stumbling along

[5150DSM]

Well I finally got all the regular maitenence done and the car is on the road. Now I am having some small tuning issues, pocketlogger is on the way but until then I need to get the car at least "normal" My main problem is stumbling and hesitation above 3500-4000rpm I am fairly sure that the 255lph pump is the major contributor making me run too rich and I do have a S-AFC II to correct this but... I know tuning without datalogging can be pretty hard on the car and runs the potential for disaster. Would it be "safe" to slightly adjust my SAFC (2-4%) to try and lessen the rich condition or would such small percentages not have a noticeable effect. Any experienced input is appreciated. Thanks.

 

[5150DSM]

I previously removed my snorkel and lower honeycomb and installed a K&N trying to compensate for the added fuel from the 255 but that has has little effect. Plus my BOV whistles as the turbo spools which could also be indicative of a boost leak. I'm just walking through the steps trying to figure it out. Thanks for any info.
Peace

 

[5150DSM]

Well I decided to gamble a bit and try to tune my car slightly. A cursory test indicated only slight boost leaks due to hose wear. (these are being replaced) So, I decided to use my SAFC-II to try to lean out the engine at higher throttle positions. I am really wary of performing changes without the ability to log data so these nubers represent very slight adjustments... Lucky for me, my car responded well to the changes and stumbles approximately 70-80% less than it was. It is by now means tuned but at least I can step on or let off the gas without bogging now. Settings as follows:
throttle low/hi 30-70%
rpm points: 800-1200-1800-2400-3000-3600-4200-4800-5400-6000-6600-7200

Low Throttle: -2% from 800-4200 -3% from 4800-7200
Hi Throttle: -2% from 800-4200 -3% from 4800-7200

Like I said, not really tuned but a workable initial setting until I have logging capability. Hope this helps anyone in the same boat. Thanks for any input and/or opinions.

 

[kpt4321]

Definately sounds like boost leaks, but probably not just from old hoses. You ought to pressurize the intake, it could be leaking from all kinds of places.