72-74mm Throttle body
Joined: Oct 2000
Posts: 9,033
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From: South of the pier, Huntington Beach, CA
Originally Posted by PatS4P,Jan 6 2008, 12:46 PM
Doing some investigating. Did a search in the forum @ Evans-tuning.com (throttle body). Jeff Evans stated he has tuned more than a few 500+hp cars on stock TB.
My head will be utilizing stock ports and valve sizes. So if I can't flow more CFM @
a certain PSI where's the benefit to me. Going from stock to 70mm 10-12hp gain,
possibility of smoother driveability suggests a 70mm might be better suited for my
application.
My head will be utilizing stock ports and valve sizes. So if I can't flow more CFM @
a certain PSI where's the benefit to me. Going from stock to 70mm 10-12hp gain,
possibility of smoother driveability suggests a 70mm might be better suited for my
application.
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Joined: May 2006
Posts: 7,659
Likes: 3
From: Braselton, GA
Originally Posted by Sideways,Jan 5 2008, 08:36 PM
The factory throttle position sensor is what is used.
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Joined: Feb 2007
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From: Lincoln, NE
Originally Posted by ChefJ,Jan 6 2008, 04:19 PM
Ours is riveted into the stock tb is there anyway of bolting it to the new tb without damage??
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Joined: Jul 2001
Posts: 8,754
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From: Anaheim, Orange County
I have been using a 74mm TB for a couple of years. My original one had the same piece on the butterfly crack in half as it did on Spoolin's.
The main issue I have come across with TBs of this size is related to the actual decreased sensitivity range of throttle pedal travel. Based off TPS % on the AEM, I am at 80% throttle with in the first 2.5" of throttle stroke. The pedal is therefore more sensitive. I actually prefer it, but as noted by others it does make the car a bit more touchy. Personally, the response is worth it and like anything, you will get used to it.
It's the transition back in to a bone stock street car that allows you to really notice the nuances.
The main issue I have come across with TBs of this size is related to the actual decreased sensitivity range of throttle pedal travel. Based off TPS % on the AEM, I am at 80% throttle with in the first 2.5" of throttle stroke. The pedal is therefore more sensitive. I actually prefer it, but as noted by others it does make the car a bit more touchy. Personally, the response is worth it and like anything, you will get used to it.
It's the transition back in to a bone stock street car that allows you to really notice the nuances.
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