Puzzling sharkplotter results - Mystery solved!
11-21-2009, 07:04 PM
#16
Race Car
Hi Dan
The reason for this automatic parameter is to prevent the pulse width at idle/low loads becoming too short for reliable operation i.e when the injector opening time is too close to the programmed injector pulse width.
The changeover point assumes that poundage injector running at its rated fuel pressure. If you lower the fuel pressure the atomisation of fuel suffers, raising fuel pressure will force Tinj lower but in the "enhanced mode" the system will cope with that.
As there is no diadvantge of enhanced mode that we are aware of, what is the problem you wish to address ?
The reason for this automatic parameter is to prevent the pulse width at idle/low loads becoming too short for reliable operation i.e when the injector opening time is too close to the programmed injector pulse width.
The changeover point assumes that poundage injector running at its rated fuel pressure. If you lower the fuel pressure the atomisation of fuel suffers, raising fuel pressure will force Tinj lower but in the "enhanced mode" the system will cope with that.
As there is no diadvantge of enhanced mode that we are aware of, what is the problem you wish to address ?
Dan
'91 928GT S/C
475hp/460lb.ft
11-22-2009, 07:04 AM
#17
Rennlist Member
Hi Dan
I don't think there would be a problem with not having the LH switch to enhanced mode in that situation, other than poor injector atomisation due to less that rated fuel pressure for the injectors. (PorKen has found a 55psi FPR on an 85/86 car is a benefit)
It would be wise when running such a combination as you speculate to datalog Tinj at idle to confirm that Tinj is at least 0.5mS longer than the Topen setting.
I don't think there would be a problem with not having the LH switch to enhanced mode in that situation, other than poor injector atomisation due to less that rated fuel pressure for the injectors. (PorKen has found a 55psi FPR on an 85/86 car is a benefit)
It would be wise when running such a combination as you speculate to datalog Tinj at idle to confirm that Tinj is at least 0.5mS longer than the Topen setting.