Eddie,
I have a T78 with no clearance for this, but Dan has something in the works for us as well. I'll be looking forward to seeing what he comes up with.

 

Sweet.

 

I’m hoping to make a preliminary mock up this weekend and have a prototype cut next week. My goal will be to use as many parts from the first kit to reduce prototype expense and possibly give the ones who buy the current model an upgrade path if they switch over to single.

Dan

 

Please keep us updated when you can Dan.

Eddie

 

Will do.

Dan

 

I'm pretty sure I got the bracket for the single turbo guys figured out. I'm going to try and get a prototype cut this week and will post up pictures as soon as I get it in my hands.

Dan

 

Dan

You are using the SR Motorsports wide grip pulley set. Would you go that route again??

Julian

 

When I was building my motor Pineapple was no longer making their idler pulley so I bought the SR wide grip to increase the contact patch on the water pump. I knew I had to do something, but had no other options. It didn't work as well as I had hoped so I developed my own idler.

Knowing what I know now I would have just developed my idler and saved the money of replacing my old under drive set. The thing is the water pump and alternator are such low load devices even a 4 rib belt could handle the load with a proper contact patch.

Dan

 

nm

 

no question the idler pulley is the best solution, but I can easily turn my water pump pulley by hand and it been that way for years since chucking the air pump...my water temps never get above 85 C so it's doing it's job, I think it has to be pretty loose before it starts slipping, and it seems like you would notice

 

Good stuff right here.

 

Nice write up.

 

I have figured out the bracket for the single turbo guys. I just need to source a bearing to handle the extra rpm from the smaller pulley. I'm still waiting for the prototype to be cut but the one I handmade fits perfect.

I have added a list to the group buy thread to judge interest, if I get enough onboard I will move forward with production.

Dan

 

Hi Dan,

what will be the price? You can put me down for the single turbo version.

Eddie

 

Just depends on the cost of the bearing, it has to be rated to turn almost twice as fast. Other costs should be about the same, so I think the finished cost will be slightly more.

Dan

 

I am in for the single turbo setup... let us know.
You can PM me if you can whenever its ready to go.

 

Just add your name to the group buy feeler list and I will contact. Link is in my signature.

Dan

 

I have the prototype bracket for the single turbo guys now and will post pictures as soon as I find my camera.

Basically if you have 3/4" clearance from the water pump housing on the turbo side it will work for you. The pulley will be mounted between the upper and lower radiator hoses and of course on the same plane as the water pump and main pulley.

Pulley size will be about the same as the alternator pulley. If I remember correctly the bearing will be a double sealed stainless steel ball bearing rated and 24,000 rpm between 500 to 1000lbs of load.

If you are interested, follow the link for the group buy in my signature.

Dan

 

Here are some pictures of the finished pulley kit and the new Single prototype:





New Single Turbo Prototype pulley kit:





When complete the pulley on the single turbo kit will look like the first kit but smaller. We just used the Alt pulley for test fitting.

Dan

 

The single turbo idler pulley kit is going into production, just follow the link in my signature for the group buy.

Thanks,
Dan

 

Removed the airpump and installed the Pettit kit (water pump pulley and new belt) and everything turns great. Belts are set to factory tension.

 

You might want to read this: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/aluminum-underdrive-pulleys-maintainence-item-781445/


Dan

 

i just removed my air pump last night with the pettit kit and i couldnt believe the belt barely has any contact with the water pump compared to stock set up, so i know i still shouldnt over tighten the belt but when is it tight enough to stop so this wont happen? ASAP PLEASE

 

Buy Chadwick's water pump idler pulley kit and solve the problem permanently:

https://www.rx7club.com/forum/showthread.php?t=810990

I have this on my car and it holds the belt nice and tight around the water pump without much tension on the belt at all.

 

/sidenote Ill be there, i know i dont have the reputation of Goodfellas, but im interested in meeting everyone else too :-D

So having an underdrive kit and not tightening it to the extreme would result in reduced coolant flow? more localized heat? or what