quote Originally posted by Positive P: So there's a possibility of a gain when the scoop is paired with the RD inlet kit? Isn't the stock air box restrictive also, is there a replacement for it, besides just a cone filter?

Rodneys CAI kit undoubtedly will smooth out the air flow and eliminate the water separator. Back in the day when I first got into Fieros (1997) RD didn't offer this kit so we used to remove the side air grill and with the handle end of a hammer would knock out the flap of the separator within ,remove the pieces and finish off by adding a Holley side scoop. Those of us that tried this could swear that we picked up a couple of horsepower at 60 MPH and above due to the "ram air" effect. . If you think about it that side scoop is facing the front of the Fiero and is being placed into the air stream. Place your hand out the window at 60MPH and you'll feel a positive pressure on your hand. That is the same pressure that the air steam will place into your CAI system. While it is not a lot of pressure, I maintain that it will make some improvement in horsepower. A guy in my club back then who was an aeronautical engineer, did some scientific calculations and figured that the scoop and the improvemnt in the water separator would give 2-3 horsepower more but only at 60MPH and above.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
87GT - 3.4L Turbocharged engine, modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

I'm not familiar with the Duke engine or its TBI that you also changed. However, I think one lesson from the test results posted by timgray is that nobody should expect any horsepower gain from the Holley side scoop itself.


Thats what Im trying to say there was alot more to this than just
a side scoop, allot more. I will have to figure out how to post
pics so i can show everything envolved.

quote Originally posted by Oreif: While what they did exactly isn't clear, I assume they ran the car across the dyno then opened up the decklid and just removed the CIA tube off the throttle body then ran the dyno again within minutes.

The logic behind the Herb Adams' testing methodology you've assumed occurred, and which you've described immediately above, makes sense to me. Thank you for that hypothesis.

I suppose another testing option to help ensure the testing was done above reproach would have been to have kept the decklid open for both Herb Adams' tests of the Fiero's air induction system: the one with the Fiero V6's stock CAI (cold air induction) system intact, versus the one where the Fiero's air induction system was disconnected and removed from the engine's throttle body.

Either way, I wish the Herb Adams' article's author had explained exactly what they ended up doing for their testing. That hopefully would have removed any concern that hotter, under-the-decklid air might have rendered spurious their test results when the Fiero's CAI system was disconnected and removed from the throttle body. My guess is that the resultant, hotter, under-the-decklid air wasn't a confounding factor in their testing had their experiment been designed properly --- and maybe it was --- but frankly, I really can't confirm that from the way the Adams' article was written.


If someone else can confirm that, that would be great!

In the meantime, kudos again to fellow PFF member timgray for posting his own tests' results re air filters for our cars earlier in this thread.