Looking to upgrade my throttle body to a bigger size. I was hoping someone Would know what size the stock TB is? That way I can make a final decision on getting one or not. The after market one I have seen is a 80mm trying to figure If it's worth getting
Thanks

 

Waste of yer time and money - the stock TB already handily outflows the needs of the engine.

Completely worthless - NO gains.

Just Curious - what were you hoping to acheive?

 

The extra HP they claim I'll get and better response. Already got the exhaust and CAI. Figured this would be the next best upgrade. I've heard they really do make a difference but idk anyone with one. Do you know the stock size though?

 

Your best mod would be a custom tune. I think the stock TB is a 65 and that is way more than enough unless you are supper charged.

 

Marketing BS - sorry to say.

HP & throttle response? From what? As I stated, the STOCK TB oversupplies already , hence anything larger will make NO diference until you go forced induction.

Exhuast? - Bupkis fer gains.

CAI? - I hope you have custom calibrations with a corrected MAF TF - or yer risking lean conditions (slot-style MAF relocation). And even so, true gains are very marginal - 5-8 hp @ high rpms only. Never even notice. More marketing BS.

The only mod that Will result in tangible gains for a resonable cost is a custom-tuned programmer ( e.g. www.vmptuning.com )

I suggest you strap on a chair and do some research.

BTW - The stocker is ~69mm IIRC (5.4L).

I see you asked here: http://www.f150forum.com/f38/09-f150...y-size-125039/ with no luck ... typical fer that site

*EDIT* - have a look at this: http://www.ford-trucks.com/forums/11...wer-chart.html

 

Ya f150forum isn't good for answers. The CAI I got is a k&n should I buy an aftermarket MAF to keep from going lean?
If the TB is only 69 then maybe it isn't worth it. I'm sure it'd sound good though and that's a plus for me but not for 300$
Thanks!

 

No problem buddy. We're here to help folks save their hard-earned $$$, just so they can spend it on other stuff

The only way to determine if a lean condition exists is direct measurement with a wideband. But - it's a near-cetainty that the CAI is not optimal with the stock calibration.

The only solution, if one is found to exist, is (a) put the stock intake back on, or (b) custom tuning (or a canned tune with the correct MAF TF -MAF Transfer Function- for that specific intake written into the tune file).

Good luck!

 

An aftermarket MAF is not the answer. You need a tuner!

 

OP - MGD and BlueJay are right. You should take there recommendations as they are both highly respected, and very knowledgeable.

 

Going on what i've read, custom tuners(that actually do something beside make you run rich) for the 300 are few and far between.. what tuners are you talking about?

 

Custom tuning from:

www.vmptuning.com
www.troyerperformance.com
www.gopowerhungry.com

SCT devices (and in the last case, SCT and Gryphon).

 

With regards to “Chips” and “Tuners”, years ago it was the best that most could do to enhance the ignition timing, fuel curve, transmission shift points, etc. It was (and still is) very important that a person verifies that the “Tuner” is ASE certified in both ECM and Transmission programming and IMHO be have current certification by the OEM whose vehicle you want to modify. There are plenty of persons who advertise their programs to be the best and even offer custom tunes, but in all reality, very few actually have credentials in these areas- but that’s not to say that some of these “geniuses” haven’t really caused damage to a few vehicles- just jump over to flatratetech.com and read just some of the comments from the MSE techs!. Perhaps what is equally important is the parameters that can be adjusted are set by the OEM vehicle software…so there is really no “magic” in what they are doing anyway. Now about this new marketing hype that if you have a CAI you need a custom program………….hogwash!!!!!! The OEM software system is designed to adjust the fuel mixture up to 10%.......that’s more than enough to handle fuel mixture adjustments up to 7,000 foot elevation change! (for high elevations 8,000+ there are oem software programs for those specific applications) The 5.4 V8 for example if close to stock can only suck in a maximum of 480 cfm and a flat panel filter will flow 500 cfm, there is simply no way any CAI on a relatively stock engine can increase the air flow enough to exceed the ECM’s ability to adjust and maintain the correct fuel mixture. The only reason for the “custom” program to support the CAI is because the design is poor resulting in false readings from the air intake sensors, etc….period! If you look at the dyno charts from many of these supposed HP/TQ increases, they are typically around 5%-7% at peak rpm ranges…….guess what, 5% is a standard deviation even amoungst mfg dynos and the most important item is……these “expert tuners” (at least most) do not have or choose not to test their results (in comparison to the oem intakes) during actual vehicle motion (or simulation- such as a wind tunnel) as the oems do. What many view as an issue (is the plastic intake tube with its noise canceling design) actually increases air pressure. It is the same hydraulic concept used by fire fighters creating water supply where psi is low. By having the air cross the path at a 90 degree angle, the pressure is increased proportionally. Fire fighters use what is called a “4-way valve” or “Blake Valve” at the hydrant where the water is cycled through the fire engine (pump) and sent back into the valve crossing the water flow at a 90 degree angle. In this case it also acts as a sound canceling device! At low speeds, this can reduce the flow a tad (which is what most “feel”), but in terms of peak hp/tq, a good high flow filter is all that is needed.

Recently, Testand Corporation conducted an ISO standards test on automotive air filters which can be viewed at this link: http://www.dieselbombers.com/chevrol...r-testing.html. All I can say is this explains in detail the reason for

(Arlen) SPICER wrote,

“Now that I am not doing the tests and my objectivity is not necessary, let me explain my motivation. The reason I started this crusade was that I was seeing people spend a lot of money on aftermarket filters based on the word of a salesperson or based on the misleading, incomplete or outright deceiving information printed on boxes and in sales literature"

IMHO, if you live near any major city there are excellent tuning specialists with dynos who for the same price (if not less) will tune your vehicle taking into consideration your specific needs including environmental conditions, for your specific vehicle. IMHO, the best bang for the buck!

If you are comfortable and understand how to tune a vehicle, you can also do this yourself. There are several software programs available, that “Speak Common English” that will allow you to tune your vehicles ECM. One company is HP Tuners, they have a website….they offer two core programs, one for those who are doing dyno tuning and one for the home-garage mechanic (which is priced at about the same as most of the “canned tunes on the market) …this version limits the span of adjustments as a safeguard against doing something outside of the oem scope……basically, keeps you from doing something “too stupid by accident” (grin).

 

You need a new pitch - this one is getting kinda old, don't ya think?

You lose credibility at the point you prove yer not conversant concerning the (slot-style) MAF and how this crucial primary sampling sensor is affected by intake geometry changes - for which the PCM cannot correct for in Open Loop fueling, as it works from a hard-coded table, specific to the intake. And for which fuel trims cannot be guaranteed to correct for in Closed Loop.

Google 'MAF transfer function' - then you can take yer 'argument' to folks like member 'Windsor' (SCT Advantage user) who has actually written them - tell HIM it's 'hogwash' and he's wasting his time Good luck with that LMAO !!!' He's an end-user, not a tuning vendor, so no vested interest in fooling folks.

Then - when yer done with him, go peddle this position of yours to folks like Diablo who apparently have also wasted their time providing specific MAF TF support in their tunes. Then on to Superchips, SCT, PHP ....oh boy!

More (and Suzook is another Advantage user): https://www.f150online.com/forums/4796511-post5.html