DRR98

To be clear- no noticeable gains from swapping the stamped steel crank pulley for the same size in alum. Must under drive.

When under driven the energy used by the alt and p/s is reduced. The energy saved goes to power the drivetrain instead. Not much, but noticeable.

JCRDX11

So the underdrive crank pulley will be ideal.

Can this be done XLR?

DRR98

JC See post #40...
Originally Posted by Rotary Rocket
So are you saying the underdrive pulley would be available for $200-$250 right away?

Is it the same as your TSX, RSX pulley?

It sounds like we don't need a group to sign up for the underdrive version.

Rocket asked about cross ref to existing stock (TSX, RSX) for an UD pulley...
XLR8 responsed -I don't know yet. I've ordered a stock crank pulley. I will find out by Monday.

Excelerate

iTrader: (1)

This isn't true. The majority of the gains are from the lighter weight, not the underdrive. The underdrive pulley free up more hp than the stock diameter pulley but it isn't a huge difference. The underdrive pulley only presents a problem if someone has a large stereo (600 watts or more).

Excelerate

iTrader: (1)

The RDX Crank pulley arrived today. It is larger in diameter than our stock TSX crank pulley, but not by much. I am sending it to UR for measurements and will let you know what we find. I believe the TSX pulley will fit but I want to confirm.

The stock RDX pulley is about 5 lbs and our pulley is about 13 oz for the TSX. The TSX pulley is about 6"; the RDX pulley is about 6.5" but it has a larger lip so the lip is throwing off the measurement.

Rotary Rocket

XLR8,

BU was kind enough to do some research (see post #19), the power steering pump pully has the exact same Acura part number as the TSX.

Can we diduce that we can also use your TSX alum pully for this portion also?

Do you think the RDX crank pulley has a larger lip because it has a thicker belt? Would you need to take that under consideration when you come up with a replacement pulley?

I look forward to this (these) pulley. Thank you for taking the time to make it for us; it is very much appreciated.

Cheers.

DRR98

XLR8, thanks for the info. Not the first time I've been wrong nor the last.

So 5 lbs vs ~ 1 lb? 2.7 Whp gain per lb removed w/o ud? So ~ 4 lbs or ~10.8 whp? An increase of ~ 5% with only a non-u/d crank pulley swap?

Why would a mfg (Acura) not offer this as a factory option. Is there any purpose for that extra 4 lbs?

mstolars

It's all about cost from Acura's point of view, they can make these steel pulley's for cheap whereas the lightweight aluminum costs would throw off their profit margins.

DRR98

Not sure why an OPTION would have to be sold at a loss?

Excelerate

iTrader: (1)

Sure, we can add the P/S pulley into the package and make it a 2 piece kit.

I'm not sure on the crank pulley lip. We will find out more once UR inspects the pulley. I don't manufacture pulleys so I will leave it up to the expert to answer that.

And thank you and you're welcome.

On the 1G TSX there was a 10 whp/10 wtq gain from the pulley set. You can expect 7-8 hp gain from the crank pulley. You will also notice that the car will rev out quicker.

The manufacturer designs vehicles for the mass market, not the aftermarket. That's where we come in. You won't see them releasing intakes or pulleys or other mods for the most part, only exhausts and suspension.

Excelerate

iTrader: (1)

So UR received the pulley and said the following:

The current pulley you have is 5.6% smaller, thus it’s a 5.6% underdrive.

I would say based on the percentage of reduction K070669 should work but to be safe I’d suggest having K070673, K070655 K070653 available for test fitment.

Otherwise everything looks good!

So I've added it to the website.

http://store.excelerateperformance.c.../i-534402.aspx

JCRDX11

The link is for one pulley and not a two piece set? Product is made to order or some is in stock? It comes with the proper belts correct?

DRR98

So $220 plus shipping?

W/belt?

Sorry for all the questions but that extra mass of ~4lbs, does it serve any purpose?

Damping bearing vibration? I've heard turbo engines are harder on brgs.

Excelerate

iTrader: (1)

The link is for one pulley: the crank pulley. It is good in stock. It does not come with a belt.

Yes. Belt is not included.

You can see more info about the pulleys here:

http://www.unorthodoxracing.com/faq.aspx#section2

JCRDX11

Ok - so is this a underdrive crank pulley or the stock diameter (Lightweight pulley)?

If it is stock diameter - Can we just our stock belts or does it needs to be replace?

If it is underdrive pulley - Where do we get the belts and part number?

Rotary Rocket

It is an underdrive pulley, see post 51.

XLR8, please take the time and provide information for the belt needed for your underdrive pulley.

Is the TSX alum powersteering pulley currently not avialable?! You stated you "could make a two pulley kit", still a possibility?

TIA

DRR98

5.6% smaller than what?

XLR8,
I would buy a 2 pulley set u/d w/alt and ps pulleys.

Is that impossible? I want go there

Excelerate

iTrader: (1)

It is a lightweight crank pulley with a slight underdrive (5.6%). You will need a different belt, a shorter belt. We are confirming the belt part # through a member who ordered the pulley yesterday. It should be K070669.

I would have to order the P/S pulleys. I have the crank pulleys in stock. The P/S pulley was the same part # as which year TSX?

5.6% smaller than the stock pulley.

You listed 3 pulleys above: crank, alt and p/s. We won't be making an alternator pulley unless it corresponds to a current part # already made.

exist12

iTrader: (1)

alternator pulley is the same as the tsx pulley is that one made already

JCRDX11

I am the one that order the pulley yesterday.
The pulley was received at my work - I am waiting for the belt and will try to get it install next weekend.

DRR98

JC, Can you log and post a couple of 0-60 runs before and after your pulley change.
And pics of the pulleys side by side as well as stacked? Please.

JCRDX11

Look what I have that will be install this weekend.

UR Pulley, stainless steel down pipe & dei titanium wrap

Don's downpipe will be coming out - anyone pm me if they are interested.

wspy

Why did you change the DP?

DRR98

JC,

Ha Thanks for sharing, but that is kind of a dirty trick. You hid the pulley behind a thin veil so we see only enough to know what it is and begin to drool.

Ha, How Rude!

Seriously, If you have any kind of data logger at all please do - 0 to 60 pulls before and after the pulley swap. Please2.

If you can plot whp and tq, that would help also.

Even a stop watch is better than nothing if thats all ya got.

You can help educate your extended RDX family.

So the dei wrap has ti foil on one or both sides?
Less able to absorb moisture and better insl?

Looks like the new dp has flanges made from non-ss.

I'd have them clean the inside of the flanges with a wire wheel (cup) before inst to remove the rust esp. where the new doughnut seals seat.

Hope it goes well. A ask your installer up-front if you can take pics of the inst.

The worst they can do is tell you no. Most shops have access rules. But ask for permission to step in a key points to take pics.

Educate us please.

Pulley swap = +??whp, +??tq, 0-60 imp=.??sec

DRR98

Any update JC?

crxtype-r

sign me up for the pulley and if anyone can help would love to purchase a down pipe and mid pipe kit with the 02 extension thanks guys.

crxtype-r

hey man def interested in downpipe and pulley

JCRDX11

Sorry for the delay - I didn't have time to log the before crank pulley.

Just had it install this weekend and the shop told me the new belt doesn't fit and not needed. He used the stock belt on the RDX.

Can someone confirm that the crank pulley is at the bottom of all the pulley. (Lower part of the engine?)

Information shows it is the same crank pulley for the TSX.

The car does seem to rev a little faster and pulls hard on higher. (Butt dyno)

I really want to dyno this car to see what numbers I am putting out but I want to wait for a piggyback system first.

Lanesky_OH8RDX

I have heard the doing pulley's can over rev certain parts of the motor and cause premature or just plain failure. Some resistance is nescessary. true or false?

Excelerate

iTrader: (1)

False. This is a mechanical part. It is just lighter than stock.

DRR98

[quote=JCRDX11;13790649]Can someone confirm that the crank pulley is at the bottom of all the pulley. (Lower part of the engine?)quote]

The crank is the lowest pulley.
The a/c pulley is just in front & slightly above it.





So using stock belt w/UR pulley equals zero u/d (not -5.6%) when compared to stock RDX crank pulley?

In other words the same diameter for both?

XLR8 mentioned some confusion about the lip throwing off the measurements?

Rotary Rocket

[quote=JCRDX11;13790649]Just had it install this weekend and the shop told me the new belt doesn't fit and not needed. He used the stock belt on the RDX. quote]

XLR8,

So do we need a new belt or not? Are we loosing the needed tension on the belt if we stay with the stock belt since I imagine the new pulley is smaller than stock.

Then again if it is 5.6% maybe it is not that much of a difference to actually matter on the belt.

What is the normal (average) decrease on your other crank pullies that you have made for other Acuras (as in what percentage smaller)?

JCRDX11

The shop told me that the new belt I got was not needed and didn't fit.

So if there are any tsxer lurkers that needs this belt (brand new) - let me know

He used the stock belt and it fits perfect - doesn't seem loose or anything.
I need to try to snap some pictures but it looks like nothing was change beside when I look all the way down and see the brank new crank pulley installed.

Waiting on one member that seem interested in the downpipe and should be giving me a response by the end of today.

If not; it is up for grabs - I prefer local since it is much easier to deal with.
Pm me if there are any interest.

Thanks.

DRR98

I question the UR crank pulley being 5.6% u/d vs stock RDX crank pulley.

In post #58^
Originally Posted by DRR98

5.6% smaller than what?

XLR8,
I would buy a 2 pulley set u/d w/alt and ps pulleys.

Is that impossible? I want go there

XLR8 Reply...
"5.6% smaller than the stock pulley.

You listed 3 pulleys above: crank, alt and p/s. We won't be making an alternator pulley unless it corresponds to a current part # already made."
I still count two, but thanks anyway.^

In post #51^
XLR8 Quote..."So UR received the pulley and said the following:

The current pulley you have is 5.6% smaller, thus it’s a 5.6% underdrive."

^My guess is they mean the stock RDX pulley is 5.6% smaller than the stock TSX pulley.

Making it 5.6% u/d only in comparison to a stock TSX crank pulley not a stock RDX crank pulley.

Which means it is not u/d in RDX application.

Pics with a tape measure or calipers beat the crap out of the guessing game we got here.

Excelerate

iTrader: (1)

You guys are making this a lot more confusing than it needs to be. The crank pulley we are selling is 5.6% smaller than the stock pulley so there is a 5.6% underdrive. If the factory belt fits then that's fine. I haven't tested a belt here because no one with an RDX has come here for me to test fit.

JCRDX11

Not sure but it seems a little unfair to me now that I see Excelerate drop the price from what I originally paid for it.

Excelerate - can you advise DRR88 questions and why you drop the price right after I purchase and try it out for you?

JCRDX11

Anyone looking for Don's Downpipe - i have it off my car.

Pm me for the details - prefer local but can ship.
Thanks.

Rotary Rocket

Just ordered my pully. I guess I will just use my stock belt on it.

JCRDX11, did you try to buy an alum PS pully for the TSX since it is the same for our RDX at the same time?

Did you change it yourself or took it to a shop?

JCRDX11

Sorry for the delay - somehow i overlooked this posting.

I purchase the pulley from Excelerate; document shows it is for a tsx. (Alum)

I took it to a shop to have it install and they used the stock belt that came with the car.

The new belt Excelerate advise does not fit.

Rotary Rocket

JCRDX11,

I was asking if you got the alum power steering pully, in addition to the alum cranck pully.