MAF Drop-out, Timing Drop-out

[bruce]

Yep,
you can have MAF drop out,
and Timing Drop Out.
At over 6,375 the timing starts to do about the same thing as the MAF, ie erratic, (low) numbers.

 

[bruce]

Originally posted by bruce
Yep,
you can have MAF drop out,
and Timing Drop Out.
At over 6,375 the timing starts to do about the same thing as the MAF, ie erratic, (low) numbers.

Sorry for the flyer,

anyway that'a 6,375, as in RPM.

 

[motorhead]

Why were you over 6300rpm?

 

[Eric Stage I]

Because Bruce has a Stage II ecm bench

Eric

 

[Chuck Leeper]

6300??

Because he CAN!!

 

[TurboDave]

6375 doesn't surprise me at all. It seems to be the limiting factor on the stock PCM's, in several places.

The most glaring of which is the rev limiter. Since FFh is the largest acceptable byte size in our PCM's that's the highest rpm you'll be able to supply fuel to. Since FFh in the rev limiter = 6375rpm, then there's probably other limitations based on that rpm elsewhere.

 

[bruce]

Originally posted by TurboDave
6375 doesn't surprise me at all. It seems to be the limiting factor on the stock PCM's, in several places.

The most glaring of which is the rev limiter. Since FFh is the largest acceptable byte size in our PCM's that's the highest rpm you'll be able to supply fuel to. Since FFh in the rev limiter = 6375rpm, then there's probably other limitations based on that rpm elsewhere.

I hate it when you do that, LOL.

Yep, but in some areas FFh, just sets things to ignore.
Some stuff you just gotta run on the bench to see, what does happen, and then be looking in 3 directions so as to not miss something.

 

[S2V6RACER]

Steve Wood?

 

[John at J&S]

Bruce's bench

Bruce:

Let's see your bench. Pics, pics, please.

 

[Steve Wood]

Originally posted by Ted A.
Steve Wood?

That is the limit in the factory set up as pointed out.

 

[bruce]

http://www.diy-efi.org/gmecm/projects/ecm_testbench/ecm_tbench1.jpg

This is a real old pic., of one of the first ones. It was set up to run 2 ecms at a time for doing comparisons.

If someone tells me how to attach a pic., I have some current pics..

 

[John at J&S]

Good work, Bruce. Don't you just love the smell of solder in the morning?

 

[bruce]

Originally posted by John at J&S
Good work, Bruce. Don't you just love the smell of solder in the morning?

Naaaaa,
more of a M+H, Goodyear, Bridgestone, tire smoke smell in the morning guy.
Or LOTS of Naplam.......

The NEW bench is really slick. I have a laptop running DS, on onw side, and another with Pocket Programmer on the other, then when using the romless stuff I can use EEPROMS, and no waiting for an erase cycle. Can do enough chips fast enough to really confuse myself.......

 

[gnjones231]

This is not right. Bruce did not correlate anything again. In the words of Gomer Pyle "shame, shame, shame'. I've been through this before in this thread.

http://www.turbobuick.com/forums/showthread.php?threadid=46755&referrerid=746

The ECM will control timing to at least 8000 rpm. No drop-outs of timing. No drop-outs of maf either. As Far as fuel drop-outs, So far you have two choices....The stock chip will cut fuel cleanly above the limit in the chip. A Thrasher chip will do a drop out at 6000 rpm like a stutter. Maf drop-out has nothing to do with rpm above 6375 rpm.

Dave

 

[bruce]

Originally posted by gnjones231
This is not right. Bruce did not correlate anything again. In the words of Gomer Pyle "shame, shame, shame'. I've been through this before in this thread.

http://www.turbobuick.com/forums/showthread.php?threadid=46755&referrerid=746

The ECM will control timing to at least 8000 rpm. No drop-outs of timing. No drop-outs of maf either. As Far as fuel drop-outs, So far you have two choices....The stock chip will cut fuel cleanly above the limit in the chip. A Thrasher chip will do a drop out at 6000 rpm like a stutter. Maf drop-out has nothing to do with rpm above 6375 rpm.

Dave

Swing by, I'll show you where the error in the MAF stuff is.
Or set up even some LEDs for the injectors, and bring the MAF input up to over 150 Hz.

Shame shame shame your own self.
And you reading stuff into the post that just aint there, no where did I say the MAF drop out was rpm related
shame shame shame for not even reading the post.

If you watch the rom location that the timing is stored out you'll see the timing error. So again, thanks for playing,
Have a Nice Day.

 

[gnjones231]

At over 6,375 the timing starts to do about the same thing as the MAF, ie erratic, (low) numbers.

Well, excuse me for reading what you wrote. Maybe you should rephrase this quote.

 

[John at J&S]

tsk tsk

POPCORN, get your POPCORN!

 

[bruce]

Originally posted by gnjones231


Well, excuse me for reading what you wrote. Maybe you should rephrase this quote.

At over 6,375 the timing starts to do about the same thing as the MAF, ie erratic, (low) numbers.

So far your the only one not to get it, so
Just for you,

At over an indicated rpm of 6.375 the timing starts to randomly drop the timing stored in ROM, just like the MAF does when subjected to input values of over 150 Hz..

Of course none of it means a thing, since the injector cut off values stop at 6,375 anyway.

 

[gnjones231]

Uh no, the timing does not drop randomly unless you have some special kind of chip. Please post your correlation. All you're looking at is DS. If DS is reporting this, then it is wrong! You need to look at the EST line, and you'll see that it is not dropping out. I have posted which chips I have tested and my correaltion in regards to timing. Please do the same.

I get it now, sorry, I did misunderstand what you said. My bad


Dave