throttle body spacers, do they work? really?
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New User
Joined: Nov 2008
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throttle body spacers, do they work? really?
Hi, thinking about putting in a throttle body spacer on my '05 F250, 5.4 Crew. It's got 83000 km on it and I'm getting ok performance now with an avg of 16 mpg hwy. As I commute to work about 120 kms a day, I was going to put in a K&N CAI system and thinking about the throttle body spacer. Any suggestions or opinion?
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I tried one with my 02, K&N CIA and other mods. It was not worth the cost of the part. I lost some mileage (1 or 2 tenths), it made the intake whistle, and I noticed no performance increase. They work to a tiny degree and if I felt like grinding the threads off so it was a smooth transition I'd try it again. The idea of more volume behind the TB, is in theory good. The crazy "Vortex" idea isn't doing it for me. It may gain velocity on the edges of the air path, but the center has a reduced velocity. Now if they could tune the vortex to dump air directly into the intake runners then they would be worth a try.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I hope you don't mean a Granatelli or other fooled MAF? A scientifically calibrated MAF might net you a tiny bit, but from all of my reading, MAFs should be replaced only if you peg them during use.
