Fast 102 & 102 TB - Popping through exhaust
06-22-2013, 06:09 PM
#1
Fast 102 & 102 TB - Popping through exhaust I have a head/cam LS1 that I just put a Fast 102 intake and 102 TB. I have NOT yet had it re-tuned to match. I'm trying to get things up and running (was doing a dozen other things while I had it apart).
When I start the car, it pops hard out of the EXHAUST at idle. I can rev it up and hold it at a higher idle and that goes away.
I suspect it is extremely lean now in the idle range (36# injectors).
No MIL (as of yet) - just trying to get it warmed up to top off fluids, etc. I have a dyno tune date on 7/8 pending - but don't want to roll in there with it doing this IF this isn't a tune issue.
Prior to this with an LS6 intake and stock tb on the 36# injectors it ran great and put down 377 at the rear wheels at speed inc.
Is this common when swapping up PRIOR to the tune?
When I start the car, it pops hard out of the EXHAUST at idle. I can rev it up and hold it at a higher idle and that goes away.
I suspect it is extremely lean now in the idle range (36# injectors).
No MIL (as of yet) - just trying to get it warmed up to top off fluids, etc. I have a dyno tune date on 7/8 pending - but don't want to roll in there with it doing this IF this isn't a tune issue.
Prior to this with an LS6 intake and stock tb on the 36# injectors it ran great and put down 377 at the rear wheels at speed inc.
Is this common when swapping up PRIOR to the tune?
06-22-2013, 06:17 PM
#2
I have a head/cam LS1 that I just put a Fast 102 intake and 102 TB. I have NOT yet had it re-tuned to match. I'm trying to get things up and running (was doing a dozen other things while I had it apart).
When I start the car, it pops hard out of the EXHAUST at idle. I can rev it up and hold it at a higher idle and that goes away.
I suspect it is extremely lean now in the idle range (36# injectors).
No MIL (as of yet) - just trying to get it warmed up to top off fluids, etc. I have a dyno tune date on 7/8 pending - but don't want to roll in there with it doing this IF this isn't a tune issue.
Prior to this with an LS6 intake and stock tb on the 36# injectors it ran great and put down 377 at the rear wheels at speed inc.
Is this common when swapping up PRIOR to the tune?
When I start the car, it pops hard out of the EXHAUST at idle. I can rev it up and hold it at a higher idle and that goes away.
I suspect it is extremely lean now in the idle range (36# injectors).
No MIL (as of yet) - just trying to get it warmed up to top off fluids, etc. I have a dyno tune date on 7/8 pending - but don't want to roll in there with it doing this IF this isn't a tune issue.
Prior to this with an LS6 intake and stock tb on the 36# injectors it ran great and put down 377 at the rear wheels at speed inc.
Is this common when swapping up PRIOR to the tune?
06-23-2013, 03:20 PM
#6
I put a quick video together. I had to get it where it would idle long enough and strong enough to charge the new Vintage Gen IV a/c system. So, I slotted out a TPS and for the idle running it takes nearly all the pop out of the exhaust. I shot this video with the TPS in the stock spot and you can hear the distinct popping - sounds like a cheap .22 going off in a back alley. Then I ran the TPS up and started it again.
Was able to charge the a/c this way.
I don't want to trailer up to the dyno then find out I've got something else going on that delays that.
Was able to charge the a/c this way.
I don't want to trailer up to the dyno then find out I've got something else going on that delays that.
06-25-2013, 04:42 PM
#7
problem solved - I did indeed mix up the coil input wires on bank 2. Pulled a schematic today and came home to compare. I want to be humble enough to admit regardless of my best intentions to mark what came apart - when I pulled them out of the loom to hook to the relocation bracket I goofed. Man...it sounds SOOOOO good back among the land of the healthy living.
