[Diy_efi] Re: (was: IAC counts) VE tuning issues

[Mike Frels]

Don't you mean 'injectors are much SMALLER than #24 they are supposed to be?'

Anyway as far as oxygen getting into the exhaust stream the only thing I 
have really checked is proper AIR system operation. That is working as it 
should. I have not re-checked that exhaust manifold bolts since spring when 
I put the engine in. Yes, I am still running cast iron manifolds. I will 
take a wrench to the exhaust bolts and nuts tomorrow. Thanks for that 
possible pointer.

The injectors are brand new Accel 24 pounders. No, I did not have them 
flowed before installing as I believed I could trust them from the factory. 
Is experience counter to this?

Mike

At 05:59 PM 12/31/2004, you wrote:
>I look at it this way:  BLM's greater than 128 means the ECM is having to 
>add fuel to keep the mixture right.  This means it's getting more air than 
>it should according to the VE tables, which means the table values need to 
>be raised by the appropriate factor.  [(BLM/128)*current VE] is a very 
>good formula for finding how much to adjust it.
>
>If you're getting 160 BLM's and you have 80's in the low-rpm VE table, 
>then either your injectors are much bigger than the 24# that you think 
>they are, or you have a pretty significant vacuum leak, or you're getting 
>a false lean reading from the O2.  First thing to do is check for exhaust 
>leaks before/near the O2, as that will REALLY screw with your BLMs.  Where 
>did you get the injectors?  Are they new or used, and have they been flow 
>tested?

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