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6G Celicas Forums > 6th Generation Celica > Engine/Transmission/Maintenance
TRDDawg
Are there any underdrive pulleys available? I have heard that you can put an ASP underdrive pulley for a Corolla with a 7aFe engine on a ST Celica for 8hp gain. Will it fit on a celica? Are these hard to install if anyone has one of these?
HyperDeathKill
www.unorthodoxracing.com

I just ordered mine, and it should come in anyday now.
HyperDeathKill
I'm going to do a write up when I install it, which should be sometime this week. I'll post it on my personal webpage, and hopefully Coomer will admit it into the instillation section.
BlackSTX
OBX Racing Sports also has one listed on their website. I just listed it on the parts page today. They also have a power pulley set on the same site for your power steering and alternator as well as a 7afe header.
XSTeknique
Just an option/suggestion or whatever, from prior feedback the underdrive pulleys seem to work alright but due to the harmonic balancers in Toyota engines, I'm not sure if you want this to be something you're using long term. But hey...my knowledge of cars is limited so I apologize if I am wrong. Later.
TRDDawg
QUOTE (HyperDeathKill @ Jun 3, 2003 - 8:34 AM)
I'm going to do a write up when I install it, which should be sometime this week. I'll post it on my personal webpage, and hopefully Coomer will admit it into the instillation section.

kewl I want to see how to install 1.
HyperDeathKill
Yea, I have heard both sides of the "harmonic balancer" debate. I know for a fact that newer Nissans do not have them. I will find out for our cars once and for all when I get my pulley in. Which unfortunately has been backordered.
TRDDawg
I e-mailed a guy from asp and they said that the pulley for the corolla with the 7afe engine is different from what a celica would have (7afe).
BlackSTX
If you go to ASP's site, they say something about having a harmonic balancer on their pulleys. I don't know if it applies to the 7afe, though.
HyperDeathKill
I installed my underdrive pulley yesterday. It is such a b!tch of a mod to install. I'm going to do a write up though soon, and send it in. But for now let me tell you that the stock pulley is one peice, solid metal. There is no rubber that absorbs shocks anywhere. There are 4 little holes to offset the key socket, just to balance the pulley. But it DOES NOT ACT AS A HARMONIC BALANCER.
kuruptedsnake
did u recieve any noticible horsepower from the pulleys i know on the site it says 10 to 15 but i dont know if thats true
TRDDawg
Ok whats a harmonic balancer?
HyperDeathKill
Ha, I seriously doubt 10-15 horse. Maybe 7 max... corrected. Maybe. It's worth it I'd say. I definitly did feel it, and so did my honda buddy. It says it takes a while for your ECU to adjust, so it might get me 10 in a few days. I'm skeptical about that, don't expect super gains from this.

In old cars the accessories pulley (the one I replaced, and you would be replacing) came in two parts. In between was a rubber ring that absorbed the harmonic shocks from the engine pistons moving. It was long rumored that such a thing existed in cars today, and replacing it would destroy your engine in the long run. I have never heard of anyone having an underdrive pulley destroy their engine, and I can say and prove that the pulley for the 5sfe in the ST204 is one peice solid metal. I suspect the same for the 7afe.
Blackcelliman
I tried to install mine the other day. I loaned a pulley puller from Autozone, but I never got far enough to use it. I had a hell of a time getting the belts off. I got the belt off of the alternator pulley, but the AC compressor just would not budge. It was sooooo frustrating. After quite awhile, I just gave up and put it all back together the way it was. If anyone knows how to get that 2nd belt off, can you please let me know? Thanks
HyperDeathKill
Yes, look in your manual (if you don't have one buy the Chiltons, don't buy anything else it's a waste of money), and look where to loosen the power steering. There's a bolt on the right side of the car, and one you have to losen through the hood. You see, it's on a pivot so you can slide it down, and get the belt off easy. Although, losening the bolts is horrible. It takes a good lube, and lots of patience. I had the same problem you did, this is the only way to do it.

Don't bother loaning a pulley puller from Autozone again, the accessories pulley will come off rather easy.
Blackcelliman
Thanks alot. I did give that bolt a try, but it didn't budge. I also didn't work on that bolt for a long time and that's probably the only bolt that I put a minimal amount of effort into. Hopefully, it will be easier next time. And about loaning the puller from Autozone, all I had to do is pay for it and return it when I'm done. They give me 90 days to return it and I get all my money back.
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