palmerwmd wrote:The best things to do either once u changed something ( exhaust spacer whatever) is to do a uprev tune on a tune. these cost real money ( 700 bucks a few years ago) but u get to keep the software and tuning adapter and they ae proven to work... and to make the best out of any mods u might have added.
Real money indeed but might be more complexity and time than I am inclined to engage in currently. Maybe the simpler bully dog one day.
ShipFixer wrote:From an engineering perspective, no...not much point. I agree with this article:
https://itstillruns.com/advantages-disa ... 85215.html
I have the manifold spacer on my Pathfinder and it definitely helped smooth throttle transients by adding volume to pull from. Basically my truck downshifts a lot less since there is no sudden drop in airflow. Any advantage the throttle body spacer gives you would be from the same volume increase...the ridges and whatnot are dumb and don't do anything meaningful other than make your intake sound like a whistle if you're into that sort fo thing.
No whistle for me! Great article; thanks for posting that and your review of your IMS. The explanation of why the IMS works for our VQ so well may be explained by:
“Engine families typically come in multiple displacements, and it's not unusual for the largest engine in a given family to run 25 percent larger than the smallest. Manufacturers typically prefer to save a few dollars by using the same intake manifold for every engine in a family rather than to create several optimized versions for each bore and stroke combination. So, if you've got one of the larger-displacement engines in an engine family, you could have wound up with a plenum about 25 percent undersized for the application.â€
I guess we may have the same/similar size intake mainifold as the VQ37 and VQ35?