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Thread: The art of quad throttles

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Posts: 1-10 of 11
2010-01-05 08:08:13
#1
The art of quad throttles
I'm looking for links or information on how to calculate the requirements for Quad throttle body's.

I have a set of 45mm's off a black top 4AGE that i want to adapt onto a sr16 manifold / head but im not sure about positioning and measurements. I am limited a little by clearance between the head and the firewall

1) How close should the throttle plate be to the valve / port? Is shorter better?

2) How long do the trumpets need to be?

3) Are sock filters the better option or should i build an air box and panel filter arrangement?

I'm not looking for exact measurements as i realize it will be a little hit and miss.
What has worked for others?

What head specs / cam specs / other engine parameters need to be taken into account?

Cy
2010-01-05 09:15:30
#2
I am pretty sure the 45mm ITB's would be too small on a 2.0 VE. For a 1.6 you may be okay.

3) Sock filters really limit the power and negate the effort of going ITB in the first place.
2010-01-06 05:00:58
#3
One local sr20ve with big cams and 4age quads, Held power to 9K but what it made at 9K my stock intake n1 20ve made at 7800rpm
2010-01-06 05:39:20
#4
^^^ was he using the black top 45mm ones or silver top 40mm ? any pics?
2010-01-06 05:45:28
#5
45mm ones No pics, User posted up a thread on my forum details and video here

NeoVVL Forums :: View topic - My N14 with SR20VE Race car

Got the details from my tuner because he tuned the car
2010-01-06 07:27:28
#6
Rather try and source some M3 or 330i BMW ITB's. 50mm.
2010-01-07 05:28:24
#7
I find it hard to believe that 4 x 45mm throttle body's could be restrictive compared to 1 x 70 mm one.... Phil at Kelfords reckoned 45's were ideal when i was asking him about them.
2010-01-07 09:46:28
#8
Remember that the cylinders aren't drawing air through that single throttle body simultaneously. Also of note is that the cross-sectional area of a 45mm TB is 0.00636m2, and the area of a 70mm TB is 0.01539m2 - which is approx. 2.4 times the area of the 45mm TB.



PS: Hello!
2010-01-07 10:58:07
#9
Originally Posted by more_fasterer
Remember that the cylinders aren't drawing air through that single throttle body simultaneously. Also of note is that the cross-sectional area of a 45mm TB is 0.00636m2, and the area of a 70mm TB is 0.01539m2 - which is approx. 2.4 times the area of the 45mm TB.



PS: Hello!


****ing exactly!

42-45 is fine for these motors.

BTCC only ran 46mm tapered throttles.
2010-01-11 06:44:01
#10
Originally Posted by P10
I find it hard to believe that 4 x 45mm throttle body's could be restrictive compared to 1 x 70 mm one.... Phil at Kelfords reckoned 45's were ideal when i was asking him about them.


what power are u lookin to make and for what?
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