Update on the coupe
03-06-2018, 01:50 PM
#22
Well, who wants to take bets on if my car will speed up or slow down with the EFI? Going to keep a vic jr, use a 4150 1200 CFM eBay throttle body, so not really changing much except for the injection system itself.
I think torque will come in quicker.
I think torque will come in quicker.
03-06-2018, 02:21 PM
#23
TECH Senior Member
If the CFM and fuel are up to the carbureted levels or better, I think you will get more power.
03-28-2018, 05:34 PM
#30
I had a few things non-tune related that caused popping and banging.
I lost a valve spring in my ls2 on my first ever pass. it would idle perfect and rev to 7k rpm clean in park/neutral. when it put it under load it would **** all over itself. I made 5 passes with a broken spring and somehow didn't hurt anything LOL. maybe you don't have a broken spring, but weak springs that only rear their ugly heads under load.
the other time was MSD related. something in the wiring harness wasn't getting a great connection and it would randomly start popping and banging. I would pull the harness out of the loom to inspect, find nothing, stuff it all back into the loom and suddenly the issue was 100% gone. a month later it would do it again. I inspected the loom 3 times and decided to part the truck out before replacing the MSD wiring harness.
I lost a valve spring in my ls2 on my first ever pass. it would idle perfect and rev to 7k rpm clean in park/neutral. when it put it under load it would **** all over itself. I made 5 passes with a broken spring and somehow didn't hurt anything LOL. maybe you don't have a broken spring, but weak springs that only rear their ugly heads under load.
the other time was MSD related. something in the wiring harness wasn't getting a great connection and it would randomly start popping and banging. I would pull the harness out of the loom to inspect, find nothing, stuff it all back into the loom and suddenly the issue was 100% gone. a month later it would do it again. I inspected the loom 3 times and decided to part the truck out before replacing the MSD wiring harness.
05-08-2018, 10:37 PM
#35
She rockin and rolling at the moment. TPS was reading half because the throttle stuck against the scoop. Fixed that. Idle air was wired backwards. Fixed that. A wire for the harness disconnected and wasn’t firing all injectors. So, it will idle and run. Going to dial it in tomorrow.
05-10-2018, 11:01 AM
#36
Tuned it on motor yesterday. I loved the carb when it was right, but this thing is day and night. There is not a recovery waiting to get to optimal air fuel now. Stupid snappy throttle. She pegged 139 MPH on the last run tuning. That was 7350 RPM on a 26” tire. So on a 28 I am sure I can run the 1/4 if I wanted to. It’s a whole new ride to be honest.
05-12-2018, 06:33 AM
#37
So far she is down 2 Mph average but 3 MPh over my best. Down .1 over my best as well. We will dyno the car and see if there is some hidden power in there somewhere, but it is disappointing to say the least. Too bad the pro systems was acting shittier by the day, or I wosidnt have even swapped.
05-12-2018, 10:16 AM
#39
Yup. I am going to put it on the dyno to see what it wants. May be able to get it back, or faster if I’m lucky. No telling.
went from carb with 33.5 degrees to EFI with 27 degrees timing. So we will see if the dyno shows it wanting more fuel and or timing.
