Optimized/Ported stock '03+ DBW throttle body
11-15-2006, 01:08 PM
#21
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just for the record, changing a TB geometry is definately a call for a tune. You're engine is calibrated based on assumed hydro-diameters and whatnot. You just changed a lot.
11-19-2006, 04:32 PM
#22
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okay just did the porting as per your instructions on a second TB I bought. It had a strange Idle at first but then it seemed great. I took it for a drive and the Throttle response was very very veryyyy noticable. It seemed to slow down slower meaning when you took your foot off the peddle the truck just seemed to keep going and then slowly slow down with the gears. I have a Chevy SS AWD so I expect it to slow itself but it just coasted. My fuel economy went up from 16.4 to 17.0! I did find it a little unsettling to have to stomp on the brakes to slow down pulling out of the driveway at low speed/not touching the throttle. Seemed to like to roll/coast at 20mph now!
Thanks for the help.
Thanks for the help.
11-19-2006, 07:54 PM
#23
if you have hpt tuners try to lower your base running airflow. this will let the pcm know that you need less air to idle (less open tb) since you ported th tb its getting more air at the same % throttle position. lower those tables in the warmer ranges and it should stop the cruise control effect. do a small amount at a time to keep from over shooting.
11-20-2006, 09:37 AM
#24
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Barney,
That was one of the exact problems I had with my shaner ported TB on my old crew cab. I had it tuned several times and was never able to get rid of that problem.
That was one of the exact problems I had with my shaner ported TB on my old crew cab. I had it tuned several times and was never able to get rid of that problem.
11-21-2006, 01:52 PM
#27
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Okay I changed the tune and all I can say is WOW. This should have come from the factory with a polished TB. I went so far as to use up to 600 grit paper then polished with a buffing wheel and rouge. Its pretty smooth I originally wanted to chrome the houseing but dont think that will ever happen now.