daryl337
10-12-2015, 01:26 PM
Good afternoon gents,
I've spent a considerable amount of time going thru things and I'm unfortunately at the point where I am a little stumped - So before I talk about the issue I want to rule out/advise you of the following:
I have an old Haltech E8 on a redtop SR.
Deatschwerks 810cc injectors
Tomei 270 solids.
Lowered compression 1/2 a point ~ 140psi compression across the board on all.
Decent vacuum considering the cams ~ around 15 in hg.
Cams are correctly installed
3BAR map.
I've calibrated the TPS.
BKR7E plugs gapped ~ .028"
Injector dead time map is set up as close as I can get (using 740cc dead times on website - 810's no longer available and they don't have them up there)
This thing just does not idle smoothly. I had bring the idle up to ~11-1300 to keep it from falling on its face. I figured the extra duration in the cam might be responsible for this - don't know what other SR users run for an idle with these cams.
AFR's are rich - this car does not like to idle at any mixture leaner than 12.5 AFR. I can't tell if it is because I am already skirting below the minimum pulse width of the injector (listed as 1.2 ms vs. my ecu's map of 1.36 - battery corrected to less than recommended) or if the car just wants to idle higher.
The car definitely has an intermittent misfire while idling, and it seems more tune related - as the misfire disappears once I give it some throttle and hold it. As a matter of fact - once I got into properly leaning out my throttle mixtures under partial throttle the car ran great while driving. WOT needs adjustment - but that's more because of the big turbo. I suspect it loading the plugs up at idle, and then cleaning themselves out once I bring it up over 2K rpms.
My issue is this idle - do any of you have any experience running the 810 cc injectors? What were your AFR's like at idle? Idle quality?
I've been considering converting over to a top feed set up like the ID system - does anyone happen to know the recommended minimum pulse width of the ID1300? Their website doesn't seem to list it specifically, and their tech line just runs to a voicemail that didn't get back to me.. - but their Cobb spreadsheet seems to hint at a .420 ms min pulse width. Could anyone running these confirm? At ~1/3 of the minimum pulse width I should be able to get away with a leaner and cleaner idle, no?
Also, if any of you guys are tuning gurus (cough cough STEVE), what amount of fuel do you guys usually run during cranking for start up? If you don't have any idea it is no biggy. Just the laziness in me, didn't want to play with it more than I had to.
Any other suggestions to achieve a smoother idle with this set up?
I've spent a considerable amount of time going thru things and I'm unfortunately at the point where I am a little stumped - So before I talk about the issue I want to rule out/advise you of the following:
I have an old Haltech E8 on a redtop SR.
Deatschwerks 810cc injectors
Tomei 270 solids.
Lowered compression 1/2 a point ~ 140psi compression across the board on all.
Decent vacuum considering the cams ~ around 15 in hg.
Cams are correctly installed
3BAR map.
I've calibrated the TPS.
BKR7E plugs gapped ~ .028"
Injector dead time map is set up as close as I can get (using 740cc dead times on website - 810's no longer available and they don't have them up there)
This thing just does not idle smoothly. I had bring the idle up to ~11-1300 to keep it from falling on its face. I figured the extra duration in the cam might be responsible for this - don't know what other SR users run for an idle with these cams.
AFR's are rich - this car does not like to idle at any mixture leaner than 12.5 AFR. I can't tell if it is because I am already skirting below the minimum pulse width of the injector (listed as 1.2 ms vs. my ecu's map of 1.36 - battery corrected to less than recommended) or if the car just wants to idle higher.
The car definitely has an intermittent misfire while idling, and it seems more tune related - as the misfire disappears once I give it some throttle and hold it. As a matter of fact - once I got into properly leaning out my throttle mixtures under partial throttle the car ran great while driving. WOT needs adjustment - but that's more because of the big turbo. I suspect it loading the plugs up at idle, and then cleaning themselves out once I bring it up over 2K rpms.
My issue is this idle - do any of you have any experience running the 810 cc injectors? What were your AFR's like at idle? Idle quality?
I've been considering converting over to a top feed set up like the ID system - does anyone happen to know the recommended minimum pulse width of the ID1300? Their website doesn't seem to list it specifically, and their tech line just runs to a voicemail that didn't get back to me.. - but their Cobb spreadsheet seems to hint at a .420 ms min pulse width. Could anyone running these confirm? At ~1/3 of the minimum pulse width I should be able to get away with a leaner and cleaner idle, no?
Also, if any of you guys are tuning gurus (cough cough STEVE), what amount of fuel do you guys usually run during cranking for start up? If you don't have any idea it is no biggy. Just the laziness in me, didn't want to play with it more than I had to.
Any other suggestions to achieve a smoother idle with this set up?