Can someone tell me what the differenc is between a 98 USDM p73 and a 98 JDM p73?
thanks
Matt

 

timing and fuel maps..JDMs have higher compression....

 

Speed limiter

 

The JDM doesn't look for the 2nd 02.

 

VTEC pressure switch

 

Everyone about covered what i had in mind........ummmmmm Yep!!!!

 

calibrated for 100 RON octane (standard JDM fuel).

 

would either ecu work in a 00 civic si with a JDM b18c type r motor?
Matt

 

JDM would work...but Id use a standalone for anything out of the ordinary.

 

USDM ECU would work, but no vtec. Like Mario said, USDM ECU's look for VTEC pressure switch.. JDM ITR motors dont have that on their VTEC solenoids.

solution: get USDM VTEC solenoid, or tap into your JDM VTEC solenoid.. or get a JDM ECU

 

i'm running a USDM P73 with my JDM ITR
cause i used orginal GSR harness which was OBD 2.2
and the JDM P73 ecu was OBD 2.1
couldn't find a harness..didn't feel like hard wiring so got a USDM P73.

Will this hurt the performance of the engine? if so..how? and how do i fix!
Still have the JDM P73 Ecu sitting in my room.
Got around the ICV, knock sensor, second O2, and VTEC oil pressure switch..
was a bi***

 

I dyno'd both on a JDM B18cR. The blue graph is the USDM ECU; The Red graph is the JDM ECU. I was running a stock B18cR with AEM CAI, JDM R header and Comptech exhaust with a Carsound cat. There was very little difference in the numbers but the JDM ECU did yield a little better power. You can see the spike where VTEC kicks in at 5800RPM.

Since my pic isn't showing, at least on my end, the US ECU was 178.3whp and 126.1wtq and the JDM ECU was 178.9whp and 127.7wtq. Very little difference felt on the butt dyno as well. The drastic diff was when I switched out my AEM CAI for my stock box. The stock box robs a lot of power.




**** it's not coming up. If anyone wants to host the dyno email me at garylee333@yahoo.com and I will send it to you. Thanks!

Modified by Gee3 at 11:14 PM 12/16/2003


Modified by Gee3 at 11:17 PM 12/16/2003

 

Here ya go bud...

 

Thanks man! to crXBoy69!

 

thanks for that direct comparison!
makes me feel better that I had to go with the
USDM ecu; now I can seel this JDM one in peace

 

Ummm teh USDM one will look for a Crank fluctuation sensor. which is no tinstalled in teh JDM motros.

 

I actually had the crank fluncation sensor swaped out of GSR onto the JDM..
stupid I know; but the people that did the swap didn't know much and that
was there brillant solution.

 

well would a usdm ecu work in a jdm type r b18c in a 00 civic Si.

THanks for all the help guy
Later

Matt

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by insomniac791 &raquo;</TD></TR><TR><TD CLASS="quote">well would a usdm ecu work in a jdm type r b18c in a 00 civic Si.
</TD></TR></TABLE>

i don't see why not.. the crank fluctuation sensor should be your only issue.. you can either get one and put it on, or get a JDM ecu..

 

ok cool. Well I already have the USDM Ecu. So I am trying to get it to work. For some reason it will only let me rev to 6000rpms would that be because I don't have a crank fluctuation sensor hooked up?
thanks
Matt

 

that i don't know, but it could be a contributing factor..

is the CEL on? check the code if it is.. this could be some sort of safe mode limit, if it is on..

 

would haveing the ecu chipped fix that?

thanks
Matt

 

no idea.. but if you're going that far, might as well just switch ECUs..

 

well I just spent 150 on a usdm ecu. Do you know anybody selling a JDM ecu cheap or someone that wants to trade plus I will give some cash too?
Thanks
Matt

 

i'd run a jumper harness and a chipped p28 will solve everything.
along with a usdm vtec solenoid if your motor is jdm.