TLOHTL

Hi Azine,

There has been a lot of talks in regards to this NEW XLR8 design.

This thread is here to assist those interested in doing this mod.
I will have a : review, pics, vids & DYNO sheet.

First off :

Car : 2005 Acura TL 6-spd

Mods : Aem cold air intake, Outlaw Engineering Spacers, RV6 V3 PCD's.

Car made : 240whp with the above mods.

Now onto the latest mod :



This is the NEWEST XLR8 UR Pulley. It is even lighter than the original. This is the Standard size Pulley.

The install was pretty easy. Had it done right on the DYNO.
We did a few pulls b4. Made 240whp.



All done ! Looking Nice....Now let's see what it can do POWER wise.....



( Don't mind, car is a lil dirty.... )

And the moment we have all been waiting for......





And now my review on the mod : (4WHP/2WTQ)

Well where to start ? Another GREAT mod from the boys @ XLR8 Performance !

The car drives so much ( lighter ) persay.
It's as if you have a trunk full, and 5 ppl in the car. ( This was b4 mod ) Now it's like your the only one in the car and it just wants to go! ( after this pulley mod )

You can really feel the car accelerate much much easier !

I put about 800kms on it so far ( highway, city etc. )
And I LOVE it !

If you were on the fence with this mod..... JUST GET IT

vietxquangstah

iTrader: (7)

Nice!

thisaznboi88

iTrader: (7)

Finally some Dyno numbers!! Now people can stop bashing the pulley and say that it makes no power. I love my UR pulley

pimpin-tl

Pulley's do not gain measurable HP. 4 hp and 2 TQ can be a threads-hold difference between the 1st dyno run and the next. temps also can change that.

TLOHTL

Yes finally some dyno numbers.

This thread was to illustrate that these pulleys do add power. 3 pulls were done b4 and 3 after.
Hp/tq was same b4/after with each run off by a ( .1 - . 3 )

pimpin-tl

Umm means nothing. Like I said the threshold difference can be caused between the different pulls and temps. UDP pulleys DO NOT gain HP period.

thisaznboi88

iTrader: (7)

^ don't shit on his thread. There is finally numbers. No one else ever post stuff.

JTS97Z28

iTrader: (4)

I kind of agree with what pimpin-tl said. I dont want to be one to shit on the thread either because thats awesome that this guy went out and bought the mod and even had the car dynod. I just think that 4whp is such a small number than you can see those differences or more just between each pull. And then to come on here and he made it sound like he added a supercharger or something with the description of how it felt LOL. I mean we are talking about a pulley......

bigballer8526

agreed, but there's a big difference if the 4whp gain is throughout the powerband or just limited to a certain engine speed. cant really see the graph that well, so cant comment on that

anx1300c

iTrader: (2)

Props to you for doing this! It's stupid to think that lowering parasitic loss through everything after the crankshaft can't show anything on the dyno. If this were the case, then why would dynos that bolt up directly to the hubs, thus eliminating the wheels, always read higher? Obviously, the pulley gains will be smaller than eliminating the wheels and tires, but physics dictate it will gain power, albeit miniscule. And again, the gains will be most prominent in first gear and drop off in each subsequent gear; inertia at work.

That said, c'mon, it feels like you lost four passengers and a trunk full of gear? Are we talking hamsters as passengers and a trunk full of cotton balls? I know what my car feels like with just two average weight passengers and a trunk full of luggage, and then how it feels unloaded. I felt nothing when adding the pulley. It's your mind playing tricks.

But again, I do thank you for contributing to the forum.

Steven Bell

iTrader: (2)

Nice work.

DomGSR-T

iTrader: (1)

Thanks for your work/time for that great test! that's the numbers I tought that mods would do and I'm glad I don't have to test it myself to make sure I will do other same day dyno soon with different parts.

TLOHTL

Thanks ! And sorry if Im making it sound " too good ". But what Im trying to say is it's not just about the 4whp. This mod only adds 4whp/2wtq. This mod was installed on the dyno took 40 min. 3 pulls b4 and 3 pulls after. 3 pulls b4 were all 240whp. 3 pulls after were all 244whp. Ok enough with the numbers.

The best way to describe this mod is the car accelerates much more effortlessly.
Thats why I used the 5 people in car and trunk full vs. Only driver.
This is NOT the crazziest or the Best mod for the TL ! But it is worth every penny and you can feel the difference.

Dave_B

Agreed. I had a UR UDP on my prior 96 Maxima. Dynoed it and it made no measureable power. 1/4 mile runs after were actually fractionally slower because the reduced moment of inertia made the car harder to launch and 330' times were reduced. It bogged much easier. After about 40 1/4 mile passes and 1.5 years, I got rid of the UDP. It's snake oil. Never again. The car was no slower when I put the OEM pulley back on (7.5lbs vs 1.2lbs). Consistent upper 14.6s@96mph with the UDP and consistent lower 14.6s@96mph without.

rossv1

Excelerate

iTrader: (1)

Thank you for the dyno numbers and feedback. Glad to see you're enjoying the product. It's an inexpensive upgrade and even the dyno numbers don't fully reflect how much more responsive the throttle is after the upgrade.

Sonnick

^ This to the T.

I felt the gains of the pulley in 1st gear only. 5 passengers and a full trunk..............lol.

TurboGSR96

I am unfamiliar with the stock pulley, is the stock unit just a pulley or is it a damper?

maharajamd

iTrader: (1)

^The stock pulley has a harmonic dampener in it. These are solid.

It's a huge debate and not worth bringing up. Many enthusiasts run many miles with aftermarket "solid" pulleys.

TurboGSR96

Lol I know, i wonder how many of those enthusiasts drop their oil pans and check their bearings after 50k miles... for minute gain ill pass for longevity... the stocker is a damper for a reason imo.

1black_seven

iTrader: (2)

Someone mentioned to me that our engines were internally balanced.
When I installed mine, my first gear felt lighter coming off a red light but that's about it.

gilla_monster

iTrader: (2)

I would venture a guess that you really wouldn't notice a difference with the UR pulley UNLESS you replace the dual mass flywheel at the same time. There is so much power required to get that behemoth turning that the much smaller and lighter OEM pulley just goes along for the ride. I could see how some people, eager to get a tickle from their butt-dyno, would "feel" a difference, but in reality, it would only be off idle RPM.
Like spinning a bicycle wheel vs. a motorcycle wheel; once you get them going, inertia does the rest.

Joneill44

Part # ?

callahan

I did notice a slight change with the pulley, when I installed my LW flywheel it was a huge difference. Car revs much more freely now, take offs are a different story lol.

Fatfrii

the argument that it makes no gains is invalid until there are more dynos done like this one. Never criticize someone who is in pursuit of any type of knowledge. Good job OP and encourage more people to Dyno after pulley installs.

Grand_hustle17

Unless temps are dropping 20 degrees or more withing that 30-60min time frame i dont see how you can really say otherwise when clearly... Cleeeearly this is shown to make power... Whether you want to call it measurable power then thats your ignorance... The pulley makes power... And just so you know, temp changes arent always beneficial to making power so unless you can prove otherwise you should quit the hating...

anx1300c

iTrader: (2)

Temperatures mean nothing on a corrected dyno anyway. The correction factor software adjusts the numbers accordingly for any ambient changes. There was a thread on here in which a mechanical engineer mathematically proved the gains in each gear that the pulley would show.

Excelerate

iTrader: (1)

It does make a difference regardless of installing a LWFW or not. It's not going to throw you back in your seat but it is a worthwhile mod for $200.


Here's the link:

http://store.excelerateperformance.c.../i-291887.aspx

anx1300c

iTrader: (2)

Josh, is your site going to be functional soon? Been trying to place an order and keep getting 500 errors.

fsttyms1

I have seen mine with over 220k on them and they were just fine (when i swapped the motor for the 6 speed conversion) Current motor has close to 400k on it with 200k with the light weight pulley on it (on and both motors were 15k oil change intervals). And i will put it on my new 3.7 motor im putting in. Saying you will loose longevity without knowing

fsttyms1

And those that think that it doesnt make a difference, why do you think F1 engines go thru such drastic engineering to reduce every ounce of rotating weight. Because it makes a difference. Years ago I built a 327 engine that had a knifeedged and lightened crank, it was 5.5 lbs lighter than the crank i had originally installed. On the dyno (with NO other changes to the engine) it made around 24 hp more and was able to spin almost 8k rpm (if memory serves me correctly). The motor was MUCH more lively

Its funny some say its not worth it when they are looking for other ways to find every last bit of power . Just the same as those that think that tuning a stock engine just to gain 7> hp isnt worth it. Some times its NOT about the number but the overall drive-ability that makes it worth it.

Excelerate

iTrader: (1)

Just use the normal website:

http://store.excelerateperformance.com/

The HOA store is being revamped as we were having difficulty customizing it.

Scottwax

Technically, a lighter pulley doesn't add power, it just reduces parasitic losses. But the end result is the same. Just like lighter wheels. They don't actually give your car more horsepower but since the take less power to accelerate, you can show gains on a dyno as it accelerates.

And pretty much anything you can do to reduce rotating weight is good. I road bike and a rear wheel 200 grams (about 1/2 pound) lighter was a noticeable improvement. Spins up more quickly. I didn't instantly become more powerful, just had a wheel sucking up less watts than the old one.

Chisel

Scottwax is absolutely correct...

yungone501

iTrader: (4)

Great thread.

Though I was hoping for an underdrive unit to be tested, this helps show me that I admittedly was wrong in my belief of it not adding power. Though the gains aren't as impressive as what I think the underdrive pulley would add, it's still good to know that it does do something.

On the other hand, the dyno shows that power is added at the extreme height of the rev range and torque is improved early on in the powerband. This tells me two things:

1. One can see improved torque below 3500 RPMs.

2. One must rev beyond 6300-6500 RPMs in order to utilize the added power.

To elaborate on number one, I must add that due to dyno sampling, it makes discussing the added torque benefits a bit difficult to do given they begin at roughly 3000 RPMs. That means that the pulley could be either decreasing or increasing (or even neither) the torque prior to what's seen. Judging by the traces, I'd feel safe to assume that it's probably improved prior to sampling so for those wanting to add some momentum down low for city driving or maybe even fuel efficiency (generally the two correlate), running this pulley would be a good idea. Again, unseen traces makes this only an educated assumption but one most will probably agree on that it is seeing elevation long before trace start.

As for the second point, it's not anywhere near as impressive even though the max number is 1-2hp higher than the torque numbers. Because most of the product users are seeing rev limits of 6800 RPMs (or at least the TL and the Accord), that gives a usable rev range of maybe 500 RPMs. And when you think about it, is very little considering how small that scale is as well as the small increase in power you will gain. I've always said that if you can't see improved power or torque throughout the entire rev range or if its not a respectable (definition of this word will differ) amount added in one area, than it's not worth paying for.

Conclusion would be that the product tested here in this thread has its place in the market, sure. But I'd say those who are looking for an increase in torque or fuel efficiency would appreciate it more so than the person expecting reasonable power gains up top. And also, is can agree with those who may say that the product can be purchased for the sole reason of the improvement in both areas but most who buy performance parts aren't generally looking for added mpg's or torque in the city. Shift points when made at or slightly before redline don't drop the engines speed back into a usable powerband that is supported by this pulley. This means that the added torque will only be beneficial from a dig if you buy it for performance reasons.

Again, good to see some official data on the product. Maybe next time someone could do an underdrive pulley. I've always felt the underdrive pulley would give around a 10hp addition but then again, I was reluctant to believe the standard pulley would have a measurable increase in power.

Speeden6

iTrader: (2)

Love how in the other posts Everyone said they want Dyno Proof. Now someone has Dyno Proof and everyone is saying Milarkee (spelling).

The fact of the matter is this is a cheap mod, and is (at leat to me and many others) noticable in acceleration. 4whp is probably generous however it makes gains and helps acceleration.

Basically if you want to say that this part does nothing you are saying XLR8 is scamming us which many of us know is not true. they are a great company we trust and love. Trust they make a good product and dont sell us crap. This is another example of their time, engineering, and efforts to improve the platform.

OP - Great job posting and thanks for backing up product with numbers.

1black_seven

iTrader: (2)

Now if someone could do this with the throttle body spacer