Unless you were running AutoTap or some other diagnostic tool, it's gonna be anyone's guess. You could've been getting KR. Why were you icing the composite (plastic) intake? Pulling a K&N or Holley filter typically won't show any gain at your power level because the engine is getting all of the air that it needs. IMO, 1 or 2 RWHP is not worth the chance of sucking down foreign particles. Also, I think the Baker hose is more cosmetic than anything. Be careful with it; over time it could crack your lid since the hose doesn't flex like the stock piece.

Unless you have some data from the PCM, there's no telling what was going on. I'd personally take it to the track to see if it performs the same. The dyno is meant to be a tuning tool, so take the #'s with a grain of salt. Look at the MPH from your timeslip to see what kind of real power your car is making. It will give you an idea if you're missing power.

 

I need some suggestions.

Last July (July 2001) I had my 2000 SS dyno'd on a DynoJet dynomometer, with the following results: SAE corrected 329.3 rwhp, 332.4 rwtq, air-fuel ratio average = 12.7. Yesterday, June 1, I had the car dyno-tested also using a DynoJet machine, with the following results: 318.3 rwhp (also SAE corrected), 327.0 rwtq; air-fuel ratio average = 13.

We're looking at a net SAE horsepower loss of 11 rwhp, which is more than can be attributed to the difference between two DynoJet apparatuses, I believe. The following power mods were in place for both sets of pulls: SLP LM exhaust, SLP Y-pipe, SLP stainless cold air pickup, SLP 85mm MAF, Direct-Flo airlid. The engine, MN6 transmission and real axle were in both cases filled with Red Line synthetic lubricants.

Additional mods and/or new parts in place for yesterday's dyno run were as follows: Baker hose, throttle body coolant bypass, NGK TR55 plugs gapped to .055, new MSD plug wires, and stock Corvette fuel rail covers cut to fit the Camaro engine compartment (can't see any effect there because the hood was wide open for the dyno run).

Also, for yesterday's run, the Holley Powershot air filter (in place for the July 2001 pulls) was removed entirely, and the intake manifold was cooled with ice bags for around 1-1/2 hours before the pulls. As of yesterday, the car had a little over 39,000 miles on the odometer, approximately 10,000 miles more than last July.

I was expecting a small power increase from the combination of new Baker hose, TB bypass and no air filter, rather than a power loss. Any ideas where my missing 11 horses went? (Someone suggested my cats might be solidifying, for example...)

All thoughts welcome-- thanks!
<img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

 

Did you do the EGR mod? I lost a bit of horsepower with that, because I forgot to put the O ring back on! Got a bit of a leak! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

Yeah, the best thing to do is take your car to the track and test your time and mph.