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2015 Silver GT
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Ditto
wildcatgoal
@sirboom_photography
Just use the stock TB.
MustangGuy
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Why is the GT350 TB so much of a pain? Wouldn't seem like it should be such a big deal going to a slightly larger opening but I sure do read about constant problems with the GT350 TB on this forum. Haven't done any performance mods yet but this forum really helps in sorting out how to best spend my money.
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wildcatgoal
@sirboom_photography
It's actually a GM part. Has different electronics, which means you have to tune it differently than the stock TB. Doesn't mean it can't be done, just that the stock TB yields the same power (maybe shy 3-4 hp... you won't notice) and you don't have to buy a new TB.
Dominant1
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Yeah bama = no good. Fyi my gt 350 intake and tb runs perfect and thats with stage 3 cams. you dont need the stock tb just a better tuner!
stage3s4
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For whatever reason, simply coping the throttle body data from a stock GT350 calibration to a 15-17GT will not fix the driveability issues you will have when using the GT350 TB. You have to start adjusting effective area and predicated throttle tables which can be a pretty tedious process. I think this is less of an issue with other TBs because the data given will work properly. GT350 TB was designed for a totally different engine.
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markmurfie
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I believe the reason for this is the GT350 throttle body data was setup to give the requested torque value where as the GT gets the primary requested torque from a driver demand table. So its not really that the TB was designed for a totally different engine, but that engines tune was dialed in at ford using a totally different process that the Ford ECUs are capable of. Usually you want either your TB model or your driver demand describing what the maximum torque is and the other describing what the driver probably wants. of course at wide open throttle they should tell the same thing, but at partial throttle if you get both saying what the driver probably wants then you get surging as the ECU switches back and forth to which ever one is lower at the time. all a tuner has to do is raise one or the other to describe the maximum torque request and let the car use the other for the partial throttle torque request.
Silver50Pony
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Gt350 manifold and throttle body here Lund flex fuel tune and zero drivability issues , starts ,drives and cooks my Michelin pilot super sport 295 tires with no problems.
stage3s4
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We are essentially saying the same thing just in a different way. Ford designed the GT350 throttle body to work in the way you described for whatever reason (which is different from the 15-17 GT TB). Also keep in mind that its not like there is a DIY on how to get this throttle body to work properly (at least not until recently). It takes hours and hours of data logging and adjustments to find out what is happening. I have used the method described above which has provided me with the best results. Obviously, once you figured it out, doing future tunes is much easier and quicker.
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