I am looking at options for the throttle body intake pipe (elbow) I am running a Litchfield intercooler which maintains the 1.75” standard size piping but it still uses the standard OEM throttle body intake pipe. This pipe is 38mm diameter. Airtec etc do much larger ones for their big boost pipe kits. I have found a company that make ones which are larger in diameter with options for 1.75/2/2.25”. Has anyone much experience with this? It seems logical that increasing the 38mm diameter to at least that of the boost pipes would reduce the restriction here. Is Toyota being clever here using convergent and divergent ducts to accelerate the airflow and then slow it down prior to the throttle body? I have kept the standard size piping to prioritise response over all out power. The car is remapped with ECU TEK and runs the standard turbo. Currently it’s 327bhp and I hope to get up to 350. Weldspeed manifold is going on next.
GR Yaris Larger throttle body elbow
- Thread starter GJR
- Start date
The Do88 kit includes the throttle body elbow and maintains the flap size internal diameter (49mm) all the way to the intercooler.
I haven’t had mine fitted yet, but it seems reasonable to keep the diameter matched like that.
The Weldspeed manifold is quite a tight fit. Hopefully, there won’t be any issues with the elbow.
I haven’t had mine fitted yet, but it seems reasonable to keep the diameter matched like that.
The Weldspeed manifold is quite a tight fit. Hopefully, there won’t be any issues with the elbow.
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How did you find the weldspeed manifold? How did you secure the brackets that used to bolt to the OEM manifold? I have stayed away from big boost pipes because of the desired power delivery and ultimately because it’ll keep the OEM turbo and I really want to minimise lag and keep the characteristics of the car. A big turbo could go on but it would take longer to spool.
I ordered it from Australia through Goleby, as they had a clearance sale on it.
The OEM brackets had to be removed, but it’s manageable without them if you’re smart and make good use of zip ties.
I was thinking the same—aim for better charge cooling while keeping lag to a minimum. That’s why I chose the Do88 out of all the aftermarket intercoolers. It has the lowest internal volume yet the largest frontal cooling area. It’s also very precisely engineered and well surface-protected.
The OEM brackets had to be removed, but it’s manageable without them if you’re smart and make good use of zip ties.
I was thinking the same—aim for better charge cooling while keeping lag to a minimum. That’s why I chose the Do88 out of all the aftermarket intercoolers. It has the lowest internal volume yet the largest frontal cooling area. It’s also very precisely engineered and well surface-protected.
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Very similar to my thinking. This is the Litchfield one. It will be interesting to see what difference the pipes make
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Airtec have just released their inlet manifold which is a direct replacement to OEM plastic manifold.
It looks great! I'm quite curious what is the inner diameter of their runners, given that they still use the factory gasket? The Weldspeed manifold has its intake runners matched to the head ports, enlarging them to 60x30mm from the factory 58x27mm
