I just did the open element conv. mod on my 91 RS 305 TBI and it actually felt slower. I drilled a hole in my new lower cleaner assem. for the IAT sensor and replaced it like it was on the factory unit and I plumbed the valve cover hose in it also. The car sounds alot louder but it actually feels slower. I forgot to disc. the battery like in the tech articles, but would that really make a diff.

 

I'd say it might be in your head. You're going to be sucking in more air now, but it will be warmer air too.

So, the gain is minimal.

 

if you went from the stock air cleaner assembly to open element it helped i garuntee it. even if the air is warmer its ALOT more. It should have helped...helped mine alot even in the summer. Still using the open element just not on a TBI

 

plus your also probly getten a little bit better fuel mileage.

 

TBI305 what is that setup in the pic above. And where did you get it? Part # ?

 

Thats a 3'' k&n open element (part#???)
Holley street dominator intake #300-70
and a holley 670cfm street avenger #0-80670 ( i think)

BTW no way is that setup gonna fit underneath the hood

reason i decided on the street dominator intake is because it has an idle to 7200rpm range...cant go wrong there. Its at least 2 inches taller than my old edelbrock TBI intake and looks like a really nice manifold.

 

The slower feel could be due to intake of warmer air. I've been hearing more and more about this lately, that cold air is better than warm, even if it has to be piped in from some remote location. Yesterday I came across a site that talks about various intake upgrades, including cold air intakes. Goto this link and in the sentence below the first paragraph is a link to some calculations that explain why cold air is better than warm.

http://www.performanceprobe.com/upgrades/intake.htm