Thread: Coil on plug ....

Ben , do you think that a S13 SR20DET (or any sr20det ecu from a COP car) could be modified to work ? A setup like that plus some COPs from a car (S2000 etc) and a daughterboard for the ECU can make a FWD SR20DE to run sequential COP , right?
If the COPs are from a car (better turn ratio) would it be safe to run them wasted spark? They won't need a CDI box because of the higher turn ratio.

I feel like it would work, but I remember describing something like this a while ago and either Miko or someone else (edit: it was Dave) said it would not work, or be very hard to do. I just can't remember what it was. Maybe I could find it if I searched for it.

Wasted spark would be okay sure. Not sure why you'd do it though.

Right.

If you do find that piece of info about the RWD ECU+LOOM modification , please let me know cause I don't see an obvious reason for it not working.
About the wasted spark - cheap standalone like MegaSquirt could be made to work sequential , but at a higher cost vs wasted spark .But there are guys that make it sequential while cheap , adding extra circuits and boards, while using the MS-Extra firmware.

Do you think that a sequential COP (K20 coils) would be way better than your setup? Will it let you widen the plugs gap to 1.0-1.1mm ?

I think any COP setup is going to better than my current setup. However, I will say my current setup is completely fine for 300+ WHP. I don't know when it would give up, but I'm probably getting close. Proper automotive COP would be way better, and should get you an easy 600+ WHP ignition system. I have 20V COP in my possession right now that I plan on installing at some point soon to "do things right" on my engine.

Okay Cliff an I talk about the possibility of using a RWD ECU for COP starting at post #22 in this thread: http://www.sr20-forum.com/turbo/15285-known-cold-plugs-ngk-bkr7-removable-contact-tip-2.html

I'm still looking for the thread I think I remember though.

Edit: Okay I think I found the thread I was talking about. Dave says it's not going to work easily (because of the COP obviously). So I'm pretty sure there's no major hurdle in making it work. That's assuming the S13 ECU will take input from a FWD CAS and interpret it properly (probably should but you never know).

Here's the thread: http://www.sr20-forum.com/tuning/28489-s13-sr20det-red-top-ecu-b13.html

You may need little stuff like an S13 coolant temp sensor or something like that but it could be done I think.

The s13 ecu and harness should work fine. If your going to go through all the hastle of doing it you might as well tear down the loom, extend and shorten the wires necessary to make for a nice tuck, wire in your power wires where they need to go because our power wires for the injectors, coil, and other sensors come from inside the cab whereas on the rwd sr harness (s13) come from in the engine bay near the passenger side headlight.

So take that harness and shorten it and run it inside and wire into the power clip inside next to the ecu, wire up the interior plug for the coolant temp, tach, and you will need to use your own speedo cable if cable or wire in the speedo sensor wire for those with electric speedos into that harness, wire up all the power wires and you shouldnt have a problem running it.

I believe the rwd CAS disk is the same and both use a 4 wire connector. So that should read just fine. If for some reason there is a problem just find a rwd CAS and swap the disks. But by looking at them they are identical looking.

It really shouldnt be that difficult

Ashton the 50mm RWD and 50mm FWD CAS discs are different.
FWD on left, RWD on right.
Not sure if it matters. It probably does though. And you never know if Nissan put the optical sensor at a different degree on the FWD CAS than on the RWD CAS although by looking at the those two side-by-side and inferring which slot refers to DTC for cylinder #1 I think the optical sensor is in the same place which makes things way easier.

i would love to see a pic of a set up like this.



im just at about 400whp with 100% stock ignition.

i was thinking of maybe throwing in a msd coil down the road.

ill have to do some reading up as im a aft ignition noob.

i remember mannys turbo set up it was nasty !

stratton.

by looking at them it looks as though you can swap them. I believe they both turn the same direction. The s13 ecu will need to read those slots on its own disk. So the disk will need to be swapped. It appears the #1 position is in the same location. Looks like swapping them would work just fine. Again could be wrong but if you want a nice simple cheap way of doing a wire tuck and cop setup, that would be the way to go. You can get the ecu and harness for less than 200 and the coils are dirt cheap as well as the ignitor chip. Thats about all i can think of that would need to be changed.

Oh and the idle air control would need to be rewired using the fwd clips.

From BenFenner

FWD Left and RWD right

You will 100% have to change the disc if you use the RWD ECU. I read an article on why they changed the dsign but I can not remember why.

I think the newer RWD CAS should have the change like the FWD one.