jimbone

Question: I did the airbox mod (drilled holes in airbox cover) and reportedly it gives you an extra 5 hp and it does sound great. It feels quicker to me, and I don't know if that's all in my head or not because of the sound, etc. My question is can an inexperienced butt like mine (had first p-car x 1 year, tracked once) notice a 5hp difference in street driving only? I've also read that the running the AC subtracts 5-15hp, but I really don't necessarily notice that drastic of a change. Thanks!

David in LA

its not the actual hp increase that matters most but any increase in responsiveness and torque, and where in the powerband that increase is.

Toga

honestly jimbone, I don't believe we can feel a 5HP difference, if ever those holes give such an increase. But the sound during acceleration is great!

pjc

I have the "sound package" on my 993, which is basically the same thing as drilling holes in the airbox - as far as I was aware there is no increase in HP - it was all about sound - that's why it was called the "sound package"?

PJC

CalvinC4S

I think the a/c sucks around 7hp, I heard that and don't know it to be a fact.

Marv

No. Not on your car.

However, if you were to add 5 HP to your push mower you would notice the difference!

morologous

I'll second Marv. When I turn the A/C on in my Golf TDI (around 90 horses) I can feel every hair of those five to ten horses slipping away from me. On the 993, the difference is much less noticable.

dhicks

I really dont feel a great differnece with AC on/off in my 993....maybe just a very slight sluggishness....on my 951 a different story.....it was OK when turbo spooled up but until then it was a dog with the AC on

TheOtherEric

Whoever told you that drilling holes in your airbox gives you a 5hp increase doesn't know what the heck they're talking about. It's worth about 0.01 hp. But you wouldn't likely notice 5hp increase anyway.

15hp? Yes, you'd probably feel it. Sometimes I forget to turn my A/C off at the track, but I figure it out in about 3-4 turns. That's probably about 10-15hp I guess.

Jean

You cannot feel a 5 HP difference on a 270+hp car.
As Eric said, the drilled airbox will not make any difference in performance, the sound will make you feel like it does, it is normal.
On 993TTs (particularily modded) the drilled airbox makes a substantial difference.

97Targa

GrantG

When you floor the accelerator in the 993 with the a/c on, it temporarily turns off the a/c compressor until you release the gas pedal, AFAIK...