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R31 Pintara => R31 general tech & queries => Topic started by: bogan_bob on Apr 14, 2007, 09:17PM
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Just had a suggestion that i slap a Ka24 throttle body on my R31 skyline from a U12 pintara and hone the top plenum to match. Anyone care to shed some light on the advantages/disadvantages of such a practice?
Sounds interesting, seeing as the XF throttle body that fits pretty well supposedly does jack schit
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Just had a suggestion that i slap a Ka24 throttle body on my R31 skyline from a U12 pintara and hone the top plenum to match. Anyone care to shed some light on the advantages/disadvantages of such a practice?
Sounds interesting, seeing as the XF throttle body that fits pretty well supposedly does jack schit
ANYONE???????????????????
BB
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Is a KA24 TB larger than a standard RB30 throttle body?
The main reason to change the throttle body on a car is to get more air into the engine, so to be of an advantage the throttle would have to have a larger internal diameter.
Disadvantages: you may lose some precision if the throttle body is considerably larger.
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Yeap
Ka throttle body is bigger than the ca20 tb. Bolt holes are exactly the same tho. So, you could just enlarge the hole in ur intake plenum and slap on the tb, and increase your max airflow capacity instantly!
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Just had a suggestion that i slap a Ka24 throttle body on my R31 skyline from a U12 pintara
he wants to put it on an rb30 not a ca20 eurisko.
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Woops, my mistake!
Well, i doubt that a 3L engine will have a smaller tb than a 2.4L, but u never know. It takes 5mins to figure out. Take off ur tb and measure it. I believe the tb on a ka is 55mm.
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Will do. a couple of other blokes have done it to their r31s and swear by it but the whole smaller engine t/b onto larger engine sounds dubious to me, thought id go after second opinions. Will measure rb30 width on the weekend
thanks
BB
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yeah i heard somewhere 300zx drivers upgrade thier TB's with ka tb's...i think the ka will be bigger then the rb
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KA throttle body is definately bigger than the RB30... i was shocked also. Went to get an RB throttle thinking it would upgrade my KA, but its considerably smaller :o
I didnt even bother checking the bolt spacing afterwards so not sure if it will be strait bolt up/how close it is.
It would be a decent upgrade however. As mentioned you will loose responsiveness, but will up the power, especially higher in the rev range.
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Woops, my mistake!
It takes 5mins to figure out. Take off ur tb and measure it. I believe the tb on a ka is 55mm.
A USDM VG30E TB is 56MM interior diameter port matched to manifold. Exterior taper I believe is 60MM
A USDM KA24E/DE TB is 60mm interior diameter port matched to manifold. Exterior taper I believe is 66MM. Maximum porting to the KA24 TB is 65MM maximum porting diameter (this means use of a 65MM butterfly).
PIC of an OBD2 USDM KA24de TB 66mm taper to 60mm butterfly
(http://i27.photobucket.com/albums/c166/BigVinnie/taperTB66mm.jpg)
We never received the RB30e in the states but I am quick to assume that it uses the same TB as the VG30e engine same bolt configurations for swapping. I would like to note that VG30e engines when using the KA24 TB show gains of HP and torque across the board. I'm researching to see if I can also use the KA TB on my VG33e engine which comes in my 2003 nissan pickup truck. If you want the bolt configuration measurement and layout let me know. I have more pics.
All USDM and JDM (Manufactured in Mexico and Japan) KA TB's are 60MM/butterfly.
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Nice one buddy!! still havent got to the throttle body on the rb30, will check and report back tomorrow....