Getting the most from your AT Power throttle bodies comes down to a few choices - throttle size, inlet length and linkage. Here's how each one shapes power and torque, so you can tune your setup to your engine and how you drive.
Choosing your throttle size
Throttle bore is matched to your engine's power. As a starting point (based on 100mm extensions and 40mm ram pipes):
Guideline figures only - engine specification, rev range and application all play a part. Send us your engine details and we'll recommend the right size.
Extension & ram pipe tuning
Inlet length - your extension (runner) plus ram pipe (trumpet) - moves where the engine makes its power. Shorter inlets favour top-end peak power; longer inlets build low-end torque.
Short inlet
Higher peak power, with less bottom-end torque.
- Long-track
- Circuit racing
Unsure on length? Start here - it gives you the baseline to tune from.
Medium inlet
An even spread of more power and more torque across the range.
- Track days
- Rallycross
- Street racing
Long inlet
Higher torque in the lower rev range, with less peak power.
- Rally
- Hill climb
- Drifting
- Time attack
Not sure which length?Our Tuning Ring lets you test an extended inlet length for power and torque before you commit to a set.
You can order additional sets of extensions and ram pipes to make one setup versatile across different events - and finish them in any of our anodised colours.
Know your throttle
The main parts, the options for each, and the different names they go by - including the terms our US customers use.
Guidance only - the right combination depends on your engine, targets and how you use the car. Our team can spec a setup with you.
