p13 vs p28

[eulogy_1981]

which one of the cpu is better to run on an h22 i know you can run both but i heard rumors that it is better to run p28

[mcdizzle]

the p28 has to chipped and tuned in order to run the h22 to its potential. the p13 is obviously just the stock ecu and usually runs the h22 fairly rich.

[PR CB7]

p13 will make u run
p28 will make u run like shit


the reason people say the p28 its better for ur car cuz they forget to include the fact thats has to be chipped, if not ur ust running a civic ex basemap with vtec

po6, p28, p72, p75 basically when chipped will do equal functions, the only difference is p28 and p72 will have vtec already

p06 civic dx,lx,vx
p28 civic ex
p72 teggy gsr
p75 teggy ls
p13 h22 prelude

if u do not have a tuner or somebody that can chip ur ecu i would suggest running a p13, the only bad side is p13= stock prelude ecu, that means: EGR, KNOCK SENSOR, ETC

with a chipped ecu u can basicaly eliminate almost all

[semitas]

ya man, im going through that same ordeal as we speak, i mean write,

im trying to sell my JDM p13, even though i heard the JDM p13 does not look for a knock sensor, i dont have the egr connected,
i can run the p13 when the motor is warmed up with no problem, but once i park and the motor cools down, when i go back to start the car, the idle is super rough, and it can stay like that for up to like 10 minutes then it goes back to normal, but i dont like how the motor shakes

right now im driving with the accord ecu, no vtech but its a bit fast

the point is if you are getting a complete swap with everything hooked up, p13 is good, but is you are not going to have everything get a p28 and chip it and tune it

[Flatline]

ya man, im going through that same ordeal as we speak, i mean write,

im trying to sell my JDM p13, even though i heard the JDM p13 does not look for a knock sensor, i dont have the egr connected,
i can run the p13 when the motor is warmed up with no problem, but once i park and the motor cools down, when i go back to start the car, the idle is super rough, and it can stay like that for up to like 10 minutes then it goes back to normal, but i dont like how the motor shakes

right now im driving with the accord ecu, no vtech but its a bit fast

the point is if you are getting a complete swap with everything hooked up, p13 is good, but is you are not going to have everything get a p28 and chip it and tune it

well your gonna run rough on an accord ECU.... im surprised it even runs it to be honest.

[blackice]

yeah....the accord ecu is gonna run the h22 kinda messed up. the injectors and everything are different. the jdm p13 will look for the knock sensor and egr. swapping the p13 out for a chipped p28 was well worth the cost.

[evil_demon_01]

As above for the accord ecu (providing its a CB ecu), just remember that although the Vtec may not engage, the fuel and esp ignition maps are not correct for the H22, and you are running a risk.

I never really heard what the most obvious differences between the P28 and P13 are.
I personally am running the P28.
D112crzy can you chime in on this?

Btw for those interested:
P13 - 93-95 OBD-1 Prelude Vtec
P28 - 92-95 OBD-1 Civic Si/Ex

[blackice]

the most obvious differences between the p28 and p13 are...
1. p28 has no knock sensor support
2. p28 has no egr support
3. p28 has no support for the iab's (but can be added, it makes it a ton easier if the p28 is an auto also)

otherwise the only other difference is the chip/maps

[evil_demon_01]

the most obvious differences between the p28 and p13 are...
1. p28 has no knock sensor support
2. p28 has no egr support
3. p28 has no support for the iab's (but can be added, it makes it a ton easier if the p28 is an auto also)

otherwise the only other difference is the chip/maps

From factory yes, but the P28 can have the components added for knock sensor, and egr support. Not sure about IAB support.
So essentially they are the same ecu plus/minus a few components? Plus tune obviously

[blackice]

From factory yes, but the P28 can have the components added for knock sensor, and egr support. Not sure about IAB support.
So essentially they are the same ecu plus/minus a few components? Plus tune obviously

the boards are totally different if you get a chance to look at them but can function pretty much the same way with some modification/chipping. the knock sensor is a pain in the ass to add, you would have to source the components from a p72, pretty sure the p13's wouldn't swap in...also i'm not sure about the sensitivity of the p72s knock sensor hardware vs the p13.

adding egr support is meh....worthless to add if you are doing this for performance reasons, run a blockoff plate.

iab's definitely can be added, i bought an auto p28 and used the auto tranny controller parts to run them. (if i remember correctly the auto tranny on civics/tegs is controlled totally different than the accord/preludes as far as ecu/tcu goes) otherwise you have to source the parts from another ecu or electronics dealer...

[evil_demon_01]

the boards are totally different if you get a chance to look at them, the knock sensor is a pain in the ass to add, you would have to source the components from a p72, pretty sure the p13's wouldn't swap in...also i'm not sure about the sensitivity of the p72s knock sensor hardware vs the p13.

adding egr support is meh....worthless to add if you are doing this for performance reasons, run a blockoff plate.

iab's definitely can be added, i bought an auto p28 and used the auto tranny controller parts to run them. (if i remember correctly the auto tranny on civics/tegs is controlled totally different than the accord/preludes as far as ecu/tcu goes) otherwise you have to source the parts from another ecu or electronics dealer...

Interesting to know thanks

Though one thing - Egr support is highly valuable for performance if you are planning on boosting - its a pwm signal, which allows control of a boost control solenoid.

[blackice]

interesting, that leaves me wondering how many people use it that way. i guess the civic and teg guys are stuck running aftermarket hardware for their boost controller signal...

[evil_demon_01]

interesting, that leaves me wondering how many people use it that way. i guess the civic and teg guys are stuck running aftermarket hardware for their boost controller signal...

I guess thats why its harder to find the solenoids by themselves w/o the usual included controlling hardware

[semitas]

yeah....the accord ecu is gonna run the h22 kinda messed up. the injectors and everything are different.

r u guys serious? oh crap, then something can go wrong with mi engine?

for real are you guys talking just from speculations are it has happened to you or anyone you know personally?

because i work at a auto parts store and i was concerned about the injectors and turns out its the same part for both for the h and the f
and isn't the h just like the f except for the extra cam and the design of the cams(for vtec,)

the mechanic that did my swap had the engine in a 97 lude wich he converted it to obd1, so the engine came with no harness, he used all my accord harness and a few other additional wires and the stock 93 ex ecu and i have not had a problem since

everything else is stock, tranny, injectors, fuel rail, its just the engine itself thats different

so if you KNOW of anyone that had a jdm h in a cb and using the stock cb7 ecu and had a problem because of the ecu let me know so i can put more emphasis on getting a p28 and chipping it, cause right now the car runs exelente, super super smooth, minus the vtec of course

and im talking from experience here, ever since i had the swap done back in may i have been driving the car DAILY and no problem

come to think of it its just like a heavier f series with an extra cam

[blackice]

which injectors are you running? f22 or h22...the h22 comes with 370 cc injectors while the f22 runs 240's. an engine running lean may seem to run great but cylinder temps can go through the roof. also remember the h22 has a higher compression ratio than the f22. i would highly recommend you get a p13 or chipped p28. (i have a jdm p13 for sale as a matter of fact lol)