technical pulsewidth/ignition question (Accel DFI)
Thread Starter
Registered User
Joined: Mar 2003
Posts: 26
From: Troy, NY
technical pulsewidth/ignition question (Accel DFI)
I've been battling with the Accel DFI gen6 and getting it tuned properly the cheap way (my way) with my bone-stock `95 Z28 LT1. I've messed around with many suggestions from EMICs, general LT1 information, dyno software, etc. to no avail. What I'm really looking for are basic fuel pulse width numbers and a stock ignition timing map. Both in reference to engine RPM vs engine LOAD (map value/percentage).
I'm basically looking for the stock fuel curve. I.E. what's the pulse width per injector in milliseconds when the engine is rev'd to 2000rpm with 10% load. Considering all variables like water temp and manifold air temp are at normal operating levels. I'm of course shooting for stoich, but that really doesn't matter cause I'm just looking for a base to start out with in my tuning.
To get a better idea of what I'm working with, check out http://numb.voxel.net/calmap/
I have a bunch of screenshots and the demo CALMAP 6.32 program availible there. I also have the files there that are complete snapshots of the entire calmap engine tune. There's one file there called JIMPAL2 which "one2try" from lt1tech.com who's an EMIC helped me out with (thanks for the help one2try!). Thought that was a decent base to work off but it's far from close. I've been unable to tweak that specific config to work properly.
I've tried the wonderful base fuel map generator program embedded in the CALMAP 6.32 software, but it's a little tough because of the nature of the LT1 and it's flat torque "curve". It calculates a simple fuel map based off max HP and TQ at specific RPMs, injector size/flowrate, cylinders, etc. Very handy but the fuel map it generates is consistently WAY too rich under every condition.
I was almost hoping someone else might have already had a bone-stock `95 Z28 with the accel dfi gen6 that would be generous enough to donate their config. Worth a try asking around.
This is truly turning into an epic saga that I did not intend with the purchase of this accel. The one oddity is that I never witnessed the engine running without the accel on it. I got the engine and accel at the same time so I have no frame of reference there. I've changed everything on the engine sensor-wise. still same results.
It's hard to tell if the engine would work perfectly under the stock ECM but it's a little too late to tell that.
anyways, thanks in advance for any help.
I'm basically looking for the stock fuel curve. I.E. what's the pulse width per injector in milliseconds when the engine is rev'd to 2000rpm with 10% load. Considering all variables like water temp and manifold air temp are at normal operating levels. I'm of course shooting for stoich, but that really doesn't matter cause I'm just looking for a base to start out with in my tuning.
To get a better idea of what I'm working with, check out http://numb.voxel.net/calmap/
I have a bunch of screenshots and the demo CALMAP 6.32 program availible there. I also have the files there that are complete snapshots of the entire calmap engine tune. There's one file there called JIMPAL2 which "one2try" from lt1tech.com who's an EMIC helped me out with (thanks for the help one2try!). Thought that was a decent base to work off but it's far from close. I've been unable to tweak that specific config to work properly.
I've tried the wonderful base fuel map generator program embedded in the CALMAP 6.32 software, but it's a little tough because of the nature of the LT1 and it's flat torque "curve". It calculates a simple fuel map based off max HP and TQ at specific RPMs, injector size/flowrate, cylinders, etc. Very handy but the fuel map it generates is consistently WAY too rich under every condition.
I was almost hoping someone else might have already had a bone-stock `95 Z28 with the accel dfi gen6 that would be generous enough to donate their config. Worth a try asking around.
This is truly turning into an epic saga that I did not intend with the purchase of this accel. The one oddity is that I never witnessed the engine running without the accel on it. I got the engine and accel at the same time so I have no frame of reference there. I've changed everything on the engine sensor-wise. still same results.
It's hard to tell if the engine would work perfectly under the stock ECM but it's a little too late to tell that.
anyways, thanks in advance for any help.
Thread
Thread Starter
Forum
Replies
Last Post
Camaro90RS
Drag Racing Technique
2
Jul 23, 2002 07:57 AM