I have been reading allot of the old threads, archived etc about split BLMs. There are fixes, some work pretty good. But I have noticed there are allot of people that agree, LTx engines have a split BLM issue, especially with bigger cams and ported heads and or manifolds.
So, I was curious if anyone has dynoed/datalogged the new LTx manioflds from Edlebrock and if they have noticed any changes in the BLMs?

 

My BLMs are within a couple points which is about as good as can be expected with injector and O2 variances.

I have to wonder if the guys with big problems either do not have aftermarket TBs setup right or the porting is sloppy causing an imbalance.

 

Dwayne, How big is your cam, and did you tune each cylinder pulsewidth etc or whatever it is 94 -97 was capable of doing? 92-93 LT's were batch fire and you had split problems. I read here that the manifold, and head porting caused more blm issues, and camshafts just attenuated it.

 

Cam is mid 220s intake, tighter than 112LSA, tune is a mailorder From Carolina Auto Masters.
It does make sense that the batch fire stuff would be harder to tune for part throttle.

Why is your cranking compression so low? My bone stock 220K mile wagon will crank that.

 

I think my cranking pressure is lower due to larger cam, which bleeds off some pressure, and low tension rings?
My lobe sep is 112+2 Comp Cams custom.
94-97 LT's had a system where you can tune each cylinder at idle, and above idle by changing the constants or something within iu neach cylinder. Gm did this to each cyloinder, as you can see on there factory tables that each cylinder was not perfect so they tuned it, as well as sequential injection from 94 up.
I do have the tables.

The 92/93 engines are batch fire, and there is no compensation(or tuning within the factory chip or tunercat ((which I use)) for tuning left or right cylinders, or individual cylinders.