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underdrive pulleys

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Old May 18, 2009 | 11:16 PM
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From: flordia
underdrive pulleys

i was talkin to some folks today about underdrive pulleys on chebys and was wonderin if they would benifit a 302
 
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Old May 19, 2009 | 12:17 AM
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I put an overdrive pulley on the 3G alternator on my Lincoln's 302, so the alt can keep up with the stupid amount of light power I have in that car. Why overdrive, and not underdrive? Cause of the use the engine was seeing, lots of idling and low-revv. With yout 302, how high do you go as far as engine speed, and how often you do it? Everyday off-the-light races where you shift at 6k would probably justify the underdrive setup install, but if you mostly drive your truck as a daily driver they you may actually hurt your cooling and charging systems by slowing down the water pump and the alt... It's your decision man, you know best what you do with that truck.
 
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Old May 19, 2009 | 05:53 AM
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I have used underdrive pullyes on 2 mustangs & on my truck for a year now & have had no problems . It will free up a few HP . Lew
 
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Old May 19, 2009 | 07:28 AM
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From: flordia
i do very little driving in town maybe one trip out a week but other then that all highway other then that just 2 miles through tha woods to my work truck
but tryin to free up a few hp
do ya really think it may hurt tha cooloing and charging
 
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Old May 19, 2009 | 09:32 AM
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as far as coolin goes u could install a electirc fan, that should free up a lilttle hp by itself
 
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Old May 19, 2009 | 09:34 AM
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also this will help with ur torqe Trick Flow® EFI Heat Spacer Kits: TFS-51520008 - trickflow.com lowerd my buddys 1/4 by a full sec so i know it does do something
 
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Old May 19, 2009 | 09:45 AM
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From: flordia
thanks for tha input i already have tha electric fan
i orderd tha underdrive pulleys today im gonna see how they do
that heat spacer does it effect tha computer at all if not i think i might give it a try
 
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Old May 19, 2009 | 09:46 AM
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From: Longview Tx
I have used them on 3 mustangs and 2 trucks never had a problem and they will free up some HP. They freed up 20hp and 54tq on my 96 f250
 
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Old May 19, 2009 | 09:57 AM
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From: Longview Tx
I have used them on 3 mustangs and 2 trucks never had a problem and they will free up some HP. They freed up 20hp and 54tq on my 96 f250
 
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Old May 20, 2009 | 12:28 AM
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Originally Posted by redneck4242002
i do very little driving in town maybe one trip out a week but other then that all highway other then that just 2 miles through tha woods to my work truck
but tryin to free up a few hp
do ya really think it may hurt tha cooloing and charging
Nope, you should be fine, the underdrives hurt you most when you are creeping through traffic, or a similar low-speed high-heat situation. For what you do with your truck, go ahead and install the underdrives, they will indeed free up some power - whether you will feel that or not is a different thing, but they will free up power nevertheless.
 
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Old May 20, 2009 | 09:01 AM
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From: flordia
i should have my underdrive pulleys today
thanks for all tha input
if yall dont mind me askin has anybody used these on their truck and how do they work or could they hurt her Trick Flow® EFI Heat Spacer Kits: TFS-51520008 - trickflow.com
 
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Old May 21, 2009 | 01:50 PM
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i belive that the spacer creates more trouqe by giving making the intake runners longer and also provides a little more cooling for the air. it would affect ur computer any way at all. have u seen this thread https://www.ford-trucks.com/forums/7...n-install.html the i would change is the big *** relay he used, i just used the one that came in my 40 controller kit from auto parts store works fine
 
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Old May 21, 2009 | 01:53 PM
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i belive that the spacer just creates more troqe by makin the intake runners longer and provides a little more cooling. doesnt affect ur computer any way at all. have u cheacked this thread out https://www.ford-trucks.com/forums/7...n-install.html the inly thing i did diff was i didnt use that big *** relay he used just the 30 amp that came with my fan controller kit for 40 bucks from az
 
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Old May 21, 2009 | 02:51 PM
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From: flordia
thanks for tha info
no i went a whole differnt route with tha fan
bought electric fan from lmctruck, made shroud out of sheet of aluminium, ran wire ing through sepert thermostat from lmctruck installed on inner fender well then ran to fuse block
 
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Old May 21, 2009 | 06:10 PM
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Originally Posted by Beamed
i belive that the spacer creates more trouqe by giving making the intake runners longer and also provides a little more cooling for the air. it would affect ur computer any way at all.
That is correct - the intake spacer increases the runners length, which ends up beneficial for the low-end torque. It also insulates heat from being easily transferred from the hot lower intake manifold to the relatively cool upper manifold, which reduces heat transfer from the manifolds to the air rushing through them. The cooled air will be registered properly by the air-charge temp sensor, and the PCM will adjust the fuel delivery accordingly, so all will be good in the end. I run a spacer like that in my 302 Lincoln, I installed it at the same time I upgraded the upper manifold and the throttle body and also bumped up the base timing so while I'm sure it works like it should, I can't tell you how noticeable the improvement will be with that spacer you're looking at.
 
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