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Old 02-06-2015, 11:12 AM   #1
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Vortech Installed. Bad tuner?

I guess I'm looking for input from other vortech guys on here. I installed a V1, non intercooled, 8lb pulley. 42# inj, 90mm MAF, etc, etc. I have all the supporting mods I need and dyno tuned by reputable shop. I've put about 500-1000 miles on it but have a few concerns:
1) It MUST warm up before driving. If i try to start it and drive, it will stutter, spit, and bog until my coolant temp reaches about 100. It idles great in the meantime.
2) After releasing the throttle A/F drops down to 10-11 for about 3-5 seconds which feels like it's flooded when I go to accelerate again. Meaning that the car feels a little bogged down afterwards for a few seconds till it clears out.
3) After a partial boost acceleration, I seem to have a small amount of detonation/backfiring on decel.

The car drives amazing at WOT and idles perfect. It seems to be that all the in-between stuff messes with fuel delivery sometimes, but not always. Any experience with these problems? Think my tuner just didn't do a great job? Maybe partial boost can't be tuned for? Any input is appreciated, thanks
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Old 02-06-2015, 03:31 PM   #2
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Quote:
Originally Posted by Brentap19506 View Post
I guess I'm looking for input from other vortech guys on here. I installed a V1, non intercooled, 8lb pulley. 42# inj, 90mm MAF, etc, etc. I have all the supporting mods I need and dyno tuned by reputable shop. I've put about 500-1000 miles on it but have a few concerns:

1) It MUST warm up before driving. If i try to start it and drive, it will stutter, spit, and bog until my coolant temp reaches about 100. It idles great in the meantime.

2) After releasing the throttle A/F drops down to 10-11 for about 3-5 seconds which feels like it's flooded when I go to accelerate again. Meaning that the car feels a little bogged down afterwards for a few seconds till it clears out.

3) After a partial boost acceleration, I seem to have a small amount of detonation/backfiring on decel.



The car drives amazing at WOT and idles perfect. It seems to be that all the in-between stuff messes with fuel delivery sometimes, but not always. Any experience with these problems? Think my tuner just didn't do a great job? Maybe partial boost can't be tuned for? Any input is appreciated, thanks

Sounds like maybe your O2 sensors are shot or getting there atleast.


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Old 02-06-2015, 04:06 PM   #3
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That'd be an easy fix. But I don't have any codes being thrown for them, at least not yet. The car has only been acting up after getting tuned. I was just wanting to know if this could be due to a bad tune or that it's really hard to get an N/A car right after boosting it. I could look into replacing the O2 sensors anyway though, thanks for the suggestion. It's approaching 100k miles
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Old 02-06-2015, 05:51 PM   #4
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Yeah I'd start with that. My car would sputter a lot when starting up until things got warm. When I dot my tune, my tuner told me it's because the O2 sensors were getting old and had to warm up so the sputter would go away. I did and the problem went away completely.



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Old 02-06-2015, 06:03 PM   #5
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Same here, I had a lazy o2 sensor which threw no codes. Lots of sputtering and the like. Replaced, no more problems

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