My friend decided to dive in head first after his gsr swap 1994 civic coupe ex and is asking for my help.
He has a stock b18c1 and a chipped p28 ecu he wants to really learn the concept of how all of this is done and I do not really know anything about this type of thing.
He has been told my multiple people that what he needs to do is use crome(since it is free and he does not need anything fancy) and use the p72 rom and burn it to the chip since his motor is completely stock there should be no issues. That taking it to a shop would really be a waste of time since he already has everything needed to burn the maps, it would basically be a p72 ecu after its done.
I just want to double check the information he has been told so he doesn't end up with a disaster on his hands.

I appreciate any help and suggestions. I tried reading some of the faq section but I am not as smart with these kind of things as my friend

 

If his P28 ECU is correctly socketed/chipped, then basically creating a chip with a P72 map would get his engine up and running. He will need to disable the checksum routine and disable knock sensor within the Crome software before programming the map onto his chip. This should get him up and running, but shouldn't be used as an end solution. He may find an odd idle, stumbling at certain rpm/engine load, etc. which will indicate the need to have the car dyno tuned. Ideally, he should also raise VTEC engagement to 5000-5200 rpm on the stock GSR engine when using a P28 ECU as the IAB's are no longer operational.

 

Your friend has a chipped p28 which does not have intake air butterfly support.
A stock p72 rom is for a gsr with a stock intake manifold, exhaust manifold & cat.
Your friend is best off running a good basemap chip in his vehicle mapped for his application.

There isn't much of a need to dyno tune a stock gsr or even a gsr with intake/header/exhaust or an intake manifold.

You may order a 28 pin eprom chip basemap from our website
Phearable.net Custom OBD1 28 Pin Eprom Chip Basemap
& drop it into the ecu your self.

There is an instructional video on our website on how to change your eprom chip in an already socketed ecu.
Phearable.net - Tech Area
Have him read Information :: EFI Beginner Guide

 

GSRs run like trash with the butterflies not working correctly .... Adding more mods no matter how simple makes it drive even worse ... A real part throttle tune will make a huge difference .... Get a wideband and learn how to datalog

 

Thank you very much for the help. I figured he would not need any special type of tune since everything is basically stock. He said he might know someone with a socketed p72. He already has a burner etc he got in a trade from someone who could not use it anymore.

 

Some Gsr butterflies are vacuum regulated as well just to let you know

 

When vacuum is applied to the butterflies/secondaries, they are closed (intake air takes longer route through manifold). When vacuum is not applied, they are open. This is the reason you can get away with a P28, etc on a GSR. The secondaries simply remain open all the time as the P28 ECU will not close the secondaries.

The GSR ECU tells the IAB control solenoid to keep vacuum to the secondary diaphragm (keeping butterflies closed), until a set RPM at which time it closes off the vacuum to the diaphragm letting the secondaries open up and the incoming air take the shorter intake path which is better for high rpm power.