Anyone running the B20 w/out VTEC in their ED/EF: what ECU are you using?

I've been researching this swap for a good amount of time, and this is one of the few remaining questions I have.. the more I search, the less confident I feel in the information I've found.

I'm planning on staying OBD0 for now. I'll move to OBD1 when I switch to the VTEC head down the road, but could be convinced otherwise. I guess this ECU question is kind of inseparable from the OBD0/1 question.

The most popular ECU choice seems to be the OBD0 PR4 (90-91 Integra), but I have also seen a few people say they run the stock PM6, and it works fine. I've seen others say this runs the motor terribly. Both make sense to me, so I'm looking for advice from ppl who have experience running one or the other.

Thanks! I'm really taking my time and trying to sort out every detail, and revisit each decision I make to be certain I'm happy with it. I don't like making a decision based on what ONE guy said in some post somewhere.

 

I run a 91 Integra PR4 without any problems for 3 years. I know when I first swapped I ran a 90 PR4 and it threw a check engine light. Not sure of the code, its been so long, but it had to do with the barometric pressure switch. From what I've been told the 90 doesn't have it in the ECU and the 91 does. I was also told if I chipped the 90 it would work just fine.

 

my opinion is to just convert it to OBD1 now since you are already planning on doing it later down the road anyway and you can run a obd1 ls ecu that would probably run it just fine or get a chipped p28 and have a b20 map put on it.

 

Great, thanks for that.. I've not heard that before.

 

Convert to OBDI, run a chipped P28 ECU and disable Vtec. You will have to tune (I did), all the supposed B20 "basemaps" I found on the net were way off. Tuning a stock B20 with a wideband is pretty straightforward.

 

cool, thanks. i'll read a bit more into changing to obd1, I know that it's the best as far as tuning goes, and once I go with a VTEC head there's not really any choice. It doesn't look to be very difficult to do.

But if I stay obd0, it must be the PM4. Nobody has run it with the Si PM6? It seemed a little crazy to me that you could get away with that.

I'm going to be hitting the junkyards this w/e, so I should decide soon. I'll start pulling other parts first if I haven't made up my mind.

 

Exactly. It was Code 13.
The 91 DA has the barometric pressure switch INSIDE the ECU
All other years have it mounted externaly. So as long as you match up the ECU with the proper harness then you shouldnt have an issue.
Im running a 91 motor/tranny/ harnes ect. So i have to have the 91 ECU. 90, 92, 93 can all interchange.

 

I've revisited a few posts I gathered information from before, this one is packed with info:
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/how-build-%22reliable%22-lsvtec-b20vtec-1676914/

Though he's building a VTEC/LSVTEC, a lot of the information applies.

"As for the injectors, contrary to popular belief, ALL Honda B and Dseries motors use the same size injectors (240cc). So, it doesn't matter if you use 92 civic dx injectors or 01 jdm integra type-r injectors, or anything in between, they're all the same size (except i think HF or CX injectors, correct me if I'm wrong)."

So I read this as a suggestion I can actually use the injectors from the D16A6, as replacing them with injectors from an obd0 B18A wouldn't actually change anything. I've seen this in another write-up as well, I just don't remember where.

Then from PGMFI.org (http://wikitest.pgmfi.org/twiki/bin/...oECUChipping):

"...a PM6 (88-91 Civic/CRX Si) ECU is normally used to run a D16A6, ~100HP. By little more than changing the fuel, ignition tables and the revlimiter, a PM6 can run a DOHC ZC, ~135HP, like it came out of the factory. Additionally, little more than even more fuel/ignition map changes and revlimiter changes are all that is needed to make it run a B18A/B18B or a B20B!"

So, if I'm going to chip anything, the PM6 will run the B20 just as well as a PR4. A stock PM6 will probably not run it well at all, though, so I'll abolish that idea from my mind. And I'm assuming that the stock PR4 will run it just fine, as 916MINI has above. If were to go to the trouble of chipping an ECU, it would make more sense to change to OBD1 and run the P28, since that's where I'll end up anyways.

So, does anyone have experience running the OBD0 injectors from the D16A6 (or any other D-series) in the B20Z, to confirm this? Has anyone tried running the B20Z with the PM6, stock or chipped?

Anyone else running the stock PR4 successfully?

Thanks! I'm just trying to be very thorough, as I haven't done a swap before and am trying to follow the 'measure twice, cut once' approach.

 

its not very common that people chip there pm6 and i believe only 90-91 pm6's can be chipped. it would be better to just get a chipped p28 some people sell them here on HT for like 100 bucks.