Quote:
Originally Posted by husker boxster
Nice video MP. Now we have some actual numbers vs all the butt dynos.
In some regards I'm not surprised by your results. I have an IPD on my CSS and my butt dyno didn't feel any HP advantage. I did feel some mild mid-range grunt, which your #s show. You don't mention doing any software tuning in your experiment and I don't have a tune either. I think that's why the HP #s look like they do. With no tune, you're just adding air to the equation. The fuel injectors are still performing at their previous levels. I'm not an expert and I didn't stay at a Holiday Inn, but I would think diluting the fuel / air mixture with addl air explains the loss of HP. The factory mixture Porsche chose would hopefully be the best ratio possible. With a tune, you could get the fuel side richened to match the extra air and produce a more explosive cocktale. Somebody with more knowledge than my guesses can chime in.
When my engine rebuild is complete, the shop that pulled my engine is going to do a tune and dyno pull on it to maximize the setup after a proper break in session. I'm looking fwd to that (hopefully sometime this month).
Sure don't miss the Kram days.
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As to the no tune:
You are not just adding air.
The DME/ECU adjusts the fuel/air mixture for each individual cylinder on each individual intake stroke. So at higher RPM that is hundreds of times per second.
If the car is not throwing codes for having reached it's enrichment limit then short term and learned (long term) fuel strategies are adjusting properly for the additional air supplied by the IPD.