did a swap on my 91 civic. threw a D16y8 in it. Now what ECU do i need for it to work? like vtec and everything run properly. the car is a DX automatic. going to stick with the automatic just want a little more power.

Help anyone. Thanks

 

wasting your time with keeping the automatic and trying to get more power cause your not gonna notice any good gains. and also you have a thread going about this and your swap and now you have 2 threads of the same thing

 

You need a P2P ECU. Make sure you wire up VTEC. Make sure the ECU is an automatic ECU. P2P automatic comes in the 96-00 Civic EX automatic. Also make sure to note if the ECU is OBD2a or OBD2b. 96-98 ECUs are OBD2a, 99-00 are OBD2b. There's not much difference between the two beside the fact that the wiring harness is slightly different... at least that's the only difference you need to worry about.


Automatics aren't going to make very much power because they lose way more power through the drivetrain than if you had a manual transmission. This is because of the way a torque converter works, which is what an automatic has instead of a clutch. The torque converter basically pushes fluid to turn the gears inside the transmission. A clutch actually makes creates a physical solid link between the engine and transmission. Also, Honda automatic transmissions are weak and if you give them a lot of power (such as installing a turbo kit), they tend to fail unless built... and building a Honda automatic transmission is no easy task. There is a high lack of parts available for doing so and it will be very expensive compared to a manual transmission. You could try using a ZEX torque converter, that might help a lot.

But if you're just looking for a little bit more power, wiring up VTEC will probably satisfy you, since it is a 128 HP engine and your original engine only makes 70 HP.

 

hey trust he has a 91 civic dpfi and obd0.... to make the d16y8 work and obd2 is gonna cost alot of $$$$$$$ and alot of pain in the butt rewiring and also not to mention that the obd2 requires alot more sensors that the 91 civic is not equipped with.

 

I never said it was going to be easy. And he already put the engine in. Are you suggesting that he quit halfway through what he has already started?

He's gonna need the OBD2 engine harness for the D16Y8 and whatever part of the harness runs to the ECU (i'm not sure if that's part of the engine harness or not?). Then integrate that engine harness into the chassis existing wiring.

 

well the d16y8 has a crank position sensor not a cam position sensor, also the (2)o2 sensors that the obd2 requires plus his car is dpfi and the d16y8 is mpfi. the cost/time/effort to make this swap work is not worth it. i say stop, pull it out sell it and get something alot easier to swap in.... like a dohc zc engine. its a dohc+ its already obd0 + it drops right in, all he will need is to convert from dpfi to mpfi and he will have more power.


sell your motor and get a d16a1 from a 88-89 integra and drop it in and use the ecu. your trans bolts up to it. just rewire your dpfi harness to mpfi
and also if you have a 4 speed trans swap it out for a 5 speed

 

excuse me, I meant to say you should go OBD1 and use a P28 ECU. I don't know why I said OBD2 earlier, it didn't even dawn on me that you could go OBD1. OBD1 requires less sensors and such than OBD2, making the swap much easier. You still need to convert from DPFI to MPFI and wire up VTEC.

That's if you want to keep the Y8. I agree with 94chb that you should get a different engine if you can... and I think you should go with a D16A6. But the swap you already started can be done, it's just going to be more difficult.

 

Just use a jumper harness and plug into a obd1. Now as for post about ecus and their respected year models, i know what the books and articles say but i have a 98 ex with a obd2b from factory. Changing to a programmed obd1 now after installing a stage 2 crower cam.