hey guys i gota 89 si that is converted to obd1 , im running a boosted b20 in it right now but im about to pull that to go all motor, What ecu am I gunna need? Also am I going to be okay keeping the Walbro 255 fuel pump in the car? Thanks

 

You said b20vtec then you said a boosted b20...what head are you using?

I'de go with a p72 with a custom boost base map. You cant run a stock basemap with boost. you should go with Hondata, if you cant afford it, go to a reputable tuning shop.

You're going to need to do this, no stock ECU will be able to regulate your high flow fuel pump, plus all that air being introduced, your fuel:air will be shot to hell.

 

he said he's boosted now, but he is about to be going all motor. also I'm not sure I understand your comment that no stock ecu will be able to regulate a high flow fuel pump. a fuel pump is not "regulated" by the ecu. it is powered by a signal sent by the ecu. all the ecu does is send a signal to the pump saying "pump fuel", not "pump x amount of fuel". adding a high capacity fuel pump does nothing without changing the fuel pressure regulator or injectors. it just allows for extra capacity when it is called for by bumping up fuel pressure and/or by adding bigger injectors.

all that being said, yes keeping the walbro fuel pump will be fine.

sorry for the rant, now on to the OP's first question. an obd1 vtec ecu (p72 or p28) will be the best to tune your setup on. no stock ecu is designed to run a b20/vtec considering it was never a motor built by Honda. so going with Hondata, Neptune, ect., will be adequate so that you can do a street tune or have a shop dyno tune it.

 

Still, best bet would be to swap out the injectors and FPR just to be safe. I dont know if anyone is ignorant enough to have a boosted set up with stock injectors and FPR, but at the same time be running a high flow pump.

Basically im saying you might as well stick with all stock parts if you're going NA, no need for high flow or high impedence or any of that BS.

Why the p28? Thats a single cam vtec ecu, it would make more sense to at least tune against a dohc base map rather than an sohc basemap.

 

p28's are easyer to come by. for me atleast.

 

Fair enough.

 

i said get a p28 or a p72 and then get hondata or neptune or any of the other programs to tune on. i wouldn't do a p28 in stock form or a p72 in stock form for that matter with a b20 vtec. Like I said before, no stock ecu is designed to run a b20 vtec since it was obviously not a motor made by Honda. you can tune a p28 exactly the same as a p72 if you are running hondata, neptune, chrome, ect...

 

like previously suggested, tune no matter what you choose. You'll thank us later

 

Thanks man , thats all I needed to know.