i just swapped in a jdm h22 in my 92 prelude si and i am using a p28 ecu and it runs like crap when i hit vtec. instead of giving me power it bogs down and it kind of sounds like its either spitting to much fuel or not enough but you can definitly tell when vtec kicks in. and thier is also no check engine light need help

 

should i use a p13 or i also heard that a p72 will work good also

 

I use a stock p28 without any problems. But then again my setup may be different from yours.

Why not get the p28 chipped, it should still run great and will be cheaper than any of the two options you listed earlier..

 

get a usdm p13. and you will love yourself for it.

when doing a swap. get the right ecu that is designed for your motor. sure a p28 will work. but it doesn't control the aib's. thus limiting power. and also smacks rev limiter at 7300ish. plus it was made for a civic with smaller injectors. the pulse and percentage may be slightly off.

 

are you using a STOCK p28? if you do i believe your not getting enough fuel and your butterflies arent opening stated in the above post.

get the right ecu, p13 or get your p28 chipped by a REAL shop. none of that ebay stuff.

 

butterflies are not opening...p28 doesnt have butterfly controls...take out your butterflies or wire an msd switch to open your butterflies

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">get a usdm p13. and you will love yourself for it.

when doing a swap. get the right ecu that is designed for your motor. sure a p28 will work. but it doesn't control the aib's. thus limiting power. and also smacks rev limiter at 7300ish. plus it was made for a civic with smaller injectors. the pulse and percentage may be slightly off.</TD></TR></TABLE>

u can get a p28 to do w/e u want it to. thus adding the iab's and remapping it to fit an h22 specs. redlines can be set at w/e u want. also a usdm p13 dont have the hondata options, whats an ecu w/o hondata?

 

you can't get a p28 to do **** without the hondata unit. thats the thing. i've been referring to the p28 that he is using as a "stock p28". personally i think the p72 is the better hondata unit. however they are allmost identical in most aspects.

 

i have a p28 chipped to h22 specs...it runs it just like a chipped p13 would...the only thing it doesnt have is the butterfly controls....but i took out my butterflies so it doesnt really matter

 

so hows a p72 do without hondata

 

without hondata. do not use anytyhing but a p13. there is a dyno chart of the p72 vs the p13 in stock form. i think joel(satan srv) posted it not too long ago. both the p72 and p28 will fall on it's *** because of the butterfly valves.

 

What is the name of the program, and what are the specs??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">without hondata. do not use anytyhing but a p13. there is a dyno chart of the p72 vs the p13 in stock form. i think joel(satan srv) posted it not too long ago. both the p72 and p28 will fall on it's *** because of the butterfly valves.</TD></TR></TABLE>

wat do u mean they both fall on their face cus of the butterfly valves?? the p72 comes w/ iab's so it woudlnt matter. the reason it lagged is due to the fact that vtec kicks in earlier on gsr's then they do on h22's. but overall the p72s make more peak power.

btw, there was a guy awhile back selling ecus for 100bucks. i think he had p72's mapped for an h22 and it cost like 25bucks more. not bad considering p13's go for like 200 or more..

 

h22: vtec 5000, iab's ~4600
b18(c1(:vtec 4500, iab's~6000

it falls on it's *** because it's only using 4 of the runners up to 6000. so it's choking in vtec.

 

i see, i thought it was cus the cams on the h22 are bigger and have longer durations then the gsr cams. and if u use the p72 it treats the h22 like its a gsr cam. mabye its like a h22 cam in a gsr? (hypothetically speaking) correct me if im wrong, i dont care.

 

the reason it falls on it's *** is because it makes it's power lower. thus the reason the iab's are there sooner. it needs that air at a lower rpm to make that mid ranger power. whereas the gsr doesn't. it's like puting a hifh flow cat on a stock exhaust. it's just restricting it.

 

You can make a p28 open butterflies without Hondata. Any chipped p28 can do it you just need to add some extra stuff at the ecu. If anyone wants a p28 setup to run a prelude and operate the butterflies message Kenji.

 

P28 = 1.6 litre motor 240cc injectors

H22a = 2.2 litre motor 290cc injectors

37.5% bigger displacement, only 21% bigger injectors

Simple math says you are about 16% short on fuel

ouch. I feel sorry for your combustion chamber.

 

Jason, I am running a JUN H22 Program on my p28...

Vtec kicks in at 4400rpm
Redline is at 8500rpm...

It pulls really hard.... Vtec kicks in too early for me though...gotta get a vtec controller.... I have a skunk 2 chip that i think would be a lot better though... Vtec kicks in at 4800rpm, redline is at 8500rpm... I would swap that chip on there but I dont know how to solder... The ecu was chipped by PYR racing

 

Hmm sounds interesting.. And isnt the chip socketed, you should be able to just pull out one and put in the other.. ??

 

dont know...never opened an ecu b4...might be

 

hey joel. nice calculations and all. but you are leaving out injector cycle and duty. so it could either be closer or worse.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMlude92 &raquo;</TD></TR><TR><TD CLASS="quote">hey joel. nice calculations and all. but you are leaving out injector cycle and duty. so it could either be closer or worse.</TD></TR></TABLE>

like i said, simple math.

I don't get what you are saying. The ecu sends the same pulse width regardless. What does duty cycle have to do with it.

 

Again I run a stock p28 with no problems...

 

the injectors. they pulse a certain length every time...............also they only "Inject" a certain percentage of fuel. when you are stock. you are not maxing out your injectors. on the stock ecu they run at a certain percentage of their overall cc. ie 73% injector duty. the injectors are only pulsing 73% of their maximum potential. so 290x.73=211.7 i'm not saying 73% is our injector duty. but i'm saying that they don't max out the injectors in stock form. so theoretically. there could be more of a difference in fuel maps between those ecu's than what meets the eye. because not all honda's have the same injector duty%

do you get what i'm saying now?