OBD2 TO OBD1 - Honda Prelude Forum

fastfu · 12-05-2004, 05:01 PM

can someone please tell me what parts are needed to convert from OBD1 to OBD2, ive searched about but i cant find any definite answers.

thanks for any help

Paul H22 · 12-05-2004, 05:03 PM

An obd2 to obd1 conversion harness and a obd1 ecu, p27 p72 etc.

fastfu · 12-05-2004, 05:27 PM

i was going to go with a P13 because i want to retain my 4ws

h22 bb6 · 12-05-2004, 06:07 PM

Quote:

Originally Posted by fastfu

can someone please tell me what parts are needed to convert from OBD1 to OBD2, ive searched about but i cant find any definite answers.

thanks for any help

You mean OBD2 to OBD1.

I got foncused when your subject said one thing and your post said another.

fastfu · 12-06-2004, 02:24 AM

yep i mean OBD2 to OBD1

dvsracergirl · 12-06-2004, 12:44 PM

just a harness and a p13...youre good to go.

fastfu · 12-06-2004, 03:36 PM

if i just add a harness and ecu will the car run ok, sorry about all the questions im a bit new to all this

hyper89si · 12-06-2004, 03:42 PM

the car will run fine. you will even get rid of some of those annoying obd2 cel's. i.e. the gas cap pressure. i dont think you can pass emmissions with an obd1 ecu though, so keep your stock one for inspection time.

alvanderp · 12-06-2004, 04:15 PM

I would check to see what kind of injectors you have first, the 4G VTEC injectors were different volume than the 5G's at least here in the US, I know of a person here locally that had all kinds of idle issues from running the P13 on a 5g, even after reflashing the rom and rewriting it himself. You may need to switch to the 4g injectors to make this work, unless the UK Motegi edition uses the same as the JDM motor.

00preludebase · 12-06-2004, 04:17 PM

If you don't mind me asking why go through the hassel of going to OBD1?

hyper89si · 12-06-2004, 06:25 PM

obd1 ecu's can be chipped. (if you want a chipped ecu)

fastfu · 12-07-2004, 05:16 AM

Quote:

Originally Posted by hyper89si

obd1 ecu's can be chipped. (if you want a chipped ecu)

thats exactly why im doing it

dvsracergirl · 12-07-2004, 02:04 PM

youll get rid of a lot of the obd2 issues... you will throw an EGR code tho.

Xx D-MAN xX · 12-08-2004, 01:22 PM

Question, can you switch from ODB2 to OBD1 if your prelude is AT?

Are the P13, P27 or P72 ECU's available for AT?

hyper89si · 12-09-2004, 01:34 AM

Quote:

Originally Posted by dvsracergirl

youll get rid of a lot of the obd2 issues... you will throw an EGR code tho.

is that just on preludes? i went from obd2 to obd1 in my gsr and i didn't throw any codes. in fact it ran better.

dvsracergirl · 12-10-2004, 02:27 PM

yeah just on the ludes....gsrs dont have egr.

i just put a p28 with h22 maps in and took the p13 out....cars running better....i know that wont help with the 4ws for the thread starter....just another option for anyone whose curious.

alphajesse · 12-10-2004, 05:35 PM

All you need to do is add two wires to the harness to eliminate the EGR code.

The difference in injector size is well within the stock ecu's ability to compensate, you will have no problems running a stock p13 on a stock 5th gen.

fastfu · 12-10-2004, 06:17 PM

can you tell use which 2 wires need adding

hyper89si · 12-10-2004, 11:19 PM

Quote:

Originally Posted by alphajesse

All you need to do is add two wires to the harness to eliminate the EGR code.

The difference in injector size is well within the stock ecu's ability to compensate, you will have no problems running a stock p13 on a stock 5th gen.

do you have to do this with the hondata s200 also? i was reading up that if you use a obd1 p72(gsr) with the the s200 it will run fine, also go as far as keeping the dual runners. but they say nothing about the egr code.

edit: unless this is because of the lack of gsr EGR? if this IS the case then why don't he just use a p72 ecu?

-sorry...just a little confused

fastfu · 12-11-2004, 05:51 AM

Quote:

Originally Posted by fastfu

i was going to go with a P13 because i want to retain my 4ws

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