Matt Danger's B5 S4 Owner Log

I ordered Evolution Raceworks side mount intercoolers yesterday. I was divided between those or a front mount. FMIC kits are cheaper and have yielded better results, but I didn’t want to deal with cutting everything up to mount it and then not have things fit well and deal with more boost leaks.

I am currently running RS4 intercoolers and further cooling the charge with water/meth. The IATs hover about 20* over ambient and I know they can be lower.

Conveniently, my friend Brad with a K04′d S4 just had ERs installed along with a fueling kit and tune for e85. Last week we met up and ran some logs.

Here’s a plot of the two setups:

I talked to someone in Canada with the same Vast 93+meth tune, but with ERs. He said his IATs hover around ambient, so I’m hoping that’s where I end up.

For kicks, here’s a plot of 4 setups. Brad’s stock SMIC car on K04s, my stage2+ car on just RS4 SMICs, my current RS4+meth setup and Brad’s current ER setup. Soon I’ll add a ER+meth plot

I bought a MBC and a used N75 valve to try and correct my fluctuating boost. I don’t install the MBC but I do install the N75. The N75 doesn’t seem to help and after the install I have a “Signal too low” code for my MAF. Swapping the MAF with another doesn’t resolve the issue, it appears one of the wires in the harness may be broken. Dammit.

I got a copy of ECUx from a friend and set it up on my laptop. He couldn’t get it to work on his laptop so he let me try it. In return, I find a work around to get it working on his laptop. I ran a mediocre 5.2 FATS. The boost (actual) shows a minor fluctuation that I need to figure out. I’m thinking the n75 boost controller is bad.