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under pullie good or bad?

2K views 23 replies 12 participants last post by  jjsg09 
#1 ·
#4 ·
they do help a little bit (5-8hp perhaps), maybe a SLIGHTLY bit better MPG. The issue is they underspin everything so the alternator may not fully charge at idle~ most dont have a huge issue unless they idle the car a lot or have a stereo system.
 
#6 ·
I have bbk UDPs on my car and have never had any issues. Note that I also have 2 kicker 900w amps powering 2 kicker c12 competition subs.
 
#8 ·
As was said earlier it's really only 8-10HP maybe more with a tune. but it's not really adding HP so much as simply freeing up HP.
 
#9 ·
Arron's racecar said:
As was said earlier it's really only 8-10HP maybe more with a tune. but it's not really adding HP so much as simply freeing up HP.
+1, although I believe its more around 5-8 hp freed....but none the less, get some but only get SFI certified bolt on pullies, DO NOT GET the piggy back style...
 
#11 ·
DaBluedude said:
Ill play devils advocate. I don't like them. Its a very slight advantage for a significant risk to your belt system. I prefer to keep the stock pulleys.
I just don't see Steeda releasing a product with their name on it if it was a significant risk to your motor...
 
#12 ·
I don't see any real benefit from them. I have a buddy who bought his car with them on and he's blown 1 alternator and 3 alternator wiring harnesses because of them
 
#13 ·
JDF said:
I don't see any real benefit from them. I have a buddy who bought his car with them on and he's blown 1 alternator and 3 alternator wiring harnesses because of them
Can you prove it was the UDP? And not faulty equip or overload from a system drawing too much? Many many more people have had them with absolutely no issues...
 
#15 ·
2002VertGT said:
Can you prove it was the UDP? And not faulty equip or overload from a system drawing too much? Many many more people have had them with absolutely no issues...
His car is bone stock other than gears, the UDPs, and a short throw. It ran like a top up until that point, I can't give you a 100% positive answer but I'm 98% certain those are it. He's got a 95 GT by the way
 
#16 ·
JDF said:
His car is bone stock other than gears, the UDPs, and a short throw. It ran like a top up until that point, I can't give you a 100% positive answer but I'm 98% certain those are it. He's got a 95 GT by the way
That's wierd, I mean different cars take to mods differently....I will be using stock alt pulley...and eventually getting a high amp alt...
 
#17 ·
2002VertGT said:
That's wierd, I mean different cars take to mods differently....I will be using stock alt pulley...and eventually getting a high amp alt...
Yeah it's been a real stumper for us. Gonna try and switch everything out here in the next couple of weeks. I could watch his headlights dim at idle because his alternator just wasn't able to put out enough voltage at idle.
 
#18 ·
JDF said:
Yeah it's been a real stumper for us. Gonna try and switch everything out here in the next couple of weeks. I could watch his headlights dim at idle because his alternator just wasn't able to put out enough voltage at idle.
Did he use the ud alt pulley or the stock?
 
#24 ·
I have the Steeda UD and I noticed a bit more I the throttle. I do have a tune so that may make the difference. I did have the stock pulley on the alt and my battery died within a months time. Charged the battery and it did it again. Swapped the steeda alt pulley on and didn't have a problem since.
 
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