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WhoMadeWho · 08-16-2011, 01:42 AM

Hey guys,
Here's my situation. I had an LS3 376ci with an upgraded cam and Whipple SC in my 2010 Camaro. It ran great until an exhaust valve dropped and tore up the engine. So, I had Livernois build a stroked LS3 with forged internals and better heads as a replacement. The engine went from 376ci at 10.7:1 to 419ci at 9.7:1. The cam profiles are the same except the new motor has a narrower LSA of 114. The other change is that I installed a set of Injector Dynamic's ID850 injectors as part of the new engine reassembly.

To get the car running, I used my previous tune as a basis and changed the fuel injector values as recommended by ID using the data they provide on their website. Other than that, I've not changed anything.

The car fired up and idled fine, the initial break in procedure (driving it and varying between 1500-2500 rpm for about 2 minutes) it seemed to run ok. For the second stage of the break in they recommend driving the car and varying the rpm from 2500-5000rpm while gradually increasing the load via 50% throttle to 90% throttle. This is where the problems surfaced; the engine hesitates/cuts out during moderate to heavy throttle up transitions. I also notice much more deceleration popping from the exhaust.

I was scanning during the break-in runs and did not notice anything out of whack, except the AFR was a bit lean at times (14-15) but nothing too bad.

There are no miss fire DTC's, which surprised me since the hesitation under acceleration feels like a miss fire.

08-16-2011, 01:42 AM	#1
WhoMadeWho Liberty vs Tyranny Drives: 2010 SS/RS M6 Inferno Orange Join Date: Jul 2011 Location: Florida Posts: 98	Hesitation During Acceleration Hey guys, Here's my situation. I had an LS3 376ci with an upgraded cam and Whipple SC in my 2010 Camaro. It ran great until an exhaust valve dropped and tore up the engine. So, I had Livernois build a stroked LS3 with forged internals and better heads as a replacement. The engine went from 376ci at 10.7:1 to 419ci at 9.7:1. The cam profiles are the same except the new motor has a narrower LSA of 114. The other change is that I installed a set of Injector Dynamic's ID850 injectors as part of the new engine reassembly. To get the car running, I used my previous tune as a basis and changed the fuel injector values as recommended by ID using the data they provide on their website. Other than that, I've not changed anything. The car fired up and idled fine, the initial break in procedure (driving it and varying between 1500-2500 rpm for about 2 minutes) it seemed to run ok. For the second stage of the break in they recommend driving the car and varying the rpm from 2500-5000rpm while gradually increasing the load via 50% throttle to 90% throttle. This is where the problems surfaced; the engine hesitates/cuts out during moderate to heavy throttle up transitions. I also notice much more deceleration popping from the exhaust. I was scanning during the break-in runs and did not notice anything out of whack, except the AFR was a bit lean at times (14-15) but nothing too bad. There are no miss fire DTC's, which surprised me since the hesitation under acceleration feels like a miss fire.