Throttle Body

Crew02 · Post by **Crew02** » Fri Apr 08, 2005 4:24 pm

Has anyone looked into replacing the stock throttle body with an aftermarket?

gocntry · Post by **gocntry** » Sat Apr 09, 2005 5:01 am

Here's A Company That Does One

CFM TECHNOLOGIES

killian96ss · Post by **killian96ss** » Mon Apr 11, 2005 8:21 am

That's cool that they now port TB's also.

I have their high flow throttle blade and it made a big difference. I wonder how much they port the stock TB? They do not say on their site what mm the stock TB is, or what the ported mm size is?

Steve

coreylubahn · Post by **coreylubahn** » Mon Apr 11, 2005 10:07 am

Is all this to simply get even more air into the engine? I assume that doing something like this will give you more power but I would also assume decrease gas mileage, but is the decrease overall or only under hard acceleration? Anyone know?

killian96ss · Post by **killian96ss** » Mon Apr 11, 2005 12:22 pm

coreylubahn wrote:Is all this to simply get even more air into the engine? I assume that doing something like this will give you more power but I would also assume decrease gas mileage, but is the decrease overall or only under hard acceleration? Anyone know?

A larger TB will give you more hp, but usually only on the top end. Low speed response will sometimes suffer unless you use a more agressive cam and heads. I can't say for sue what will happen to gas mileage, but I would bet it would drop a little. Another thing worth pointing out is 4L60E transmissions use vacuum to help control shifting. Unless you reprogram the computer for less vacuum you can damage your tranny. I have seen some F-Body, and B-Body guys change from their stock dual 48mm TB to a 52mm TB without programming and their tranmissions suffered damage as a result. Larger is not always better, for example the 350 LT1 in my SS has a 48mm TB, and so does the GM Ram Jet 502. They didn't use a larger TB because the torque curve on that monster is better with the 48mm.

Steve