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Old 10-27-2014, 10:12 PM   #351
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Who pays full retail? Once I get my rebate, I will have paid $280 for the BBK.
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Old 10-27-2014, 11:04 PM   #352
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Which is still ~120 bucks more than what you will end up paying with a GT tb. I would spend this extra cash on other mods, but that's just me.

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Old 10-27-2014, 11:18 PM   #353
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How about the cost for the machine work to make the GT fit properly?
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Old 10-27-2014, 11:44 PM   #354
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That ~ $150 includes price of TB ($50) + machine work ($80 to get holes milled and fins shaved off) + another $20 for a new intake coupler.

At least this is what ive paid.

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Old 10-28-2014, 04:54 AM   #355
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If you mod it right it should be better than the bbk. The 73mm tb is still smaller than the steeda intake maf and tube as well as the upper Im opening. So having eliminated choke points on the entire intake system should help. 80mm from filter to intake manifolds instead of 80mm 73mm 80mm. I will post the data logs and hopefully someone else can post bbk data logs and we can compare the values.

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---------- Post added at 03:54 AM ---------- Previous post was at 03:54 AM ----------

P.s. I paid 50$ and did the machining myself

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Old 10-28-2014, 05:38 AM   #356
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I paid just under $40 for my GT TB and will most likely do the machining myself.

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Old 10-28-2014, 06:00 AM   #357
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That's a deal. And we know it works great now. I bet someone starts making kits with this soon.

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Old 10-28-2014, 07:06 AM   #358
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That's a deal. And we know it works great now. I bet someone starts making kits with this soon.

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Maybe I missed it but what tune are you running?

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Old 10-28-2014, 07:13 AM   #359
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Was running a steeda 93 and now an mpt 93

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Old 10-28-2014, 09:45 AM   #360
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That's a deal. And we know it works great now. I bet someone starts making kits with this soon.

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YES! Someone please take the hint. Look at Lone Wolf...eh?
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Old 10-28-2014, 09:50 AM   #361
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That's my final mod. Ported upper and lower intake manifolds!!!

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Old 10-28-2014, 10:04 AM   #362
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So we just need to have adapters made, correct? Or do you have to machine the TB holes to line up? If its an adapter I could get a machinist to build a bunch at a "group order price"
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Old 10-28-2014, 10:41 AM   #363
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The adapter pushes the intake too far out and it causes fitment issues with the intake. You just machine new holes on the 80mm throttle body

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Old 10-28-2014, 10:45 AM   #364
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Was running a steeda 93 and now an mpt 93

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I wonder if I'll be ok running the Bama 93R tune. I don't have a laptop to datalog.

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Old 10-28-2014, 11:07 AM   #365
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It will be fine, worst case scenario is the throttle is twitchy.
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Old 10-28-2014, 11:15 AM   #366
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It will be a little twitchy until it's adjusted in the tune. But it's not bad and you can counter act it if you have a clutch

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Old 10-28-2014, 12:15 PM   #367
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Twitchy as in sensitive? Mine is a manual.

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Old 10-28-2014, 12:48 PM   #368
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Yeah its a little jumpy comoared to stock so you have to get used to it.

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Old 10-28-2014, 04:29 PM   #369
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I thought most people said it was smoother vs stock.

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Old 10-28-2014, 04:53 PM   #370
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Acceleration is way smoother. It's just alot more air flow so it is different than stock and you have to get used to it

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Old 10-28-2014, 09:06 PM   #371
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Gotcha.

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Old 10-31-2014, 09:22 AM   #372
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Ok its been 2 weeks now. has anyone done a before or after datalog?
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Old 10-31-2014, 09:33 AM   #373
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Data logged my 80mm last night

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Old 10-31-2014, 09:36 AM   #374
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Data logged my 80mm last night

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Did you do a Before and after? Load it into Vurtual Dyno see what pops up.
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Old 10-31-2014, 12:18 PM   #375
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Did you do a Before and after? Load it into Vurtual Dyno see what pops up.
+1 even if not into virtual dyno, I'd be interested to see other differences in the data log before and after the 80mm throttle body, for example MAF.

So, a thought that has been going through my head. Although 80 > 73 > 68 mm and therefore we should have less "restricted" flow, the velocity of the flow through the throttle body is decreasing when we increase the diameter (continuity equation). I wonder if the intake manifold was engineered to be precision-tuned to the velocity of the flow through the stock 68 mm throttle body. In other words, those who are putting large throttle bodies are actually hurting themselves.

Any one have thoughts on this idea?
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Old 10-31-2014, 12:52 PM   #376
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What year GT's have the 80 mm drive by wire TB?

Never mind - I believe I finally found the info: 2011-2014 Mustang GT's
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Old 10-31-2014, 01:15 PM   #377
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+1 even if not into virtual dyno, I'd be interested to see other differences in the data log before and after the 80mm throttle body, for example MAF.

So, a thought that has been going through my head. Although 80 > 73 > 68 mm and therefore we should have less "restricted" flow, the velocity of the flow through the throttle body is decreasing when we increase the diameter (continuity equation). I wonder if the intake manifold was engineered to be precision-tuned to the velocity of the flow through the stock 68 mm throttle body. In other words, those who are putting large throttle bodies are actually hurting themselves.

Any one have thoughts on this idea?
With the greater diameter, that means more air mass at once. I don't think velocity matters TOO much as the engine can only suck in air on the intake stroke, otherwise it's just sitting on top of the valve.

Overall a small distance. With each intake stroke, it's pulling in more air mass, so it can then use more fuel. Bigger combustion.

Just my 2 cents.

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Old 10-31-2014, 02:35 PM   #378
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With the greater diameter, that means more air mass at once. I don't think velocity matters TOO much as the engine can only suck in air on the intake stroke, otherwise it's just sitting on top of the valve.

Overall a small distance. With each intake stroke, it's pulling in more air mass, so it can then use more fuel. Bigger combustion.

Just my 2 cents.

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Sakib and Joey has raised excellent points. However, please correct me if im wrong: isn't amount of fuel added for combustion/AF mix depended on data provided by MAF sensor loacted way farther from the TB, right by the intake filter?

So like if your intake is sucking X units of air and sending it to the throttle body/intake manifold, wouldn't this data provided by MAF sensor be used to deliver amount (14:1 at idle and 12.7:1 at WOT?) Of fuel to the combustion chamber? Granted a bigger TB with deliver 'chunkier - volume wise' mass of air into the IM. Did I just answer my own question? Lol

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Old 10-31-2014, 02:41 PM   #379
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Sakib and Joey has raised excellent points. However, please correct me if im wrong: isn't amount of fuel added for combustion/AF mix depended on data provided by MAF sensor loacted way farther from the TB, right by the intake filter?

So like if your intake is sucking X units of air and sending it to the throttle body/intake manifold, wouldn't this data provided by MAF sensor be used to deliver amount (14:1 at idle and 12.7:1 at WOT?) Of fuel to the combustion chamber? Granted a bigger TB with deliver 'chunkier - volume wise' mass of air into the IM. Did I just answer my own question? Lol

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I think your asking that if its dial in to deliver X fuel for X air and instead are providing Y air that it will lean out?

Yes but at the same time it will equate to more power. It depends on the car and tuning but have a 13:1 AF ratio wont hurt you and may give you more power than a 12:1 ratio but its not important at all because we have companies like BAMA, MPT and STEEDA to do all that math mumbo jumbo for us. Just install the TB, do a data log and send it in for revision.
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Old 10-31-2014, 02:52 PM   #380
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The im is opened to 80mm with the fins removed and filed down a little so the flow matches from filter through the im at equal values

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Old 10-31-2014, 03:18 PM   #381
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With the greater diameter, that means more air mass at once. I don't think velocity matters TOO much as the engine can only suck in air on the intake stroke, otherwise it's just sitting on top of the valve.

Overall a small distance. With each intake stroke, it's pulling in more air mass, so it can then use more fuel. Bigger combustion.

Just my 2 cents.

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I understand what you are saying, Joey, but I'm not convinced. Here's why. I don't believe the air mass is simply sitting in the IM waiting to be sucked in on the intake stroke. I think (I don't know for sure, I'm just hypothesizing here) that the air is in high speed flow and there are pressure harmonics going on within the IM. My guess is that Ford engineers precision tuned the air box/throttle body/IM such that both flow mass and velocity are timed with intake to optimize how much air is getting into the cylinder. I wonder if changing the throttle body diameter will adversely affect these fluid dynamics.


We can theorize about this all day, but what would really answer the question is if one of these guys who installed the larger throttle bodies do a before and after datalog. Especially GB93, since he didn't need to do any fabrication like 14mustang did, could relatively easily remove the TB and put it back on.
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Old 10-31-2014, 03:26 PM   #382
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I might be able to find a before and after log. However, the one prior to tb installation wouldn't be too conclusive since it was short and I didn't really go WOT.

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Old 10-31-2014, 03:26 PM   #383
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Well that's where a proper tune comes into play. Obviously it can't affect the physical properties of the manifold or throttle body. But it can adjust to compensate for them.

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Old 10-31-2014, 03:31 PM   #384
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Hey guys ill do the before and after data log as soon as I can def this month before it gets too cold. Been absolutely swamped with midterms and other tests

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Old 10-31-2014, 05:17 PM   #385
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Well that's where a proper tune comes into play. Obviously it can't affect the physical properties of the manifold or throttle body. But it can adjust to compensate for them.

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I agree that a smart and knowledgeable tuner
would be able to compensate for it. That's why I'm skeptical of BAMA not tuning for Grabber's BBK. Even more complicated for 14mistang's 80mm, since that is something he did himself, so it would require a ground up analysis by the tuner.




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Hey guys ill do the before and after data log as soon as I can def this month before it gets too cold. Been absolutely swamped with midterms and other tests

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That would be awesome bro. Take your time, you're the one doing us the service by providing us with valuable data and adding knowledge to the mustang community.

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