car_guy81
Probationary Member
- 4
- 0
- Jan 30, 2006
-
Farmington,
New_Mexico
I'm helping a buddy tune his GSX. A little background : he bought the car from a board member who just ran out of time, or money, or both and left the car needing a few things after a 1g Cyclone motor swap and manual transmission conversion. The car ran ok, as he did drive it about 12 hours home from LA, but when we got it home we started going through the car and found many things wrong.
Multiple vacuum lines hooked up incorrectly, or not at all. Leaking throttlebody gasket, and a horribly tuned AFC(2000 rpm at -16/3000 rpm at +16 ) with stock injectors, afermarket fuel pump(not sure what size), running a Big 16g, and a fmic. Idle was very rough and throttle was not working properly, sticking throttle, and very high idle.
Work done so far: Since we have got the car we have found vacuum diagrams and corrected all vacuum leaks (we think) and the throttlebody gasket leak. Installed new 660cc injectors, checked and corrected timing, BISS, and TPS. We have tuned the AFC on Low Throttle at 30% according to fuel trims with a logger and High Throttle at 80% according to OEM O2 voltage, EGTs, and watching timing advance.
This is what we have done so far, and it is completely possible that we could have missed something with the throttle or vacuum lines.
Current problem: This problem came about when we were tuning for high throttle fuel settings. After a WOT run he would push in the clutch and slow down so we could look at the data and adjust settings. When he would push in the clutch instead of returning to idle the car would just die. With a small blip of the throttle as it returns to idle it can be kept from dying. Now we have experimented and found that it will even do this at low RPM and lower throttle. In 2nd gear you can put the throttle at 30%, go from 2000-3000 RPMs and then push in the clutch, instead of returning to idle the car will die . Other than that the car runs great! Everything seems great at WOT and while just cruising around town, you just can not push in the clutch and let it return to idle as you come to a stop without giving it some gas to keep from dying.
Any help would be appreciated. Thanks in advance for the help.
Multiple vacuum lines hooked up incorrectly, or not at all. Leaking throttlebody gasket, and a horribly tuned AFC(2000 rpm at -16/3000 rpm at +16 ) with stock injectors, afermarket fuel pump(not sure what size), running a Big 16g, and a fmic. Idle was very rough and throttle was not working properly, sticking throttle, and very high idle.
Work done so far: Since we have got the car we have found vacuum diagrams and corrected all vacuum leaks (we think) and the throttlebody gasket leak. Installed new 660cc injectors, checked and corrected timing, BISS, and TPS. We have tuned the AFC on Low Throttle at 30% according to fuel trims with a logger and High Throttle at 80% according to OEM O2 voltage, EGTs, and watching timing advance.
This is what we have done so far, and it is completely possible that we could have missed something with the throttle or vacuum lines.
Current problem: This problem came about when we were tuning for high throttle fuel settings. After a WOT run he would push in the clutch and slow down so we could look at the data and adjust settings. When he would push in the clutch instead of returning to idle the car would just die. With a small blip of the throttle as it returns to idle it can be kept from dying. Now we have experimented and found that it will even do this at low RPM and lower throttle. In 2nd gear you can put the throttle at 30%, go from 2000-3000 RPMs and then push in the clutch, instead of returning to idle the car will die . Other than that the car runs great! Everything seems great at WOT and while just cruising around town, you just can not push in the clutch and let it return to idle as you come to a stop without giving it some gas to keep from dying.
Any help would be appreciated. Thanks in advance for the help.