Dual pulleys - tune - pushed hard on street - some codes?
#21
It was indeed the VAP tune. Too much timing uptop. Got with stuart and chris, and chris had me a new tune in a day or two. Pulled a few degrees of timing from up top, as it was pushing the stock coil packs too hard, and then shutting down the fuel injector, which is causing your limp mode. I replaced ALL my coils with brand new OEM limits, but it made no difference.
When I take it to the dyno, I will log it to see the absolute max we can push a V8 w/ no cats & dual pulleys. If you havnt changed the plugs for the additional boost, you absolutely should.
When I take it to the dyno, I will log it to see the absolute max we can push a V8 w/ no cats & dual pulleys. If you havnt changed the plugs for the additional boost, you absolutely should.
any movement with this? mine started missing for a split second right before hard acceleration, then pulls fine. hoping its simple. no hard codes, haven't check soft codes yet.
#22
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Itismejoshy (10-17-2018)
#23
#24
I think I may be having this same issue, I installed my Velocity tune and crank pulley last week. The car ran great for the first two days.. but then I started to get jerky acceleration/hesitation in the higher rpm's around 6K RPM. I noticed unburnt fuel when shifting gears and a gas smell, shortly after I had an O2 sensor go bad..
I replaced that O2 sensor and spoke with Chris. He sent me a new file with less timing, I installed and it gave it a go. This time I was able to accelerate hard for two full gears before I got a flashing check engine light. Thankfully, I was right outside my neighborhood so I pulled in, turned the car off and read the codes. P0300 (mult random misfire) Cylinder 6,7 misfire and a P1315 (persistent misfire/injector switched off).
What's bizarre is when I started the car the next day for a data log, I had no CEL and the car was running fine like nothing happened.
I have OEM coils and plugs.. I wasn't aware I needed colder ones. Could that be the answer? I also plan to check the MAF tomorrow too.
Any help would be greatly appreciated!
I replaced that O2 sensor and spoke with Chris. He sent me a new file with less timing, I installed and it gave it a go. This time I was able to accelerate hard for two full gears before I got a flashing check engine light. Thankfully, I was right outside my neighborhood so I pulled in, turned the car off and read the codes. P0300 (mult random misfire) Cylinder 6,7 misfire and a P1315 (persistent misfire/injector switched off).
What's bizarre is when I started the car the next day for a data log, I had no CEL and the car was running fine like nothing happened.
I have OEM coils and plugs.. I wasn't aware I needed colder ones. Could that be the answer? I also plan to check the MAF tomorrow too.
Any help would be greatly appreciated!
#25
You don't "need" colder plugs, but the performance of your engine can benefit from them, and they are a good idea with the boost in power. The general rule of thumb is for every 100 hp added, you drop 1 temperature range. That being said, I imagine your issue isn't directly related to the tune, though it may be exacerbated by it. Perhaps the plugs got fouled, or there's an issue with a coil. You'll need to diagnose the misfire.
#26
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I think I may be having this same issue, I installed my Velocity tune and crank pulley last week. The car ran great for the first two days.. but then I started to get jerky acceleration/hesitation in the higher rpm's around 6K RPM. I noticed unburnt fuel when shifting gears and a gas smell, shortly after I had an O2 sensor go bad..
I replaced that O2 sensor and spoke with Chris. He sent me a new file with less timing, I installed and it gave it a go. This time I was able to accelerate hard for two full gears before I got a flashing check engine light. Thankfully, I was right outside my neighborhood so I pulled in, turned the car off and read the codes. P0300 (mult random misfire) Cylinder 6,7 misfire and a P1315 (persistent misfire/injector switched off).
What's bizarre is when I started the car the next day for a data log, I had no CEL and the car was running fine like nothing happened.
I have OEM coils and plugs.. I wasn't aware I needed colder ones. Could that be the answer? I also plan to check the MAF tomorrow too.
Any help would be greatly appreciated!
I replaced that O2 sensor and spoke with Chris. He sent me a new file with less timing, I installed and it gave it a go. This time I was able to accelerate hard for two full gears before I got a flashing check engine light. Thankfully, I was right outside my neighborhood so I pulled in, turned the car off and read the codes. P0300 (mult random misfire) Cylinder 6,7 misfire and a P1315 (persistent misfire/injector switched off).
What's bizarre is when I started the car the next day for a data log, I had no CEL and the car was running fine like nothing happened.
I have OEM coils and plugs.. I wasn't aware I needed colder ones. Could that be the answer? I also plan to check the MAF tomorrow too.
Any help would be greatly appreciated!
Keep us posted!
DC
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