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Discussion Starter #1
I'v seen this posted a couple times, but not for a 90 3.8 thunderbird, and I know that my bird is far different than a newer 5.0

What kind of pullies should I buy? This will be a daily driver for me (so I don't want anything to hard on the engine).

My 90 tbird is 100% stock w/ 95,000 miles.

I have also read that pulley upgrades can improve the MPG, is there any truth to this?

Thanks in advance.
 

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I have ASP and I have just the underdrive crank pulley. I guess I noticed a small gain, but anything under 10hp is hard to feel anyway. Theoretically yes, it will improve gas mileage. It takes stress off the motor by removing some of the parasitic drag from spinning the accessories. I never really documented mine, or payed attention so I couldn't tell you from experience.
-Thomas
 

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How about "overdrive" pulleys? I could use something like that for my system!
 

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Thomas said:
I have ASP and I have just the underdrive crank pulley. I guess I noticed a small gain, but anything under 10hp is hard to feel anyway. Theoretically yes, it will improve gas mileage. It takes stress off the motor by removing some of the parasitic drag from spinning the accessories. I never really documented mine, or payed attention so I couldn't tell you from experience.
-Thomas
have you ever been able to feel any mods you've put into that thing?!? :rofl: :rofl:
 

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Kodiak kid said:
have you ever been able to feel any mods you've put into that thing?!? :rofl: :rofl:
yeah? well I will take your mother out for a nice seafood dinner and NEVER call her back!
 

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Shame when people miss gold references like Thomas' above.

Personally, I'd save the money on the underdrives and start looking towards the rest of the motor: heads, a cam, intakes. Just a different route you could take.
 

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Discussion Starter #9 (Edited)
I'm thinking of going with ASP underdrives on my crank and a smaller pulley on my alternator to keep it turning the same rate so not to have battery charging problems. Is this an okay setup?

I'm looking to purchase from http://www.aspracing.com/ford.htm simply because its the only website I know of (so if you know of a better price/quality please let me know)

I see a 90 3.8 (non-sc) 25% Crank2 3/4" Alternator for $100.

Is that the only piece of hardware I need to order? I'm reading it as having both pulleys. Is 25% too much for a daily driver? I always thought that 5-15% was the norm?

Could I keep my same serp. belt with these pulleys?

Thanks for the help :)

EDIT: I just remembered, my Tension Pulley is bad, so I need a new one of those also. So if theres a quality place to buy a package deal I would be interested in that too. Ebay seems a little too fishy for me. Thanks again.
 

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I got mine off ebay for 25 bucks from a guy off of this board who built a 4.4 stroker and broke his crank, then parted out the motor :)

Look on this site, and remember your motor is the same as a 96-98 mustang, so the ones for the mustang will fit. And he also sells the belts you need, but I believe they are 96.5" long?

http://rpm-mustangs.com/cart/home.php?cat=273

-Thomas
 

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Discussion Starter #11 (Edited)
Thanks for the link :)

So I'm going to buy the:
-ASP 25% Underdrive Crank Pulley and 2-3/4" Alt pulley for 90-98 3.8 and 97-98 4.2
-Short belt for use with underdrive pulley (94-04 mustang)

Is that right?

Are either of these 2 pieces also known as a "tension pulley" ? I was told my tension pulley needs to be replaced. I'm figuring that I still need to buy one along with this package.

Also, is this a do it yourself? How long does it typically take to do? Or how much should I be expecting to spend at a shop?

Edit: Is there any water pump pulley or something I could buy to prevent overheating problems with the pulley?
 

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I'd just e-mail Mik (owner) to make sure but those should be what you want. You'll have to replace your tensioner seperately, that isnt included in the kit. The install is pretty easy if you know the tricks to brekaing the bolts loose. I'll get more in depth tomorrow, I'm headed to bed right now. Night.
-Thomas
 

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i got the mac set, 10% underdrive, well i had the set, but now i only have the crank pulley, i got them brand new off of ebay for like $60 dollars shipped, brand new....:D
 

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Tom,

Tensioner pulley isn't hard to change. Any parts store should either have one or be able to get one. Just remember the bolt holding the tensioner pulley on is threaded backward. You turn it right to loosen and left to tighten.

I've got the ASP Crank pulley and alternator pulley on. Have had not problems so far. We'll see how cooling is this summer.
 

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Anything new on the Underdrive pulley issue, is it a good deal? Thanks.

Would like to install mine, but if not worth it, willing to sell.
 

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what is this issue with the tensioner pulley? when i did mine all i did was get another shorter serpentine belt.
 

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Discussion Starter #17
Great replies so far, thanks for the help. :)

The main reason I am concerned about the water pump & heating issues is because I live in southern california, so the summers can get over 100 degress fahrenheit. I also plan to drive to Las Vegas some time (7 hour drive), which would be the longest trip I have taken in my car.

I figure my car will be okay, I haven't heard much about overheating issues, however, if there was an extra pre-caution to prevent heating I would surely like to know.

chorizon said:
what is this issue with the tensioner pulley?
It makes some weird whining noise. The mechanic gave me a listening device similar to what doctors use to listen to your heart beat, he put it on the pulley and tried to explain it to me. All I knew was that I would be out about $10 and he would be finished swapping it out about 5 minutes after I bring him the part. It's not too much of a factor to me.
 

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Tom,

I have taken that run to "lost wages" from Anaheim many times. Take water for you and the car just in case.
 

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Distilled water or a jug of 50/50 mix antifreeze (for the car). You'd put it in the overflow tank if necessary.

I've only had probs going to lost wages once. My freeze plugs had rotted out on a Dodge Aries. Just had to keep filling with h2o and watch the temp gauge.
 
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