is it bad to install a 78mm bbk throttle plennum? - Mustang Evolution

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Old 05-23-2013, 03:42 PM   #1
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is it bad to install a 78mm bbk throttle plennum?

I heard its not good to install that one cuz its too big of a size
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Old 05-23-2013, 03:46 PM   #2
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Not bad, just not necessary to have that big unless you're going forced induction
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Old 05-23-2013, 03:48 PM   #3
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Not bad, just not necessary to have that big unless you're going forced induction
So wat do you think is a good size to upgrade?
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Old 05-23-2013, 03:50 PM   #4
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Might not even need one, what mods do you already have?
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Old 05-23-2013, 03:59 PM   #5
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Might not even need one, what mods do you already have?
Intake kit,underdrive pulleys,bbk shorty tuned headers,o/r x pipe,flowmasters,poly motor mounts
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Old 05-23-2013, 04:12 PM   #6
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Intake kit,underdrive pulleys,bbk shorty tuned headers,o/r x pipe,flowmasters,poly motor mounts
Go 70mm if your not doing forced induction
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Old 05-23-2013, 04:20 PM   #7
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Go 70mm if your not doing forced induction
Ok then ill look for some hopefully cheaper than the 78mm. Ha
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Old 05-23-2013, 04:24 PM   #8
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Ok then ill look for some hopefully cheaper than the 78mm. Ha
The 78mm will still be good, just no beneficial difference between the two since you won't be taking in as much air flow
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Old 05-23-2013, 04:31 PM   #9
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The 78mm will still be good, just no beneficial difference between the two since you won't be taking in as much air flow
Are you trying to say.like in away that extra air is not going to be used
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Old 05-23-2013, 04:34 PM   #10
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Are you trying to say.like in away that extra air is not going to be used
Pretty much.

---------- Post added at 05:34 PM ---------- Previous post was at 05:33 PM ----------

That extra size isnt going to pull anymore air in because it cant unless something like f/i allows more
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Old 05-23-2013, 04:56 PM   #11
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Originally Posted by MidnightBlueGT View Post

Pretty much.

---------- Post added at 05:34 PM ---------- Previous post was at 05:33 PM ----------

That extra size isnt going to pull anymore air in because it cant unless something like f/i allows more
I get ya but wat if i get it dyno tuned,you think they can tell that computer to suck more naw huh
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Old 05-23-2013, 05:01 PM   #12
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I get ya but wat if i get it dyno tuned,you think they can tell that computer to suck more naw huh
Where will it get that power from? The tb only allows the air flow in.
A tune will get the max benefits out of any mod, but only a power adder will allow more air flow into that big a tb.
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Old 05-23-2013, 05:09 PM   #13
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Where will it get that power from? The tb only allows the air flow in.
A tune will get the max benefits out of any mod, but only a power adder will allow more air flow into that big a tb.
True well then ima go with a 70 mm n a tuner n also dyno tuned n hopefully get good gains
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Old 05-23-2013, 05:14 PM   #14
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Its still a good tb, just not necessary. A pro to getting the 78 is it's a nice one to already have if you ever want to go f/i
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Old 05-23-2013, 05:24 PM   #15
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Its still a good tb, just not necessary. A pro to getting the 78 is it's a nice one to already have if you ever want to go f/i
N might just give horrible mpg huh
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Old 05-23-2013, 05:31 PM   #16
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N might just give horrible mpg huh
Not necessarily, more air=more fuel and if that little bit isnt even sucking in that extra amount of air it won't be using extra fuel either.
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Old 05-23-2013, 05:40 PM   #17
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Not necessarily, more air=more fuel and if that little bit isnt even sucking in that extra amount of air it won't be using extra fuel either.
True true ,you think turbo or s/c f/i could mest with emissions?
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Old 05-23-2013, 05:45 PM   #18
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True true ,you think turbo or s/c f/i could mest with emissions?
Not really. S/c are belt driven, turbos are more efficient and recycle the exhaust gases to create boost.
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Old 05-23-2013, 05:51 PM   #19
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Not really. S/c are belt driven, turbos are more efficient and recycle the exhaust gases to create boost.
That's true turbo exhaust comes.out cleaner huh yeah cuz i wanted to t/c my car but im tripping about Californias emissions... so hopefully as long as you have cats your good
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Old 05-23-2013, 06:07 PM   #20
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That's true turbo exhaust comes.out cleaner huh yeah cuz i wanted to t/c my car but im tripping about Californias emissions... so hopefully as long as you have cats your good
Yeah emissions vary from state to state. I love turbo builds. I might do mine if i don't slap a blower on
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Old 05-23-2013, 06:21 PM   #21
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Yeah emissions vary from state to state. I love turbo builds. I might do mine if i don't slap a blower on
Yeah me too i was looking at buying ebay kits that are cheap n replacing the turbo cuz thats the one that gives up the first cuz idk they just cheap but idk
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Old 05-23-2013, 11:08 PM   #22
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I get ya but wat if i get it dyno tuned,you think they can tell that computer to suck more naw huh
The motor when N/A sucks the air in. @70mm it's sucking in the max amount of air it can. 78mm will still be sucking in the same amount of air (but with a wistle . ) it won't hurt to go with it. I use it. I will be installing a s/c this summer though. I got mine "incase" I ever went s/c

---------- Post added at 12:08 AM ---------- Previous post was at 12:07 AM ----------

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N might just give horrible mpg huh
NO! I get 26 mpg on a nice slow highway cruise. 15 in the city goofing off
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Old 05-23-2013, 11:24 PM   #23
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The motor when N/A sucks the air in. @70mm it's sucking in the max amount of air it can. 78mm will still be sucking in the same amount of air (but with a wistle . ) it won't hurt to go with it. I use it. I will be installing a s/c this summer though. I got mine "incase" I ever went s/c

---------- Post added at 12:08 AM ---------- Previous post was at 12:07 AM ----------



NO! I get 26 mpg on a nice slow highway cruise. 15 in the city goofing off
So no point of installing a throttle plenumm?? Have you dyno your car to see if it does gain hp or just stays the same
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Old 05-24-2013, 12:02 AM   #24
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So no point of installing a throttle plenumm?? Have you dyno your car to see if it does gain hp or just stays the same
Itll gain like 12
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Old 05-24-2013, 12:08 AM   #25
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Itll gain like 12
That's alot
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Old 05-24-2013, 01:36 AM   #26
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So no point of installing a throttle plenumm?? Have you dyno your car to see if it does gain hp or just stays the same
Let me correct that....78mm tb/p will flow same as a 70mm tb/p the plenum will allow for better air flow. No mod will give you what they claim. I'm around 260rear wheels with cai, 78mm Bbk, prochamber and Mac cat back
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Old 05-24-2013, 01:45 AM   #27
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So is it still a good idea to get 78mm bbk as far as hp gains or just leave it how it is if im not planning on f/i anytime soon
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Old 05-24-2013, 02:43 AM   #28
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So is it still a good idea to get 78mm bbk as far as hp gains or just leave it how it is if im not planning on f/i anytime soon
If you even think you may go fi in the future get the 78mm, if not get a 70mm with a plenum
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Old 05-24-2013, 11:17 AM   #29
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So is it still a good idea to get 78mm bbk as far as hp gains or just leave it how it is if im not planning on f/i anytime soon
As everybody else said the 78mm BBK setup is great for going FI, what everybody has failed to mention is it's pointless to go above 70mm because you start to lose air velocity. Go check out CliffyKs beginners guide to bolt-ons in the stickies section, it has a good read on the difference in air flow with the different throttlebody and plenum combos.
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Old 05-24-2013, 11:29 AM   #30
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As everybody else said the 78mm BBK setup is great for going FI, what everybody has failed to mention is it's pointless to go above 70mm because you start to lose air velocity. Go check out CliffyKs beginners guide to bolt-ons in the stickies section, it has a good read on the difference in air flow with the different throttlebody and plenum combos.
Ok kool thanks ill check it out
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Old 05-24-2013, 11:34 AM   #31
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I have the BBK unit on my car and I like it a good bit. Didn't make a drastic difference honestly, a bit of pull up top. No affect on drivability.
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Old 05-24-2013, 05:13 PM   #32
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I have the BBK unit on my car and I like it a good bit. Didn't make a drastic difference honestly, a bit of pull up top. No affect on drivability.
I think after wat i heard in this post i don't want it now..lol
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Old 05-24-2013, 06:38 PM   #33
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I think after wat i heard in this post i don't want it now..lol
I didn't have to pay for mine. I wouldn't buy one at retail.. no TB is going to impress you, though
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Old 05-24-2013, 06:49 PM   #34
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I didn't have to pay for mine. I wouldn't buy one at retail.. no TB is going to impress you, though
Yeah ill spend the motor on something better like cams or something
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Old 05-24-2013, 09:43 PM   #35
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Yeah ill spend the motor on something better like cams or something
Smart way to go. I recommend gears.
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