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Discussion Starter #1
So I have read up a bit on larger throttle bodies and I have read generally positive remarks. While the more exaggerated power estimates go into the low 20's in terms of HP/TQ, it seems the general consensus is low teens, with the same going for TQ.

What I can't seem to comes to a conclusion with is a brand, among a few other things. I know CNC, Arrington, BBK and a few others make TBs for the HEMI engines and the only concerning parts I've read is sporadic bad reviews for issues with the BBK unit.

Anyone have any experience with any of these?

What issues can I come across with the use of any of these TB's?

Tuning required or is it REALLY a bolt-on mod?

What is the best size (85, 87 or 90)?
 

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So I have read up a bit on larger throttle bodies and I have read generally positive remarks. While the more exaggerated power estimates go into the low 20's in terms of HP/TQ, it seems the general consensus is low teens, with the same going for TQ.

What I can't seem to comes to a conclusion with is a brand, among a few other things. I know CNC, Arrington, BBK and a few others make TBs for the HEMI engines and the only concerning parts I've read is sporadic bad reviews for issues with the BBK unit.

Anyone have any experience with any of these?

What issues can I come across with the use of any of these TB's?

Tuning required or is it REALLY a bolt-on mod?

What is the best size (85, 87 or 90)?
First thing you'll have to make sure is that it's not a ported unit and that it's a true "XXmm" sized unit.

I can guarantee you won't see any real gains without a-some motor mods and b-yes some tuning. More air=need for more fuel.

IIRC this is a mostly unnecessary mod unless you're running other things like a ported manifold, heads, aggressive cam, etc.
 

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So I have read up a bit on larger throttle bodies and I have read generally positive remarks. While the more exaggerated power estimates go into the low 20's in terms of HP/TQ, it seems the general consensus is low teens, with the same going for TQ.

What I can't seem to comes to a conclusion with is a brand, among a few other things. I know CNC, Arrington, BBK and a few others make TBs for the HEMI engines and the only concerning parts I've read is sporadic bad reviews for issues with the BBK unit.

Anyone have any experience with any of these?

What issues can I come across with the use of any of these TB's?

Tuning required or is it REALLY a bolt-on mod?

What is the best size (85, 87 or 90)?
Seeing your signature, it seems like a bigger Throttle Body would be a great upgrade for your current set up. If I were you, I'd go 90mm. You've already got a lot of great things going for you, tune, intake, exhaust, ect.
 

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(CFM x .069) x 10 = hp throttle body can support

An 80 mm throttle body flows 900 cfm. This is at normal air pressure. This number of course raises if you increase the air pressure thru a charge. That number is also from someone's bench testing. I'm sure if you Google it you will find varying numbers, some higher, some lower. Is a larger throttle body needed? Not for the hemi unless you are going FI. Will you feel some improvements? Probably as a more crisp response to throttle down. Do you need a tune for one? Highly unlikely, the car will adapt just fine on it's own.
 

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Like said, unless you go FI, aggressive cam, heads..... you may notice a difference in throttle response but no serious hp gains with just minor bolt-ons. I got a 87 MM TB a few months after I got the Daytona thinking it was going to give me the 10-15 rwhp gains advertised. Dyno results before and after did not show any gains for my ride.:surprise:
 

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If you look at the performance 101 thread in the "how do I do everything" topic, there is a section that shows how a larger TB will help you and under what circumstances it does you no good.

Most of the time, the stock TB flows more than what you need until 6200 rpms if you factor in the IAT sensor as a blockage. The section concluded that the only time you should upgrade your TB is for serious mods such as FI or if you port your intake or install a 6.4 intake.


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With a stock TB that can handle 900 CFM on an engine that pulls only 600 CFM at WOT, a larger TB is a waste of money.

It will take a helluva lot of mods to ever get to the point where the stock TB becomes restrictive and a larger one adds any value at all.
 
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I had a Arrington 90 on my r/t didn't really make a difference in power but the throttle response was a night and day difference.
 

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Discussion Starter #9
I had a Arrington 90 on my r/t didn't really make a difference in power but the throttle response was a night and day difference.
And I honestly wouldn't mind paying the $3-400 to liven up the throttle response. These cars need a nice shot of adrenaline when it comes to that.

Did you have to tune or anything? Or was it as simple as just unbolt, replace, bolt back up?
 

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You can liven up the throttle response by using the Diablo tuner and adding throttle boost for the same cost and get a lot more total capability for the price. The ability to tune will result in some real horsepower power beyond the better throttle response.
 

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You can liven up the throttle response by using the Diablo tuner and adding throttle boost for the same cost and get a lot more total capability for the price. The ability to tune will result in some real horsepower power beyond the better throttle response.
^^^^^^X2 a throttle body for a stock R/T or SRT is a nice paper weight, unless you plan on doing more later. Go with the tuner you won't be sorry.
 

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Larger TB's and their HP claims make for larger wallets to those who are selling them. Don't the stock 5.7L, 6.1L and the 6.4L Throttle Bodies come stock at 80mm? All three? How much more air are you going to get into the intake manifold if the manifold opening itself is around 80mm? You can port the 6.1L and make it larger but on the 5.7L or 6.4L it is not that easy and very expensive. Last I saw was over $350 for the 6.4L porting. Someone on the Challenger forum measured the 6.4L intake opening and it came in at 81mm. (If his measurements were correct)

IMHO, IF there was a gain to be made by going to a larger TB, the Dodge engineers would have done so on the 6.1L and also the 6.4L. But they left it at 80mm if I am correct, because the dang thing is not the restriction. The restriction I believe is in the opening of the intake manifold itself where the TB bolts on.

If more throttle boost is needed than what the Diablo tuner can provide, you can get a custom tune and ask that the setting be increased. I have been told that they can put into the custom tune a fixed value that allows you to be able to use the tuner to get higher than 20% if needed.:beerchug:
 
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