does anyone know what the difference is between these two ecu's?

 

damn speed limit!

BTW: i want to buy a USDM ecu. ill trade my jdm one for a usdm

 

is that the only difference, or are there differences in emissions stuff?

 

it probably has a slightly different fuel map because the jdm is tuned to 200hp with 10:1 compression and the usdm is 190 with 10.6:1

edited for retardedness.


Modified by puffxy at 11:48 PM 10/18/2004

 

the jdm has 10.6:1 and the usdm has 10.0:1 and many jdm ecus differ in that they have no ATM pressure reading, due to the vast elevation changes in the US many of the usdm ecus have that

 

jdm- speed governor, a bit stronger fuel/timing maps (so i've heard), easier to chip/reprogram, preferred for swaps.


usdm- no speed governor, harder to chip/reprogram (so i've heard)


a good person to ask on this one would be Katman.

 

there ar eslight differences in fuel and ingition but not enough to really be noticeable. they use a different barometric presssure sensor and the JDM ecu has a speed limiter.

and they are equally difficult or easy to rechip or program. i have 3 program for the usdm ecu and 3 for the jdm.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by puffxy &raquo;</TD></TR><TR><TD CLASS="quote">it probably has a slightly different fuel map because the jdm is tuned to 200hp with 11:1 compression and the usdm is 190 with 10.6:1 </TD></TR></TABLE>

I was thinking the same thing except JDM 10.6:1 USDM 10:1

 

oh snap, sorry heads on the wrong way today.

 

jdm ecu will be tuned off of higher octane gas.

 

But is the any visual Difference. like how to tell USDM and JDM

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Elkins911 &raquo;</TD></TR><TR><TD CLASS="quote">damn speed limit!

BTW: i want to buy a USDM ecu. ill trade my jdm one for a usdm</TD></TR></TABLE>

i got a jdm p13 and don't know if it come with speedlimiter because i sometimes hit over 140mph. it might be usdm but i doubt it because i bought it from a guy that has a complete h22 jdm swap. btw, how can you tell if it is usdm or jdm?

 

What would the speed limit be then? 145?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ludedude48 &raquo;</TD></TR><TR><TD CLASS="quote">What would the speed limit be then? 145?</TD></TR></TABLE>

normally, it should be at 110 max.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lakerschamp2000 &raquo;</TD></TR><TR><TD CLASS="quote">

normally, it should be at 110 max. </TD></TR></TABLE>

no the speed limit is 120 mph

The only way to tell I think is when you open it there should be a chip on the outer edge of the board that is not found on the usdm. Ill see if I can find pics.

 

heres are pictures of the differences in the jdm and usdm. not my pics so I cannot verify. this is only for the p13. I do have a jdm ecu my speed cut off is 117-118



also there is some info adout the resistors right infront of that board that tells you if its a jdm or usdm but from the pictures I looked at the info contradicted it self

hope this helps.

also does anyone have a usdm p13 they want to trade for my jdm p13. I dont like the speed limiter. I can go faster in my h23 w/f series tranny then I ever could with the h22 swap because of the p13.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">heres are pictures of the differences in the jdm and usdm. not my pics so I cannot verify. this is only for the p13. I do have a jdm ecu my speed cut off is 117-118

also there is some info adout the resistors right infront of that board that tells you if its a jdm or usdm but from the pictures I looked at the info contradicted it self

hope this helps.

also does anyone have a usdm p13 they want to trade for my jdm p13. I dont like the speed limiter. I can go faster in my h23 w/f series tranny then I ever could with the h22 swap because of the p13.</TD></TR></TABLE>

no matter what you will be able to go faster w/ f series tranny because of the longer gears than u can with an h22 tranny, and 118 is plenty fast for you, are u topping out at the track??? i doubt it, stay under 100 on the streets/fwy...at least, and im sure this last post of yours will get this locked

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twistedbydezign &raquo;</TD></TR><TR><TD CLASS="quote">

no matter what you will be able to go faster w/ f series tranny because of the longer gears than u can with an h22 tranny, and 118 is plenty fast for you, are u topping out at the track??? i doubt it, stay under 100 on the streets/fwy...at least, and im sure this last post of yours will get this locked</TD></TR></TABLE>

I agree you should never go that fast on the streets. Also remember tire's are very important at those speed get a good z rated tire. DONT endanger other people’s lives with your stupidity, Do it when no one is around at night in a deserted road and kill yourself not others. I personally would never take a prelude over 120; let’s face it there not stable at very high speeds. My vette was an other story.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">heres are pictures of the differences in the jdm and usdm. not my pics so I cannot verify. this is only for the p13. I do have a jdm ecu my speed cut off is 117-118



</TD></TR></TABLE>

You beat me to it

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twistedbydezign &raquo;</TD></TR><TR><TD CLASS="quote">

no matter what you will be able to go faster w/ f series tranny because of the longer gears than u can with an h22 tranny, and 118 is plenty fast for you, are u topping out at the track??? i doubt it, stay under 100 on the streets/fwy...at least, and im sure this last post of yours will get this locked</TD></TR></TABLE>

I understand how trannys work but no matter what tranny you have if your ecu has a speed limiter your car will not go faster then that. Thats why my car goes faster (top speed) with the h23 then h22.

But anyway this post isnt about me and how fast I can go. and what I should and should not do. Its about the info I posted ie the only one to show pictures of how to visually tell the difference between the jdm and usdm p13. sorry if I offended anyone.

 

Oh man kulrevon thanks man. been looking for that long time.

 

How would a 4W Steering ECU affect the car if it was put in a 2W steering car?

 

you would get 4ws codes I actually dont think you have a light so maybe you wouldnt get 4ws codes. and Im not sure if it would do anything its just a p14 or p13 maybe (jdm) I believe with extras for the 4ws. why would you need to put a 4ws in a 2ws car?

 

Well when I got my swap that's the ECU they gave me, I have been running it in my car and was wondering if it would alter any performance. I haven't gotten any cells but just wanted to make sure.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">you would get 4ws codes I actually don't think you have a light so maybe you wouldn't get 4ws codes. and Im not sure if it would do anything its just a p14 or p13 maybe (jdm) I believe with extras for the 4ws. why would you need to put a 4ws in a 2ws car?</TD></TR></TABLE>

 

now i realize that i have a usdm ecu, guy that sold to me said it was jdm. i hit 145mph, no wonder it was usdm

 

does a usdm p13 ecu h22 vtec works for a jdm h22a engine ?