P13 in a 5th gen - Does it work?

Supercharged 無限MUGEN BB1 Profile · Post by **nucleustylzlude** » Wed Jun 17, 2015 9:16 am

Hey guys,

I'm trying to help a forum member from France who wants to potentially buy one of my chips, see posts here:

http://www.ludegeneration.co.uk/prelude ... postingbox

I should probably know the answer as someone tried this a while back – Mills?

The main question is:

Will a 4th gen ECU – JDM or UKDM (shouldn’t make a difference) work on a 5th gen H22A5? Assuming he has a OBD2A to OBD1 conversion harness.

He has a 5th gen which was originally a 2.0i and has swapped the engine for a 5th gen H22A5. He also has a spare UKDM (Or France Domestic Market in this case) G00 ECU which can be chipped with one of my maps, but I’m not sure if this would work.

Anyone remember what has been tried previously? I don’t want to sell him a chip if it doesn’t work.

Thanks,

Rob

Post by **Merlin** » Wed Jun 17, 2015 9:20 am

Mills tried it in his 5th gen SIR, it did not work.

mills wrote:

so the results

not good at the moment plugged in the P13, started up the Lude and the check engine light came on, and its also idling a bit lower. when giving it a gentle press on the pedal to bring the revs up a bit, it seems to be a bit hesitant and spluttery. so now i need to pull the codes, as it could be a problem thats easily rectified

anyway, took it for a steady drive up the road, and it drives fine. but on the way back down, i thought i would plant it a little, to see how it goes and more importantly to see if the VTEC crossover had changed at all unfortunatley there is no VTEC and it feels underpowered. could the car have gone into safe mode

thats it for now until i manage to pull the codes.

mills wrote:i was a bit gutted today when i found out the chipped ECU didnt work

http://preludeuk.forumup.com/viewtopic. ... =preludeuk

Supercharged 無限MUGEN BB1 Profile · Post by **nucleustylzlude** » Wed Jun 17, 2015 9:42 am

Well found bud - my search skills on here failed miserably.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Jun 17, 2015 10:37 am

Why doesn't it work though?

I'm confused about that...

Post by **Vtecmec** » Wed Jun 17, 2015 10:39 am

Yeah, I'd have thought it would work too.

Supercharged 無限MUGEN BB1 Profile · Post by **nucleustylzlude** » Wed Jun 17, 2015 12:54 pm

I figured the same, which is why we tried it with Mills way back when. As to why it doesn’t = ???

It could be something to do with the P13 code, I know the clever developers that built the Crome Software didn’t fully crack the P13 codebase as it was different from the usual P28, P30, P72, P06, etc from Civic, CRXs, Tegs, etc. This explains why these ECUs work with a Crome chip and conversion harness. But we were essentially trying a standard P13 ECU, with a standard code map (albeit tweaked by Spoon). There must be something in the detail but its way beyond my knowledge and understanding.

Post by **Vtecmec** » Wed Jun 17, 2015 2:14 pm

I wonder what the code was? I can only think knock sensor issue or that the parameters of one or some the 5th gen sensors are different to the 4th?

Post by **newkid** » Wed Jun 17, 2015 2:26 pm

Injectors run differently and crank position sensor. Cant remember which way but one is peak and hold and other is saturated yes?

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Wed Jun 17, 2015 2:57 pm

so if that's the difference, then swapping the injectors for 4th gen ones (would need to change the loom/plugs) would mean that a chipped 4th gen ECU should work?

Post by **newkid** » Wed Jun 17, 2015 3:22 pm

All needs changed to obd1 from memory. Oil pump too i think. Alot of hassle for a p13.