imported_magicguy

I went on dyno about a week ago with my B18C5
got an unexpected sh!tty number putting down on the wheel, did a leak down test, compression test, everything cleaned..end up it was the second O2 sensor which shows fail....i got it replaced and went on dyno 5 days ago...and GUESS how much WPH i gained back~ lol~~

i'll post my answer tomorrow,

so those people who has a failed O2 sensor..please replace it asap if u want ur engine to run back to normal~~

chris_si98

ya...

we all know o2's cause bad performance...

imported_mikepasini

whats was your compression numbers???

int3gl2a

when you say o2, do you mean the sensor? does that mean a person running a punched cat with a o2 CEL is losing hp?

imported_eth0r

my o2 sensors are cooked, good thing i have some new ones ready to go in

1sykcoupe

this threads useless.

imported_supragino

i doubt an O2 sensor will do anything

unless its previously cooked and u need a new one

szuberi

^^ thats what i was thinking. if your o2 sensor is down below in your exhaust system...i wonder how it would rob any hp since the stroke cycle is already over.

VTEC_Thunder

^^If it's getting a false reading, it'll make your engine run too rich or too lean thus not running at the proper mixture and robbing you of power.....

cibs

why would you even start this thread without putting up a number?




worst thread ever...

VTEC_Thunder

^^so true....

chris_si98

clearly you dont understand how an engine operates.

zeeman

iTrader: (1)

Well with honda ecus, anything over 80% throttle the ecu automatically switches into open loop. So i can't see having a bad o2 sensor causing a dyno pull to result in less power b/c at WOT (like you do on a dyno) the ecu is in open loop (not using the o2 feedback to adjust fuel), so if you're o2 is pooched, it shouldn't effect the power output on a dyno.

But if you say it did, post up the before/after charts. Its been a few days now.

imported_mikepasini

talking $hit... thats all...

VTEC_Thunder

^^I stand corrected....lol....thats true...most ecu's go open loop at 80% to WOT.....It doesn't even look at the O2's, so how could it effect power at WOT.....




The only way I can think of it effecting power at WOT is if the CEL light got kicked on by the bad O2 and the ecu is in "limp mode"....

zeeman

iTrader: (1)

well if the ecu is in limp mode it wouldn't rev past 4000rpm.

Bryce

his pos made 99whp end of thread.

chris_si98

is your pos frankie fixed yet or wut andy

imported_Christof

Zeeman has spoken lol

Bryce

Yea it was an o-ring on behind the block