I have B16A head with B20B block in my car now. My modification is standard i/h/e, fuel pressure, and Crane Cams coil. Currently I'm running OBD-0 PR3 ECU (came with the engine). Then I met someone seems know a lot about B series engine and he told me I should change to P28 ECU (I think is OBD-1 from Del Sol). He told me by changing the ECU alone I will get better car performance (he mentioned the HP can go up as much as 15HP),is this true? Is it OBD-1 P28 ECU is better then OBD-0 PR3 ECU? If I do change to P28 ECU what parts do I need to change? And do I have to change the wiring completely? Thanks.

 

to use the P28 ECU (which is from 92-95 Civic EX) you would need to convert your engine to OBD1 and get a OBD1 to OBD0 jumper harness for the ECU - converting the engine would require an OBD1 distributor, a 4-wire O2 sensor and you really should swap to the OBD1 injectors, although you wouldn't have to - switching to P28 isn't going to give you any horsepower

 

Ok,thanks. So,what are the advantage P28 compare to PR3?

 

there are none

 

Well I currently have a chipped 0bd1 ecu not in my car and currently using a obd0 ecu. I have a few modes nothing exotic i/h/e/fuel pressure reg./Type R intake manifoled on a B16a. The ecu has 2 muggen chips. I'm affraid if I put it on my Crx that I could potentially lose horse power because the ecu came off a turbo car that needed more fuel and ect. Is this correct?

 

I've never used Turboedit cause I'm OBD 1 so I use CromePRO (and Uberdata in the past). But from what I've read OBD 0 chipped ECU's have lower resolution then OBD 1 ECU's. And also Turboedit has the high cam and low cam on the same map, whereas Crome and UD have a seperate map for high cam and a seperate one for low cam. I cant remember if the TE guys were trying to come up with a fix for this or not, so that they can have seperate fuel and timing maps for high and low cam.

 

I'm not using the chipped obd1 ecu, because I'm affriad that I would suffer power loss due to lack of performance. whats yalls opinion?

 

Well, yes I know that OBD-1 have higher resolution than OBD-0. But compare stock PR3 ECU with P28 ECU, does the P28 make your car performance better (have more HP) considering all the engine setting is the same?

 

If all settings between the your OBD 0 and OBD 1 program being equal one wont be able to make more power then the other. However if the OBD0 setups still only have one combined map for fuel and timing then with the OBD 1 setup you *might* be able to tune for a better VTEC transition. BUt like I mentioned earlier I dont know if Turboedit still has one map for fuel and one for timin or if it now has support for two maps for fuel and 1 for timing (one for high cam, one for low cam).

 

Stick with the ECU that goes to the B16 head, and get it properly tuned by a professional. When you shortcut a shortcut you get nowhere.