Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

Reason for IAP fuel maps on ITB motorcycle engine?

General Tuning Discussion

Forum Posts



Tech Articles

Discuss all things tuning in this section. News, products, problems and results. 

= Resolved threads


Hi everybody! My question is about Individual Throttle Bodies (ITB) bike tuning. Usually on ITB setting there is Alpna N fuel map which is main. But also there is IAP*RPM map. I've heard it's used usually for bottom end tuning or below some TPS % opening. But how about different loads at let's say 100% TPS? Are they used? Or about 20 % TPS? Please,share your ideas!

Hello, IAP fuel maps compare Intake manifold vs atmospheric pressure and for part throttle normally up to 10-15% depending on the bike and then they switch to TPS based fueling.

TPS is just looking at throttle position and RPM and injecting a specific pulse. so in basic,

They can be used anywhere and compensate as a 4d map that overlays the tps map. generally only used in vacuum areas below 15 percent throttle or in boost as boost increases to trim or add fuel, i tune in Tps first then when I'm happy I use it for fine-tuning, I have a dyno that can hold in steady-state so this becomes an easy exercise to complete, road tuning this is very very slow,

Regards Ross

Thank you Ross!Very detailed answer! A few more questions:

1. Do you use load for TPS bike tuning or just for IAP low openings?

2. Do you tune fuel at one (5th or what?) gear?

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?