The cooler air in the evenings has motivated me to force more of it into the little 5.3 After the 3 psi I lost when I installed my cam, I've ordered a 3.1 pulley from Nelson today. It ran so well at 9 psi earlier. Hope it will again. Gonna drop down the belt size this time also.

Am I to optimistic in thinking 3psi should net me a couple tenths reduction in ET?

 

I would think it would be worth that or a little more.

Jody

 

How did you lose 3psi through the cam? Too much overlap or are you thinking you "lost" 3 psi by going to a good blower cam?

 

205/212 .547/.538 114: taken from his sig.

Not really a whole lot of overlap there, so....?

 

With a 3.25 pulley before the cam I would see up to 9 psi boost at shift points. I now see 6psi. Where it went and what specifically with the cam caused it, I don't know. My ET's dropped from 14.3's to 13.6's with the new cam and TM removed even at 6psi.

 

That's interesting, considering there is negative overlap with that cam (-16* or -27* or something like that). OTOH, that's a great reduction in ET's. Who did your post-cam install tuning?

 

Really no tuning that was cam specific. From the Magnacharger/SuperChips tune all that I've changed to this point is getting LTFT's in line and bumped up WOT timing from 17 to 20 degrees. Lots of transmission tuning done.

 

When were the headers and catback added?

 

Well before the cam. They were there with the 14.3 runs.

 

I see that your cam has 4* advance ground in it, I assume you installed it straight up though right?

What springs are you running? Is there any belt dust on the pulleys? Have you hooked up a different boost/vac gauge at all to see if its your guage? 3psi is sure a big diff. from a cam like that.