ECU Discussion

[THE ONE]

We have been having members on here with a lot of ecu issues so I thought I would start a discussion on it.

Note: anything that is not on topic will be deleted in this thread.

I'll start off with some basics

92-96 Preludes have a P13 ecu. Both in The U.S. and Japan.
97-01 Preludes have a P5P ecu. Both in the U.S. and Japan.

h22a OBDI ecu is a P13 ecu
h22a OBDII ecus are P5P and P5S (if I remember correctly the P5S ecu is from the H23 EUDM obd2 accord and the prelude type s).


The Prelude SI that have H23 in them have a P14 ECU; and cannot be used with a vtec engine. So if you have a prelude SI and you've done or planning a h22 swap you need to get the p13 ecu. The P14 will not work.


Now for other options. There are some of you (most if not all) that when you do an engine swap you want to get the best bang for your buck with ecus. There are other choices you can consider aswell.

If you have a H22 you can choose from :
P72,P28,P30,P61,P08J,P30J,P72J,p06

If you have a h23 none vtec you can choose from:
P74,P75,P06,PR4,P72,P28,P30,P61,P08J,P30J,P72J

NOTE: These ecus must be chipped with a H22 map in order to work properly with the h22 or h23 ecus. They have way different maps and timing on these ecus are drastically different as well. So running them unchipped is not a good idea.


T.E.L.
Ace.

PS. I would love to have the infomation on the second and third gen ecu's aswell.

[InvaderTrax]

Just to add:

You can use a P14 ECU with a JDM F22B, but you'll need to install a knock sensor, and you'll run a little rich. Also, you can run an H22 with a P14, but you won't have VTEC, so it's not a good idea unless you really need to

[hotrod]

good job! rep to joo.

[jdm bb6]

You must spread some Reputation around before giving it to TopEndLude again.

^^^ thats what i got when i tried to give you a rep point... the system is against you TEL !!!

[hotrod]

that's cuz you need to give me some rep. :p

[jdm bb6]

WHORES DONT GET A SECOND CHANCE !!!


alright you win

[FLaVaH 0wnz]

i have a p14 and a p13 harness problem with my p13 is that its cut from the firewall so what i wanted to do was use my p14 harness and wire the vtec in myself but the p14 harness has a lot more sensors than my p13 so im phukt =/

[THE ONE]

I so forgot about this thread. Flavah you still need help wiring vtec?

[mckillio]

Does ATTS get turned off when you switch ECU's?

[THE ONE]

if you're not using the sh ecu then yes it will turn off.

[mckillio]

So switching to a p72 or p28 it would shut off?

[kizzzzle]

Ya I have a similar question. I have an 01 SH and have a VAFC right now which rely limits my tuning capability's. Say I am decently modified and want a rely good tune but dont want to go hondata cuz it disables my ATTS. Basically what I am asking is what exactly should I do for the best tune without disabling ATTS. I am decently modified and staying N/A.

[Brash22]

VAFC, AFC Neo or Emanage would do the trick.

[kizzzzle]

I have a VAFC now do these other products offer for more "tunability" than it. My knowledge of tuning is pretty limited to any input on this subject would help.

[THE ONE]

So switching to a p72 or p28 it would shut off?

yes

I have a VAFC now do these other products offer for more "tunability" than it. My knowledge of tuning is pretty limited to any input on this subject would help.

I'd suggest keeping the vafc. To me it doesn't make sense to change to another one that does basically the same thing...

[98vtec]

add the p06 to the list of ecu's. It is a p28 board, minus the vtec components. you can convert it to vtec.

[THE ONE]

I'll add to to the vtec list.

[kizzzzle]

So I am pretty much screwed when it comes to tuning?

[THE ONE]

yes basically lol... believe or not your the first sh owner who has ever posted it like that so far lol.

[R8GYY]

http://www.greddy.com/products/display/?Category=electronics&SubCategory=48

e-manage is the way to go.

[mizlude]

^^^^^e-manage is a pain in the ass and doesnt work right for me.

[R8GYY]

^^^^^e-manage is a pain in the ass and doesnt work right for me.

give the blue one a go...they are the best for jap cars

[THE ONE]

^^^^^e-manage is a pain in the ass and doesnt work right for me.

listen to this guy.

[BadMofo]

Yeah man, short of the OBD-I w/ tuning soft/hardware... you might as well stick with VAFC... E-Manage is too damn expensive for me to justify buying it for myself at least. (I'm in your boat as well, with a Type SH... I'm not going back to OBD-I until I am ready to Delete my ATTS, or until I'm ready to swap a base motor/tranny in)

[R8GYY]

Yeah man, short of the OBD-I w/ tuning soft/hardware... you might as well stick with VAFC... E-Manage is too damn expensive for me to justify buying it for myself at least. (I'm in your boat as well, with a Type SH... I'm not going back to OBD-I until I am ready to Delete my ATTS, or until I'm ready to swap a base motor/tranny in)

think of it as a long term investment...it will come in useful if you decide to do other mods like boost and nos in the future

[BadMofo]

think of it as a long term investment...it will come in useful if you decide to do other mods like boost and nos in the future

Yeah... but I loose my ATTS function (without loosing the ATTS's weight) in the meantime, and to be honest with you, I have no need to do an OBD-I tune until I do extensive modification... It doesn't justify me loosing my ATTS and it's complete overkill for the I/H/E that I'll be running between now and when I'm ready to build my motor.

Same with the E-manage... I'm not spending that kind of money to tune for I/H/E.

[Si Speed]

All I know is the man who can make an ATTS compatible OBD1 ECU of some kind will be very much loved. I can only imagine what it would take to do that though.

[gmoney]

hey guys... i"m running obd 1 p28 chipped on my prelude.. would going with an aem ecu be the best idea, becuase my turbo feels like its breaking up, not catching.

[kizzzzle]

So E-manage doesnt delete ATTS and allows for quite a bit of tunability. I am pretty far past the I/H/E mods so do you think it would be a good investment?

[THE ONE]

The blue box.. yeah sure, it's just like a vafc. the black box (ultimate), I wouldn't get that. Too many horror stories about that one.

[twokexlv6coupe]

hey guys... i"m running obd 1 p28 chipped on my prelude.. would going with an aem ecu be the best idea, becuase my turbo feels like its breaking up, not catching.


get it tuned by chris harris of xenocron, he's somewhere in bergen county (i think bloomfield?) he's known to be one of the best tuners in the country, and he did my car too.

[BadMofo]

The blue box.. yeah sure, it's just like a vafc. the black box (ultimate), I wouldn't get that. Too many horror stories about that one.

Can't it also tune timing maps? That's pretty much it's biggest advantage over vafc IMO.

[gmoney]

ok, thanks for the advice

[THE ONE]

Can't it also tune timing maps? That's pretty much it's biggest advantage over vafc IMO.

naw.. the blue box does not tune timing. only the black box...

[gmoney]

i thought you dont have to tune the aem computer???

[THE ONE]

i thought you dont have to tune the aem computer???

yes you do. HAVE TO tune it!

[BadMofo]

naw.. the blue box does not tune timing. only the black box...

GReddy’s e-Manage is a cost effective programmable engine management system that allows you to properly tune your factory engine control without having to change the entire factory ECU system to an expensive "stand-alone" unit or the inconvenience of sending it out for a full ECU reprogram. The e-Manage system is a true universal "piggy-back" type unit that taps into most Japanese factory ECU wiring, by utilizing the vehicle’s existing sensors (or optional upgraded sensors if factory sensors are maxed out). The major benefit is the factory ECU settings become your "Base-MAP" for tuning. There is no need for extensive tuning for normal driving conditions, but does allow the tuner to fine tune, adjust for injector changes, and add new MAP(s) for situations the factory ECU is not capable of (like on-boost conditions). And as technological breakthroughs are achieved, we offer FREE updates via our greddy.com website’s Tech page. Basic functions will allow the tuner to slightly alter factory injector duty-cycle (± 20% at 5 preset RPM points) by intercepting and altering airflow or MAP sensor signals. An option for Honda VTEC cars will allow you to even adjust the VTEC shift point. Additional features are built into the system but are only accessible through the use of the e0-1, PRofec e-01 programmer or our PC-Windows based "e-Manage Support Tool" communication software (sold separately). There is a 16x16 airflow adjustment map, a maximum 50% larger main injector correction adjustment, upgrade air flow meter adjustment, boost limiter cut, anti-engine stall, VTEC-fuel adjustment, real-time map trace, real-time display, real-time communication and basic Data-logging. With the use of our "Optional Injector Harness" and the software, the unit has the ability to control an additional 16x16 injector duty cycle map and the controls for adding up to 2 additional sub-injectors. If the "Optional Ignition Harness" and the software are used the unit has the ability to control a 16x16 ignition timing map. All of the above maps can also be map-traced in real-time as well. If the factory range of map or airflow meter is surpassed, you can incorporate a larger airflow meter or our "Optional GReddy Pressure Sensor and Pressure Harness" to set larger scales of adjustment. All installation and tuning should only be made by a trained technician with proper air/fuel monitoring tools. (Some or all functions may not be compatible with some applications.)

[BadMofo]

Not to drag up a dead thread... but does anyone have any more information about the point I brought up in my last post? It appears the Greddy e-manage (the blue one... not the ultimate) does have the ability to adjust ignition timing now... anyone ever done this? or know wnayone who has?

I'd be VERY interested in this over a VAFC when it comes time to tune my SH...

[THE ONE]

GReddy’s e-Manage is a cost effective programmable engine management system that allows you to properly tune your factory engine control without having to change the entire factory ECU system to an expensive "stand-alone" unit or the inconvenience of sending it out for a full ECU reprogram. The e-Manage system is a true universal "piggy-back" type unit that taps into most Japanese factory ECU wiring, by utilizing the vehicle’s existing sensors (or optional upgraded sensors if factory sensors are maxed out). The major benefit is the factory ECU settings become your "Base-MAP" for tuning. There is no need for extensive tuning for normal driving conditions, but does allow the tuner to fine tune, adjust for injector changes, and add new MAP(s) for situations the factory ECU is not capable of (like on-boost conditions). And as technological breakthroughs are achieved, we offer FREE updates via our greddy.com website’s Tech page. Basic functions will allow the tuner to slightly alter factory injector duty-cycle (± 20% at 5 preset RPM points) by intercepting and altering airflow or MAP sensor signals. An option for Honda VTEC cars will allow you to even adjust the VTEC shift point. Additional features are built into the system but are only accessible through the use of the e0-1, PRofec e-01 programmer or our PC-Windows based "e-Manage Support Tool" communication software (sold separately). There is a 16x16 airflow adjustment map, a maximum 50% larger main injector correction adjustment, upgrade air flow meter adjustment, boost limiter cut, anti-engine stall, VTEC-fuel adjustment, real-time map trace, real-time display, real-time communication and basic Data-logging. With the use of our "Optional Injector Harness" and the software, the unit has the ability to control an additional 16x16 injector duty cycle map and the controls for adding up to 2 additional sub-injectors. If the "Optional Ignition Harness" and the software are used the unit has the ability to control a 16x16 ignition timing map. All of the above maps can also be map-traced in real-time as well. If the factory range of map or airflow meter is surpassed, you can incorporate a larger airflow meter or our "Optional GReddy Pressure Sensor and Pressure Harness" to set larger scales of adjustment. All installation and tuning should only be made by a trained technician with proper air/fuel monitoring tools. (Some or all functions may not be compatible with some applications.)

I've never heard of a blue box tuning timing. that's why most people get the vafc. that would be something nice to research ;)

[BadMofo]

I may look into that... that would be a great solution for SH owners who don't want to lose their ATTS function. Maybe I will call them when I get a chance.

[THE ONE]

I'm pretty sure the blue box does not tune time. Otherwise they wouldn't have made the black box which indeed does tune timing.