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Throttle Body Auto vs Manual (with turbo)

 
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Old 15 Mar 2019, 08:57 am
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Default Throttle Body Auto vs Manual (with turbo)

I have seen some posts about this but really still don't know for sure what the true answer is. Years ago I had a manual (non turbo) pt and changed out the throttle body with an auto one and noticed a big difference in throttle response. I am wanting to do the same with my 07 GT manual, but want to know if my throttle body is bottle-necked or not since it is a turbo. If it is, I want to change it out..just don't want to mess with it if they are the same size.
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Old 17 Mar 2019, 03:02 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

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Originally Posted by shelbyzman View Post
I have seen some posts about this but really still don't know for sure what the true answer is. Years ago I had a manual (non turbo) pt and changed out the throttle body with an auto one and noticed a big difference in throttle response. I am wanting to do the same with my 07 GT manual, but want to know if my throttle body is bottle-necked or not since it is a turbo. If it is, I want to change it out..just don't want to mess with it if they are the same size.
Never heard of that before. The bottle neck of your engine will be your PCM. Having a modified tune is the most cost effective and realistic performance modification. Keep everything else stock and in good running order.
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Old 17 Mar 2019, 07:11 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

From what I have read, the throttle bodies on the manuals were tapered so it would be easier (smoother) for poeple taking off with the stick shift.
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Old 17 Mar 2019, 11:08 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

I read that too. As far as I can tell, it is either BS or NA only. When I pulled an extra intake for my '03 GT, I took the throttle body too since it was basically a throw in. It was from an automatic and identical to the one on my manual trans car, they both had the same size stamped on them. 57 IIRC. I think I read there was some kind of plastic piece which could easily be removed.
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Old 18 Mar 2019, 03:14 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

I know that the non turbo 5 speed I had did have the throttle body that was tapered on one side. I may take mine off my 07 GT and measure to see if they put one on it like that as well. Doesn't cost me anything to check
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Old 18 Mar 2019, 03:39 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

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Originally Posted by shelbyzman View Post
From what I have read, the throttle bodies on the manuals were tapered so it would be easier (smoother) for poeple taking off with the stick shift.
The cam on the throttle arm where the cable rides on is different manual vs automatic. Did the swap on my 98 NEON R?T 2.0 DOCH from manual to auto TB and what a difference. Was larger diameter also… no neck down in size.
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Old 18 Mar 2019, 03:43 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

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Originally Posted by My02RedRide View Post
The cam on the throttle arm where the cable rides on is different manual vs automatic. Did the swap on my 98 NEON R?T 2.0 DOCH from manual to auto TB and what a difference. Was larger diameter also… no neck down in size.
Are you sure this is true of the turbo PT? I have noticed no difference in my driving experience in the two years since I changed mine. I know the diameter is the same. I have no idea about the cam, but it all looks the same to me.
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Old 18 Mar 2019, 04:18 pm
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Default Re: Throttle Body Auto vs Manual (with turbo)

The throttle plate without the tip/in flow wedge will improve the top end performance. I doubt to much else would change at lower engines speeds.

The tip/in flow wedge reduces the total air flow rate at the starting of the intake system during manual shifting.
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Old 19 Mar 2019, 09:48 am
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Default Re: Throttle Body Auto vs Manual (with turbo)

They all, manual and automatic seem to have the same size throttle flap at 52mm. However, there are other differences. As well as the plastic "tip in wedge" most manual cars came with, they also had a reduced diameter inlet. The manual inlet is reduced to about 46mm, whereas the automatic does not have a reduced inlet at all and is ~52mm in and out.

I posted a picture a couple of years ago here of the reduced, 46mm inlet from my 03 manual GT. I am sure it is still visible if you search for it.
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Old 19 Mar 2019, 11:52 am
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Default Re: Throttle Body Auto vs Manual (with turbo)

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They all, manual and automatic seem to have the same size throttle flap at 52mm. However, there are other differences. As well as the plastic "tip in wedge" most manual cars came with, they also had a reduced diameter inlet. The manual inlet is reduced to about 46mm, whereas the automatic does not have a reduced inlet at all and is ~52mm in and out.

I posted a picture a couple of years ago here of the reduced, 46mm inlet from my 03 manual GT. I am sure it is still visible if you search for it.
I will have to look for that picture. I guess they were both stamped 52, but I held them up to each other and they sure seemed identical. I didn't use calipers, but it wasn't anything noticeable. I am sure that my manual trans throttle body was from a 2003 GT, but I don't know where the auto one came from other than that it was an auto trans car in the yard with an aluminum turbo manifold.
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