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32 Gtr Running Like A Wheel Barrow

den001

By den001,
in Engines & Forced Induction

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den001 Proficient

den001

Posted
Posted

i have a 32 gtr,

now on wendsday i took it to eastern creek and posted a top time of 11.7 at 115mph, with only a exhaust and 13psi boost, stock turbos, stock ecu

i was wrapt....

before this i could always noitce somthing like a choking feeling while the engine was reving out, and you could notice the torque loss, not massivly, but abit......

this was more only during the day time, during night it would run mad.... i put that down to intake temps

now, since i ran that time, the next day i went and put some cam gears on and set them to 2 deg advance on intake and 5 deg retard exhaust, ran the car, perfect, absolute animal compared to the 11.7 pass.... i couldn't believe it, this test was also at night, drove home, woke up im morning, and took for another drive, same as before, feeling lazy and choked up during the day, night came, abit better....

now tonight, i have noticed a big amount of power loss, and a shit load more laziness, the exhaust note has changed, sounds choked up, the engine builds boost good as i watch the gauge but its like the motor doesn't like the positive pressure its being given.... and lost throttle response...

i always put good fuel in aswell

also under load like at 2500rpm in 5th, ill put the throttle flat, and it will build boost probably up until 3000rpm and then the bov's start making their noises with my foot still to the floor...

now i think that this may be something to do with the computer, but im still unsure but wtf is the story with the bov's going off while still under load????

any1 with similar issues?? or theory's

any and all help is appreciated

cheers

denis

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Rowdyr32 Mentor

Rowdyr32

Posted
Posted

Maybe you stock has picked up knock and is running the other map. Try disconnecting you battery for a while and put on the interior light for 2 minutes then reconnect everything. Possible??? Also try the diagnostic on the ecu?

The factory ecu can by what I've been told reterd timing if it sensors knock something a pfc cannot.

swanny180 Proficient

swanny180

Posted
Posted

Make sure your cat converter hasn't melted to pieces and become an exhaust restriction.

Only takes a minute or two to pull it out and have a look, and wont be difficult to replace if it is your problem.

den001 Proficient

den001

Posted
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Posted

ok, the cat is gutted aniways,

now i resset the timing back to standard and it seems to have more torque again, but that choking issue is still there, after about a 20 min drive when everyting warms up good, the choking issue rises again, could it be the o2 sensors???

i know that the cat o2 sensor is not there and the wire has been cut..... and they are definatly not touching....

yes 11.7 with only thoes mods...

pitty it wouldnt do a 18.7 now, jokes

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