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Intake comparison on 4AGE 20V BlackTop

What performance gain to expect when replacing the original plenum by open velocity stacks

Here's a little comparison on the Toyota AE82 Twin Cam GT from Sushi Express rally team : checking with PerfExpert the difference in torque and power between the original plenum and open velocity stacks.

To make this comparison reliable it was necessary to proceed as following :
- Always stop the car at the same mark on the road before pressing the START button,
- Always WOT at the same mark on the road,
- Perform all measurements in the same direction of travel,
- Be sure to follow the PerfExpert measurement procedures (phone calibration performed, impeccable phone mounting, weak wind, free road, lift windows...)
- If the car remained parked for a while then drive it a few minutes at medium speed to cool down the engine bay. This is to always similar engine bay temperature for all measurements, 
- For each setup (plenum or open stacks), perform at least two measurements having less than 2% deviation to confirm their reliability. Indeed non-repeatable measurements (differences of more than 2%) could reflect a poor phone fixation or poor conditions (road, wind, engine bay temperature...).

Toyota Corolla TwinCam GT AE92
1 - Dyno results with T3 open velocity stacks
4AGE 20V Blacktop with T3 open velocity stacks
Dyno result 4AGE 20V Blacktop with T3 open velocity stacks
Dyno result 4AGE 20V Blacktop with T3 open velocity stacks

Here are the results with this setup :
- 159.6hp @ 7300rpm / 131.8Ft.Lb @ 5500rpm
- 159.1hp @ 7300rpm / 133.2Ft.Lb @ 5300rpm

Dyno result 4AGE 20V Blacktop with T3 open velocity stacks

Here are the results with this setup :
- 150.4hp @ 7200rpm / 128.2Ft.Lb @ 5200rpm
- 151.3hp @ 7200rpm / 130.4Ft.Lb @ 5200rpm

Conclusion

This shows a clear advantage of open stacks in power (more than 5%), and a slight advantage in Torque. But the most interesting is to see the curves comparison :

Dyno comparison of stock intake vs open stacks on 4AGE 20V Blacktop

Note that with the plenum there is a little more torque under 5000rpm and less torque passed this rpm. So really, even if the open stacks give more torque maximum value, the plenum give a more torquey engine at low rpm.
A pity that we didn't have a 100% stock plenum (whose stacks are not cut) and the original airbox + filter. The comparison would have been even more interesting.

If you have questions, please leave a comment!

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