With the injectors firing every 2nd DRP (TBI mode) the Pulse width of the now 8 injectors (especially if you upgraded to the 29#/hr units) becomes very low. This is a result of the PCM commanding an...

There are many with a very good working knowledge of the '7427 , Ken was/is one of them . He helped me tremendously. I believe he and I were one of the first to try the PFI mode in the '7427 to work...

The sense resistors (and the modification of them by bypassing them) in and of themselves do not change the firing strategy of the injectors , this is accomplished by the Memcal modification. The...

Rolly ,

You do not need to do the mod if your truck is running good as is , I did mine as more of an experiment as to see if I could get it "better" .

Dave is correct , it really isn't a...

By true MPFI I mean sequential , the '7427 will not support this . The normal "TBI" mode is injectors fire every 2nd DRP , the PFI mode I run the '7427 in is every 4th DRP (The '7427 can also run CPI...

The calibration from Edelbrock runs the 8 MPFI injectors in a batch fire mode , this setup is not a "true" MPFI setup but rather a small upgrade to get the fuel flow from the factory TBI out of the...

How is the idle quality with your setup ? I wasn't able to stabilize the idle and have it be respectable with my 502 setup until I went to PFI mode with the '7427. You didn't mention camshaft so that...