R33 Issues Can You Help

[abr33]

Hi all, im new and have a problem that no search on here or google can solve.

Ok, so iv got an r33 gtst auto rb25det.

Iv fully rebuilt the engine, 1mm oversize, cp forged pistons, eagle H rods, full port n polish, custom extractors, top mount t04z, 50mm greddy wastegate, 3" straight through system, fmic, plus heaps i have forgotten.

Problem is i cant get it to run right, to have it idle and drive nicely, timing is set at about 25 degrees (shit loads) but doesnt detonate at all, and less advance it dies off. When i hold it wide it gets to 5000 revs and has a bad flat spot untill a spike in power at 6200. I have the stock ecu, all electrics are stock so i can get engineered. even if i hit the throttle at idle and it revs to 3000 it sometimes dies or struggles to get a smooth idle back. And its especially bad when driving even very lightly on throttle, i have to hold it on a bit when i back off to stop it stalling.

Any ideas would be great as its driving me nuts iv tried heaps like new afm, o2, reset ecu and all plugs, its got no leaks (air).

Everything electric is same as it was before i pulled it down and it used to run spot on. Its not running rich either (about 11-12L/100k)

Cheers!

Edited January 14, 2011 by Amon Burkill

[TTSNRSMAN]

mate i'm no tuner but if my car had had that amount of work done i'd go aftermarket computer like link/haltech/viper.even if you just change your exhaust you need it tuned properly.has it been dyno'ed to check things out?you want it to run good to prevent any damage to what you've got.good luck.

[ARTZ]

maybe add some more timing ..

[abr33]

all sorted guys running haltech, i was just asking if there was a problem i could fix i knew ecu had to be done but didnt think it was the problem :-)

[ClutchBurndout-:(]

lol stock ecu