M45 unit on a 93 with PS no AC

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Ok I bought a used JRSC kit off of ebay.
It seemed a little odd because I thought the newer units came with the plastic crossover tub and the powercard setup, but only came with the plastic crossover tube, but it is not a power card unit.
I also got a DDM intake with it.
So other than that its an OEM M45 for PS no AC 1.6 cars.
I tried doing some cross referencing on this site to figure out what belt to get rather than having to always order from online. Id rather be able to go down to the local Advance Auto or Autozone to pick up a belt when they break.
Can any of you guys give some advice?
Also what are the thoughts of the units without powercard? Retarding the timing etc......I have never messed with timing on any cars.....ive done my fair share of work (installed numerous JRSC's on Hondas), but never touched timing ever.....

You will need SOME sort of fueling device otherwise I'd guess you would run LEAN under boost.  When I installed my sc I measuresed the lenth of belt I'd need -with a string running around the pulleys the way the belt would run, took that measurment to a local auto parts store and got the belt (it actually took 2 trips the first one was a little short).


Originally Posted by Rescuedude1728@hotmail.co
You will need SOME sort of fueling device otherwise I'd guess you would run LEAN under boost.  When I installed my sc I measuresed the lenth of belt I'd need -with a string running around the pulleys the way the belt would run, took that measurment to a local auto parts store and got the belt (it actually took 2 trips the first one was a little short).

It does have the FMU......I was just curious how could the actual powercard would have been.

The 9.5:1 compression on 90-93 cars requires ~4 degrees to be taken out. Those who don't want to do that buy a Jamp;S or a Boost Timing Retard or a MegaSquirt so they can do the timing retard electronically. Or you can buy a TrackDog intercooler and run stock timing.
The advantage of the original PowerCard over the AFPR setup was that the transition into and out of boost was cleaner and that part throttle boost (say 2-3psi) was also accurate, whereas the AFPR could be a little off of optimum when in boost but not at wide open throttle.
The advantage of the recent (last coupla years) PC-Pro based 90-93 PowerCard M45 kits is that they also supply a regular O2 sensor waveform under boost such that the computer isn't fighting the added fueling when going into and out of boost. This also reduces idle droop.
In addition, we now employ an accelerator pump function, so when tipping open the throttle and going into boost there is a shot of fuel to match the sudden shot of supercharged air going into the engine.
The disadvantage is that the 1.6 AFPR systems raise the fuel pressure, so they can handle a big boost pulley with stock 1.6 injectors. The PowerCard kits leave the fuel pressure as stock, so they are not for use with big boost kits. That said, swapping to the more accurate fueling of the 1.6 PowerCard setup, where the O2 manipulation means that the computer isn't fighting the added fueling, we added about 1/2 of the 15hp that the big boost kit add to stock AFPR 1.6 kits.
Also the better part throttle response and more accurate fueling end up raising the fuel economy slightly and the car is MUCH, MUCH better behaved when the engine is still cold. Note that 1.6 and 1.8 PowerCards (both old and new generation) are different and a 1.8 PowerCard will not work on a 1.6 car's ECU.
Feel free to CALL Moss with any PowerCard/PC-Pro questions.
Happy Boosting,
- Jason @ Moss

So Jason,
You'd say I would be better off just buying a new power card from you guys at Moss, and ditching the FMU.....correct? I would like it to be safe.

Depending on how much you are going to spend for just the PC alone, you should consider something that will let you do fuel and timing. If you are going to pickup a used bipes, or Jamp;S, you'll probably be in the territory of an MS PnP, which will give you a lot more options down the road... (injectors, etc)....
Dave,

Your engine management choice is up to you. If you want to learn to tune, then you can go Megasquirt or eManage or whatever looks like what you'd like to learn to tune with.
If you just want a kit with PowerCard, hoses and step-by-step instructions on what to leave and what to add to go from an AFPR to a PowerCard so you can install and go, then we sell a 90-93 PowerCard upgrade kit as p/n 999-284 that gets you the older PowerCard setup. If you want the latest greatest PC-Pro stuff, you would need to call Moss Tech Services to discuss what you have versus what you need (CARB, off road, etc) and we'd get you setup.
That said, an AFPR-equipped JRSC is safe. By saying quot;better behavedquot;, I mean a PowerCard equipped JRSC is more quot;seamlessquot; and OEM-like than the AFPR setup, not that one is safe and the other isn't. If your car behaves well enough for you already, then drive it and enjoy it. If you feel like an upgrade, maybe get a cat-back or some low-profile lights instead.
Best of luck with your boosted Miata,
- Jason @ Moss