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mustanginky

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Discussion starter · #1 ·
swapping from a 3.7 to a 3.4, what belt is needed? single bolt tensioner on a 2000 gt
 
108" is what the procharger rep told me would work. That's what most people run with that size. As long as your tensioner is fine you should have no problems.
 
Discussion starter · #3 ·
my tensioner is good. wonder what size belt they recommend for a 3.70" pulley? my belt is still in really good shape.
 
I will second what Blown said. The rep said something along the same lines, and said even the belt procharger sends with the kit would have worked on my application.

You will know if you have problems, so I guess you might as well try since your belt is new.
 
they recommend the same belt but mine stretched and caused belt slip I went to 107.5 with my 3.4 after a couple months and dealing with that. No problems since!
 
Discussion starter · #11 ·
only 9 lbs? at what rpm? hmmm, i was hoping for more along the lines of 11-12 lbs.
 
Discussion starter · #13 ·
ok, i've got blower cams, won't lower boost but it will keep boost up. i made 412 rwhp and 450 rwtq on 8 lbs. hoping for at least 475 rwhp but that's boost dependant.
 
All cars are different upon how much boost they get. I was safe tuned there and made 353/347.
 
Discussion starter · #15 ·
huh? with a given pulley you will obtain given boost. unless you just don't hit a certain rpm.
 
If I remember correctly Mustang Girl has a 2-core intercooler. I'm running a 3.7" pulley and get 9 psi @ 6000 rpm through a 3-core intercooler. There is approximately 2 lbs of additional boost drop across the 2-core. ProCharger told me that you will get approximately 1 additional psi for every 1/10" smaller pulley. If you have a 3-core intercooler then you should get 11 psi with a 3.4" pulley.

I run a 108" belt but its tight putting on until it stretches.
 
Discussion starter · #18 ·
i also have the 2 core intercooler, or at least i believe i do. it is the rounded edge one that's non-polished if that is a way to differentiate.
 
Does it look like its this size. I have the 3 core. The 2 is a lot smaller.
 

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