Tuning question/no IAT sensor

[spederman]

I had my car dyno tuned the other day. I'm confused about the way my shop/tuner has my car setup. The car was tuned without even using the IAT sensor. When i picked it up it was throwing a code for a missing IAT sensor, and then he just plugged one in and let it lay out in the engine bay, basically just to get rid of the CEL/code. Tuner said this method works well for them. So does that mean i really dont have an adaptive tune to where if its really hot or really cold, i could blow my engine because timing isnt being pulled? I'm just not too sure about this setup, because for all my mods, shouldnt i have more than just 377rwhp/374rwtq?

Power mods: Vortech S trim (3.2 pulley@9psi), Paxton intercooler, Bassani mid length headers, O/R X pipe, borla cat back, Accufab TB/Plenum, AFM powerpipe

 

[Skud]

It sounds like you're right.. The tune won't be adaptive and won't adjust to warmer/colder weather..

Riley

 

[DBMSTNG]

your tuner is a fool, take your business elsewhere.

 

[Skud]

Go ask for your money back and when they ask you why tell them that this method works well for me..

Riley

 

[spederman]

Would it make a difference with the way the system is setup? The way its setup is that the MAF is after the supercharger (blow thru) and the BOV is coming off the intercooler pipe and is vented to the atmosphere.

When i take it to a different tuner, can they just plug the IAT sensor where it belongs and re tune or do they have to re do the whole setup?

 

[Skud]

I think that the IAT always needs to measure the final air that enters the engine. This way the ECU knows the exact temperature of the intake air and can compensate for it by pulling or adding timing.

Putting the IAT in front of the S/C will make it read too cold and the ECU will add too much timing. Putting it between the S/C and intercooler will make it to read too hot and pull too much timing.. Putting it after the intercooler will allow it to read juuuustt right and then it'll feel like taking a nap after eating all that porridge... errr... You get the idea..

Edit: I think your BOV is setup properly.. The air it vents hasn't gone though the MAF yet so the ECU isn't expecting it and won't add fuel making it run rich..

Riley

 

[spederman]

Yeah, ive been finding out that my setup is definately not good. I would assume its a really conservative tune otherwise this shop would prolly have a lot more angry customers with blown motors. That would explain why my numbers are lower than people with similar setups that dont have intercoolers like i do. I thought i would have easily been over 400hp. I'm taking it to another shop tomorrow to get a second opinion on what they think and have them retune it this week.