xeno

i should get the ecu tuned for the larger displacement motor right? does anyone know anywhere good to go/ what program i should run chrome,neptune, hondata ect. ...?

dave22

Nope.

I'm using my PR4 with zero issues.

Fabrik8

If you're just going for a slightly larger engine, with no other mods, the stock ECU is fine. There is enough flow capacity in the stock injectors, etc., and the ECU will compensate for the larger engine based on the MAP and O2 sensor readings. An LS block is so close in spec to a B20 block that there really isn't any reason to use any other ECU.

Ick

I was using a p75 for my b20z, but running lean at some points. Got it tuned, with the base car putting 161/134 (the dyno reads high, before anyone cries).
My suggestion would be to get it tuned (send it off to phearable, etc), but like others said, it's possible to run on a stock LS map. I ran on the stock p75 for 7 months with no issues.

1slowb18

use the ecu and stock injectors, i had nothing but problems with my tune( which was done by 3 different people at the same shop) so i put the stock injectors and stock ecu back in and the shit ran like a champ

Fabrik8

Your tune must have not been very good. You probably didn't need anything bigger than the stock injectors too, so that was probably most of it. Injectors that are unnecessarily big can make for some nice part throttle problems.
There shouldn't be anything wrong with keeping the stock injectors and picking up a few HP with a decent tune.

1slowb18

i had 440's and a 255 fuel pump, but i had b20 vtec, and after market fuel pressure regulator, resistor box, and b16 throttle body, just a bunch of mix matched shit, and the tune was shit, but after i put all the stock shit back on it ran like a champ

dave22

Why are people answering questions he didn't ask?

P75? B20/VTEC?

Ick

I thought he could connect the dots. Isn't pr4 an LS ecu? Well that's what a p75 is. And I ran my b20 on that.

dave22

They're both LS ECUs but they aren't the same.