Ok when I first bought my car 98 ek it had a obd1 d16z6 with a virgin P28 ecu and jumper harness. I blew this engine and had a shop in Dallas swap in a obd2a gsr engine, with a p72 ecu. I was having problems that you can read about here: https://honda-tech.com/zerothread?id=2357677

So while sitting and trying to think about what could be causing this problem I remembered the p28 ecu sitting in my closet with the jumper harness. So just out of curiosity I unplugged the p72 and plugged in the p28 and my car started idled fine and cleared 2 cel (no up stream o2 sensor, and Idle control system malfunction)

My question: Is it ok to use the virgin obd1 p28 ecu rather than the factory p72? Can anyone tell me how different the fuel maps for the p28 from the p72, I know the d16z6 is a 1.6l and the b18c1 is a 1.8l so will the p28 run a more lean mixture than the p72?

In the post ^there I think the problem with the rev-limiter comming in at 5k rpms is caused by the ecu.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dynimitejack &raquo;</TD></TR><TR><TD CLASS="quote">Ok when I first bought my car 98 ek it had a obd1 d16z6 with a virgin P28 ecu and jumper harness. I blew this engine and had a shop in Dallas swap in a obd2a gsr engine, with a p72 ecu. I was having problems that you can read about here: https://honda-tech.com/zerothread?id=2357677

So while sitting and trying to think about what could be causing this problem I remembered the p28 ecu sitting in my closet with the jumper harness. So just out of curiosity I unplugged the p72 and plugged in the p28 and my car started idled fine and cleared 2 cel (no up stream o2 sensor, and Idle control system malfunction)

My question: Is it ok to use the virgin obd1 p28 ecu rather than the factory p72? Can anyone tell me how different the fuel maps for the p28 from the p72, I know the d16z6 is a 1.6l and the b18c1 is a 1.8l so will the p28 run a more lean mixture than the p72?

In the post ^there I think the problem with the rev-limiter comming in at 5k rpms is caused by the ecu.</TD></TR></TABLE>


No dude, do not run a p28 in place of a p72. Huge difference high cam, check it out
p28



p72

 

A stock P28 is gonna run too lean to run a GS-R properly, also the vtec engagement point and rev limiter wont be where they should be. But if you get it chipped with GS-R basemaps you will be fine.

 

yea, what he said.

&lt;---Sells Chips

 

Ya I figured it would run too lean. I got excited though when the cels were gone though.

If I get the p28 chipped with a gsr base map will the butterflies on the intake manifold still function? and will I have to replace the obd2a dizzy with an obd1?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dynimitejack &raquo;</TD></TR><TR><TD CLASS="quote">If I get the p28 chipped with a gsr base map will the butterflies on the intake manifold still function? and will I have to replace the obd2a dizzy with an obd1?</TD></TR></TABLE>

No and no, just make sure the secondary butterflies remain open at all times.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dynimitejack &raquo;</TD></TR><TR><TD CLASS="quote">Ya I figured it would run too lean. I got excited though when the cels were gone though.

If I get the p28 chipped with a gsr base map will the butterflies on the intake manifold still function? and will I have to replace the obd2a dizzy with an obd1?</TD></TR></TABLE>

installing IAB to the p28 is an option.

 

IAB?

 

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

IAB -&gt; Intake Air Bypass, otherwise known as secondary butterflies.

 

could a virgin p28 still run the vtec on a gsr? I have an ls vtec but it at the p28 vtec crossover (5500 rpms) it just cuts out like the rev limiter.