Phyxius Posted August 22, 2005 Share Posted August 22, 2005 I've been trying to tune with my new injectors, but it's turning out to be quite a pain. I get a bad stumble around 3500-4000 rpms at about 140-160kpa. If I stay in the throttle, it will start to backfire. I've tried leaning and richening to see what happens. Leaning seems to help more than richening, but I'm afraid to go too lean under boost. I don't really trust my current O2 sensor, though It stays around .7v in boost. You guys think I'm that rich, or should I suspect something else? Quote Link to comment Share on other sites More sharing options...
Guest SBD Posted August 22, 2005 Share Posted August 22, 2005 I've been trying to tune with my new injectors' date=' but it's turning out to be quite a pain. I get a bad stumble around 3500-4000 rpms at about 140-160kpa. If I stay in the throttle, it will start to backfire. I've tried leaning and richening to see what happens. Leaning seems to help more than richening, but I'm afraid to go too lean under boost. I don't really trust my current O2 sensor, though It stays around .7v in boost. You guys think I'm that rich, or should I suspect something else?[/quote'] Do a log and make sure that the stumble is NOT happening during Accel Enrichment. Accel Enrichment is fun. You can not properly tune new injectors without a wideband. You could get it half-*** running right without it, so I would try to get it close and then use a wideband. Did you have the car tuned properly with smaller injectors? If you did, post up your old and new setup (injectors, pressures, etc) and a screen shot of your old VE map. Quote Link to comment Share on other sites More sharing options...
Phyxius Posted August 22, 2005 Author Share Posted August 22, 2005 I meant to add that I don't think my MAT sensor is working right. I have the open element sensor, but it never rises more than a few degrees when on boost, and it's slow to do that. As far as accel enrichment goes, I have it turned off in boost. It was tuned fine before the new injectors. I was hoping to only have to change the required pw, but that doesnt seem to be the case. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted August 22, 2005 Share Posted August 22, 2005 but it never rises more than a few degrees when on boost, and it's slow to do that. Mine didn't rise much either once a quality intercooler was installed. Remove your IC and watch what it does, heh heh Quote Link to comment Share on other sites More sharing options...
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