My question is; what are the diffrences between the 10.6:1 compression SiR-G motor and the usdm gsr motor. Could it be true that this extra compression and higher hp rating are due to minor diffrences in the face of the pistons? Or could it just be a slightly diffrent 'ecu' with japanese premium 93 octane? *scratches head in bewilderment* Are all S-80's created equal???? I think not> what are the real diffrences?? I seek JDM knowledge attn all JDM gods enlighten me your with great Honda wisdom.

What year p72ecu would perform best with a 96'SiR-G

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Silver EJ\ 96'SiR-G, rsr exhaust, jdm itr intake box, and was running an obd-1 p-72, the car now sits at Inline 4 anxiously awaits new tuning





Modified by SilverejSi-R_g at 5:20 PM 11/22/2004

 

Bump......who

 

difference is because of pistons

 

......then the jdm p-72 has diffrent mapping than a usdm p72?
How can you get it to run right on us 91 octane ? Im converting to an obd 2 set up on my sir-g hoping that it might help everything??? what can i do on a obd2 set-up to further aid the 10.6:1 cuz it cant be running that compression on 91 octane and a us p72????????????

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilverejSi-R_g &raquo;</TD></TR><TR><TD CLASS="quote">10.6:1 cuz it cant be running that compression on 91 octane and a us p72????????????
</TD></TR></TABLE>

You should be fine with that on 91

 

agreed.i have that set up in my civic and i use 91 octane with no problem whatsoever

 

i have the sir-g motor as well, but I only use 92-93 octane just to be safe (i'm also using a jdm p72 ecu) & i'm not sure about the pistons being any different from the usdm b18c1. i never heard that before..

 

Thanks for the info... then i can conclude that until all JDM tech specs are met on the b18c it will not put the 178 crank hp because it wants JDM gas/pcm. Hmmmmmmmm intresting, Also, does anyone know exactally what p72-2 stamped on my head means(SiR-g). I have a 99 integ in my garage and it says p72-1 stamped on the head. are any of the ports on the b18c modified? Are there any changes to lift or duration???And why the hell would anyone buy an american Honda motor???????

Nice car alex-very impressive i hope i can get my dc2 that far someday


Modified by SilverejSi-R_g at 1:46 PM 11/22/2004

 

the JDM B18C has higher compression and uses slightly more aggressive fuel maps in the ECU to get the higher bhp figure. I had an Integra Si-VTEC (1994 model with dual round lights) and with just an exhaust (and 17s) and on our regular 95ron gas made 178.9bhp at the wheels (and the car was 8 years old at the time and had about 80k on the motor) If i had used our 98 super unleaded gas i possibly would have hit over 180bhp and with 100ron 1 or 2 bhp more possibly. The P72-1 on the head is the head type. ITRs have a P3 head the same head as the B16A but ported/polished. All B18C integras (Si-VTEC/SiR/SiR-G) had the P72 head.

 

So on my SiR-g it would best to run a jdm\obd2 p72 rather than a us\obd2 p72?
Can you modify fuel delivery on a obd1 p72 to modify mapping\timing??? How do you modify fuel maps without disrupting default fuel trim levels?

DOES anyone know where i can find a jdm p72??????????????
.


Modified by SilverejSi-R_g at 6:10 PM 11/22/2004

 

you just answered your own qeury. why would you choose to use a usdm with less agressive fuel mapping on a JDM block, which gains its power from high compression and agressive fuel mapping. 91 is fine but you'll make more powa with the 93.

black on black, white on white, JDM on JDM. whatever floats your boat.

modifying fuel maps is esentially distrupting trim levels, if some1 can inform me and the rest of us how to do this plz, this would be informative for the future

 

Does anyone know where i can get a JDM p72???I also heard that jdm ecu's are smaller is this true?

 

try http://www.passwordjdm.com

https://honda-tech.com/zerothread?id=1014714 and check that out for more info on jdm ecu's

 

Only some jdm ecu's are smaller. For instance, the jdm p13's are the same size as the usdm p13's (h22 ecu). I have a good connect for ecu's, pm me or email me at maximumpsi2@aol.com, ill see what i can do for you...you should definetly use 93 octane (where the hell do they even sell 91?? LOL , always use 93 or even sunoco ultra 94 , its worth it w/ the higher compression. Also, you do NOT WANT TO GO OBD2, **NAUGHTY NAUGHTY** OBD1 is much much more tuner friendly, where obd2's throw check engine's with any and ALL internal mods, forced induction, and more. If you need the obd2-1 conversion harness to fit a obd1 ecu i also can get that from the same guy that has the ecu's. Oh, and ur question about it saying p72-2 and p72-1, that has to do w/ which obd it is...remember, even obd2's are not all the same, there is what us tuners call obd2-a and obd2-b, or some even call obd2-b OBD3....obd2-a is 96-99 tegs, 96-98 civics, obd2-b is 00-01 tegs, 99-00 eks...anything else? Hit me up on aol...hope i helped

PEACE

 

when i researched which ecu to use with mine, it was well said that the usdm ecu makes more power on the <U>jdm engine </U>that the jdm ecu. It's still said.

the one dyno comparison that i saw showed the the peak was the same, but the midrange was much better with the usdm ecu. I'm not sure what fuel octane was being used.

The 0.6 cr bump should pretty well be enough to gain the 8hp alone. But one other difference, that likely contributes to the 8 hp power rating diff btw the two engines is the header. jdm has a 2 1/4" collector (but some ungodly restrictive welds inside, but thats another story).

d

 

I have a JDM B18C. The JDM ECU is garbage.


JDM p72&lt;USDM p72&lt;chipped p28/p30/p72 with a custom RoaringTurtle chip

and yes the pistons are different.

 

how is the jdm ecu "garbage?"

 

maps suck and so does the speed governor... its been proven many times that the USDM p72 ECU is better than the JDM counterpart.

 

hm.. guess i should look into that. whats the governor set at on the jdm ecu anyway (in mph)?

 

105mph iirc.

 

weird, my ecu hasn't been modded, but i've been up to 130mph before.. maybe because of the s-afc install


Modified by AlxSiR7 at 7:52 PM 11/30/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SilverejSi-R_g &raquo;</TD></TR><TR><TD CLASS="quote">......then the jdm p-72 has diffrent mapping than a usdm p72?
How can you get it to run right on us 91 octane ? Im converting to an obd 2 set up on my sir-g hoping that it might help everything??? what can i do on a obd2 set-up to further aid the 10.6:1 cuz it cant be running that compression on 91 octane and a us p72????????????


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

Your ECU doesnt know the octane level of the gas... and 10.6:1 you will be more than fine on pump gas...
-Mike

 

i have a jdm b18c with a jdm p-72 ecu. the engine runs perfect with 91 octane. I need to get my hands on octane 93 to see how this sucka works.

 

feels the same to me.. i always use 93 or sunoco 94 in my b18c

 

i agree i now have a usdmobd3 set up and my car runs great, i took the ecu out of my one owner pristine white 99gsr and put it in my civic and it works perfect. I agree i like the usdm obd2ecu more (not necessarily for mod friendly attiude) but rater reliability and it feels damm cold and dry around here these days