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-   Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 (http://www.ramforumz.com/forumdisplay.php?f=83)
-   -   Question for "CAM" change. (http://www.ramforumz.com/showthread.php?t=50014)

TOPPERST 03-23-2010 08:36 AM

Question for "CAM" change.
 
Hi I am new to this forum. I am planning on changing the cam in a 2004 5.7 Ram. May go with the Comp Cam EX 268. Can anyone tell me if the computer can be reprogramed properly with a downloader such as a Predator or a Bully Dog. Or should I take it to a dyno shop? From what I been told, the new cam will cause a decrease in vacume pressure. Thanks for any help!

RamTech 03-23-2010 09:35 AM

I'm sure the cam will change the vacuum which will be seen by the PCM and alter the fuel delivery. What does Comp have to say about reprogramming for this particular cam grind?

TOPPERST 03-23-2010 10:20 AM

I called Comp Cam tech support and was on hold for a 1/2 hour. When I got to talk to a tech, he did not give me any good answers.

RamTech 03-23-2010 10:29 AM

The big question is how much of a change from the factory cam will this one be? if the difference is mild, you may not need any serious changes to your PCM's programming. What are the specs on this cam?

TOPPERST 03-23-2010 11:41 AM

Hi, thanks for your reply. I just went to a local speed shop that dose dyno. They said dont change the cam, the factory cam was well desinged. Other mods would be better. I guess that will save me $600.00, Thanks again!

MotorCityRam 03-23-2010 10:24 PM

Quote:

Originally Posted by TOPPERST (Post 178939)
Hi, thanks for your reply. I just went to a local speed shop that dose dyno. They said dont change the cam, the factory cam was well desinged. Other mods would be better. I guess that will save me $600.00, Thanks again!

Bad answer IMO. Find another shop. The tough thing is these are speed density systems. Cam swap is pretty much going to guarantee you're going to need some tuning (at least anything that makes a worthwhile gain). There's some big hp to unlock in these motors w/ a decent sized cam but you're going to HAVE to tune for it.

That or gut the EFI and drop a carb on the thing and tune it in the garage. ;)


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