HEY GUYS, I POSTED SOMETHING ABOUT TWO WEEKS AGO REGARDING THIS CONVERSION AND DIDNT GET MUCH HELP SO IM BACK WITH A FEW MORE QUESTIONS... HOPEFULLY SOMEBODY CAN ANSWER THIS FOR ME...
I HAVE A COMPLETE SI HARNESS AND ECU, AS WELL AS THE INTAKE MANIFOLD AND INJECTORS, AND THE DIZZY... HERES THE QUESTION, IS IT ALL BASICALLY PLUG AND PLAY OR WHAT??? I KEEP HEARING DIFFERENT THINGS AND IM GETTING CONFUSED! IM CONVERTING MY STOCK D15B2 FROM DPFI TO MPFI... PLEASE HELP IF YOU CAN!
THANKS

 

there are plenty of guides online. try searching google...

also, try not typing in caps.

 

yea thats a great idea! however ive already searched google and other sites and cant quite get a clear picture of what to do!
thanks!
and look... no more CAPS!!!

 

you need to use your engine harness and make the DPFI to MPFI wiring changes to it - you cannot use the Si engine harness, other than to rob the connectors from

 

even if im using the Si ecu? and what mods will i have to make to the existing harness if i cant use the Si harness???
i really appreciate your help

 

check your Instant Messages

 

basically all you can use the si harness for is for parts. the only connectors you will need is fro the distributor and the imjectors. gotta run 4 wires, 2 for the injectors and 2 for the crank angle sensor in the dsitrbutor. swap 2 wires at the ecu. add in the resistor box and your done. oh yeah i did have to lengthen a few wires but i went from d to b so idk if youll have to or not. i also recommend putting in a connector for the 4 wires you need to run just incase you; decide to pull the mnotor out later with the wiring harness on the motor. i always use the left over connector from the dpfi distrbutor plug to make that connectorion at the firewall. take your time and solder and heatshrink the wires. make it look clean

 

read up on the dpfi---->mpfi swap guide
http://effinmotorworks.com/Effin_MPFI_swap.htm

 

You can use the SI harness if you want to. I've done it couple times. Just that you have to run couple more wires. The reverse lights and Ignitor wire are on the wrong side of the Si harness and have to be jumped over. But, I would personally convert the original harness.

 

You cant hook up a si harness to the DX harness.The swap is very easy to do the dpfi to mpfi. I did mine my self and was very easy. Just make sure you read every thing and understand the directions and TAKE YOUR TIME.

 

ok thanks so much for that info you emailed me. its very helpful... one more question though... if im using the Si ecu, can i use the Si harness or??? thats the only thing im still not clear on.

 

si ecu will plug intro the dx ecu harness no problem

 

all these questions are answered in the faq thread under dpfi-mpfi swap . theres 6 write ups i think.. the 4gen write up has the most pictures that can help alot.