My ABS box required shifting to the side a bit. The clutch mastercylinder is over my downpipe but I have heaps of insulation around it and I haven't had a problem.

 

You would think that the Throttle body be your first restriction instead of the manifold.

 

Oh ok that's good to know. I may also get a friend of mine to make me a heatshield when I find out which kit I'm going with.

 

You might think that if you had no idea what you were talking about.

 

 

Maybe read the thread first..

 

There is a significant difference between sucking thru a TB and blowing thru it.

 

Let me know fi we can help you in any way


Fernando @ Kings Performance

 

There is a significant difference between sucking thru a TB and blowing thru it.
[/quote]


This IS true it's why I say don't bother with intake manifold mods/changes etc. HOWEVER, there's still some gains to be had and in Bigfoot's defense, it actually probably is a restricted part, I'm figuring this by the piping size of it with the obstruction of the butterfly valve in the middle. Though I think the gains would be marginal at best I would expect SOME gains but only in hp numbers around 500whp+.

As you all know flow through piping exponentially looses efficiency with speed. Somewhere around mach .4 the air turbulence begins to degrade at a highly exponential rate. With that said somewhere in the ball park of around 700CFM things are going to start past that point. That's roughly...oh idk 500whp or so when figuring a 52/lb turbo or so. Thus where I get my estimate. So perhaps consider it if you're well beyond that range.

I can provide the exact formulas for these calculations if you guys request but I'm doing em rough in my head for the moment.

 

I was being a bit of a smartass (nothing new here) with my reply to Bigfoot's post but have since wondered if maybe I don't get the joke.

I thought this thread was about hot side manifolds, log vs. tubular, and whether there is ever an argument for the log design, even if it's just as a low cost entry level (Stage1) component.

In my time playing with S2000 FI I have not seen any advantage in mucking about with the cold side. I currently run the stock intake manifold and a slightly enlarged throttle body, but not because it is advantageous, just because after installing it and finding no advantage, there seemed no pint in changing it back.

At the end of the day my argument boils down to this: It doesn't matter how large your throttle body is if you are running a shitty log manifold.