Craig Richmond Posted September 22, 2013 Report Share Posted September 22, 2013 Hello! I am about to start tuning a new engine running on a G4+ Storm. This is my first time with Link, and I have some questions around dealing with throttle tip-in with ITBs. The standalone systems I've used in the past supported some blended MAP and  Alpha-N maps to help optimize tuning with multiple throttles, and I curious to see how PC Link handles this.  ITBs are notoriously difficult to get decent part throttle and tip-in performance working properly, so I thought I'd check in here first to see if anyone had any advice to share. Thanks for your time! Engine specs: 2.0L 16V 4 cylinder, naturally aspirated. 276 cams 11.5:1 compression 42MM throttle bodies Sequential injection & coil-on-plug MAP sensor fed from a vacuum manifold off of each throttle Quote Link to comment Share on other sites More sharing options...
Adamw Posted September 23, 2013 Report Share Posted September 23, 2013 I have done quite a few NA/ITB race engines and always use TPS only for the load.  I cant see even a well 'dampened' vacuum manifold giving you a useful signal for a MAP or blended load. The blended MAP/TPS strategies are useful for boosted engines with ITB's but not needed in your case. I connect the MAP sensor to the airbox only to compensate for any aerodynamic pressurisation. I have never had any issues with transient response with this type of setup. One thing I will mention is that with TPS based load you must setup your load axis with fine increments/resolution at low TP. So I normally my load axis would be something like: 0%, 2% 5% 7% 10% 15% 25% 40% 60% 80% 100% Then after initial tuning if there were any big changes in two adjacent rows then I might insert another load row.  Quote Link to comment Share on other sites More sharing options...
Craig Richmond Posted September 24, 2013 Author Report Share Posted September 24, 2013 Adam, thanks so much for responding!  The load axis you propose certainly makes very good sense with ITBs as they are so often effectively wide open by 40%. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.