Success! - 400Pontiac, MSD Distributor, 6AL

[96 Comp T/A]

Awesome!! Thanks for the clarification. I have the setup working perfectly on the bench with a test rig (drill to spin the distributor). I am going to put it on the car this week and test it out.

[busta9876]

I have a TPI motor a Pro Billit dizzy, locked out, I inverted my wires from the dizzy to the MS unit. and set then engine at TDC #1, droppped the dizzy in and the rotor bug pointed dead inline with tower for #1,

when trying to start it ..it acted retarded, so I mssed with tirgger offset, and finanly when i got to -37.00 the timing on MS matched my light.

Did I maybe think I inverted my dizzy signal or does the dizzy need to be turned to bring everything in. i dont like having a -37 offset.

[krisr]

What input edge are you capturing on? You need to be sending a neg-to-pos signal in on Pin24 which is inverted to a pos-to-neg transition, i.e. capturing on falling edge and inverted the wiring as mentioned. I set my offset to 10°BTDC and turned the distributor the rest of the way as i'm using trigger rise for cranking. I wouldn't like -37° either.

That is how I set my pro billet setup and it's working like a champ!

[busta9876]

my software settings are exactly as yours, I printed this post.

Input: falling edge
spark out: going high
cranking trigger: trigger rise

i'm going to recheck my wiring tomorrow night, (spent too much time on this today)

a side note on the STOCK MSD wiring

Dizzy: striped orange to MSD Harness: Purple
Dizzy: striped purple to MSD Harness:Green

[krisr]

Hang on.. You just lost me there... Are you feeing your tach signal (pin 24 on MS2) from the distributor or the tachoutput from a 6AL unit?

I snipped off the plug on the probillet distributor and feed the purple stripe wire straight from the distributor direct to MS2 using the VR input circuit. ( Just checking we're on the same page )

[busta9876]

My table is a combination of MSTweak plus manual tuning. Autotune didn't exist yet. If you can get MSTweak to work with MS-II, I highly recommend it. My setup started with MS-I and a NBO2 and that's what I did my logging/MSTweaking with. Shortly after that, I got my MS-II and a WBO2. I imported my MS-I table and then did some manual tuning to further lean out the cruise range.!

I was able to edit my MS-II data log and change the first two rows to match that of a data log from MSI, i opend MSTweak and it worked,

you just hvae to do a VE export from MS-II, then go to MSTweak and open the datalog that is modified, go to modify ve table in MSTweak, open LD map, then do the filter and caculate, export to vex file, go back to megatune and import ve table...worked like a charm.

good luck

[busta9876]

Okay, I tried the settings for MSD 6A as shown on the megasquirt.info website.

these are my settings:

Ignition Captre: Rising Edge
Cranking Trigger: Trigger Rise
Coil Charge: standard
Spark Output: Normal (going low)

Trigger Offset: 0.00

I reversed my wires , I know have Purple Striped wire on distribtor going to MS-II ground. Orange striped wire goes in on VR IN.

I aligned the dizzy rotor bug with tower #1, ballancer at 0 degrees, set timing in table to 15 all over, started right up, timing rock solid at 15 degrees.

Before it was jumping around alot.

now this goes opposit what was found on the 400 Pontiac.

The Distributor does not turn different direction does it? could this be why we had different problems? My Pro Billet is also 5 year old. Maybe somthing change, who knows, all I know is I'm up and running , timing working great.

[krisr]

Ahh yes. They do spin in a different direction. I thought when you said you have the same setup, you had a Pontiac engine too.. Didn't read the TPI bit..

What predictor algorithm are you running? I have noticed my timing jumped around a bit on 1st High 2nd Low, so I changed it to last interval and it seemed to be pretty solid now.

[busta9876]

Ahh yes. They do spin in a different direction. I thought when you said you have the same setup, you had a Pontiac engine too.. Didn't read the TPI bit..

What predictor algorithm are you running? I have noticed my timing jumped around a bit on 1st High 2nd Low, so I changed it to last interval and it seemed to be pretty solid now.

I've been using 1st high 2nd low, I am getting ready to go outside and try last interval.

after fixing the first bit timing was a lot more solid, but still maybe jumping around 2 or 3 degrees...i figured it was slop in the timing chain slop or somthing... i'll let you know.

[busta9876]

Last interval has help a lot! I've been out driving for about 3 hours tonight using autotune and a little MSTweak. I just need to enrich the high load areas a bit and lean out the cruise parts and I'm done. I sitll need to tweak the timing a little but the engine seems to be running pretty good now.