Just want to be sure. No plans for vtec yet so I assume this ecu is the best one to get.

 

Are you doing all wheel drive like the CRV? I believe the TCM is built into the ECU. As well, are you redoing your dash harness to match up with CRV wiring including the CRV ICU and any other CRV bits and pieces.

You are saying A03 so sounds like it's a manual fwd drive only crv (haven't seen myself) so it's all the wiring and bits and pieces inside (like ICU) that you are concerned with.

 

dang I didn’t know about that so what the hell is the best ecu for it? I’m not going awd I would do p75 but I want the B20 running at its best.

 

OBD1 chipped and tuned is how you run it best.

 

so an obd1 p75 with a b20 base map?

 

Yeah, that's pretty close. Still better to get it tuned though. Basemap is technically just a starting point. Tuning it will get you running optimally because even B20B's differ from motor to motor.

But yeah, I'm doing the same thing, running a stock Z6 basemap on my Z6 swapped motor. It runs pretty decently overall, but I do know if I got a tune, it would be dialed in to near perfection.

 

TCM doesn't matter on a manual transmission or 2WD vs AWD. Computer has no idea there is an AWD system.

 

Yeah I realized he stated a manual ECU. I also do not believe there is a manual AWD CR-V. I believe all the AWD CR-V's are automatic.

But I do know the ICU has different wiring than the civics and I believe there are other tidbits. Not sure if cruise control is similar or different, I know rear wiper is different at least to the 5th gen. No clue on 6th gen. And what I don't know is what parts run from ECU through things like the ICU or cruise control.

Rear wiper I believe is totally separate. The point I was making is you would have to check out the cabin wiring to see what is and is not affected for the civic to run a CR-V ecu.

 

I'll have to go look at the part number, but I ran a CRV manual ecu in my B20 swap with no issue at all. The ECU connectors were identical.

 

Mine is a phk-a02

 

There was a 5 speed manual AWD CR-V clear up to 2006. And the Element same engine and transmission clear up to 2011. They are stupid rare and most have been cannibalized for parts in AWD swaps.

 

They were cable shifted on the B-series iirc

 

It's actually the other way around. The manual CR-Vs were only available in 4WD. 2WDs were all auto.

So, I tried to run a PHK ecu on my (at the time) lightly modded B20Z and it mostly works. AF ratio was fine at wot and drivability was fine. The issue I ran into, I think, is that the CR-V injectors are very different from the typical 240cc B series injectors and I suspect that the dead times are very different. This manifested in the thing running very lean at low loads/throttle angles even with the fuel term trims jacking up. Like, chewed up a set of spark plugs in 1000 miles lean. The trims were calmer as I applied more load. So my theory is that the PHK injectors have lower latency and the calibration in the PHK ecu is able to command shorter pulses at idle/low throttle/low load. Just a theory though, I didn't do enough messing around to really figure it out. Just ran it long enough to set all the readiness monitors, smog the thing, and put my P28/Demon back in. I've looked at the PHK injectors and I just can't see a way of making them work on the B18B style manifold. I maight take another stab at it or I might just get a P75 ecu, disable the Immobilizer and carry on for smog this summer.

 

I didn't get into all that at the time, but I used the B20 injectors.

 

So how does that work then. I thought the CR-V is not full time AWD and instead only puts 4wd in when slipping etc. If it isn't using a TCM to control it all, how is it transferring power to the back in a manual setup?

 

The same way it does in the automatic. Hydraulic pumps and clutch plates in the rear differential. A difference in speed between input and output builds fluid pressure and squeezes on the clutches. Purely mechanical. Rear ends are the same part numbers between manual and autos.

 

Yeah the rt4wd is all mechanical.