obd1 or obd2 - Honda Prelude Forum

rooneyrocket · 01-22-2010, 02:12 AM

ive a wee problem at the moment, deciding which ecu to use when i do my auto to manual conversion. ive heard you cant use a spoon chip to delimit the obd2 but it works with the obd1. any suggestions

merlinbadman · 01-22-2010, 04:38 AM

Get a P28 or P72 with an OBDII -> OBDI conversion harness and your set

Prelude1897 · 01-22-2010, 08:30 AM

Quote:

Originally Posted by merlinbadman

Get a P28 or P72 with an OBDII -> OBDI conversion harness and your set

plus have the ECU chipped and tuned

rooneyrocket · 01-22-2010, 12:15 PM

well ive a p13 and a think it has a spoon chip in it

2000h22a · 01-22-2010, 12:27 PM

those chips are worthless, get a p72 if you want the butterfly valve in your intake manifold to work, I would go obd1 but youll have trouble getting an inspection sticker since it wont link up the the inspection computer

rooneyrocket · 01-23-2010, 02:42 AM

where could i get my hands on a p72 and whats the retail on them

00CDMLUDER · 01-24-2010, 03:45 PM

You should be able to find one on a local car forum or someone at an import shop should be able to get their hands on them for u quite easily.. Around here the go for $50-100 ..I got mine for 50.. make sure its a virgin ecu (never been opened or chipped) and then have your shop chip it and tune it for ya... If u have emissions where u live...well get a p.o. box where they dont have em haha

Sol Badguy · 02-08-2010, 03:23 PM

Any reason why the OBD1 p13 wouldnt work without being chipped and tuned if the motor is stock OBD2a???

bouckarooo · 02-08-2010, 06:32 PM

the base maps are different from the p72 to the p13. int he end you are better off with a p72 or an aftermarket ecu replacement(aem, greddy, motec....etc.) if you are chipping with a hondata just know that you can only have one set tune/map at a time.(this may be fine for you depending on what your setup is and what you intentions are for the car)

rooneyrocket · 02-09-2010, 01:42 AM

you cant chip an obd2 ecu use have to use obd1 as i have been told as im doing this convo myself once you change ecu's you have to change lnjectors as they are bigger for the 4thgen so ive been told

yargnitram · 02-09-2010, 02:47 AM

is the 5th gen standard 18 pin obd 2 plug or is it special also there seem to be a special paper clip type connection according to the workshop manual where do i get one of these

bouckarooo · 02-09-2010, 06:10 PM

Quote:

Originally Posted by rooneyrocket

you cant chip an obd2 ecu use have to use obd1 as i have been told as im doing this convo myself once you change ecu's you have to change lnjectors as they are bigger for the 4thgen so ive been told

the injectors are not bigger, they are just a diffferent type. the 5th gen injectors are saturated type and the 4th gen /jdm injectors are peak and hold.

rooneyrocket · 02-10-2010, 02:06 AM

350 saturated, 275 peak and hold

2low · 02-10-2010, 02:16 AM

I'd just use the p5m just change the immobilizer chip from your auto to a manual p5m. (in my opinion)

sjdrees982 · 05-04-2010, 11:02 PM

late reply i know....but looking at doing the same thing for my 98 base - just want to confirm if anyone can help, looking to get an OBD1 P72 Virgin, and ship to JDM**** for Mugen chip/tune w/ OBD2->OBD1 conversion harness - car is already registered at a drop location in northern WI (no emissions)......anyone who's done this can you confirm my train of thought is correct - anyone see a problem? Any help/feedback would be much appreciated before I shell out the $$ and find out it won't work. Thanks!