Twin throttle bodies

[spetz]

Is a throttle body per side of the plenum a good idea?

Also, what happens if the TB's are too big?

Stock is 60mm
I have a 65mm waiting to put on
But thinking of welding new plenum on and running twin 48mm

What are people's opinions??

[sivic]

you may get turbulence issues. who knows.
if a TB is too big you can lose intake velocity and therefore torque and power

[|N|]

i read twin throttle boobies... damn

[bennjamin]

there used to be a kit for Hyundai excels awhile back...netted decent results.
Was quite complicated and the price and results wasnt worth the effort

[fatboyz39]

i upgraded my throttle body from 40mm to 60mm. Gain 10kw atw after tuning.

[sivic]

yeah but the original 40mm would have been super restrictive so cant really apply those results across the board.
spetz - this is for the FTO mivec engine right? you could well see some gains from upgrading to 65mm, as its not really that big for a 2.0l V6.

[spetz]

Yeah it is for the FTO
Stock is 60mm
I have a 65mm already
But I am thinking of using two 48mm from the 1.5 Mirage/Lancer range, on custom plenum, shortened match ported stock runners, and get rid of the dual length intake system
THe engine is in a lancer so low end power should be fine as it's much lighter than FTO

Just wondering whether the custom effort is worth it

[spetz]

Sorry I forgot to ask
Does anyone have a calculator type thing that can calculate the total open area of two 48mm?
ie it is equal to single XXmm opening?

[bennjamin]

Sorry I forgot to ask
Does anyone have a calculator type thing that can calculate the total open area of two 48mm?
ie it is equal to single XXmm opening?

(pie/3.14XXXX)r2


where r = radius.

[e240]

Sorry I forgot to ask
Does anyone have a calculator type thing that can calculate the total open area of two 48mm?
ie it is equal to single XXmm opening?

(pi((48/2)^2))*2

where pi= 22/7

[yourfather]

Pi IS 3.14... idiot.

Ok, seeing as we're being specific, here is Pi to 3,099 places .

3.141592653589793238462643383279502884197169399375 10582097494459230781640628620899862803482534211706 79
82148086513282306647093844609550582231725359408128 48111745028410270193852110555964462294895493038196
44288109756659334461284756482337867831652712019091 45648566923460348610454326648213393607260249141273
72458700660631558817488152092096282925409171536436 78925903600113305305488204665213841469519415116094
33057270365759591953092186117381932611793105118548 07446237996274956735188575272489122793818301194912
98336733624406566430860213949463952247371907021798 60943702770539217176293176752384674818467669405132
00056812714526356082778577134275778960917363717872 14684409012249534301465495853710507922796892589235
42019956112129021960864034418159813629774771309960 51870721134999999837297804995105973173281609631859
50244594553469083026425223082533446850352619311881 71010003137838752886587533208381420617177669147303
59825349042875546873115956286388235378759375195778 18577805321712268066130019278766111959092164201989
38095257201065485863278865936153381827968230301952 03530185296899577362259941389124972177528347913151
55748572424541506959508295331168617278558890750983 81754637464939319255060400927701671139009848824012
85836160356370766010471018194295559619894676783744 94482553797747268471040475346462080466842590694912
93313677028989152104752162056966024058038150193511 25338243003558764024749647326391419927260426992279
67823547816360093417216412199245863150302861829745 55706749838505494588586926995690927210797509302955
32116534498720275596023648066549911988183479775356 63698074265425278625518184175746728909777727938000
81647060016145249192173217214772350141441973568548 16136115735255213347574184946843852332390739414333
45477624168625189835694855620992192221842725502542 56887671790494601653466804988627232791786085784383
82796797668145410095388378636095068006422512520511 73929848960841284886269456042419652850222106611863
06744278622039194945047123713786960956364371917287 46776465757396241389086583264599581339047802759009
94657640789512694683983525957098258226205224894077 26719478268482601476990902640136394437455305068203
49625245174939965143142980919065925093722169646151 57098583874105978859597729754989301617539284681382
68683868942774155991855925245953959431049972524680 84598727364469584865383673622262609912460805124388
43904512441365497627807977156914359977001296160894 41694868555848406353422072225828488648158456028506
01684273945226746767889525213852254995466672782398 64565961163548862305774564980355936345681743241125
15076069479451096596094025228879710893145669136867 22874894056010150330861792868092087476091782493858
90097149096759852613655497818931297848216829989487 22658804857564014270477555132379641451523746234364
54285844479526586782105114135473573952311342716610 21359695362314429524849371871101457654035902799344
03742007310578539062198387447808478489683321445713 86875194350643021845319104848100537061468067491927
81911979399520614196634287544406437451237181921799 98391015919561814675142691239748940907186494231961
56794520809514655022523160388193014209376213785595 66389377870830390697920773467221825625996615014215

[Mashimaro]

Ok, seeing as we're being specific, here is Pi to 3,099 places .

3.141592653589793238462643383279502884197169399375 10582097494459230781640628620899862803482534211706 79
82148086513282306647093844609550582231725359408128 48111745028410270193852110555964462294895493038196
44288109756659334461284756482337867831652712019091 45648566923460348610454326648213393607260249141273
72458700660631558817488152092096282925409171536436 78925903600113305305488204665213841469519415116094
33057270365759591953092186117381932611793105118548 07446237996274956735188575272489122793818301194912
98336733624406566430860213949463952247371907021798 60943702770539217176293176752384674818467669405132
00056812714526356082778577134275778960917363717872 14684409012249534301465495853710507922796892589235
42019956112129021960864034418159813629774771309960 51870721134999999837297804995105973173281609631859
50244594553469083026425223082533446850352619311881 71010003137838752886587533208381420617177669147303
59825349042875546873115956286388235378759375195778 18577805321712268066130019278766111959092164201989
38095257201065485863278865936153381827968230301952 03530185296899577362259941389124972177528347913151
55748572424541506959508295331168617278558890750983 81754637464939319255060400927701671139009848824012
85836160356370766010471018194295559619894676783744 94482553797747268471040475346462080466842590694912
93313677028989152104752162056966024058038150193511 25338243003558764024749647326391419927260426992279
67823547816360093417216412199245863150302861829745 55706749838505494588586926995690927210797509302955
32116534498720275596023648066549911988183479775356 63698074265425278625518184175746728909777727938000
81647060016145249192173217214772350141441973568548 16136115735255213347574184946843852332390739414333
45477624168625189835694855620992192221842725502542 56887671790494601653466804988627232791786085784383
82796797668145410095388378636095068006422512520511 73929848960841284886269456042419652850222106611863
06744278622039194945047123713786960956364371917287 46776465757396241389086583264599581339047802759009
94657640789512694683983525957098258226205224894077 26719478268482601476990902640136394437455305068203
49625245174939965143142980919065925093722169646151 57098583874105978859597729754989301617539284681382
68683868942774155991855925245953959431049972524680 84598727364469584865383673622262609912460805124388
43904512441365497627807977156914359977001296160894 41694868555848406353422072225828488648158456028506
01684273945226746767889525213852254995466672782398 64565961163548862305774564980355936345681743241125
15076069479451096596094025228879710893145669136867 22874894056010150330861792868092087476091782493858
90097149096759852613655497818931297848216829989487 22658804857564014270477555132379641451523746234364
54285844479526586782105114135473573952311342716610 21359695362314429524849371871101457654035902799344
03742007310578539062198387447808478489683321445713 86875194350643021845319104848100537061468067491927
81911979399520614196634287544406437451237181921799 98391015919561814675142691239748940907186494231961
56794520809514655022523160388193014209376213785595 66389377870830390697920773467221825625996615014215

Ok if you wnat to get technical there is no formula that has been created to find the true value of Pi there for its 3.14xxxxnonestop.

[yourfather]

www.zenwerx.com/pi.php

[spetz]

Ok because I am actually quite an idiot and I suck at maths, can someone please just give me the answer?

The total area of:
48mm
50mm
60mm
65mm
And, 2 X 48mm, is what in single? I am expecting around the 69-71mm mark?

[e240]

Lol :d

[ZeForce]

Ok because I am actually quite an idiot and I suck at maths, can someone please just give me the answer?

The total area of:
48mm
50mm
60mm
65mm
And, 2 X 48mm, is what in single? I am expecting around the 69-71mm mark?


48mm => ~1810 mm^2
50mm => ~1964 mm^2
60mm => ~2827 mm^2
65mm => ~3318 mm^2

2x 48mm => ~3620 mm^2

:wave: :wave: :wave:

[ZeForce]

Which means 2x 48mm will give you same intake area as ~68mm, but I would think they would give different results....

[spetz]

Thanks ZeForce

What would to 50mm be then? Intake area if it was single that is? 70mm ish?

I assume the twins will be better as they should distribute air between the cylinders more even?

I also assume 2 60mm is over the top?? This would be the easiest solution for me :(

[SKREMN]

having two smaller ones will create more air speed where a big one will be more sluggish
so two shoudl be more responsive
but it will need a nicely tunened manifold to suit

[spetz]

I was just going to use stock runners, on custom plenum

Stock runners of course match ported etc and cut maybe 4 cm to make them shorter?
Also they have the twin length intake system which I will be getting rid of as well