Anyone know if the smaller EATON M45 supercharger fits on the Fiero V6? Anyone tried it or is it not possible?

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Having received no answer at all; I'll assume the answer is NO!!!!!! Where is everyone? The techies have abandoned the FORUM.

Well, The way I see it, the M45 is just too small. No significant amounts of boost without spinning it to some ungodly speeds. The math is simple. The M45 charger spins at up to 14,000 RPM's, the 2.8 Spins up to 6,000 RPM's So, right there you would need 2.3:1 ratio pullies. The M45 pushes 45 Cubic inches of air per revolution witch is why its called the M45. There is also the M62, M90, M112, witch all push thoses same cubes per rev respectivly. Anyway back to the math, Ok so you have a 2.3:1 pulley ratio, and 45 cubes of air per revolution of the charger, therefore you have 103.5 Cubes of air coming out of the charger per revolution of the crank. The natural displacment of the 2.8 for each revolution is half of its actual displacment; 173, so you have 86.5 cubes naturally aspirated per rev.

Ok, 103.5 cubes coming in, 86.5 cubes of space, thats 17 cubes of boost. Put that in a proportion to atmospheric pressure, (17 / 86.5 = X / 14.7) and it all boils down to 2.9 PSI of theoretical boost. Not too impressive. actual boost could be about 5 PSI, due to restrictions but that still isn't much.
The M62 will get you about 10 psi of theoretical boost and the M90 somewhere around 20, witch is a little too much (at least with the 2.3:1 drive pulley)

Mounting is the second problem. So far, the only way an Eaton blower or any other blower (RSM comes to mind) has ever been mounted on a Fiero's 2.8 is to take the place of the AC pump, witch I know is unacceptable, well... to most. I have seen people mount the blower there, the next issue was to plum it into the intake, preferably through an intercooler too. Most eaton blowers are designed to be mounted on top of the engine either outlet up, or down. Fortnatly, Ford used the Eaton M90 on there 3.8L supercoupe's. What was so great about that was the fact that they put the blower on upsidedown on the motor so the outlet was facing up, they then used a collector looking box that had a tube leading to an intercooler, then back to the intake under the blower. This makes that particular model of the blower fairly flexable in application.

Hmm... I just had a naughty thaught about sizing up my M90 to the 2.8... 20 PSI... HMMM.

So, The issue is weather or not its even worth all the trouble of fitting the blower.
Ill see If I can dig up some thread's to point out.

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84 Indy fiero Quad 4 HO (almost done!!)
85 2m? Getting parted out soon
Silver 88 GT, Newest addiction.

The BIG problem with using any kind of roots or twin-screw blower on the 2.8 is finding and intake manifold. Fageol makes one for their 2.8 S10 supercharger kit, but I have no idea how adaptible it is to other varieties of superchargers.

Personally I wouldn't use a roots. If I were going to supercharge a 2.8, I'd use a twin-screw blower.

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'87 Fiero GT: Northstar, Getrag, TGP wheels, rear sway bar, rod end links, bushings, etc.
'90 Pontiac 6000 SE AWD: Leaking ABS unit fixed, load levelling rear suspension fixed, still slow

The biggest problem with supercharging a Fiero is location. If you locate a roots supercharger above, then you will need to make a custom manifold, fabricate an adapter for the throttle body, relocate several sensors, fabricate custom pulleys and cut the deck lid for clearance. If you go the centrifugal supercharger route, be prepared to give up the space that your A/C compressor now occupies. Considering the ease of installation,the lower cost and the fact that you won't make any less power; IMO the turbocharger is a far better solution.

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87GT 3.4 Turbo Best 0-60 5.2 seconds
http://www.turbochargerpower.com/turbo.htm