FN2200 Spark Table

[olddog]

Just making certain my understanding is correct.

The base values in the A9L2 bin would run just fine in a bone stock 5.0 engine, therefore the values in FN2200 in the NA range pretty closely match the factory A9L timing. Correct?

I think this would be a very safe place to start. The MassFlo setup used a 19/36 curved Mass meter, so it under reported flow, thus calculated less load. This caused timing to be more advanced at a given load. Now I have 347 cid over the 302 cid in the A9L. So this offset the affect some. My engine at part throttle (less than the WOT trigger) would break the tires loose, when rolling into the throttle. When you floored it, it lost a bunch of power, because the timing switched to the WOT spark table. Floor it and it could not break the tires loose in 2nd gear. Roll into it, staying out of the WOT spark table, and it would smoke the tires. Several builders said my engine should need about 34 deg timing above 3000 - 3500 rpm at WOT. I will see what the engine needs later. No desire to hurt the engine. Oh I have always ran 93-94 octane pump gas.

All that said, I think the base A9l2 spark table should be conservative enough, while I am getting the fuel dialed in. Do you agree?

[decipha]

No, the a9l stock timing table is no where near optimal and is also setup for lower than 87 octane.

first you need to put your actual injector high slope in by itself.

second put sarchg to your actual engine size.

then plug in the rest of your injector data and change all the other SP** parameters back to stock by comparing to a stock a9l2 tune and copying from comparw and pasting back the original values.

the mbt chart on the homepage shows 28 degrees for your heads. Than means you need to globally subtract 2 degrees from the spark table.

this should all be detailed and outlined in the a9l2 write up

[olddog]

I incorrectly had Edelbrock Performer RPM heads in my profile. After checking out my engine, they are Edelbrock Performer heads. I have correct my profile.

The Performer heads have smaller ports and valves. I checked the MBT list. It only has the Performer RPM head listed. Copilot claims the Performer heads might require 1-2 more deg timing than the performer rpm heads. Unless you tell me otherwise, I will globally take 3 degrees off the base A9L2. I want to error on the safe side.

[olddog]

Oh, the top row (200%) has 0 at 750 rpm. Subracting 3 gives negative 3. In fact there are several negative number in that row. Can you enter a negative number? If not I can leave that row untouched. I will not be adding boost, so it will never get there.

[decipha]

if you got the ol edys then crank her up to 34 degrees at 80 load on up over 3k rpm

if you follow the instructions as outlined in the write up youll be fine.

[olddog]

I subtracted 2 from all values except the top (200%) row. I left them the same. I didn't know if you can put a negative number in. I want to stay on the safe side, while I dial in Fuel.

I went through the list and updated MAF transfer, Injectors, CID. That's all correct. Then I ran the difference of my bin verses the latest A9L2 bin that I started with. It seems like everything changed is listed twice, but each has different values. I don't understand that. The values are in hexidecimal. Maybe that is normal. All the parameters that I changed are in the list. However there is something that I did not change.

my A9L2
Checksum - ROM_TO / CHKSUM BE EF
Checksum - ROM_TO / CHKSUM 24 C6

Does that need to be changed back? If so How?

I'm quite new at TunerPro. I probably did something wrong.

[decipha]

No, gufx does not allow negative values in the spark table, that's one of them updates henry did in the newer strategies. On a SBF its not really an issue but on more efficient engines it becomes a big problem especially the high power i4's.

you have to double click on the item in the compare to open it up and see the values

checksum is automatically updated/corrected every time you save your tune file in tunerpro

[olddog]

My engine has no egr, no smog pump, no cats, no emissions stuff at all, except a pcv valve. It has headers going into side pipes. O2 sensors are in a single tube near the head. The collector is outside the body. A fairly long way from the heads. I have bunges in the collectors to install a wideband O2 for tuning.

I assume A9L2 adds timing based on egr. No clue about what the other stuff affects. Are there changes you recommend based on this information?

[decipha]

you cant put an o2 on a single cylinder the scavenging and pulses will make it read wrong

no, it does not.

if you follow the instructions in the a9l2 write up youll be fine

[olddog]

The single pipe bungs are 9" from head. Located in #2 and #6. The O2s were located here, when I bought the car in 2007. The internet wisdom back then was a single pipe was better than 3 feet away. I recall questioning that, when I bought the car.

12 years ago, I welded new O2 bungs into the collectors. Collector is only 4" long. O2 is as far back as it could be welded in. Head to end of collector is 35" to 37" +/-1" as best as I could measure. They are not exactly the same length, but close. I now remember that back then I had planned to move the O2s to the collectors. I remember measuring the wires. I planned to leave the O2s where they are while tuning the fuel in. I plan to not allow the Kam to update while dialing in the fuel, so the narrow band O2s will not be used. I will have a wide band O2 in the collector, while dialing in the fuel. Once I get the fuel dialed in. I will move the wide band to the other side and verify the fuel is the same bank to bank. Once bank to bank is good, I will remove the wide band O2 and move the narrow band O2s to the collectors.

Also of note the headers and side pipes are ceramic coated inside and out. They are hot enough to burn your leg bad when it's running. I am pretty sure to O2s will stay hot enough to read going down the road. I am not positive they will, if it sits and idles very long.

It seems to me someone had told me there are some parameters to adjust, to compensate for the lag time caused by the O2s being so far away.

Thoughts?

.