interfering with your leg there, these things are pretty wide. Not sure how else you could get where your trying to go though. I know that others have done EFI and even used GM stuff with the MS setup, but they didn't do cop but stuck with the wasted spark system. I'm wondering too how the fuel pump your thinking of compares to the busa pump on current draw, as these things don't have much to spare (although going to all LED lights and HID headlamp may give you enough breathing room).

[proddy2008]

thx for your time posting its about to be the oposite though lots of money no time cuz I'm geting. Deployed lol true wasted spark probably won't loose anything but it won't have 120 mv even at low rpm

[proddy2008]

Finaly off work now as far as interfeiring with my footing the cam gear from an ls1 is only a coouple of inches diameter also I'm going with the cafe racer theme so my feet won't be around there I haven't realy looked at the draw of diferent current draws of fuel pumps just psi and gpm ratings lol

[natemoen]

You only have 24 amps total to work with if everything is working properly and in tip top shape and most of that is already used up by ignition and lighting as it is.

[proddy2008]

Holy **** thats not much im not used to working with less than 90 minimum let me do some research now on current draw of different components im gessing no altenator upgrade available"

[natemoen]

Well if you use the XJ alt then you can get 26 amps....other than that no.

[proddy2008]

Dam well it will be tight the coils draw 10 amps for 8 of em so 5 amps for 4 just gotta find out head/ taillights and blinkers and horn... anything im forgeting? Oh yeah the ms and fuel pump