A sort of survey regarding Throttle body modifications

[Bert Poliakoff]

I am thinking of modifying throttle bodies by opening them up 2mm, and of course providing a new machined flapper, to provide more airflow. Cost will probably be about $130-$135 plus return shipping. Thoughts? Don?

Please chime in with comments.

 

[Bert Poliakoff]

Whoops hit return

 

[sfdon]

From memory the early throttle bodies were larger than later throttle bodies. The later throttle body was rated at 106% efficiency versus less than 100% for the early body. A German BMW engineer tried to explain it to me in bad English and I never understood it. He kept yelling Bernoulli ! at me. I can measure them when I get home- I’m in Texas hanging out with Peter C, going on the annual Terry Sather run and hitting the vintage races with Drew.

 

[frogisland]

Had a modified one on a Porsche, also on the 3.5 that was originally in my e9. Both improved responsiveness. The bar had been ground/machined down also.