Hey Maxima Brothers,
I was considering adding an underdrive pulley to my 96 SE 5 spd. Are there noticeable performance gains from this mod? Currently I have a Stillen Y-pipe, custom intake, and a short shifter. I also have a 50 shot of NOS that I'm installing, but I lost the damn microswitch while driving and not tightening it. Hoew much will a UDP help with the current mods? Please let me know what you guys think.

 

i believe that it gives you more low end power

 

Increase accessory life, motor revs quicker.

Ken

 

THe pulley works for the 5spds but useless on autos. THe pulley provides some extra bottom end power. DO not expect to see any more gains then 3-5hp tops. If you have a big system i would not suggest getting this mod. It slows down all belt driven components.

 

That is incorrect about the automatics.

However, let me first tell you about the benefits of the SEARCH function. If you had used the SEARCH function, you would not have had to post this.

 

Give him a brake...hes not even a newbie yet

 

IT HAS NOT BEEN PROVEN ON A DYNO!!! Saying the car 'feels' or 'revs' faster means crap if there are NO numbers to back it up. I'm not picking on you, but I keep hearing miraculous things aboutUDP, but no one can back it up.

 

UDP does ABSOLUTELY NOTHING for a Maxima..

 

there are no facts to prove or disprove, so do not say one way or the other, please.

 

So it doesn't work then...

 

Seems like the people who are UDP-Haters don't have them. Dave be said his traps went up noticeably when he installed his though. I plan on getting it for my car.

 

trap speed went up.. and so did his 1/4 mile time.. but he won't tell you that everyone .. yes EVERYONE who gets a UDP runs higher times.. but NO ONE i mean NO ONE has proved me wrong yet..

 

I ONLY put on performance mods that have been proven. UDP is UNPROVEN, so it will not go on my car.

 

thats why i am UDP hater #1...

 

Well, a few weeks ago in 75 degree weather, I ran a 14.75@95mph with a 2.28 60' (I'm awesome at getting 2.28s ). A handful of Maxima owners were there to witness my single run of the day (I gave them my helment so they could race). As you can see, with the same 60' and in weather that was 30 degrees warmer than when I ran my 14.73@94mph without the UDP, I was only 0.02 seconds slower yet my trap speed higher. We're talking 2 hundredths of a second, people. With my UDP and warm/hot weather, I've been consistently in the 14.8s@95mph. Before the UDP I was consistently in the 14.9s@93-94mph. I was going to run last Sunday in much cooler and drier air, but I had forgotten I had to go see my Wife's relatives. My track has now closed for the season, but I 'm gonna try to go to a track 70 miles south of Kansas City and make some runs. I plan on crushing my 14.73 if the track can hook up.

Judging by all my timeslips with and without the pulley, I think it works. I plan on dynoing my car next Saturday. Without the pulley, I've pulled 176fwhp and 194fwtq.

The only downside to the UDP with a 5 speed is the fact that it is harder to start smoothly off the line and on the 1-2 shift.


Dave

 

until someone dyno's that thing AGAIN and proves Tony C's dyno wrong (1hp gained low end.. 1 hp loss high end: which makes no sense to buy because when you run 1/4 mile you launch high and you shift at redline) then i will shut my mouth..

so i will continue to be #1 UDP Hater.. and stick by my points.. it is a USELESS MODIFICATION FOR A MAXIMA..

run lower and dyno more Dave.. do it for your UDP brothers

 

What the heck???

When I had my max, I dynoed the car right before and right after installing the UR UDP.

I saw 8-10 HP at the wheels from idle to redline. The UDP reduces the load the accessories have on the engine.

It is so much more than proven it's unbeleivable. Ask any mustang owner / enthusiast.

The only problem I had with mine was that the oil seal wore out at about 80,000... a 12 dollar part, so who cares...

Get one, install it, and enjoy. Worth every penny.

 

muhahah ...

8 - 10 at the wheels... muhahhaha

what kind of dyno is that? canadian dyno with metric mesurements.. muhahhahaha.. you talking Horsepower? or pony power?

even UDP owners here would not give that generous an estimation

pick me up off the floor...

not even the y pipe alone gives a legitmate 8 - 10 at the wheels and its the best bang for the buck.. muahhaha.. someone stop me.. please i can't take anymore..

hahah

 

I'll dig up my old Dyno runs and post for you tomorrow...

 

You won't get 8-10 HP off of any UDP you could possibly think of for the Maxima. Hell Even iff you took the accessories out, you wouldn't get that much.

 

and how is that going to prove that the UDP was your only modification? jeez.. only thing short of a video would prove that..

i could dyno a stock car and dyno 165 and then put on UDP, Y pipe, CAI and other stuff and dyno 177 and say its the UDP alone

 

 

Conmgused told me the same thing at Maxus over dinner.

 

Interesting way to spell Confused.

 

he is a smart man

 

I should mention 2 people have told me my car "pulls hard," with the UDP. One such person has been posting about the fact that the UDP sucks. He also drove the car previous to the installation and said no such thing. However, I am getting rid of the car soon, most likely. I would not say anything for or against the UDP. It doesn't hurt the car, but it may or may not so anything beneficial.

 

Why are you getting rid of the car?

 

In comparison to my car at the time, Erica. I still believe its all in people's heads, just like the Tornado thing, or Fuel Magnets.

 

Best time before UDP: 14.599@95.03
Best time after UDP: 14.530@95.94

Guess not everyone, huh?

Not a big difference, but it wasn't a good racing day. HIGH humidity (only got 2 runs in because of rain) and that run was my first, after the 2 hour drive, so the car was nice and hot!

Bottom line, it does work. You will feel it, and it is worth the money. It won't make a huge difference in a 1/4 time but that's not what its all about.

Does a lightened flywheel make your car faster in the 1/4? No, in many cases slower actcually. Does it make the car more fun to drive and more responsive on the street? Of course.

The UDP make the car rev easier and more responsive. Well worth the money.

I can't think of any 5-speed owner that's gotten one that hasn't liked it. Auto's are a different story, they don't even count when talking about performance.

 

I can't even fathom why any of you wouldn't think it would be a worthwhile mod??? You slow down the air conditioning, power steering, water pump and alternator and they don't take as much energy to turn. The transmission attached to the engine makes no difference at all... How or why could it???

 

Sprint-
I've got 16 of slips from this year clearly showing my car is "faster" with the UDP YES!!!! My ets are slightly slower than my BEST, BUT ALL my runs since my BEST (14.73@94mph, 45 degree weather) have been in 75 degree PLUS weather. Are you gonna sit there and say temp doesn't make a difference? Like I've said before, without UDP I was averaging 14.9s@93mph this year with a handful of runs in the 14.7-14.8 range at 93-94mph. With the UDP, I've consistently been in the 14.8 range with trap speeds easily exceeding 94mph. Many of my traps exceeded 95mph (best of 95.5mph) which ain't bad in warm weather and NOT sea level. I'm planning to dyno my ride very shortly.

BTW, when the guy dynoed 1hp gain low and a loss up top, was this on the same dyno?

Also, the UDP reduces rotational weight. It doesn't matter if you're going WOT at low rpms or high rpms, the gain is still there. For some reason people seem to think that once an object is up to "speed", a heavier object (the stock pulley) is just as easy to accelerate as the lighter object (UDP). Not true at all. The rotational weight is there at all rpms therefore the motor must overcome the weight. The same thing applys to heavier wheels.


Dave

 

I found my Dyno run with the Max...

http://albums.photopoint.com/j/View?...nce=0&res=high

You can clearly see all the power gains.

The baseline is the red curve. 155.6 HP and 174.6 lb-ft of torque

With the addition of the Budget y-pipe and cat-back, Stillen Cone intake and synthetic fluids you can see the green curve. Peak power was up to 176.3 HP and 188.6 lb-ft of torque. A delta of 20.7 HP and 14 lb-ft of torque.

The final curve, the blue one was after the installation of the Unorthodox Racing Underdrive Pulley. Silver in color if that matters. The curve shows a peak power output of 182.5 HP and 198.3 lb-ft of torque. A delta of an additional 6.2 HP and 9.7 lb-ft of torque.

The car ran a best of 14.72 @ 93.5 MPH at the strip, as I recall, it was a while back.

Anyways, that ought to be proof enough for you.

 

That's impossiable! If Sprint and his gang say it doesn't work, how could you gain HP?!?

 

UH, I don't know who 'sprint and his gang' are, and I don't doubt their technical prowess, but how can they argue with the laws of physics.

You guys asked for proof, there it is.

 

Oh, I agree, don't worry.

I don't know if you recall Dave, but you sold me a Cattman y-pipe about a year and a half ago. We met at a hotel in St. Catherines...

Anyways, people here who have the UDP, Dave B, myself, have been insisting that they work for quite a while...while those who do not have one seem to know that they don't. Go figure.

 

More proof that the UDP works:

I gained an average of 2mph trap speed from the addition of the UDP while using a 50-shot NOS....before the UDP I would only hit low to mid 97mph traps....now I hit consistant 99mph traps..

I really don't thing E.T. should be used to measure performance gain per mod....MANY MANY things including launching and shifting will decide E.T.....trap speeds are the most consistant thing to prove the gains of a mod.....period....

 

hehe. thank you. I love you guys.

 

hey if you guys feel like wasting $150 on a UDP.. go right ahead.. but its as what it is.. its a waste

 

So now that there are perfectly legit numbers on the table that's all you can say? A waste?

What do you think account for his 6hp gain? Magic?

 

So we have one person that dynoed it and got a 6 HP difference, but he hasn't been to the track IN THE SAME CONDITIONS to see if he got 'any faster'. Then we have someone who got .06 faster(), but again hasn't run UNDER THE SAME CONDITIONS, but hasn't dynoed the car. Until you have both dynoed AND run under the same conditions, your emperical data will stay unproven.