Boost the Boost
08-22-2005, 06:25 PM
#1
Boost the Boost
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?
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?
Last edited by KySilverado; 08-23-2005 at 12:16 PM.
08-22-2005, 07:43 PM
#2
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Originally Posted by KySilverado
The cooler air in the evenings has motivated me to force more of it into the little 5.3 I'm after the 3 psi I lost when I installed my cam, 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'm after the 3 psi I lost when I installed my cam, 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
08-23-2005, 11:03 AM
#5
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.
08-23-2005, 11:09 AM
#6
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Originally Posted by KySilverado
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.
08-23-2005, 12:02 PM
#7
Originally Posted by Naked AV
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?
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08-23-2005, 01:55 PM
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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.
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.