how do you make air pump blow all the time?
02-15-08, 03:38 PM
#51
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You CANNOT go into closed loop any lower than the engine can take a stoic (14.7-1) mixture. So for stock ports that about 2000 RPM.
Unless that is you are running the car in closed loop off a WB, AND your fuel computer is capable of having different AFR targets for different RPM's
The haltech E8/E11 has a 32 x 32 AFR target MAP for closed loop, I run closed loop up to 5PSI under load up to 75% throttle with a 15% + 10% - correction
If the car try's to go into closed loop with air switched to the ports then it will probably run rich as the ecu will sense that its leaner than it is and want to richen it up.
Unless that is you are running the car in closed loop off a WB, AND your fuel computer is capable of having different AFR targets for different RPM's
The haltech E8/E11 has a 32 x 32 AFR target MAP for closed loop, I run closed loop up to 5PSI under load up to 75% throttle with a 15% + 10% - correction
If the car try's to go into closed loop with air switched to the ports then it will probably run rich as the ecu will sense that its leaner than it is and want to richen it up.
About that comment of mine about the ECU not going into closed loop at 15mph or 25mph. On a normal ACV that has not been fooled with, then the ECU will go into closed loop or might not go into closed loop at those speeds.
It depends a bit on what your right foot is doing. If real gentle on the throttle, then it might not go closed loop because the Relief solenoid is energized and the Switching not energized.
If the pedal has a bit more aggressive, then the switching solenoid gets energized (kills air to the exhaust ports and feeds the split air pipe), then the engine goes closed loop because of no Port air being fed into the exhaust ports and being mixed with the *real* exhaust gases.
I'm under the impression that IF the afr is too lean, the ECU won't go closed loop beacause it can't trim the lean mixture to the 14.7AFR range.
More often than not I run with no airpump/acv and I go into closed loop at lower speeds much more often. How much more. Never counted.
Anyway, duing those tests at 15 and 25mph it almost does not matter. The afr if read on a wideband will be in the 15's or 16's afr when not in closed loop anyway.
Series four ACV dumps all the air at 3800rpm and sometimes earlier. Depends on the manipulation of the right pedal (TPS signal and manifold pressure).
I see what your talking about. Just rambling on. I'll look and see how low of a rpm I can go to get in closed loop. I've a car right now with no converter/acv/airpump.
Anyway, I'm done.
It depends a bit on what your right foot is doing. If real gentle on the throttle, then it might not go closed loop because the Relief solenoid is energized and the Switching not energized.
If the pedal has a bit more aggressive, then the switching solenoid gets energized (kills air to the exhaust ports and feeds the split air pipe), then the engine goes closed loop because of no Port air being fed into the exhaust ports and being mixed with the *real* exhaust gases.
I'm under the impression that IF the afr is too lean, the ECU won't go closed loop beacause it can't trim the lean mixture to the 14.7AFR range.
More often than not I run with no airpump/acv and I go into closed loop at lower speeds much more often. How much more. Never counted.
Anyway, duing those tests at 15 and 25mph it almost does not matter. The afr if read on a wideband will be in the 15's or 16's afr when not in closed loop anyway.
Series four ACV dumps all the air at 3800rpm and sometimes earlier. Depends on the manipulation of the right pedal (TPS signal and manifold pressure).
I see what your talking about. Just rambling on. I'll look and see how low of a rpm I can go to get in closed loop. I've a car right now with no converter/acv/airpump.
Anyway, I'm done.
02-15-08, 04:38 PM
#52
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Not in disagreement. The FSM for a 87 has a check to see if the ECU goes into closed loop. It has you disconnect the neutral switch (can do the same by putting the shift lever into any gear with clutch pushed in), disconnect the TPS, then with the engine running, increase the rpms b/t 1500rpm and 2000rpm. The result is the Green light on their Digital Code checker flashing on/off more than eight times in ten seconds.
Instead of a Digital Checker one can just put a LED on the two middle sockets of the green check connector in the engine bay and watch that light. I've done this before and it's usually over 1500rpm closer to 1700rpm if memory serves.
I can also watch the PALM connected to the RTEK2.0 and see when closed loop happens. Done for sure now.
Instead of a Digital Checker one can just put a LED on the two middle sockets of the green check connector in the engine bay and watch that light. I've done this before and it's usually over 1500rpm closer to 1700rpm if memory serves.
I can also watch the PALM connected to the RTEK2.0 and see when closed loop happens. Done for sure now.
02-27-08, 11:58 AM
#53
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Got a quick question on this.
In the UK, the Turbo II 2nd Gen can be tested on a less stricter emissions test, and can pass without a CAT. I have a Racing Beat exhaust system with no CAT, and with the ACV and air pump still on the car, it passed as follows:
0.44 % CO (3.5% allowed)
224 ppm HC (1200 ppm allowed)
I have since had the motor rebuilt, with street porting, and the emissions stuff and Air Pump are history. The car now struggles to meet the emissions test and I normally need to adjust the AFM bypass screw and use new spark plugs to get it to pass.
My question is this, in the UK the emissions are only checked on idle, so would it be possible for a smog pump wired to come on when the port air solenoid signal is present, feeding through a check valve such as you would use on the CAT feed and into the blanking plate where the port air used to go ?
I suspect this should work, as I passed without split air (no CAT, no pipe), and the relief air just goes nowhere, so only port air could have been allowing the car to pass.
Any thoughts ?
In the UK, the Turbo II 2nd Gen can be tested on a less stricter emissions test, and can pass without a CAT. I have a Racing Beat exhaust system with no CAT, and with the ACV and air pump still on the car, it passed as follows:
0.44 % CO (3.5% allowed)
224 ppm HC (1200 ppm allowed)
I have since had the motor rebuilt, with street porting, and the emissions stuff and Air Pump are history. The car now struggles to meet the emissions test and I normally need to adjust the AFM bypass screw and use new spark plugs to get it to pass.
My question is this, in the UK the emissions are only checked on idle, so would it be possible for a smog pump wired to come on when the port air solenoid signal is present, feeding through a check valve such as you would use on the CAT feed and into the blanking plate where the port air used to go ?
I suspect this should work, as I passed without split air (no CAT, no pipe), and the relief air just goes nowhere, so only port air could have been allowing the car to pass.
Any thoughts ?
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