underdrive pulleys
#1
Racer
Thread Starter
Join Date: Apr 2008
Location: Seattle
Posts: 315
Likes: 0
Received 0 Likes
on
0 Posts
underdrive pulleys
can someone explain to me underdrive pulleys? i read somewhere you can expect a 7-8 hp gain so I had them installed however now i'm reading that theyre not good for everyday driving?
#2
you need to reset the ECU= look in the passenger footwell for a fusebox- pull CLOCK fuse for a minute and put back in place. Now the car can learn its new powerband from the pully change
The crank pully frees up about 8 hp that the sheer weight of the stock pully keeps locked in the engine 11 pounds versus less than 2 pounds
the other pullies are just bling and of no real value on a TL
The only concern is at idle with MORE than 600 watt stereo- the alternator isnt going fast enough (with the underdrive rpm) to power the system fully
You may notice the a/c not as good at idle too- but works fine on freeway or at any speed- again slightly less rpm to the unit at idle....
The crank pully frees up about 8 hp that the sheer weight of the stock pully keeps locked in the engine 11 pounds versus less than 2 pounds
the other pullies are just bling and of no real value on a TL
The only concern is at idle with MORE than 600 watt stereo- the alternator isnt going fast enough (with the underdrive rpm) to power the system fully
You may notice the a/c not as good at idle too- but works fine on freeway or at any speed- again slightly less rpm to the unit at idle....
#4
Senior Moderator
Originally Posted by achen0122
which pulley is the one right next to the engine? the most obvious one when you pop the hood? what are accessory pulleys for?
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
rp_guy
Member Cars for Sale
9
07-16-2017 07:33 AM
mrkingstonvi
Member Cars for Sale
2
02-22-2016 01:53 PM