Thread: Hilborn 8 Stack Electronic Fuel Injection

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Tom,
Try Karl Performance in Des Moines - Karl Performance Parts They seem to be a full line shop, serving the whole gambit from OEM to Street Rod to Racing. You might call them and chat before investing in driving over there, but it looks like a good place to start that's not too far from home.

I have a Enderly and Fast electronics on a 502 bbc. Believe me its not really made to run at near idle speeds. These are racing manifolds made to run at full throttle. I have similar problems. Your surging is cause by a lean condition. Some of these units like the Fast have a base program that you cant change, may not work for your application too many variables. Wont go into learning until it hits a certain engine temp. Manifolds don't have a plenum, so no idle air control. I have a small aluminum block with air brake hoses to each runner under the butterfly, doesn't really do a good job though. Lots of things to check to try to make it run better. Fuel pressure and a proper regulator is another. Do you have a return line to fuel tank? You have to sync all cylinders with a synchronizer and tweek each butterfly to get them flowing all the same, very time consuming. These are just some of the thing to do to try to get it running better.

KC

Tom,

First off, are you running a Cam Synch or DIS (what do you have in the distributor hole, and how is it setup in the Computer)? If not, you are not running the Injector in sequential mode, which has a history of doing exactly what you are suggesting-popping through the stacks. This means you are running it in batch fire, which will fire the Injector when it is not needed-sequential can help with that-

#2, are you running one EGT sensor or two? (the Holley can run two, which can give the Computer more resolution).

Have you adjusted the manifold and done the arc adjustment/synch?

Jerry, I know that Hilborn generally does not run a IAC (mine doesn't have one), and in discussions with Andy Starr, on a Hilborn C396 anyway, he says they do not use or need one for EFI.

Tom, If I were you I would call Andy Starr at Hilborn (he was in the California location last week, try there)-I believe next to Doug at Holley he is your best resource to fix this-

As for the idle after it warms up, obviously this is a seperate issue, as the Computer changes it's parameters when the coolant temp goes above a preset value (say, 180 degrees), so that can be adjusted, and you should be able to get it to idle correctly-

I found an outdated list of tuners in a Car Craft (?) Article (not many Holley tuners as it is the newest system out there), but again, either I would call Andy or the Tech line at Holley-they will help!

Originally Posted by KC33

I have a Enderly and Fast electronics on a 502 bbc. Believe me its not really made to run at near idle speeds. These are racing manifolds made to run at full throttle. I have similar problems. Your surging is cause by a lean condition. Some of these units like the Fast have a base program that you cant change, may not work for your application too many variables. Wont go into learning until it hits a certain engine temp. Manifolds don't have a plenum, so no idle air control. I have a small aluminum block with air brake hoses to each runner under the butterfly, doesn't really do a good job though. Lots of things to check to try to make it run better. Fuel pressure and a proper regulator is another. Do you have a return line to fuel tank? You have to sync all cylinders with a synchronizer and tweek each butterfly to get them flowing all the same, very time consuming. These are just some of the thing to do to try to get it running better.

KC

KC, thanks for posting about your system. I learned a couple of things - made me go look at the IAC loop to sort out details on them. I'm interested in your aluminum block with air brake hoses plumbed to each runner below the butterfly. Can you maybe post a picture or two, and an explanation of what you've done? Just curious, but it might also give Tom another nugget to share with whoever he gets to sort out his system.