Is it better to have your boost reference (for your boost controller) plumbed in before or after the intercooler? I know that there are pressure drops in the I/C, but does it really matter? You just tune differently for which ever way you have it set up, right? Just curious as to what some of the opinions are out there and why.

 

It doesnt really matter but most choose before the intercooler for better wastegate response...right on the turbo would be the best. Also try to keep it close to the wastegate or boost controller so you dont have a mile of tube in the engine bay, the shorter the better.

 

Its all relative really. If you are running straight off the wastegate spring you can use the pressure difference to tweak your manifold boost pressure. But if you are running a mbc or ebc then before or after doesn't matter as much as the boost controller would just need more or less duty (or pressure) to affect the wastegate, depending on the source.

 

Guess I should have been more specific. I am running Hondata S300 with the MAC solenoid for boost control. The reason I asked is because I have just upgraded the size of my I/C as well as all of the piping. Before, everything was smaller (and to the point of becoming a major restriction) and I had my reference plumbed in right after the turbo. Now with the new set up the reference is plumbed in directly after the I/C which is significantly bigger. We did some runs on the dyno and found that I was getting a lot of boost creep. Had to change from a 38mm WG to a 46mm. While doing this, we plumed in another fitting for the boost controller before I/C for tuning. That's why I was wondering what the difference would be. Thanks for the input.