Underdrive pulleys for GS400/430?
10-04-05, 10:04 AM
#2
Lexus Champion
The stock pulley is already small diameter and has the HIGHLY recommended harmonic balancer/dampener built in. Larger pulleys on the PS pump and alternator are possible but hard to know the improvement. Water pump is driven off cam belt so that is not part of the equation.
10-04-05, 01:24 PM
#3
On my acura legend, a lightweight underdrive pulley made a difference in low end power. Then again, my car doesn't have a dampener (single solid piece pulley).
If I had to do the mod again, I would not get it for the crank pulley. Lighter pulley on other pulleys are fine, but not the crank. The risk you take just to gain a few more ponies is not worth it.
If I had to do the mod again, I would not get it for the crank pulley. Lighter pulley on other pulleys are fine, but not the crank. The risk you take just to gain a few more ponies is not worth it.
10-04-05, 05:35 PM
#5
Lexus Champion
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10-04-05, 05:37 PM
#6
Lead Lap
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And here is a place for purchase. Should work for 400, but not sure about on 430. all 400 series cars have the 1uz so it should work.
https://www.clublexus.com/forums/sho...d.php?t=181083
https://www.clublexus.com/forums/sho...d.php?t=181083
10-04-05, 08:49 PM
#7
Originally Posted by Lextreme
Here is an interested article on underdrive pulley from our site. Lexus Underdrive Pulley
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10-04-05, 08:57 PM
#8
Lead Lap
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Check out the link above. I am selling one of two ever made. I guess if there is enough interest from you guys to buy these i can talk to lextreme about adding it to his products. But if nobody even buys this one it deffidentally wont happen.
10-12-05, 01:22 PM
#10
Lexus Test Driver
Bad idea to make one without the damper in it.
I made some already like 5 years ago and tested it extensively on a GS400 and also an SC400, we have probably 70K miles on them, but I'm still not comfortable with saying this is a good upgrade. Crank walk or bearing damage is very very very possible, and this type of damage potential increases exponentially each time you rev the engine higher.
I definitely wouldn't put it on my race car engine or anything that sees over 7000. Instant damage there is my guess.
Good acceleration increase though and no problems with charging or a/c
I made some already like 5 years ago and tested it extensively on a GS400 and also an SC400, we have probably 70K miles on them, but I'm still not comfortable with saying this is a good upgrade. Crank walk or bearing damage is very very very possible, and this type of damage potential increases exponentially each time you rev the engine higher.
I definitely wouldn't put it on my race car engine or anything that sees over 7000. Instant damage there is my guess.
Good acceleration increase though and no problems with charging or a/c
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