Fuel pump issues, wont stay running, power fc questions questions questions....

[Stripes]

This is a lot to read but I really need your help. Thanks!

Okay so here's the deal. I've got a 93 hatch that I swapped a notch top SR20 into. After I completed the swap and went to start it up the fuel pump was not priming or running at all. So I couldn't figure out why. Relay was good, fuse was good, and there was no wiring involved with the fuse box that I had to splice or anything so I didn't see how that could be the problem. Anyway, I ended up finding that the fuel pump relay ground wire wasn't getting a complete circuit somewhere down the line, so I cut it and grounded it to the chassis and installed a switch so I control when the pump runs. I don't know why it didn't work before and I can not find any wiring schematics involving those wires. If anyone knows that would be awesome.

Problem #2; I've got Sard 550cc injectors with a stock ecu, stock fuel rail and fpr. When I start my car I have to keep on the gas constantly to keep it running and it will not let me rev past 3k. Seemed like a MAF and/or timing issue to me, so I took the MAF off to see if it would make a difference and I still had to keep on the gas to keep it from stalling but it let me rev up to 4k. So then I talked to Brian at MA motor sports and some other people and they all said it could be a MAF issue but there is no way my motor will run properly being un-tuned with 550cc injectors and that is my main problem. The thing is at one point I had my motor idling perfect at 800rpm, so I don't get why it wont do that now.Anyway, I've been told that in order to get it steadily running I will need an aftermarket fuel pressure regulator and something to tune my motor with.

So I'm getting a D-Jetro Power FC and I am wondering if I can write my own air fuel map to get a close enough tune to make my car run steadily. I would just get it tuned at a shop right away but it costs more than what I've got so I figured I could do my own sort of a base tune and then get a shop to fine tune it to perfect everything.

Again, thanks for taking the time to read all of this and I appreciate your help. Thanks!

[Stripes]

Oh and also, are KA and SR fuel rails the same? I'm wondering because I can only find a top feed fuel rail for the SR.

[nzmoman]

Fuel rails, no.

tuning, don't try to MAP tune your car on your own with the D-Jetro. You need to just save up and get it all done at once by a shop.

[fast_s13]

you can tune the power fc if you have a wideband 02 and a little know how

[Stripes]

Well shouldn't the car be able to run without being tuned anyway though? I've got people telling me it won't run or even idle right because my injectors are flooding the cylinders, but I hear about people running un-tuned with bigger injectors all the time. Could it be something else?

[fast_s13]

ppl who run bigger injectors on stock ecu have to have a safc or some kind of tuning tool...you cant just put 550 injectors in your car and think its gonna idle.. it puts almost twice the fuel in the cylinder as stock injectors

[ArmadaJspec]

This link will tell you everything you need to know about the Power FC!

http://paulr33.skylinesaustral...q.htm

[rc1honda]

Yes you have to tune it regaurdless if you have a bigger MAF and bigger injectors otherwise it run rich as **** or you turn the boost up but thats playin with fire. .The D-jetro will run start and idle fine with the maf and injectors. You just have to follow the start up procedrue right. You have to correct your injectors and injector latency (lag time). You divide the old injector size by the new injector size and multiply by 100. So 370/550 * 100=injector correction for each cyclinder so you would put 67% in the correction value for each cylinder. Then you follow the start protocol which is easy. All you do is start and let it run for at least 10 minutes then while still running you turn on the A/C and let it run for 10 more mintes, then you turn on the defroster (full blast BTW) then let it run 10 more minutes. So all in all you let the car run for 30 minutes so that the FC gets used to your engine setup. Then you turn the car off and bingo it should be ready to run. Then all you have to do is tune it. The FC will have a base map ready for the setup you input but you better run stock boost for this. Also it's harder to tuine the d-jetro then the l-jetro so i really don't know if you wanna mess with it plus it takes forever to input each value in all the little cells. It works like a spreadsheet.
Modified by rc1honda at 11:59 AM 1/20/2009