Throttle Blade drilling to accomodate Hot Cam
04-12-2002, 09:40 AM
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Throttle Blade drilling to accomodate Hot Cam Pardon my ignorance, but could someone explain the who, what and why's for drilling the throttle blade after a Hot Cam install. Thanks.
04-12-2002, 10:51 AM
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Re: Throttle Blade drilling to accomodate Hot Cam Your car will barely want to idle after the install with the small stock hole. I had to use a freaking 1/4 bit to get mine perfect.
That cam likes big holes. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> LOL
That cam likes big holes. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> LOL
04-12-2002, 10:56 AM
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Re: Throttle Blade drilling to accomodate Hot Cam do it to get your IAC counts down to normal. the pcm opens the IAC a lot further to keep the motor running @ idle if you don't drill the TB (helps idle surging.) so, get your car @ operating temps, check your IAC counts& adjust until they're about 30-35 counts. car will idle much better & less surging.
04-12-2002, 01:19 PM
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Re: Throttle Blade drilling to accomodate Hot Cam IAC= Idle Air Control
My 6spd '98 needed NOTHING done for it to idle.
Can't say about the other year manual cars. . .
But the manuals are less likely to need the TB blade drilled than the A4.
Mike
My 6spd '98 needed NOTHING done for it to idle.
Can't say about the other year manual cars. . .
But the manuals are less likely to need the TB blade drilled than the A4.
Mike
04-12-2002, 01:40 PM
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Re: Throttle Blade drilling to accomodate Hot Cam After the installation, I would recommend monitoring the IAC counts using Autotap. If they're high then you can enlarge the throttle body hole in 1/64" or 1/32" dia. increments (good idea to do a PCM reset too). Then drive it a bit and see where the IAC's settle. Repeat this procedure until you get an acceptable idle.
I ended up having to enlarge mine to 15/64" (2000SS) and I idle right around 800-825rpm without AC on.
<small>[ April 12, 2002, 01:44 PM: Message edited by: Fulton 1 ]</small>
I ended up having to enlarge mine to 15/64" (2000SS) and I idle right around 800-825rpm without AC on.
<small>[ April 12, 2002, 01:44 PM: Message edited by: Fulton 1 ]</small>
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04-13-2002, 12:06 AM
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Re: Throttle Blade drilling to accomodate Hot Cam O.K., I am trying to follow this. What does IAC stand for. A scan tool such as autotap can read these numbers?
