Throttle body 70mm to 76mm Thoughts?

Anyone on here have some first hand knowledge about the 76mm throttle body conversion and how it performs with the Supercharger?

 

Nobody on here is running a 76mm throttle body?

 

no doubt it will move more air

to quantify = dyno work

 

I think I saw you had one @Athlaos @TodayWasTHeDaY ?.....

I would like to hear thoughts as well

 

On second gens the throttle body causes faster throttle body response. How much airflow increases is debatable as our Superchargers have a bottleneck from the throttle body to the rotors that cannot really be ported out to increase the diameter.

Idle is more Erratic (especially for manual trans) but there is a screw that is covered in epoxy that can be adjusted Ccw about a turn and idle improves. Just have to chip the epoxy off.

I think it's a worthwhile mod and don't regret it.

For third gens I don't know enough. The supercharger probably doesn't have the bottleneck ours does so better gains may be possible. You will get faster throttle response. Is there an adaptor available or will the throttle body bolt up? Is the 76 plug and play? Increased air piping from filter may be needed as well to maximize gains (not sure on third gen) and tuning will be needed to maintain proper AFR.

For third gens is stock size 70mm? As @ROAD DOG said earlier, absolute gains would need a dyno to prove. I think there are gains to be had though.

 

Thank you for that info. I noticed URD had an adapter plate to fit the 76mm TB and I wasn't sure if it was something people had done or another snake oil product.

This is the one that I saw: https://urdusa.com/urd-throttle-body-adapter-76mm-for-2016-tacoma-with-3-5l-v6/

 

Well the adaptor plate is available and the TB sounds plug and play. You might be the one to pioneer/guinea pig it and document your findings!

Maybe Gadget (URD dude) has tried it out and you can pick his brain although he may be obviously biased.

 

This gives me the idea to do dyno before and after with the stock versus 76mm throttle, since I still have the original throttle sitting on my shelf. And relatively cheap access to a dyno.

I would say I have no idea how much difference the bigger throttle makes to my setup. Like @TodayWasTHeDaY said, the supercharger looks so restrictive on the inlet pipe post-throttle that a larger throttle might be negated by that. But, every little bit helps, +5 horsepower here, +3 horsepower there... it all adds up in the end. Totally ricer math, but I'm sticking to the idea.

 

Ricer math!

Love it!

 

+4hp is +4hp

interesting mod anyways. You say it’s plug and play, so the 76 is from another Toyota....?

 

You have to buy the adaptor and on the URD site it will tell you what throttle bodies are compatible (different for 2nd and 3rd gen). The TB will be plug and play.

 

from their site:
"It fits the 2016 and later Tacoma with the 3.5L V6 engine and allows you to move from the stock 70mm throttle and upgrade it to the 76mm throttle valve found on the later dual VVTi engines found in the 2005+ 2UZ-FE 4.7L V8 and 2007+ 3UR-FE 5.7L V8"

 

Some rough math tells me that the 76mm TB is 118% of the stock 70mm

 

Was reading the 2nd gens go from 65mm to 76mm with the upgrade so we get a bigger step change than 3rd gens

I was thinking one would see amplified gains if forced induction is installed, if NA then maybe it’s not very noticeable

 

Bigger step change doesn't really apply. 2nd gen SC bottlenecks at the inlet where the throttle body joins up and goes through piping to the rotors. Not sure the diameter but it's definitely closer to 70mm than 76mm.

No idea how the 3rd gen SC is sized post throttle body.

 

Finally getting around to this, the supercharged trucks will very likely benefit from the 76mm unit. The supercharger intake necks down to accept the 70mm unit... the 76mm looks like a great option. Ideally, we'll want to match the opening via machining. Pics soon.

 

Pics would be great, ball end mill work for removing/blending the step?

 

Depends on what the machine shop will charge to do a one time. I've had good results in the past with the rotary tool and then hitting it with a Flex Hone. We might have to produce a small ring to fill in where the o-ring gasket seats. Same process to run an 80mm on my Tundra Supercharger.

 

I built a small CNC mill that I hack away on in my garage.

 

quite a few of the S/C folks have picked up the 76 and port matched it themselves. I have been debating it myself. eventually, ill prob does it. For 3rd gens, if possible id prob do it since there are not a ton of upgrades yet. Free-flowing Exhaust will be clutch.