I swapped a b20b low compression into my gsr that already had a b18b in it.
I swap the Intake manifold over because the b20 had that crazy high one on it. It has a gsr header and the rest is type R.
Iv read that the b18b ran alittle rich and runs the b20 mostly fine.
But my b20 seems to be running lean before 4000 RPM and rich after 4500 RPM. Car just bogs and kinda hesitates till it gets up in rpms and then takes off!
I have a new fuel pump, new injectors, fuel filter, distributor, coils and plugs all installed. Also checked to see if my timing was off.

Also something more interesting is, when the car is cold it runs mint!

So in my mine all I have left is the ecu, its just a obd2 p75. Looking closely at the stock B20 and B18B torque curves, then imaging that fuel and ignition requirements follow those curves, it makes sense that my ecu wont keep up.

I was thinking on just buying a chipped ecu with a b20 map on it from phearable ecu's they seem to be legit.

Just looking for any insight or comments

thanks.

 

I have a low compression b20b in my integra running on a p75 no problems what so ever. Check your intake manifold and make sure your didn't switch any plugs. Also make sure you bleed the coolant good. Just my 2 cents.

 

Ill check in a few, but I did with a guy thats done atleast 10 b swaps. Im guessing only a few have the same ends on them.
Curious way it runs good when its cold, thats gotta be linked to somthing?

 

Thats why I said bleed the coolant because when its cold the temp has not risen to the point of having to cycle through the engine.

 

nvm buddy fixed it, was the crank sensor. Somehow not sure if it was bad or he mumbled some **** about being the wrong place lol. Also found out the hard way that you cant read codes without a bulb in the cluster.
Still not fully happy with the ecu running this motor but seems mostly fine.
Ill still likely get a chipped one and some point.
Thanks mate.