So im deleting my air pump and i will be running a dual pully kit from racing beat. Has anyone using this or anyother dual belt kit ever had any cooling issues or charging issues when in normal street use? Or maybe even a little traffic?

 

I nor my friend had any troubles from the dual alternator pulley. If thats what your talking about...

 

It will actually make ur alternator last longer.

 

i have one just remember to get the same sized belts as the water pump pulley.

 

Cool. I think this one is designged to run the standard belts. Just doubled ofcourse.

 

Any trouble keeping water temp down? It runs the pump slower than normal apparently.

 

Why are you talking about the water pump running slower? Are you planning on buying the RB main pulley? http://www.racingbeat.com/RX7-1986-1...tem/11469.html. That's something different from the dual sheave alternator pulley: http://www.racingbeat.com/RX7-1986-1...tem/11479.html

Underdrive pulleys are not great for street driving. I briefly used a 54mm Atkins dual pulley on an FD alternator, and was not pleased to find it barely charging the battery at idle. Add any additional electrical load, and it would just drain slowly. Using the stock belt may not work either; I had to test fit a bunch of larger belts until I found the right size. You'll be better off with a stock-diameter pulley around ~40mm.

 

im talking about the kit. That includes the pain and the alt double sheeve pulleys.

 

if you're planning to buy them, then i'll assume you realize that RB, themselves, caution you about the use of the underdrive main for street driving as a part of it's description.

anyway, i have used their alternator pulley since the 90s, and for what it's worth, i haven't experienced any charging issues. i also agonized over getting their main pulley for while, but i eventually decided against it because i couldn't find any user feedback on it.

 

I'm using the dual alt pulley with the rotor on the front. I've had all kinds of problems getting both belts even. No matter what, if one was right on the other was too loose or tight. I'd have one belt squeel and the other was fine. So I'd tighten it up a little and the one that was right on was now too tight. I tried moving the belts around. I tried different brands of belts. I tried making sure the belts were made at the same time (had corresponding part numbers). I then tried replacing the loose belt with one size smaller. I may go to using a Pineapple Yoohoo belt.

 

^ thats weird. The whole point in dual belts is minimise belt slip.

 

It's not that uncommon. It's difficult to find 2 belts that are exactly the same length, so one ends up tighter than the other. Just because they have the same PN, doesn't mean they're identical.

 

I have the RB Main pulley and I am using an FD alt with the J2LA pulley. Main is underdrive and alt is non-underdrive. My lights dim at idle but other then that no real problems. I am using H4 bulbs instead of the stockers.

 

try explaining that to a freaking autozone employee...... they look at you like, wtf are you talking about?

 

I had read that you're more likely to get belts of the exact same length if they were sequentially numbered. I'm having a hard time remembering the details but this is what i remember. There are sequential numbers as the belts are cut during manufacturing. Not the part # mind you. So if you have sequential numbers they were right next to each other and less likely for the length to vary as much.

A friend at a shop I've been spending time at suggest I pack some sort of filler in the looser belt pulley channel. I forget what he said he's used in the past. Once my engine is back if I"m still having the same trouble I'll be asking him.

 

LOL, yes I had exactly that experience. I asked the guy for sequentially numbered belts and he looked at me like I spoke latin. I explained to him how every belt varies a little and he tried explaining to me that every belt is measured and every part # is the same length.

 

What are the numbers to look at as far as the sequense? I know mine say n530 but as far as i know that is the part number?

 

Some old school brands still sell matching belts but if not keep tightening the one till it stretches the same. You will probably never find a exact twin pair of a common brand at a corporate store. I ahd to use stretch technique before and the alt. rebuilder we use at shop blamed rubber dust as culpruit of it failing