I was on the ARC site the other day and saw they offer a replacement water pulley for the RX-8, kind struck me as odd that they offer it in both +5% and -5% sizes :dunno:

did anybody notice any difference in water temps with the ap pulley under track use?

I will try to find it and post it. I have a mag that compared hp gains with various bolt ons. Underdrive pullies were one of them. I know it would vary from car to car. But at the time I had that planned as one of my first mods. It changed my mind. I will still do it, but it is not a priority anymore. A lot of small changes do add up to a lot. It is worth it for the money as part of a total package. My 2 cent.

damn, i should have become an Agency Power distributor.

You're not going to see any temp change unless you change the thermostat ...

I never threw a CEL when I did my AP pulley install. Then again though, I did flood my car :( Thats what I get for moving into the garage to work and not letting it warm up!

juss bought this and installed it the moment it arrived. it was quite a hard installation because getting down to the pulley was hard. but overall it went well. anyways juss gotta say that i do feel a difference. i know its my butt dyno but juss lettin people know that i did feel a difference. even my girlfriend who didn't know bout the pulley thought my car felt a bit quicker. juss my 2 cents.

waste of money.

why do you say that Kwik?

underdrive pulleys can help on the track by reducing waterpump cavitation. whether or not you see any temp change on your stock coolant gauge is mute. Its a dummy gauge. Also as Team has said before (and I) to really see a temp differance we have to get the thermostat changed. Thats the 1st step to really street test this cooling system .
olddragger

is the t-stat unique to the RX-8?

thermostat opens at 180? using a scan tool ive seen temps upto 205 degrees cruising on the freeway w/ambient temp at 85. i havent done any wot runs and checked temps yet.

does the rx8 have dual thermostats?

does anyones belt slip when its cold/ wet? i think mine slip but idk if its depending on the occasion or not.. if they slip do they need to be tightened or loosened?

Righty tighty

IIRC, the torque for the Crank/Alternator belt is 18lbs and the A/C belt is 38lbs.

yes our thermostat is unique in the fact that no other one will fit and we have no aftermarket one available yet.(That I know of) if people want to keep the coolant temps below 200 then the thermostat needs to be fully open below 200 to test the capacity of the cooling system to maintan itself in that temp range. Without that you are fighting yourself.
OD

i would think that the best way to determine if there are any whp gains would be to do a before and after dyno....
just my $ .02

:D:

PS...vendor results are not trustworthy in general...i once saw an add for AEM CAI with "increases up to 9whp"......:lol:
and that was on the RX8

^Sadly, AEM quoted 15HP and 12ft. lbs!!! so you are being nice with only quoting 9

http://www.hopupracing.com/aemcoairinsy33.html

Sweet, but that dyno is from a forum member, and it just happens to be posted on the vendor site.

Just installed mine...doing the runnning in thing, and will see if it makes a diference after a while......

installed mine last sunday -- Took me longer then normal because I had a few idiot moments.

I can KINDA tell it revs up faster, no real effect on my butt dyno. No negative effects at all on the electrical side (even though I'm running an upgraded custom system - no subs though)

I'm sure the pulleys help - but you wont notice a TON of power - they were cheap and DIY fairly easy so I say its a good fun mod if you get bored and want a little face time with your engine. Unless you are running a high power audio system with big subs - there isnt really a reason to NOT do it, unless you are broke :-p

LOL yeah if the gf/wife is giving you grief you need to play with something else

Install mine on the Sunday that just passed and I must say that my car feels faster. Install didn't take long at all. Maybe because on top of the install, I did the rb exhaust and revi air duct. Car does rev a little faster. As far as the electrical system no effects what so ever. I have a 10" JL w6v2 pushed by a viper 600.1 and nothing goes wrong at idle. I haven't pushed my system all the way since the install and I don't want to. A/C still feels just as cold as before. So what I'm trying to say is I LOVE IT! Recommended.

Agreed...I installed mine about two weeks ago along w/ a midpipe and green air filter...must say that it feels better overall...I'd also recommend the pulley...

I have driven mine around a bit as reccommended and nailed it a few times today....

I cant say for sure there is a diference really.

After the flywheel it was reallly OBVIOUS how much better it was, but seeing as I had already done the flywheel (only recently) and was not really fully used to the new flywheel mode of driving, IM not sure if the AP Pulley has really done much yet....

Ill try and make a vid that adds to my flywheel diference vid, so it will be flywheel and Pulley......

I plan on doing this mod within the week... Allready have it ordered... And let me say that "sometimes" particularly cold days I would get some dimming within the car interior or almost for a sec see it in my HID's, I guess with 10000K bulbs you can tell dimming pretty quick...

Man reason is because I got Alpine's MRP-F450 amp with only one 8" L7 (that I blown the rubber and plastic off of... And since then have had to change it from 2 ohm too 8 ohms...) in a vented box with 4 gauge wire

I planned on getting the optima yellow top, but I'm kind of curious to just try it first and see how bad it really can be...

where's that vid California style ?

my mate with the camera is away on holiday, so Ill do it when he gets back...also wanted to wait for a bit while ECU learns new thing and throttle etc

I ordered my AP pulley from chlmotorcycles for $130 and got it yesterday. Thing is super light and shiney! Gonna put it on tommorow. I'm only really worried about how the A/C will hold up in 115 degrees, but after seeing most of these posts I'm not too worried now

Dave

OK here is vid...its not very exciting, but i tihnk you can make out some diference......

[http://www.youtube.com/watch?v=LwCdf5WzP3k

You guys dont make it easy to decide which mod to do first on an 8.
My only mod on my 05 GT MT is an Agency Power exhaust.....what next???

Flywheel

i second that....

i just installed the pulley, quick question, would over tightening the belts be a no no? I know too loose, of course, the belt may slip, but would too tight cuz harm apart from putting too much tension on the belt?

I installed the pulley, took a good few spins around the block. came back. check the belts, seems a bit loose, then was thinking, would I rather have the belt a little bit too loose or a little bit too tight?

Thx

too tight is not good either - can prematurely wear out water pump/alternator bearings .

The belt will stretch to a point as its heated and stretched through normal wear, just make sure there isn't excessive play in the belts. Have someone else rev up your engine while you are watching the belts, if it looks as if they are really really really wobbling a lot then tighten them one to one and a half turns. A fair amount of wobble in higher revs is acceptable though.

thx for the response. let me recap a bit.

installed pulley. drove around the block. hear a bit or rattling around 6krpm. checked belts. seems a bit loose. tightened. drove for a few days. no rattles. didnt drive car for 3-4 days. checked belts. seems to have loosen up again. drove the car. a little bit of rattle around 6k again.

does everything seem normal? :P

seems normal, did you torque the lock bolts to spec?

the AC yes. the alternator. I dont have a torque wrench with that low of a setting, so pretty much hand tighten.

ok i am now officially a member of the agency power pulley club. i also have a lightened flywheel but i felt the effects of the pulley for sure. it did everything i knew it would......that slight, slight bit of hesitation that comes from getting back on the throttle when your off is gone b/c the pulley is free of the parasitic drag running all the cars accessories. i also noted that the car sounds a little different.....it seems like the exhaust note has changed slightly or that might be the sound of new pulley messing with my ears.

in my opinion this small mod changes the feel of the car immensley. its not like you have so much more power that it affects the feel of the car, but the throttle response and the sound of pulley are very noticable.

BONUS: the first time i revved up my car after getting my lightened flywheel i laughed with joy. after getting the AP pulley installed i did the same and it SOUNDS GREAT!!!! it revvs so quickly it almost sounds like a race car. :)

good job

I ordered mine a month ago and should be here to me in a week or so. I'm going to install it before I go to Nurburgring so I'll tell you guys how it does on that track.

why is it that 1 pulley can make so much of a difference?

it doesnt make SO much of a diference..it makes a "bit" of a diference....

I hope that helps.....

Well I mean, if you can honestly feel a difference of the way the car drives, it has to be a pretty big difference.

You can really feel the diference a light flywheel makes...... the AP pulley is barely noticeable in comparison......

I installed the AP pulley about a week ago and while I agree it is a slight difference, it's definitely noticeable. That makes me really look forward to getting the lightened flywheel. Installation is the only thing that worries me there. Up to this point, I've done all the work myself, but it was pretty easy stuff. Dropping the tranny seems like a step up. It'll be fun either way though :rock:

I just installed my pulley yesterday.. Looks great and feels great i did notice a slight increase in throttle response. The general rule of thumb i use is the belt shouldnt deflect more then a 1/4 of an inch. Ive also heard rules like the deflection should not be more then the width of the belt on the longest span.

i just installed this pulley yesterday and it does feel better in the mid 2- top 3rd gear but everytime i hit about 6500 rpms i get that dam misfire cel....but i feel like this pulley was money well spent looks good feel great