Originally posted by Chris Ng
Here's my stab at it..
You're making good boost (according to an aftermarket boost guage right?)
You've done the throttle body mod and so the secondary plates are not the problem..
You've got an upgraded fuel pump and running 720 injectors in the secondaries..
If you are making good boost, your wastegate shoudl not be the cause of your lack of power, as Gene mentioned. if the wastegate wasn't working as it should you would be seeing uncontrolable high boost, or really poor boost buildup..
The other thing that affects boost would be the twin scroll system.. But from you're description of the problems I would doubt it's the twin scroll either..
Have you checked your ignition timing and the boost sensor? I would assume those were a couple thing syou have checked long ago..
So what does that leave? in my opinion I would start checking you initial tuning of your car.. It could jsut end up that you are running overly rich with your set up .. doing so will definitly make power sluggish (blowing flames out your exhaust, backfireing etc do not necessarly need to happen if you are runnign too rich to be making proper power)
You mentioned you have a s-afc installed in your car right? What mods do you have (injs, fuel pump, etc) what are your correction settings on your s-afc for both high and low throttle settings, what is your low and high throttle point set at? what are the initial settings you have selected under the etc menu?
Alright, now we're getting somewhere. Mods are dp, mp, catback, walbro, tb mod, new vacuum hoses, bov, and SAFC. Still running stock injectors in primaries and secondaries. I have not tuned the SAFC yet and am currently running ruch, flames and all. Thing is before I upgraded the exhaust and fuel pump, car still had the same problem. So I don't think tuning is the main issue. As far as settings go, I selected 4 cyl, and for throttle sensor type, the arrow starts at the bottom left and points diagonally to the upper right. Closed throttle 0V-1V and open 3V-5V. Timing is on but I've never checked the boost sensor. How do I do so? New plugs and wires as well. Also, in a previous post, you mentioned how you tied your SAFC into your boost sensor so it was boost as well as rpm dependant. How did you do that as well? Seems like a safer setup. Thanks for the thorough response Chris. Have you ever heard of these cars being equipped with lame ecu's? Think that's a possibility?