1987 civic si fuel injection computer help

[dazzlesa]

does anybody have any suggestions about updating or replacing the computer. i need power!

[Ed Funk]

Serra

[bamfp]

SDS(Simple Digital System) Very simple no laptop needed.

[quadzjr]

Not 100 % sure on teh currrent computer rules but are you allowed to convert OB1->OB2 etc.. and run a hondata setup? We gained quite a bit of hp on our prod car with this setup (mostly top end). I am sure that we will implement a similiar setup on our ITA honda.

[gran racing]

Dude, you have enough power.

What ECU is on your car - OBD0? That's what mine is and I believe Matt said we have the same ECU, but am not sure about that.

[quadzjr]

Dude, you have enough power.

Does anybody ever really have enough power

[gran racing]

When he's your competition - yes.

[tom91ita]

i am in the same boat (86 crx si). we are not OBD0. we are have the vacuum advance.

i am assuming that you are also running scca it rules, etc.

i am thinking maybe just do a megasquirt system. i hope to borrow a wide band O2 sensor and do some tests to see how far off i am.

maybe just do the fuel pressure regulator and call it good?

edit: you might look at redpepper as there a few related threads there for megasquirt, etc.

http://www.redpepperracing.com/forum...gasquirt&st=30

http://www.redpepperracing.com/forum...ecu+megasquirt

[quadzjr]

Just to throw it out there, ther are other cheap stand alone systems out there. I used a PE (performance Electronics) unit in a formula car that was suprisingly user frinedly. It is a very small unit and extrmely expandable. You could also use other more expensvie systems like motec..

edit -> abou tthe FP regulator. WE say a bit of gains with increasing the FP bu tit seemed to top out. Even with super high pressures we could not get any advantage from incrasing FP, or chaning timing in conjctuion with the increased FP. I think it has somehting to do with the low speed sampling rate of the stock computer. The dyno plot just flat lined. once we installed the and tuned the Programable computer we were were able to gain a few more ponies.

[dazzlesa]

at the dyno we were able to play with the advance, fuel and timing. matt says we have the same computer. it is a little frustrating getting my ass kicked down straights. it sounds like 2k for a computer, wiring and tunning. kind of steep. obd conversions are a nono for IT.

[quadzjr]

why are they a nono? With the current rules allowing a stand alone engine managment system why would an OBD conversion be illegal?

In efforts to save money.. you may look at http://www.pe-ltd.com/. We plan on running either it or a mega squirt on the MR2.. after we get the quirks worked out of it in the first year or so.

just curious.. What header are you running?

[Xian]

I believe that the "new" ecu rules allow for adding sensors, wiring, and plugs. You can swap the distributor guts but not the distributor housing unless they're exactly the same. If you can pull off an OBD swap within these parameters then you should be good to go.

[quadzjr]

I had a similiar problem with the dist when building the FP motor. come to find out a 92 d15 out of a was the dist for me. I would do some research.. redpepper, hondatech, hondaswap, etc.. somebody must have done it. good luck

[Xian]

For the 88-91 cars there are plenty of OBD-1 distributors that will bolt up and with the proper legal wiring changes work just fine. The trick is that the dist swap isn't legal. Gotta sort a way to swap the guts and that, as they say, is the trick.

[tom91ita]

some of the guts do not need to be swapped since the ignitor is part of the ignition system and does not have to be in the distributor.

but the biggest headache/hurdle imho is the vacuum advance vs. the ecu controlling the timing.

[Tom Blaney]

Rick

You can't get blood from a stone. Throwing big bucks worth of ECU parts isn't going to make it breathe better or optimize friction loss. They may help a built motor work better, and that's part of the overall enging program but yyou still have to build the foundation.

We can chat about options if you like. I need to see more Honda's in the winner's circle.

Tom

[quadzjr]

Rick

You can't get blood from a stone. Throwing big bucks worth of ECU parts isn't going to make it breathe better or optimize friction loss. They may help a built motor work better, and that's part of the overall enging program but yyou still have to build the foundation.

We can chat about options if you like. I need to see more Honda's in the winner's circle.

Tom

I agree..

[dazzlesa]

the motor is 040, new this spring and built my matt kessler. i re did the intake. i want to redo the exhaust. i bought the tranny done with a better final drive and lsd . the injectors need to sent out to check that they are working correctly. i want to improve but i do not want to get fanatical on doing and redoing. the computer seems to be the next area that is holding back some power. the car is handling well now. am i missing something? when it comes to friction are we talking lubricants for the engine tranny and bearings? are we doing balancing to the hubs and axles?
rick

[gran racing]

the computer seems to be the next area that is holding back some power.

I've been looking into the whole ECU thing for a while now, and it isn't going to be easy. When all is said and done, I'm not so sure there's really much to be gained here although I keep finding myself coming back to it. Since we're able to manually control some of the areas already, how much do you think could be gained?

Tom, other than a different engine, I'd be curious to hear what ideas you have in mind for the car.

[quadzjr]

just to quickly comment on you lubricant quesiton and sort of being captain obvoius. You can see small hp gain swhen converting to a light weight "dyno oil". Like royal purples 0W 20. but for continous run time. I noticed a very very slight difference in feel when converting all the fluids over to full sythetics. But I dont' believe the price is worth it for something liek IT racing. But I have heard crazier stories for tp level SM builders. So I guess it depends on what you are going for.