I recently put a b18b1 engine in my 90 honda civic hatchback. Well, since later down the line ill be going lsvtec, ive got a p28 ecu that im using. It is boosted and i want to know if the p28 will be fine to run the ls. I was worried about the whole vtec/nonvtec difference of the computer/engine. I have driven the car and it seems fine, but it is throwing a cel for vtec. The p28 is chipped and will be tuned on CROME. What do i need to do to get it running right so i dont mess the motor up?

 

if you get it tuned to remove vtec i think it works but if not your car will run like ****......i had a p28 on my ls and it ran horrible so i sold the p28 for 100 and bought a p75 ( ls ecu) for 30 and pocketed the rest make a huge difference , save the p28 until you do your ls vtec conversion

 

It'll work just fine, just have a tuner disable the VTEC.

 

ok, and from that just tune the fuel and everything with what is best for the car?

(i dont know anything about this, )

 

Either do some homework time on pgmfi.org or pay a tuner for a full tune.

I'd personally leave vtec on... and just get extra map resolution for kicks. If the cells before/after vtec match smoothly, the "engagement" won't be noticeable.

 

oh, i wont be tuning it, haha the car would blow up if i did, but me and the guy that is tuning it wanted to make sure the p28 would run a ls ok

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaVTEC1993 &raquo;</TD></TR><TR><TD CLASS="quote">oh, i wont be tuning it, haha the car would blow up if i did, but me and the guy that is tuning it wanted to make sure the p28 would run a ls ok</TD></TR></TABLE>

A chipped and tuned p28 will run it just fine. You just have a dual map setup and the ability to trigger a solenoid.

So you can leave vtec on, and use the dual maps to get double the # of tuneable cells. Or u can turn it off and run off a single map.

You could also use the vtec activation to trigger something else, like water injection or n20 or flame thrower etc

 

new question, what if i get a p75 to run the ls right now, and since im going to be lsvtec later, chip that for vtec? Is that even possible?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaVTEC1993 &raquo;</TD></TR><TR><TD CLASS="quote">new question, what if i get a p75 to run the ls right now, and since im going to be lsvtec later, chip that for vtec? Is that even possible?</TD></TR></TABLE>

It can be chipped and converted to a vtec spec ecu.

 

is that something that can be done with CROME or the chip itself?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaVTEC1993 &raquo;</TD></TR><TR><TD CLASS="quote">is that something that can be done with CROME or the chip itself?</TD></TR></TABLE>

Ecu needs to be chipped for normal tuning usage. There is a 2nd set of chipping/modification that needs to be done to the ecu itself to use vtec on that ecu. It basically converts the board to the same specs as the p28 ecu.

Easiest to get both done at the same time by whoever you have chip the ecu.

Once chipped and converted the tuner can turn on/off vtec within the code itself.

 

are you a tuner or something? im asking because if the guy cant do it ill need to send it to someone who can chip it haha

 

pm'd you about this.

 

replied

 

I've decided to go with a P75 for now, then have it chipped for the head later. Anyone got one for sale?

 

I would honestly say just pick up a P28 or vtec spec ecu at first. Then you won't have to upgrade or do anything when you put the vtec head on. The obd1 P28 can basically run any combination of MPFIOBD0/OBD1/pre-coil pack obd2 motors. It just has to be programed accordingly.

 

the only thing i was thinking of anyway is the fact that the p28s go for like 80-100 and the p75s go for like 50, and even with chipping the p75 will be less than the stock p28 (am i right? lol) But the thing is i dont even know when ill be getting that head, it might take me til this time next year

 

Curious to know How would one activate the 2nd map to sell you said it best, falls thrower

 

Curious to know How would one activate the 2nd map to sell you said it best, falls thrower

 

Congratulations... you just bumped an 11 year old thread.
A P28 ECU won't run a B18B engine in its stock form. It will a B18B with a custom tuned map with the VTEC circuit turned off or disabled. A dual map chip and specialized socket can be purchased from Moates... not that there is any real good reason to "switch" between maps. Join the rest of us in 2018 and get the Hondata s300... then you can upload any map you choose at any time... and get a FAR better system than a basic CROME chip map.