In a fuggin' nutshell, right there. It's amazing how the internet has aided the spread of hype....

 

Actually, to turn the water pump slower the water pump & alternator pullies are LARGER. This is what helps with slippage.

If you underdrive the accessories by replacing the main pully then you'll be using a smaller main pully.. but if you replace the accessory pullies then they'd need to be larger to reduse rpms of the accessory.

 

For what it's worth...

I picked up a 5 rib belt from K2RD a while ago that fits perfectly with no airpump. Because it's so tight it takes a little oomph to get it on but fits fine.

 

But I already ordered my magnetic fuel line thingy that's going to break down the hydrocarbons in the fuel and increase my gas mileage!

Only pulley that's going to get you 15-20 hp is if you're changing the one on the end of a supercharger

 

 

i bought the ones off ebay for 60 bucks.

I was very pleased with them and they came with the correct belt.

direct bolt on.

yeah they are bigger so they underdrive and reduce slippage.

 

I would bet that most of the people who are buying these pulley sets are also polishing underhood components. Bling bling

 

Don't expect an answer from them.

15-22 is a complete bald-faced lie, IMO, but how many people put a car on a dyno just to measure the difference made by pullies? That's why they dare put up such crap numbers.

Anyway, the anecdotal data I remember is no more than 5hp on any car with underdriven pullies.

Dave

 

what would make you say that?

i did mine for performance/reliability. For 60 bucks it was a good deal. Just like my e-bay mp/dp combo was.

not all ppl are vain

 

AND to add to what dgeesaman just said about 5hp max ever seen......I've seen more than 5rwhp change in HP from one dyno run to the next back to back with NO changes at all.

You can make a dyno say what ever the hell you want it to say

STEPHEN

 

hehe it was late and i didnt think about it.... i was just like yeah bigger = faster spinning...... hehehe! ok cool, then this is the proper solution to removing the airpump!! now i have 2 questions before i buy one of these sets.... 1. can you forsee any problems with runnning the pump too slow, like at idle? 2. whats all this i hear about the main pully screwing up the balance? if the pully is itself balanced then there should be no problem right? the reason you need a counterweight when getting an aftermarket flywheel is because the counterweight is BUILT INTO the stock one! oh yeah 3. this is for a 20b so im trying to think about the pully layout if this will function the same... i cant remember off the top of my head (maybe this one is a better one for the 20b section)

heath

 

I said most, not all. I really don't think a pulley kit is going to do much of anything for performance, or reliability. Several have commented that they "look nice".

 

I have pulleys and polished underhood components..

 

True, not much.. But my Greddy pulleys are half (If not less) the weight of the stock pulleys.. And same goes for the unorthodox main pulley.. They look nice, but far from the reason I got 'em.

 

Really? Tell that to my buddy who dynoed his car. (Complete unorthodox set 4 pulley set I believe) I will call him to make sure, but he made either 15 or 16 rwhp with the pulley change alone. ~360 rwhp car.

 

https://www.rx7club.com/showthread.php?s=&threadid=191685&highlight=pulley +set+dyno

 

Jason says "I did about 6 years ago. I think it was 15 RWHP from adding the main pulley."

That doesn't sound very concrete to me. It was 6 years prior and he thinks it was 15 hp? I don't think you can claim victory with that.

As for anyone else I'm not calling them a liar but I have yet to see anyone correct their horsepower figures after dyno runs. As enyone knows you make more power when the air outside is cooler and denser. I can show 15 hp increase on my bone stock Mazda reman just by doing a pull in August and another in January.

 

I can't believe that some people here, get their facts from the FAST & FURIOUS.
Yes, "I need 2 bottles of Nitrous....the BIG ONES".

For God's sake, it is the same principle as the flywheel!!!!
These little pulleys don't even compare to the weight change that a lighten flywheel can give you, yet a flywheel gives you NO INCREASE RWHP. It only makes your engine spin easier by not having to fight so much mass inertia.
If the pulley can give you an increase of 15-20 RWHP, we should be able to reproduced it to some extent on well tuned cars under similar environment conditions.
What I'm saying is, that least everyone should notice an increase in RWHP and we don't.
Sorry, it's all hype.
One person claiming this increase with or without hard data(dyno before and aft) is no proof to me.
I have the pulleys and noticed nothing on my butt dyno.
I will admit the "look good factor" can give you 15-20 RWHP.
Damon, we should pack and sell winter air on BIG BOTTLES.

 

That right, except for the RWHP part

If the engine spins easier, it will turn the driveshaft easier.....etc etc.... which will turn the wheels easier. That means more RWHP. It's not more engine HP, but it does show up at the wheels. Basically, less HP is lost turning everything after the engine.

It's the same principal as lighter rotors. They turn more easily, so the engine puts out more power.

 

I stand corrected, it should read engine HP.

 

I'm still gonna get them cause they're pretty.

Seriously- do a search before changing the main drive pulley. Removing the bolt without maintaining pressure/tension on the eccentric shaft will allow the spacers/thrust washer on the other side of the front cover to move and be out of alignment. When you re-assemble the bolt and pulley you will probably not get the thrust washer back in place and it will self destruct and spew metal filings throughout your oil and internals. Then you can assemble the pulley correctly when you rebuild your engine.
Ron A.

 

Agreed.

It's nice and easy with the motor out... Just lay it down on the clutch.

 

wait.... explain again how i can screw up.... cause if its possible i probally will hehehe

 

the bearing will fall out of place if not done right. Then will not act like a bearing

parasitic losses are reduced - technically u don't increase hp u just free it up.

Flywheel is a bit different in that there is nothing opposing it. This is why no hp is gained b/c none is lost there due to the parasitic loss.

 

can you use greddy pulley 2 pcs kit with the air pump? I mean just get a larger belt?