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Old 10-23-2007, 06:57 PM   #1
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Default dropping a pulley size

Alright so I have a 3.4 MPS sitting in the box in the backseat of my car waiting to be installed. It was my understanding from other posts that I am safe to go to a 3.4 if I didnt have anything but minimal KR. So i went over to the MN GP club forum to see if anyone in the Fargo/Moorhead Area had a puller, and was told that I need exhaust work before dropping a pulley size. Do these guys know what they are talking about?
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Old 10-23-2007, 07:55 PM   #2
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Most don't realize us H/C body owners don't have a u-bend in our exhaust from the factory like the GP'* do. You probably won't need exhaust work, but it wouldn't hurt to get one of the guys in Fargo to scan your car once the pulley is installed. I don't have a scanner so I won't be able to scan before/after we do the pulley. For exhaust you could do a front ported exhaust manifold (should be able to get one of these for under $50 -I can get one ported and ceramic coated for $70, but I am out of cores and don't have time to stop into a salvage yard and get any), and a 3" DP (available from Alex Exhaust for like $65 installed IIRC).
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Old 10-23-2007, 07:59 PM   #3
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I have an aeroforce installed already, so I can scan it myself, If i do put the 3.4 and get too much KR, I could always just do some exhaust work after, as long as i just take it easy on the car, it wouldnt be hurting it would it?
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Old 10-23-2007, 08:50 PM   #4
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well scan the car with the stock oulley in a wide variety of conditions

see now that its getting colder, the car may not have KR but as it warms up you might see more

and the stock exhaust, from the car back is capable of taking you in the the mid 13'*
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Old 10-24-2007, 03:09 PM   #5
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Quote:
Originally Posted by viper8907
I have an aeroforce installed already, so I can scan it myself, If i do put the 3.4 and get too much KR, I could always just do some exhaust work after, as long as i just take it easy on the car, it wouldnt be hurting it would it?
Take it easy on the car? That takes too much willpower.

Just throw a 3.5 on there until headers and you should be good, but if you have no KR with 3.4 then you're golden.
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Old 10-24-2007, 03:22 PM   #6
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Haha well if i knew that I was going to hurt my engine, I could do it for a while, I dont drive it that much right now anyway.

I would go with a 3.5, but i already have a 3.4, I think I am going to get a 3" downpipe when i put the 3.4 on, or maybe even get pems instead of a DP..that should help i would think..
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Old 10-24-2007, 04:45 PM   #7
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Get the PEM'* before the DP. A 3" downpipe isn't doing you much good if you have restrictive manifolds in front of it.
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Old 10-26-2007, 06:27 AM   #8
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Just my .02...I've been in and out of Ed Morads shop doing all the preperation mods to completely eliminate KR BEFORE I buy a pulley...I can get a pulley now but this was a recommendation straight from his mouth...he said minimal get PEMs, 3" downpipe, 1 range colder plugs, 180* t-stat, and a fwi/cai....just throwin this out there cuz if you dont know Ed he'* very well known for his knowledge in these cars! So just becareful in what you do
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