Honda ECU on Toyota?
 

so i might get flamed, but... a honda friend of mine suggested that i look into using a honda ecu... the thought was that i could easily burn eproms and tune it that way, where as toyota ecus arent as easy... im thinking in regards to a ae86, turbo set up... let me hear your thoughts?

fire away...

I guess it could work if you pull every sensor and wiring harness related to the ecu out, if your thinking just pull the chips and swap them it WONT work. But wouldn't it be easier just to megasquirt it?

thiers been a couple guys with MR2s thats done it with success. Google it

Have they have any driveability problems?

splice the wires

???

It can be done.....it's a lot of work.

ive heard of people doing this on the 88-91 celica all tracs

they're doing it on nissans now too.

i believe i was the second to install a honda ECU on a 3SGTE. dustin, from lacrosse was the first. we took slightly different approaches.

every sensor is compatible, though you do have to install an IAT sensor.

the throttle position sensors have different scales. the toyota sensor scale isn't as steep, so throttle deltas don't register as well with the honda ECU. doesn't do ---- at anything but coming off idle. there's a bit of on-off at very low throttle angles, but there are two ways to deal with it-

1. opamp circuit to add ~20% gain to the TPS output.
2. turn the TPS up so it reads ~.5v at idle. most of the nastyness goes away.

if it means anything, it's been over 2 years since i installed the honda ECU on my MR2 and it hasn't bothered me enough to build the opamp circuit to fix it properly.

now, all that said, the car is SO much more driveable than it ever was with the toyota ECU. throttle response is better, low end torque is better (i've tuned it for lean spool). it makes more power at 12psi than it ever did at 16 on the stock ECU.

work is a relative term. my airflow meter died on a saturday afternoon. the car fired up on the honda ECU monday morning.


here are the pinouts for the 3SGTE to honda: http://www.apexology.com/files/sche...TE_to_PGMFI.xls

the 4AGE will be slightly different, but a lot of the terms are interchangeable.

a few of the differences are:

FC = fuel control. honda calls this the "fuel pump relay" pin. toyota calls the fuel pump relay the "circuit opening relay."

Ne is the 24 tooth reluctor in the distributor. CKP-P is its equivalent.

CKP-M, CYP-M and TDC-M are connected to ground as soon as they enter the ECU, so it is possible to combine them at the distributor to simplify the wiring. i don't know about the 4AGE, but the 3SGTE has 4 connections at the distributor which is all you need if you combine the VR sensor grounds. my car is wired this way, and it has no issues with noise.

dizzy modifications:
http://img.photobucket.com/albums/v7...rementstop.jpg
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since the dizzy spins backwards, you need to line the CYP sensor up so that the signal occurs between TDCs of cylinders 3 and 4 for the reverse rotation. i forget off the top of my head how it changes, but i think it's like 180* out of phase or soemthing like that.


Attachment 7300
Attachment 7301

$4 GM oil vapor separator catch can from a quad 4:
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I am interested in this also as I am turboing a 4AGZE (converted to strictly turbo) in a 86 MR2.

Which Honda ECU would be best? Also are you using crome or another tune set-up?

i'm using crome. if i had the spare $$ i'd be using ectune, hands down.

i'm using a P75 with the VTEC and IAB bits added. i use the P72 code base so i can control the TVIS. any chippable OBD1 ECU will do though. P06s are usually the cheapest.

I am going to PM you scarecrow.

the wiring diagram link is ooc, can you please repost a new link?

cool can you duplicate the adapter from honda dizzy to mr2?

been there and done it already
ae86 4age powered honda ems
custom dizzy adaptor
http://h.imagehost.org/0224/P1010460.jpg

whoaaa thats some serious frankinstein stuff there....very complex...

the wiring was tricky... most of the sensor are honda but a few of them are toyota
the last thing i need to figure out is the vss.
but over this winter it is gonna be boosted
log manifold, 20g turbo, evo8 bov, ebay fmic, boost here i come

it run and drive i would agree it idle better then the stock toyota ems

the only honda sensor on mine is the IAT. everything else is toyota. if you have a car that already has a toyota VSS, it it will drive the honda ECU just fine, as they use the same pulse rate. you just need to change the gear values in the software.

this.

toyota's engine management in the early 90's sucked. anything with a flapper door AFM drives like ass compared to equivalent PGMFI-controlled engines. even with the car half tuned, it drove so much better than the stock ECU it was like a different car.

from day one when i started it up, i was surprising that it started and drove ok w/ a stock 92 honda accord ecu now its way better on a po6 w/ crome

honda ecu
 

ive done it. runs very well.

Sorry for digging up an old thread.
I want to know what extra sensors do I need to run honda ecu on 4age blacktop? Can I use stock toyota sensors?