lex 550s boggin out near 3000 rpms?

[night-rider]

got the lex and 550s and ive been playin with ignition timing a bit and fuel pressure but no matter what i do it seems to bog out around 3000 rpms sometimes a bit sooner its alright at idel when i rev it sumtimes makes a noise but not much its in all gears and my air fuel gauge flicks to lean when it happens

[abhattan]

did you do an upgraded fuel pump? How much boost are you running?

[night-rider]

yes i ave a walbro fuel pump and aeromotive adjustable fuel pressure regulator and before i installed these new parts i was running 11 pounds but now i havent been able to get past 8 it starts boggin out

[abhattan]

How are you controlling your boost? Boost controller or shimmed wastegate? If you slowly accelerate will it run smoothly past 3000 rpms?

[night-rider]

i hbave a greddy manual boost controller set at thbe minimum setting it seems like if i accelerate slowly i can go past 3000 ive only taken it to ahbout 3500 cause i didnt want to pushb it also i put in iridium spark plugs could thbat make a difference perhbaps whben i get boost it blows out thbe spark? i thbink factory is platinum tipped?

[supramacist]

Ya the stock plugs were NGK platinums.

I don't think the iridium tips are going to cause you to bog.
The solution to that is a blaster coil.

Have you checked your fuel pressure regulator?

[night-rider]

i hbave installed a aeromotive adjustable fel pressure regulator and i ave tried different pressures and it seems to only affect it slightly my supra manual says at idle with vacuum hose connected pressure sould be 23-30 pounds i hbave hbeard from some people hbat with thbe 550 injectors you should decrease fuel pressure?

[abhattan]

If your running around 11lbs, you should up the fuel pressure to about 34 psi. For every lb of boost, a lb of fuel pressure. 3000 is right where you should be at full boost and if you are leaning out because of fuel pressure, that would probably make it bog. But I couldn't see it doing it that much. Check it any way. Did you check all of your piping and vacuum lines?

[night-rider]

i ave chbecked all my vacuum lines and thbey are all good and my pressure regulaer hbas a vacuum line to it and it automatically increases fuel pressure pound for every pound of boost , anothber thbing ive noticed it will do it at an idle it is hbarder to nitice but i can feel it hbere and thbere and it flickers to lean whben it hbappens , occasionally it will drop thbe idle down to about 500 and it will constantly show lean then ill rev it up and it will be normal again

[abhattan]

It's kind of hard to say without me actually listening to it and experiencing it myself. If your timing is good, I would also check the cam positioning sensor or the crank sensor. Were the injectors used? If so, did you have them benched flowed?