Some companies claim their pulleys can increase 7-10 HP. It sounds like just as much as a Y-pipe. Is this a BS. What do you think?

 

 

From what I can gather, yes it does give a 7-10 hp increase. The y-pipe is more like 16-20hp to the wheels. I dunno if the 7-10 hp is at the crank or if it is to the wheels. I would guess to the wheels, considering I had a 91 240sx w/ pulleys and it yielded around 5-6hp to the wheels (it also had some mods though..). Hope that helps!

 

you got 16-20hp to the wheels with your y-pipe?

 

You usually don't get any gains like that. Having a lightened pulley helps rev through the gears faster which puts you in your powerband quicker thus increasing your acceleration.
Whether or not dyno's prove 7-10 hp this is just what is normal.
The only cars the get significant hp gains are like accords and stuff but the only reason being is that they have the complete pulley system changed, because of their pulleys are very heavy. Maximas only have a need for one or maybe 2.

 

does it also offers a smoother gear shifts?

 

The Y pipe is 16-20 hp to the crank and a MAXIMUM of 12 hp to the wheels.

 

Actually it has nothing to do with pulley weight...what Under Drive Pulleys are really doing is altering the ratios between the drive and driven components...i.e. at idle your alternator will only spin 2200 RPM instead of spinning 3200RPM, and your water pump will be pumping less through the RPM band. This is due to a smaller diameter main pulley, and in some cases, larger accessory pulleys. I havn't been in a Maxima with UDP's, but I have been in a late model accord before and after a pulley conversion and I didn't notice any difference at all.

Spence

 

UDP pulleys r also lightened.....

I don't have one, but The RVM pulley I 've installed doesn't make any difference one could feel.....

 

Umm.... oh yeah, that's at the crank! Geez, I tried to help the guy, and &*$%ed up!....ok i was wrong my bad. 16-20 hp to the crank, not the wheels.

[QUOTE]Originally posted by joew
[B]you got 16-20hp to the wheels with your y-pipe?

 

From what i heard the motor revs slightly faster , most people say they can fell a differance but i dont have a aftermarket pulley so im not sure.

 

does it also offers a smoother gear shifts on a/t 4 gen max?

 

would you like to make a bet?

 

So I was right? 16-20hp to the wheels!?

 

I thought it was to the wheels too.

I'm so

 

http://www.motorvate.ca/auto/maxima/...-pipe_dyno.htm

 

Any dynos on the pulleys?

 

Sorry but 80% of hp gain is from lighter weight pulley go on unorthodox site.

 

Rotational inertia plays such a small role...If unorthodox is claiming that 80% of their gains is due to weight reduction in the unit than I would most certainly question whether the piece is good at all. That is complete bull**** that is designed to doup all of the highschool ricers. The increase in power isn't really an increase in power at all...it is a reclaiming of power taken by the accessories run off the engine. Read up on other UDP's from other companies and you will understand.

Spence

 

All in all the feeling isn't more HP it is that revving faster through the RPM's thus getting to your power band faster which in essence help's accelerate faster.

 

Quote from turbo mag march 03 p 46 " Although the unorthodox units are underdriven when compared to the stock pulleys, the company claims 85% of the power gain is due to the lighter weight." The g20 with 4 pulleys gained 3.7 hp peak and 3.5 lb-ft peak at the wheels. And if pulley weight did not matter than other pulleys would be a waste of time , because they are made the same size. I will see for myself because i will be putting on same size PS pulley in about a month and a half, after my nice pathy TB goes on next sat.

 

You do whatever you want...all I know is that reducing the pulley weight by a couple pounds isn't going to give anybody 3.5hp at the wheels...maybe a couple at the crank. This is madness...I'm done.

Spence