Anyone with spare time on their hands? Accel Gen 7 ver 5
Just wondering if someone can make me up a global file that will at least get me idleing and not stalling so i can at least buy a vowel and get a clue how to tune this thing. I have little to no vacuum and i am clueless as to what to do. Here are the specs:
Running Factory Distributor and a MSD 6a box with a Blaster 2 coil.
New Cap, Rotor, Wires, and Plugs
Standard Map sensor that came with the kit, and standard O2 sensor that came with it.
The Motor is a 420 cube small block, 4.155 bore 3.875 stroke
AFR 210 RR heads
11.3:1 Compression
TPIS Miniram (port matched to heads)
Accel 44 lb injectors
TPIS 700-702 Solid Roller Cam
252 @ .050 intake and exhaust
.660 lift both I/E
1 3/4 Primary TPIS headers
into 3" Mandrel bent duals, X-Pipe, and Borla XR-1 race mufflers - No Cats
Anything I am missing let me know,
My AIM messenger account is
GOLD86VETTE
If someone has a similar combo and could help out i would appreciate it.
thanks to everyone,
Larry
Where to set timing and fuel pressure?
First - disable closed loop fueling (Configuration -> Controls from the menu). You can't get stable readings and establish an initial tune while the O2 sensor is busy trying to correct.
Second - set your crank index offset degrees (Configuration -> System menu) to 6 degrees (you had this set to zero).
Third - Get your ignition timing in sync with the DFI unit. On the main screen, check the "forced timing" box and enter 20 (you can do this with the engine running if you want). Then, with your timing light, set the distributor to where the timing light shows 20 degrees on the timing marks on the dampner. Lock down the distributor. Now the actual timing is in sync with the DFI unit and you can uncheck that box.
Fourth - on your base VE table, increase the values in the 700 to 1200 rpm / 26 to 100 MAP ranges - it's too lean there based on the last file you sent me a while ago. You might also increase the values in the 1800 rpm range, but not as much. At 700rpm/54MAP for instance, you want to be at at least .550, and probably higher with your cam.
Fifth - try 12 degrees timing at 700, 14 at 1000, 18 at 1200, 24 at 1800 for a starting point.
Sixth - when you eventually re-enable closed loop fueling, which you might not ever want to do with that cam, you will probabaly only be able to run 14.51 a/f ratio at 1800 or 2200 rpms and above, but certainly not at idle and near idle speeds. You'll want to set your a/f targets in the lower rpm ranges to 13.5:1 or below. With a standard O2 sensor, anything below 14:1 will cause the DFI unit to operate in open loop mode in that range, even when closed loop fueling is enabled.
Dan I am going to spend a couple of hours with it on Sunday afternoon using your info and hopefully I will be able to get this sucker starting and running on its own.
Thank you for all your help,
Larry
Corvette Store
Anyone with spare time on their hands? Accel Gen 7 ver 5
