Hesitates after 7lbs...

[tpunx99GSX]

I have a friend with a 2g GST.
Mods:
S16g turbo
SAFC
AVCR
550cc injectors
FMIC
Intake
Exhaust

For some reason or another after he spools and around 3500 rpms the car will hesitate and not accelerate any more, then we change gears and it does the same thing.
Its almost as if its hitting a wall at 3500 rpms.
I did a boost leak check and fixed a small leak on the TB, now there are no leaks.
Checked timing and it was perfect at 5 BTDC.
Safc i have set at -8 across the board.
I disconnected the AVCR to make sure that wasnt having any issues, still does it.
Checked the plugs, The tips were white, and the gap backed out to .035 but i wouldnt think that would be a major issue.
Any ideas?

[JET]

It is the plugs probably. If you checked the gap, why didn't you close them down? Get them gapped down to .028".

[Shane@DBPerformance]

Spark plugs and too rich? Come on. The first thing you should have tried was a new set of spark plugs with them gapped to .028" at the biggest.

[brando]

its a miss for sure. hes hitting fuel cut. DON'T RUN IT ANYMORE. you may need to advance the timing a bit. the car is leaning out not running too rich. if it were running rich they would be black and he would be puffin black smoke

[JET]

its a miss for sure. hes hitting fuel cut. DON'T RUN IT ANYMORE. you may need to advance the timing a bit. the car is leaning out not running too rich. if it were running rich they would be black and he would be puffin black smoke

Ignore this guy. He isn't hitting fuel cut at 7 psi. You also have no idea if he is running lean or rich. His SAFC settings would indicate he is pretty rich.

[crazy_skier]

i had this happen.... new spark plug wires will take care of it. Try it :D

[FFPerformance]

Ignore this guy. He isn't hitting fuel cut at 7 psi. You also have no idea if he is running lean or rich. His SAFC settings would indicate he is pretty rich.

I'd have to disagree with you... spark plug basics 101, reading spark plugs.....

If you pull them and they are wet and black, then you are most likely too rich (possible oil consumption as well)
If you pull them and they are dry and white, then you are most likely too lean (as the original poster stated)
If you pull them and they are a 'toast' or tan color, then you are in the right area for an appropriate afr.

I would double check the wideband sensorys you're usuing to tune the SAFC and make sure that they are in working order. Perhaps cross check the wideband with one from a dyno? I can see how the safc could have been adjusting fuel based on what it thought was a rich reading, and causing a lean condition if the sensors are going out.... sometimes leaded fuel accelerates them wearing out too...

good luck!

$.02

[FFPerformance]

Oh and double check your injectors as well

[xveganxcowboyx]

An SAFC does not adjust fuel on it's own. It's a user input device.

[Super Bleeder!!]

Since when did afcs have sensors?