Noisey Lifters.

[Daboss]

Just as the topic states, can noisey lifters enable r&r on a stock rb25det computer? I just notice that in my car sometimes it feels sluggish to drive after I have reset the computer and drove for about a week. On initial reset the cars goes like the wind and pulls excellently, but after about a week or so it just seems to lose that initial bite like the tune on it has been richened up. My lifters are noisey and I also have forged pistons, I just wanted to know if that could contribute to knock and cause the stock comp to go into the r&r maps.

Edited April 5, 2009 by Daboss

[R31Nismoid]

R&R is airflow

Not mechanical

[Daboss]

R&R is airflow

Not mechanical

My bad I meant the retarding of the map due to knock. Not r&r, thanks for the correction , just getting up and haven't had my coffee as yet .

[Guilt-Toy]

YES. Having forged pistons and noisy engine will cause the ECU to revert back to the low octane low timing map and you will lose power because it thinks the engine is pinging.

There is away to disconnect your knock sensors and run a resistor on the line to trick the ecu into thinking there is no knock if you want to do it that way.

Search the forum, a mate of mine has got 280 - 300rwkw out of his stock ecu by tricking R&R and by disabling the stock knock sensors. his username is *RB2530* or something like that.

Do a search. let me know if you cannot find it.

[pipster11]

could be chocked up o2 sensor not seeing any airflow cos its coated in soot or just has never been changed

my 2 cents

[Guilt-Toy]

could be chocked up o2 sensor not seeing any airflow cos its coated in soot or just has never been changed

my 2 cents

then why does it come good after a ecu reset?

I did not know stock ecu's clean the afm's when they have been reset.

[Daboss]

YES. Having forged pistons and noisy engine will cause the ECU to revert back to the low octane low timing map and you will lose power because it thinks the engine is pinging.

There is away to disconnect your knock sensors and run a resistor on the line to trick the ecu into thinking there is no knock if you want to do it that way.

Search the forum, a mate of mine has got 280 - 300rwkw out of his stock ecu by tricking R&R and by disabling the stock knock sensors. his username is *RB2530* or something like that.

Do a search. let me know if you cannot find it.

I had a feeling that was the case, cause when I reset the ecu the car feels and runs like a dream, but as time goes it feels less and less powerful and my engine is kinda noisy with forgies. I found the thread, Thanks. Will look into this as soon as I have a way to monitor knock myself all the time.

[Guilt-Toy]

just reset the ecu once a week. not hard.

[Daboss]

could be chocked up o2 sensor not seeing any airflow cos its coated in soot or just has never been changed

my 2 cents

Hmmm I doubt it cause I changed the O2 sensor myself less than 10000km ago.

[pipster11]

then why does it come good after a ecu reset?

I did not know stock ecu's clean the afm's when they have been reset.

comp goes to factory defaults then uses the o2 info to tune fuel trims

o2 sensors are prob fine and just plugged up from soot

just pull it out and have a look

if its nice and clean its not the problem

if its full of crap then its overfueling clean it out with carby cleaner and replace and see what happens