TBI throttle body, restrictive or normal?

[mmigacz]

I for the life of me cannot remember the maximum IAC opening of a TBI. Its either 160 or 255. I used to max out the value for throttle follower and increase the decay rate considerably.

On a factory big block it is just substituted. I think some people add both for additional height. That being said you may have to grind on the back of the TBI unit for clearance for the fuel line fittings.

In tunerpro, the scaler maxes out at 255.