Throttle body

Been trying to research on the benefits of a larger throttle (TB) body but kept getting mixed answers. Some say the idea makes sense but won't work since the computer won't compensate for more air, or rather run lean. Some say it works. I also read that it helps if you have a turbo or SC. There are conversion kits to fit a 5.7 L tundra TB on the 3rd gen v6. Idk, better throttle response would be nice. Don't know how to achieve it. I have a MT and delay is very noticeable. Thoughts?

 

I have an MT also.. don't have any "delay"?? Try a K&N filter aka TRD air filter, see if that helps.

I have a TRD performance intake (includes the TRD/K&N filter) with Magnaflow exhaust and I'm pretty happy with performance... I'd do those before a TB upgrade...

I bet the TB upgrade is pricey! Where did you find it... linky??

 

TRD filters and K&N filters are not the same. K&N filters, though improving airflow like the TRD filters, have been known to not filter dust well. Just throwing this out there for clarification purposes. Two different filters for sure. I would recommend the TRD filter over the K&N filter.

 

I thought the TRD filter was made by K&N...hmmm I looked at mine .... it does say TRD an no where does it say K&N on it... interesting... whom do you think manufactures the TRD filter??

 

I've heard rumors it may be afe but honestly, it could be any company. TRD/Toyota provides specs and the company builds it. So, even if it were afe or K&N (highly doubt it's K&N), it's still exclusively designed/produced to TRD/Toyota specifications.

 

OP, what delay are you referring to, exactly... please describe in detail. methinks we are not all on the same page regarding what you're trying to accomplish. but I'm interested..

 

TB is waste of money for non highly modified engines....

Intakes don't do much either. You won't be able to feel a difference unless you lie to yourself. Its all about sound.

 

TB will be better if done with a cold air intake, the two kinda go hand in hand.

 

I'm trying to understand how a larger TB would help... the opening going into the intake manifold is the size of the OEM TB so how could a larger TB help any? We would need an adapter plate to go from larger diameter new TB into existing intake manifold.. so again where would we get any gain...the original opening isn't changing... I would think a larger intake manifold would be key and then to take advantage we need new ECU programing for fuel to air mix adjustment.... which ain't happening.

Maybe Lexus has a different intake manifold & TB for this engine??

 

Do you have the part number for the trd air filter by any chance? I can't seem to find it.

 

I believe its this number PTR03-34140

https://parts.conicellitoyotaofcons.../toyota-trd-performance-air-filter-ptr0334140

 

It will only gain headaches.

Toyota designed the stock throttle body to provide maximum power and air flow with the stock heads/intake manifold/intake/TB.

Replacing intake and or drop in filter will only gain a few cfm's so won't add that much in performance gain.


So if your wanting to replace the TB because its limiting the air flow then the next step is the valve train in limiting the TB.


What our motors are lacking is a good tune.......

 

I think it is a combo of engine tuning, gearing and shift mapping

 

Idk how to explain it.
St.Germain I know the pedal commander helps somewhat, but you still feel like something is being held back. I'll post later when I figure out a better explanation.

 

In many applications the TB diameter is not always an exact match for the inner diameter of the intake manifold. If that is indeed the case with our motor a matched TB will gave a small increase in the air flow into the engine. But an the case of a naturally aspirated engine the improvement would probably be in the 1-2% range.

 

My butt dyno won't even feel that.... no extra sounds ... no go..

 

i cant see a TB helping you with performance on these engines. im not an expert but i believe the delay would be in the programming or in the throttle drive by wire programming. intakes and throttle bodies normally do not do to much unless you have tuning software with it. and there isnt any tuner out for these ecu's if im correct.

a lot of intakes that require no tune normally do not make significant hp difference.


iv seen larger intakes put on 03-04 cobras with stock engines and actually loose power. there is a point where too big of a throttle body can have a loss of hp and tq.

i would assume it would be kind of similar as having a stock 4 or 6 cyl car and putting a huge 3 inch exhaust on it. 99.9 percent of the time it will hurt performance.

i cant see anyone with these engines needing a TB but i could be wrong. i would think tuning, exhaust, air filter and then internal engine work would be done first before a larger TB would be needed.

im sure there are people on this form who could explain it better

 

so, you're referring to the delay of the power coming on? this is my question, if you were having a proper throttle response delay or if your throttle responds but there's no power until 3500 or whatever. anyway, i think i understand and i agree. i also have the pedal commander, which helps tremendously and has given me enough to enjoy driving my truck, but the engine badly needs a tune.

 

Larger throttle body won't do jack on a stock engine. Even with full breathers (intake, TB, manifold, headers, exhaust) you'd need a tune.

These trucks do have a pretty lazy DBW throttle program though.

 

basically, but in another thread you mention that it the Pedal commander didn't solve everything. Its kind of like you're trying to rev match, and go to blip the pedal but sometimes you have to actually press and hold the gas to get the RPMs to go up. The truck is capable of having a fast response, i know because it allows you to, sometimes. It seems like its the ecu (fuel efficiency) that's holding it back. Know what I mean?
A good test that I came up with is:while driving or moving, press the clutch down all the way rev the engine multiple times. Think of what you would do if you were trying show off the sound of your exhaust in a parking lot lol.