Air intake temp Comparison intercooler pipe routing

[Slow_Old_Car]

SOC, thank you for doing all of this testing. I believe that the results are still a bit skewed because of the difference in boost pressure. More pressure = hotter air charge.

 

Edit:

 

"I'm not really suprised the 6061 piping performed better. I don't think anyone is really. However what i did find interesting is what happens after you shut the throttle. I will have to go back and look at both cars deccel enrichment settings, but the car with mild steel piping has it's IAT readings shoot up when the throttle closes, where as the 6061 piped car has its IAT readings go down.

 

Now this could be the steel pipes being heat soaked and dumping it all into the engine which now has no fresh supply of cooler air so the charge temps go way up, this could be because the deccel enrichment settings are completely different, etc... not really sure."

 

This is really surprising. The temperature climbed another 22 degrees with the throttle shut! That is huge. Remember that eventhough the turbo is not boosting, the engine is still getting cool air though not at nearly the same flowrate. As for deccel enrichment, I am not sure how this would cause an increase in IATs. You IAT is not affected by the combustion temps in the cylinder unlike CLT.

 

If you do any additionaly testing, try pulling over immediately after the run and measure the skin temperatures of the aluminum and mild steel piping.

 

That is odd, i wasn't boosting 14.2psi on the mild steel pipe car (both cars reading 10psi on there mechanicle gauges). I was getting improper AFR readings on the megasquirt too on the mild steel piped car (not jiving with the AEM UEGO wideband even though it was selected in the config files). Perhaps i need to reflash it's firmware. The difference in boost registers between the two cars shouldn't be there. The aluminum has the standard 2.5 bar map sensor that DIY supplies stock. Then mild steel car has the map daddy 4 bar upgrade on it. I'll have to go double check the config files to make sure they are not jacked up.