tps or map

[daniel carter]

hello i have a sub. 2.2 no turbo with a link g1. my question is when i put it on tps it starts with row 100 , but when its on map it starts on row 200 why is that . i'm pulling my hair out here. help this hank pls. Daniel

[Phil Williams]

A likely reason that it starts in row 200 is due to the fact that when its starting its not pulling infinite vacuum, where a throttle position sensor can go to 0% if this makes any sense?

Regards,

Phil

[daniel carter]

so should i tune in tps or map . It's a stock motor Daniel

[Jurgen Biggelaar]

Hi Daniel.

It is usually the prefered method to tune across MAP, however TPS can be used if you have very unstable idle due to individual throttle bodies and turbulent air flow. 

If you have just a single intake then I would be using MAP, as it represents the LOAD more accurately than a TPS position allowing for the correct AFR to be more easily met under any LOAD conditions.

If you were to tune 40% TPS @ 4000RPM to give you 14.5AFR cool.  But what happens when you are in a different gear with 40% TPS @ 4000RPM.  The MAP LOAD is much different. 

The new G4 systems allow you have your whole ECU map tuned against MAP, and then to switch over to TPS at lower RPM for those tricky individual throttle bodies.  Quite a nice feature.

I hope this explains the reasons well enough.  Good luck with the tune.

 

Jurgen