Stonewall551

So Im doing a JDM B20 Swap in a 2001 Integra. Im getting a pretty clean High Compression B20 (99-00). So what are my ECU options?

Ive done quite a bit of research on this and found out a few things. I just wanted to get a second opinion from people who have done this before...

I imagine the JDM CRV Manual ECU will work in the integra... But for emissions sake, I would like to find a USDM ECU. Would the 37820-PHK-A03 be the one I need to get? And what emission equipment came in the CRV that didnt come in the integra? Just so I can put them back so I dont throw any codes.

And I am aware that I need to splice the wires for the Crank Sensor...

el crapitan

just run your stock ecm and buy an adjustable FPR. bump pressure to 50 psi.

the only input that the b20 HC has that yours doesn't is knock sensor. but it doesn't matter because your ecm will not be looking for it. just leave it unplugged.

and splice the CKF signal, as you know.

a gsr transmission would be great coupled with this engine. keep that in mind

Stonewall551

lol... I would love to get a nice GSR transmission but Importers here tend to sell everything as swap.... Im still looking though

As for bumping fuel with stock ecu... That is my very last option and I really dont want to do it. Id get NepTune before doing that, lol.

HondaPartsHero

Why not just use a 99-01 CRV ECU?

el crapitan

care to elaborate? what's wrong with running the stock ecm?

Stonewall551

This is exactly what I would like to do... I just wanted to know about the different emission systems on the CRV vs Integra so I dont throw a CEL.

Anyone done this before using a USDM ECU?

el crapitan

you didn't answer my question.

Stonewall551

My apologies... The Integra ECU is for a 81mm bore and the B20 is 84mm... Thats a huge difference in terms of tuning necessities and I, personally, dont think running an integra ECU is a good idea. Infact, I would go as far to say that its detrimental and not even safe. Bumping fuel pressure is a very weak band aid, and you'll end up with either super rich spots or lean spots in your "fuel map". An AFC Hack would be a much better fix to just bumping fuel pressure and I think we all know how unreliable that is in itself...

Also there are different variants of the B20 engine... high compression, low compression... and even ones with VTEC sized valves. Its really a very different animal than an Integra Motor.

Needless to say, all of this can be avoided with a simple B20 ECU which is what I want to do... If this doesnt make sense, then chalk it down as a personal preference

el crapitan

i know all about the b20 and the different variations. but a b20 ecm is designed for a light suv, not passenger car. i just think before dismissing it, you should research on the differences between the maps, if you can find that info. you won't know until you research. it may just be that the p75 is a better candidate. or maybe the maps are near identical? who knows?

SHspec

There's high comp, mild comp, low comp. I have the mild comp with the p8r head with LS ecu. Works fine.

el crapitan

see, if i were running the p8r though, i probably wouldn't be running the p75 ecm. i'm sure it runs and works just fine. but it's not utilizing those valves to what it could be

skill178

If you want any Honda motor to run at its best get it professionally dyno tuned, even a bone stock motor in an original car, think.... All of the 01 gsr tegs have the same map but no two motors are the same.

If you are not pleased with the fpr method or crv method, tuning is your only "better" choice.

el crapitan

^^agreed

Stonewall551

I disagree. "No two motors are the same" Please understand that this is referring to modified motors being built with same specs. Too many variables to keep them "Identical". A bone stock motor is a different case. Honda didnt tune each vehicle individually. Its the exact same map on every bone stock car.

Either way, I think Ill be tuning it. Im changing too much to use a stock ecu.
B16 intake manifold, Type R throttle Body, Type R Header and Full Exhaust. Hoping to make 150whp...

el crapitan

why not itr intake? the b16 runners are pretty wimpy. designed for a 1.6. you need as much air as you can get for the 2.0. especially if you'll be tuning. take advantage of that displacement bump

Stonewall551

Well the B16 manifold is free, lol... It was gonna be an LS manifold but free b16 beat it, lol...

el crapitan

you can't fit a pr3(itr/b16) cast mani on a p75 (ls/crv) cast head. for some reason, thought you had a b20v

Stonewall551

No sir, its a stock high compression JDM B20B... Its just a little daily driver Im putting together.

The B16 Manifold should fit... With a few modifications that is.

el crapitan

i know it's a high comp b20b. it's a p75 cast head. same cast as an ls.
and you can make a cavalier intake manifold fit it too...with modification

NeilR7

Not trying to bring up an old thread, but recently I picked up a 97 integra without knowing it had the rare p8r-7 head.

I have stock LS block, gsr tranny, chipped p28 ecu (was tuned by previous owner, stock internals block and head.

I have not lost to a stock GSR yet, for a while I was like damn, this car has to be built and he didn't tell me, nope is all that p8r-7 head. compression is higher than p75 (normal b20 and LS heads), vtec size intake valves (33mm instead of 31),

I haven't dynoed mine, but I read another guy on here had just p8r-7 head wtih b20 block, b18b1 cams... and he made 160 to the wheels just like that, but what you have to realize is this thing is a torque monster, Your torque band is alot wider, I think the b18 block with the p8r-7 head would be perfect for boost.

So a non vtec head that you can swap out your LS head or b20 p75 for at keast a gain of 20+ horse power if done correctly, and no loss of torque/more.

Trying to get people to know more about these heads, hell I didn't even think to look a the stamp on mine till month and a half later when I was like.. alright stock LS shouldn't be this quick ;;

Dude also ran a 13.6 at track with crower 404 cams, ported p8r-7 head flows identical to ported gsr headed until surprisingly about .3 of lift, then the p8r-7 numbers are ahead of the gsr slightly!

Not to mention its fun when dudes try racin you with a gsr or b16vtec... always like na bro i dont got vtec and I dont need it
they so oh yeah sureeee....


Then got beat by a stock non vtecn ls block b20 p8r-7 head....I am in love, just wish more people would get them, not much info. on them compared to everything else. Great power-band with gsr tranny and b18b1 block set up. Can't wait to build.

blackeg

you have a wideband on that? "works fine" with no wideband = oh crap my afr is 13.8-14.0 wot at 4500 rpm with a wideband. trust me ive done it many times before.
the o2 sensor can compensate for the increased displacement of the b20 but on cold starts and wot it is lean

you can fit a b16 manifold on a nonvtec head. you have to cut off the coolant port and thread a barbed fitting into the head, and i think one or 2 of the other bolts need to have to their holes opened up to allow it to line up better. i did it close to 10 years ago by now and its a great mod to do if you dont wanna go aftermarket. i wouldnt get an itr im for a nonvtec the runner length and plenum size combo really doesnt make power over a p30 manifold till over 7000 rpm.

ecu options as i see them:


hondata/neptune. will run the safest on these when properly tuned.
crome/ectune if people still use it i dont hear much anymore
ls ecu with fpr.

i think the crv ecu will code it has some sensors that the integras dont maybe a fuel tank pressure sensor and some other evap crap