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OnThr3 · 05-08-2020, 01:53 PM

Preface: 2018 SS A8 MODS: Axleback exhaust only

I recently installed a whipple with my father (who built cars/engines his whole life) and had nothing but issues. The install itself wasn't terrible. We followed all the directions and took our time so install took around 25 hours to complete. Biggest thing we had trouble with was putting the AC belt on but we had the dealership do it and they got it on for us. Now for the most frustrating part.... the tune. It has been a little over a month since the car has had the whipple on first start was great let it idle for a long time (all on the whipple supplied tune.) It was late so the next day we go for the first drive. Drive the car barely cruising around and once I gave it any throttle ANY throttle... spark blowout car sounds like its 2 stepping with any throttle at all. We changed the plugs during the install and gapped them to .035 just as the instructions had told us to do. Ok no big deal right? Contacted the whipple "engineer" that had done my tune and whom was assigned to my case and he told me to change the gap from the plugs from .035 to .027. Ok no big deal. We did so loaded his new tune with the appropriate gap that was expected same problem probably worse. The "engineer" has sent me over 10 revisions to the same tune and nothing will work still 2 step backfires under any load at all. Finally the guy finds "the problem." Tells me to go to the dealership and have my Operating System updated and tells me that will fix it. Call the dealership, schedule an appointment for the next day, costs about 200 dollars to have the OS updated, get the car back, load the new tune with the updated OS. DOESN'T WORK. SAME ISSUE. The engineer gives me another 3 more revised tune files and none of them fixes the problem. At this point we are pissed. I called whipple and asked if I could speak to a higher up to take my case and see what's going on with the car. They tell me no you have an engineer assigned to your case only thing you can do is correspond with him. It was the weekend at this point and I needed a break. Finally when Monday comes the "engineer" tells me "we have never had luck running plugs with that low of gap. Change it back to .035". NICE TUNE WHIPPLE $7,000 dollars worth for sure. Call a local tuner looks at the tune for 5 minutes and tells me everything wrong with it tells me i'm still getting spark blowout. We decide to go with BRISK silver plugs and gap them to .022 fixes the spark blowout car runs 90% better than it did. It still missfires at 4th and 5th gear around 5,500 rpm on up. This has been an absolute hell of a ride to go on and I'm still looking for feedback on what could be causing this issue. We did a smoke test on the supercharger itself and know its not leaking. We are getting 3 codes. The first code at this point is a throttle position sensor code, the second is a catalyst code (we aren't too worried about this one as we know it is getting messed up from having boost), and a MAF sensor code. Has anyone experienced cutting out at high rpms almost like a stutter with a supercharger? PLEASE HELP.

edit: My tuner and I took a long look through the logs and found I'm running above average boost at almost 8.5 pounds.... note: 3.625 upper Whipple pulley. Could this be causing that cutout in high rpm's under WOT??? I know with longtubes and a full exhaust it'll drop my boost a bit so could that solve the issue??

05-08-2020, 01:53 PM	#1
OnThr3 Drives: 2018 Chevy Camaro ss Join Date: Apr 2020 Location: Missouri Posts: 28	Whipple HELP Preface: 2018 SS A8 MODS: Axleback exhaust only I recently installed a whipple with my father (who built cars/engines his whole life) and had nothing but issues. The install itself wasn't terrible. We followed all the directions and took our time so install took around 25 hours to complete. Biggest thing we had trouble with was putting the AC belt on but we had the dealership do it and they got it on for us. Now for the most frustrating part.... the tune. It has been a little over a month since the car has had the whipple on first start was great let it idle for a long time (all on the whipple supplied tune.) It was late so the next day we go for the first drive. Drive the car barely cruising around and once I gave it any throttle ANY throttle... spark blowout car sounds like its 2 stepping with any throttle at all. We changed the plugs during the install and gapped them to .035 just as the instructions had told us to do. Ok no big deal right? Contacted the whipple "engineer" that had done my tune and whom was assigned to my case and he told me to change the gap from the plugs from .035 to .027. Ok no big deal. We did so loaded his new tune with the appropriate gap that was expected same problem probably worse. The "engineer" has sent me over 10 revisions to the same tune and nothing will work still 2 step backfires under any load at all. Finally the guy finds "the problem." Tells me to go to the dealership and have my Operating System updated and tells me that will fix it. Call the dealership, schedule an appointment for the next day, costs about 200 dollars to have the OS updated, get the car back, load the new tune with the updated OS. DOESN'T WORK. SAME ISSUE. The engineer gives me another 3 more revised tune files and none of them fixes the problem. At this point we are pissed. I called whipple and asked if I could speak to a higher up to take my case and see what's going on with the car. They tell me no you have an engineer assigned to your case only thing you can do is correspond with him. It was the weekend at this point and I needed a break. Finally when Monday comes the "engineer" tells me "we have never had luck running plugs with that low of gap. Change it back to .035". NICE TUNE WHIPPLE $7,000 dollars worth for sure. Call a local tuner looks at the tune for 5 minutes and tells me everything wrong with it tells me i'm still getting spark blowout. We decide to go with BRISK silver plugs and gap them to .022 fixes the spark blowout car runs 90% better than it did. It still missfires at 4th and 5th gear around 5,500 rpm on up. This has been an absolute hell of a ride to go on and I'm still looking for feedback on what could be causing this issue. We did a smoke test on the supercharger itself and know its not leaking. We are getting 3 codes. The first code at this point is a throttle position sensor code, the second is a catalyst code (we aren't too worried about this one as we know it is getting messed up from having boost), and a MAF sensor code. Has anyone experienced cutting out at high rpms almost like a stutter with a supercharger? PLEASE HELP. edit: My tuner and I took a long look through the logs and found I'm running above average boost at almost 8.5 pounds.... note: 3.625 upper Whipple pulley. Could this be causing that cutout in high rpm's under WOT??? I know with longtubes and a full exhaust it'll drop my boost a bit so could that solve the issue?? Last edited by OnThr3; 05-10-2020 at 11:51 AM.