neuronbob

Yes.

He also sells an underdrive pulley specifically machined for the RL.

Excelerate, a registered vendor, also sells UR underdrive and stock-size pulleys.

themuskr

i'm a noob when it comes to engine mods what exactly does a underdrive pulley do?

neuronbob

It underdrives the equipment controlled by the belt associated with it, mostly the AC. This theoretically allows less engine power to be diverted to secondary devices, meaning the engine devotes more power to moving the car.

It theoretically adds a few hp. No one has done before and after dynos on the RL with this mod, so we don't know precisely how much power this adds. However, most people with the mod indicate that the engine revs more easily with this mod, so it at least feels more powerful subjectively.

Excelerate

iTrader: (1)

There are two aspects to the underdrive pulley by UR.

1. It is an underdrive pulley which underdrives the accessories by about 15-20%. The result is less parasitic drag on the system which can help improve hp.

2. The pulley is lightweight. Most of the gains are in the lighter weight, not the underdrive. The underdriving portion maybe adds 1-2 HP. The pulley weighs less than one pound. I think I weighed it at 14 ounces. This is why it gains power.

You will want to get the stock size pulley if you have a large stereo system (over 600 watts RMS).

Chas2

What is the difference in weight between a stock pulley and an underdrive.?

Excelerate

iTrader: (1)

It was around 2-4 ounces.

Chas2

That would seem to be nothing if the original pulley was like 9 lbs. It would seem like the safest bet would be to stick with the stock size, stock belts, etc., then it would be a lot more difficult for Acura to try to screw with you on the warranty should something happen.

Blazing GT

2-4 ounces. I read somewhere that it is 7 pounds lighter

Chas2

Theoretically, the crank pulley weighs about 1 lb. The stock size should weigh slightly more than the underdrive size, so a few ounces makes sense. UR says the stock pulley weighs 7.65 lbs, so the UR is really about 6 pounds lighter.

Ballinger

Huh? It's either 2-4 ounces (ie 1/8 to 1/4 lb.) or several pounds lighter. The two options are vastly different and not interchangeable.

What does the pulley we remove weigh? Does anyone know?

What does the replacement pulley weigh? Does anyone know?

Post the weights and we can all do the math in SAE or Metric

neuronbob

Yeah, my understanding was that the stock pulley was a bit over 7 pounds. I could be wrong, though.

Chas2

I was unclear. Let me try again.

Here is the link to the mfg for the stock sized aircraft aluminum crank pulley

http://www.unorthodoxracing.com/Item...rtID=020611412

Crank Pulley
Part ID: 020611412
Regular Price: $231.00
Product Weight: 1.00
Shipping Weight: 1.16
OEM Weight: 7.85

Shawn at UR says the part number corresponds to the stock diameter pulley, and it uses the same belt as stock.

He is at info@unorthodoxracing.com
631.586.9525 x16

Acura OEM crank pulley weighs 7.85 lbs
UR stock diameter crank pulley weighs 1.00 lbs
This means the UR stock diameter crank pulley is 6.85 lbs lighter than the OEM steel pulley.

The UR underdrive diameter crank pulley, according to Excelerate, is 2-4 ounces lighter than the UR stock diameter crank pulley, so that 20% our so underdrive does not buy you that much in weight.

I do not know what real effect the underdrive has vs weight reduction. I guess you would have to see dyno testing to understand that.

themuskr

Still trying to find that Azect grill! anyone khow where i can get it?

Ballinger

Chas, you nailed the details this time, and I think that wil be useful for many.

I see now that the aluminum pulley is 6.85 lb lighter than oem, and that roughs the aluminum underdrive pulley at about 7 lbs lighter than oem.

neuronbob

Thanks, Chas, you nailed it.

If I were going to do a pulley, I'd do a stock size one to avoid warranty troubles. I'll think about it when my car has a few more miles (like above 50k--e.g. in another year).

Excelerate

iTrader: (1)

The OE pulley is about 7.5 lbs or so.
The UR underdrive pulley is about 14 oz.
The UR stock size pulley is about 16 oz or 1 lb

I don't see how 2-4 ounces is that off. The UR pullleys are about 6.5 lbs lighter than the stock OE pulley. I was merely explaining the weight difference between the UR underdrive pulley and the UR stock size pulley.

neuronbob

Thanks for the clarification.

Ballinger

We appreciate that, and thank you for the clarification. What was unclear, and therefore completely "off" was the unintended implication that the total weight savings was 2-4 ounces over the OEM pulley.

What is now clear, as you can see above, is that:

OEM Pulley: 7.85lb
Aluminum Stock Diameter Pulley: 1.0lb
Aluminum Underdrive Pulley: 0.875lb

In terms of weight savings, were one to ask,
...then the correct answer would be, "about seven pounds."

If the weight of the pulley is very significant to the performance enhancement (some claim it is, some claim it's not), then a seven pound difference is big news! In fact, if one were to believe the weight issue might have more "effect" than the underdriving (as some also claim/opine), then the "nearly seven pound" savings by going to an aluminum, OEM sized pulley might just turn out to be the magic bullet.

This thread, with line-item weight information in it, should be useful to many reading the site with exactly these questions in mind.

Excelerate

iTrader: (1)

You're welcome.

The majority of the power is due to the lighter weight of the pulley, not the underdrive. In fact the underdrive only frees up maybe 1-2 hp.

Ballinger

I've read similar statements on some review sites, and your comment seals the deal for me on the issue. I'd like to know how much the OEM-sized uber-pulleys cost, and whether they come in tasteful, fall colors.

fatty

anyone have the lightweight stock one??? Please comment

Chas2

As far as I recall, everyone on this board that has a pulley has gotten the underdrive version.

Excelerate

iTrader: (1)

http://store.excelerateperformance.c.../i-220260.aspx

Ballinger

Thanks.



$200 at Excelerate, via the link above. This may not be the exact pulley shown as an example.

470hpGS400

iTrader: (1)

Should be a sticky

Ballinger

I agree: this thread could be a great sticky.

Blazing GT

I vote Sticky!

BoostedAWDRL

Hey Touge, Any chance you or anyone else on the board can share the sites where we can purchase these parts? Or even a number and contact to reach a retail store would be fine also. thankyou.

Blazing GT

you can visit www.visionaryracing.com

Touge is no longer with the RL. Also your name makes me think your RL is supercharged. If so, how?

Jamesgt727

Has anyone intalled the UR Underdrive pulley? Belt Part number? Any negative effects after install? Noticable positive attributes after install? Please let me know. I cant wait to be able to post sim pics of my RL.

nyctl

you know GT massive, sometimes you shame the BK....
boosted also means stolen. lol!

jobrien455

What does the amuse exhaust cost? installed? Where do I find it?

What is the Apex module controlling? Or is increasing the ignition charge/current?

Ballinger

I found a photo of the UR pulley for the RL, and it includes a bonus shot of the belt:

SCRAPcity1

nice pipes... no homo

dnwsports

i want the aztec grill - where can i get one?

afjock21

Well, IMHO the RL shouldn't be modded all that much.. I personally think it's stunning as is and with a few small mods, makes it really stand out from the crowd.

So first, how can I get a cold air intake fit for my RL?

Second, what is stainless steel brakelines gonna do for me? I think the braking is just fine.

Ballinger

Do a search in this forum for AEM CAI or AEM Cold Air, and you'll find a lot of information, including that ther AEM kit that fits your car is the one they list for the TL with the same 3.5 liter motor as in ours.

Stainless steel brake lines make the brakes firmer and women drip off the car like honey. It's the braid.

Derk's K24

I've looked around but haven't seen what the A spec kit is costing folks. Anybody?

neuronbob

$1200-$1500 assuming you're talking about the underbody kit.

Derk's K24

Yeah, thanks! That's actually not too much more than what I paid for the HFP kit for the Accord which was $800. That was with a company discount though... Luckily the GF's cousin has worked for Acura for like 15 years so he made be able to trim that down a lil for me. I'm make all these plans for a car that I probably wont be getting for another 6 months and it wont even be mine! LOL!