i wouldn't consider replacing my stock 73mm throttlebody with a 74mm TB unless it was free.
nothing to be had .
any gains that would be made with a larger TB unit would likely be at the top of the power curve.
i have not been able to find any hard dyno results to prove how much power a bigger TB can make alone.
all gains i have seen from a larger TB have come after a ported upper and lower intake has been added.
and even then the TBs were in the 80-85mm range.

that pretty much says to me the stock induction is pretty much balanced and maxed out and the 73mm is enough.
the current fad atm is installing 18 and up lower intakes on 17 and down 3.6 motors looking for the HP bump.
but again theres no hard data

 

Saw something about Challenger guys having a similar argument. A company produced something with a larger TB like 10-15mm larger on the air intake side yet in funneled down to stock on the manifold. Thought was that would in theory produce zero difference. Kind of interesting the different aftermarket parts being sold often with little or no changes at all.

 

Holy wowzer on the price. Am I reading that correct?

 

Exactly! The online sale price was only like $100 cheaper, so I couldn't pull the trigger without getting more feedback and glad I did. I suppose if I ever come across a dirt cheap Amazon Warehouse deal or something, then maybe.

 

I've dynoed a lot of vehicles and this is how it is.

You will get exactly 0 hp from this. Perhaps less. It's a stock throttle body with some grooves machined on the inlet side. If you read the claim submitted to CARB for the EO, it is listed as the same diameter as stock and flowing exactly the same air as stock. Also I suspect that the increased diameter claim is from a broader cone on the inlet side where it makes no difference rather than the actual throttle plate diameter (which we have already established as stock).

People need to understand that the flow of an intakes or exhausts is 99% dependent on the greatest restriction. So if the throttle body is the greatest restriction in the system, then replacing it will increase power. If the restriction is somewhere else, like head flow, then the throttle body will make absolutely no difference to power. And if it does turn out to be a restriction, then replacing it will not increase power everywhere, it will only increase it where the flow is high enough to be a problem. That's how you can easily filter out bogus dyno graphs.

I own a dyno, have an unlocked ECU and tuning software but have never put the JK on the dyno. Why? Because what's the point of getting 5% more hp at the top end from an exhaust system and intake on a 5000 lb vehicle? Each to their own I guess, but I don't think the TB is going to get you far.

 

Thanks, I was having trouble finding how large the stock opening was, then wondered if this was more or less a stock with gooves and laser engraved logo on the inside. I've read for muscle cars that can accept the much larger throttle body that it can make some difference, but figured our JKs may not get such a benefit. Then realizing its maybe only like 1mm larger than stock surely makes no difference.

 

3.6 doesn't qualify for muscle car
even if its the right chassis.
but the 3.6 is still a motor and can be wrenched, just not cheaply...
much more has to be changed before a larger TB becomes a limiter

the largest ive seen on a challenger 3.6 was an 80mm ported out to 85mm,but it was bolted to a ported intake .
depending on that OTHER mods were made you can see a 300-340hp range at the rear wheels.
but you won't see this in a jeep because the drive train is twice as parasitic as that of a RWD chassis