I'm putting together parts to put a KB 2.1 blower on a new 347 build in my 1990 bronco.

The truck is locked down at the mechanics for the weekend and it's been there for several months and I've forgotten a few things about it but I need to find some info.

First, can someone tell me if the 1990 Broncos and/or F150's used a serpentine belt system or not?

Secondly, I need to know the stock crankshaft pulley diameter measured across at the top of the ribs, (assuming it is a serpentine belt system).

If it's not, what's the best way to convert it over to a serpentine belt system? What conversion system to use, Explorer 5.0, aftermarket, or what?

Any advise is apreciated.

 

If it has 4-5 ribs...Its a serpentine setup...

 

LOL, Yeah, I know.

I just can't get to it right now to look at it and I'm trying to finalize a deal on some parts.

 

I'm almost positive all fuel-injected trucks had serpentine belts...

 

Just an update, I went by and measured it today. For general knowledge, it's got a 6.5" 6 rib serpentine pulley.

 

Nope. My 86 was V belt EFI.

6 rib belts..

 

That's a 7th gen. I didn't consider that one. Should all be serpentine after '87 then.

 

so you converting to mass air and going to get a dyno tune or are you using a megasquirt or tweecer?

 

It's already converted to mass air. One little quirk is I installed the Mass Air conversion when the truck still had a manual, and shortly after the conversion I switched to an auto tranny and it never really idled right with the auto, but from what I've learned the puter will still work once it is reprogrammed.

I'm still undecided about what tune to go with. The PMS or a custom tune seems like the best option since I really don't have the time or the desire to totally learn the different programs like on the Moates QH or Tweecer. The SCT 4 also looks ok so long as I can get it preprogrammed.

In other words, I'm pretty new to the tuning options game and am open to suggestions.

 

what auto are you running and what efi system? is it out of a mustang for instance?

 

It has a Motorsport conversion. I'm pretty sure that kit used the same mass air computer that they put in the Mustangs, an A9L if I'm not mistaking.