I'm looking to increase low end torque even if it means sacrificing some top end power (the max already has plenty of top end to spare for my purposes! ). I've got the UR pulley currently but I'm wondering if going back to the stock pulley would help.

Does the lightweight pulley for the most part shift the torque curve towards the top end?

Keep in mind torque IS horsepower (HP = torque * RPM / 5252), so in essence I'm wanting to increase low end horse power, or put another way I want to shift the torque curve upwards at lower rpms. I just want better low end pull.

I'd appreciate any insightful comments or info on this. Thanks!

 

The UR UDP's are actually supposed to increase, or free up torque/HP down low and off the line. Going back to stock would only make you slower. And I don't think you gained a big boost from the pulleys anyways...I doubt pulleys have as much of an effect on 3.0L japanese engines as they do on big american engines.

 

a few locals have the UDP along with a the basic bolt ons, and they haul @$$ - they can hold up with some 5spds -

 

 

hmmm.... thanks Craig. I was just thinking about how a lightened flywheel, for example, raises the torque curve at higher rpms but it's lower at lower rpms. I guess i'll swap it out this weekend and test it out with the ol' butt dyno!

 

Yeah but the flywheel has rotational mass and intertia that is what helps it with the hills and holding speed. However, the little pulley doesn't turn enough weight for it to really work in this way, if anything it should help your off the line power. With your A/c on your off the line power is hampered, with a heavier drive pulley it would be very similarly hampered.

 

Stock pulley = slower.

Stay with the UDP.

Try putting back the stock airbox. I replaced my JWT pop with the stock intake and wow....I have low end torque back.

Chris

 

taking off the UDP would make your car faster and let you have back your 1 hp you lost when it was installed

 

huh???

 

warning..you just asked sprint to explain himself.

and he is very...... honest about his view of the UDP

stand by..you might hear about the ECU as well































sprint

 

That's cool... I think I just found my answer. Before and after dyno's - UDP only.

 

good I am glad you know what I am talking about... let me guess the search fucntion worked again

 

You know, I didn't really find what I was looking for when I did a search (which really IS unusual!). But I remembered Greg's page.
Ol' Sprint may have a point though because Greg superimposed the LOWEST "before" dyno run with what I'm assuming ended up the highest "after" run. And, even after this, very little gains show on the before/after dyno page, plus it doesn't show what happens at the very low end (1K-2.5K rpm's). I may swap them out this weekend and see what it feels like (if I feel up to it ).

But I am kinda curious to know the REASON (meaning technical) why Sprint has the strong opinion he has.

Sprint?

 

Please explain.... I don't get it. I just installed mine and I am having crank pulley sensor trouble.