This dude is super animated. Love it. Play at 1.5X speed for extra fun.

He actually tested the adapter and not the throttle body. Proving the adapter does indeed restrict. Now I want to see a 92 mm TB vs. 102 mm TB on a FAST 102 manifold to see the real difference in TB power

Finally some one who cut through the BS. I worked at a mechanic shop years ago and we had a VW pickup truck. My boss installed an upgraded TB on it and the gain in HP was really noticeable

Love your videos. Incredibly helpful.

Great vid!

On a 3.8 litre Buick in our VP Commodore in Australia. I put a 65 mm TB, original was 60 mm. Took baffle out of manifold . Took it for a drive and went back to 60 mm. Took it for a drive. Did this a few times in a couple of hours just to make sure it wasn't in my head. Put the 65 mm. Oh joy!!!! Then IAT resistor mod, cai setup. Went very well that identical car with 2 young goons laughing at my VP Commodore wagon which is heavier than the sedan and full of power tools. We had a run and I was in front by half a car length up to 100 km. Cheers from Australia! Australia has worst engine rules. Eg; cold air induction is illegal in pod form!

More LSX based Speed Secrets videos please. GM CEO Mary T. Barra hates LS/LT V8'S. 😼

Good info thanks

Wouldn't the adapter still be a choke point even if running a 102mm throttle body? Wouldn't a more accurate test be to run a fast manifold with a 102mm then a smaller throttle body?

Really Great Information!!!!! :)

Great video.

I always thought this ha great video

Ty you answered my question: Looking for an Atomic airforce 103mm intake manifold and i was wondering if I should get the 103mm TB or bezel

Thanks, you just saved me about $100 for a Throttle Body Spacer .

This will answer a question I have about a build I'm doing right now. Now please ask Fast to make a L92 LSXRT for a street truck.

Bought a ls3 throttle body, 102mm what would I need to combine this with? On a lm7

Lets enlarge the port on the stocker to use the 102 MM and re-run the test.

Port polish the adapter smooth ridges create boundry layer impede flow area smaller than smooth original t body. Try test on manifold that doesnt require adapter for larger throttle body Fast manifold etc.

The adapter basically made it back to a 92 mm

good video smart man

Lol, he said THATS ALL THE TIME I HAVE as they say on real TV.

Could I run ls3 intake with 92 mm throttle body with my 6.0 with 317 heads if not which intake would u recommend for some gains ?

Just bought a bbk 95... looks like I should’ve gone with a Fast 92 lmao live and learn

Hey I have this exact motor from heads, intake, cam everything but my throttle body is a factory ls1 throttle body how much would that be robbing me?

Thanks 👍✌️🇨🇦

I wish fast stuff wasn't so expensive...

what do u feel is the best over all ls intake on market

This makes absolute sence!👍 I see there's a lot of people in the comments that have a comprehension level equal or lesser to that of a toad😂😂😂👍💡 It's like connecting a big fire hose to a garden sprinkler to TRY and get more water to flow through it, But once the high flow of water reaches the "intake" opening, the flow goes back to it's original slow flow because the holes opening size never changed😱 So to get more flow, you have to open the "intake" opening to make it bigger like the big hose👍👍👍

Biggest gains with a throttle body are made with a twin screw when on the suction side. More boost.

Sir I want to order ported throttle bottle for my c7 Grandsport pure for the Hp. So I think I skip the idea ?

What if am running a supercharger that has a 90mm throttle body and go to a 103 throttle body with an adapter? Will i have gains

What's he karate choppin lol

Well the adapter is the problem really you still limit the gains of the throttle body because the intake was maxed at 92 mm had it been larger maybe even bigger than the 102mm the difference may had been seen also I noticed the volume for the engine cam selection was medium compared basically think of the engine as a air compressor more area to fill vs a restricted area yes you might not can feel this but at the strip the right combo can achieve a better time

This is not xrated. A bigger mouth doesn’t mean a bigger throat. Thanks Richard

Engine Masters sent me

What about 90mm to 92mm any benefits?

Do you lose horsepower when they have low rpm taper? The throtle bodies? And how much?

Wonder what kind of gains I'll see on a 3.0l v6 with full exhaust, 90mm TB and a short runner intake with a 90mm bore. If it's anything like the camaro we used to drag race putting an offenhauser open plenum intake manifold dropped our 1/4 times by a second. By it self. Should see some decent gains on this high racing v6.

As I understand, you were trying to make a point that a larger throttle body does not make a big difference. After watching your video, I feel this was a waste as you have an obvious failure that really required no testing to validate (much less a video to explain). If the upper intake mating to the throttle body is only open 92mm, no matter how you bolt up the 102mm throttle body, you are destined to see zero gains because you will never over come this bottle neck. Or the gains you see are a result of the throttle body having more room to work, compensating for the throttle plate and shaft (even at that, the difference is so so minor it would be as variable as ambient temp outside the engine). Why didn't you do a video with an upper intake that could accept the 102mm throttle body and adapt the factory throttle body to show the difference between the two?

Would a TB upgrade help my Jeep SRT if it’s stock?

I follow you on your channel

Am I able to get custom cams???

can you do a vid on a 4.3 v6 vortec please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!... I really enjoy the 4.3 vortec v6 vids.... a 4.3 5.7 throttle body comparison???????

Johnny Sins of the carporn

For that engines displacement and rpm a 65mm Throttle would be fine. Most people and even factory go overboard.

HEMI motors react differently than the Chevy to throttle body upgrades perhaps because it is undersized from the factory regardless there is a gain on the low end only with HEMI motors

Also you got to bring up drivability. For someone who drag races not a big deal. Somebody who road races and needs the throttle to be very linear. you only want to put the biggest throttle body in there that will match everything else. if that's a 60mm throttle body then that's the best choice.... did you know you can make over 700 horsepower on a 54 mm restrictor.

So 546hp is obtained from a manifold, TB, and coil packs?

i’m guessing the opening has to match and not taper back down to 92

Car intakes is were the power is at all day unless you have cathedral port you can use a tbss intake but still ls6 is king

And that is why I do not believe in those 92 mm throttle body adapters that neck down to the 78 mm for the pick up intake

Thanks saved me $185.

what about twin 90mm

HP wont increase when the adapter is reducing the opening.

Wow. I fackin knew it. All these damn companies saying a 90mm bbk to will increase hp on my mustang with no tune. Just plug and play. What a scam. Now my throttle randomly sticks when I'm slowly pulling into a parking spots or in stop and go traffic.

ehh, answers but contradicts. what I see is that v8 can only gain somuch by brute force. v6 i4 can gain a better margin because itll be going from somthing like 50-60 to 90 aswell as porting exhaust

This is easy to explain and I'll use less words. Horsepower is a byproduct of Torque and Engine Speed. Think about it. The LS engine is a perfect example of the factory manifold being designed by people that know what they are doing. The LS engine just flows so well in stock form. Each cylinder head can flow up to 450cfm without the aid of the aftermarket. It's the peripherals that make the difference in these engines. The throttle body doesnt make the horsepower. Think about it this way. Why would you put on a bigger aftermarket carburetor on an engine without upping the jet size? See what I mean?

Largest factory is 95mm from the zr1

It's going to be the same because of throttle body paper down to the factory 92 opening. Try your test with twin turbos on a cross ram with two throttle bodies versus a single.

larger throttle body dont mean shit unless you get bigger fuel injectors too

This test does nothing but prove that common sense is not a myth😏. If you really wanted to prove that the gains in a fast intake/TB swap weren’t in the TB then you should be running the fast 102 intake and both TB’s.

Im going from a 75mm to a 90mm on a 6.2 truck intake with a 90mm hole. I bet l feel and get more power. Dude does great videos...just not this time

It's not the same modified engine and putting a throttle body on it then grabbing a stock engine and putting it throttle body on it

Butt dyno I’d say I lost low end torque and gained high end( 4500 rpm +). As it’s a tow rig that was not good

I need me a cam for my G8

Personally I blame squirrels

“We used an adapter..” which defeats the entire purpose of the video. Not very intelligent.

I know you are talking about GM engines, but, my experience in my Mustang 4.6 in this order: K&N intake. Not much difference. BBK throttle body 78mm. Notable difference. Ford Racing Intake Manifold. A huge difference. I can feel more power and acceleration. The combination of the three parts. One only not make a great difference.

What is wrong with you bro? The Adapter killed the test. You should have ported the factory intake or did the test for the throttle body alone on an intake that would take both. Please step up your game bro you have so much ability to do so much better FFS

So where's the video of you doing this? I'm confused? All I see is pictures and you taking about it.. exit👉

So many people have dynoed bigger numbers with a bigger tb this just doesn't make sense. You obviously port the manifold inlet to the bigger throttle body size. 30whp on a 300zx tt larger intake piping 60whp with larger intercooler. Its simple cars breath better they get more power. Your doing it all wrong. Nobody puts a bigger tb on and holds it back to stock inlet size like you just did lol.

Need to run a stock engine! Not a modified! A modified does need more air! A stock one is differemt.

This is a really dumb test. Test the two throttle bodies on a manifold with entry size properly sized for a 102 throttle body.

A bigger throttle body on a small engine isn’t better. If you have the air flow from the heads/cam/stroke combo then yea. Big gains. But putting a big throttle body on a small engine isn’t gonna make it better. The air flow restrictions are gonna need to be addressed first before you throw a huge TB on it. So moral of the story. If you have a engine big enough to need more flow. Then a bigger TB will help. But if you don’t. Then don’t waste your money.

This was kind of a waste of time it seems. Should have used a manifold with a 102mm opening - and adapt it to 92mm - instead of the opposite. Who in their right mind would buy a 102mm TB with an adapter down to 92mm and expect to get a power increase? Dumb.

This test is so wrong and here's why. Look at airflow available vs airflow demand. If the opening and throat of the manifold has a maximum cfm flow of 1,200 and the maximum cfm needed for the maximum hp out of the engine is 1,000cfm and the smaller tb flow is 1,100cfm then going to larger TV that can flow on it's own 1,300cfm will do nothing because of 2 reasons. 1 the most the manifold can flow is 1,200cfm and 2 the max air the motor can use is 1,000cfm. We flow throttle bodies, heads and manifolds everyday and this is what we see.

Somebodies drunk

Stop doing the things with your hands, and the bobbing up and down thing, yeah gotta stop that too man.

it's a good thing you cannot use your feet for gestures. I get tired looking at your hands. if you were a public speaker, you'd be covered in eggs.

It’s not the intake as a whole it’s the mouth of the I take. Home that intake mouth and see what happens