You bring up a great poin Larry, im not sure. It should be, but its not, thats why Im stumped

 

 

Guess who immigrant! My crackhead *** is still awake. You know how long it's been since I have been on the board, brings back memories... and scents... of burning rubber. That's how long its been since I drove the T/A.

Anyway. The BLMs only split at idle? Not while cruising? The way I see it, in that case, you can narrow it down to a few variables. It has to somehow relate to the handful of sensors that contribute to fuel calculation that read from both sides of the engine... ie things like o2 sensors, exhaust leaks, the IAC passage thing. Either that or you need to compensate with tuning somehow. Basically whats already been said...

Call me up this week I'm going to be in the bay for thanksgiving. I get back on Wednesday.

 

PE Idle.

 

It seems "split BLM's" are a big deal. Someone please explain why. The only reason I can think of is that the PCM uses that info to modify the PE tables.

I bet split BLM's at low throttle have little to do with it. Plus, LT1 Edit can lock the BLM at 128 for PE tuning.

Personally, I think "split BLM's" are the airfoil of PCM tuning.

 

The intake is desgined to work equally at around 35-45 map, you get a bigger cam, that throws this range out of WAK.

Second, with high Map (low vacume), you distort the airflow in the intake, this WILL distort airflow, and when that happens, sorry to say but it will not equalize on both sides, air start turbulating, one side and even one port will get a lot more air then the other etc. So to answer your question, no overlap will not cause both sides to go, it will flip back and forth depending on the idle RPM, how the air is diverted (throttle screw), and what the temperature of the intake is, you may notice the split is one way and then swaps as the car warms up.

You will need to:

Find a sweet spot rpm, in combination with the operating temperature of the car, and even fueling. Since you have overlap, you may find that fuel sometimes comes back from one cylinder and lands in another, while it will never go the other way around, this will depending on the cylinder pressure/amount of fuel used. What does that mean to you as a tuner? Try either adding/ or removing fuel at idle. You will notice that as you lean the fuel system out, you will actually start to bring the two sides closer together because with huge overlap, this event is very sensitive to cylinder pressure/amount fuel added.

And ofcoarse, always check for exhaust leaks first/o2's

 

Listen to Bunker... he has more cam in less cubes than you do.

Bret

 

Hey bunker how is your LE3 working? Was it hard to tune? Any tips, I have a cam very similar.
-brandon

 

Can you explain your symptoms that you are trying to fix? Because my car is having problems running and it seems that you are having the same problem I am.

Except I know I have an exhaust leak and as far as I can tell, the O2s are fine (Giving good readings).