As many of you know I had a failure of my Magnus SMIM, and put on a ported stock intake manifold as a replacement. I had to wait until now to do some real data logs because I wanted to put new injector isolators on befor going into heavy boost. I finished that up today, and the results are interesting!

Running a speed density system with the AEM EMS, so any significant changes in air flow will show changes in your A/F reading on a data log. Here is the jist of the testing.

Virtually identical spool up and A/F ratio until above 7000 RPM. At around 7300 RPM the ported stock intake manifold log shows a significantly richer A/F ratio all the way up to 8000 RPM where they showed an A/F ratio of 10.75:1 for the ported stock manifold vs the same tune with the Magnus SMIM where the A/F ratio was 11.3:1

My conclusion is that the Magnus has no downfall in the lower RPMs compared to a ported stock intake manifold, and shows significant gains in air flow above 7,000 RPM. Keep in mind this was one of the first SMIM's Magnus made for the EVO, and did NOT have the velocity stacks in it.

My impression from driving the car (seat of the pants "feel" of the car) is that the off boost throttle response of the Magnus SMIM was much better than the off boost throttle response with the ported stock intake manifold.

Later,

Keith

 

8,000rpms ?

 

Nice been looking for some hard evidence good info THANKS.

 

that cool, where did you get your stock man. ported.

 

nice!!!!

 

?????????????

 

So at least I didnt get the stupid thing in vein

By the way.. ever figure out why it blew up? Backfire or just a mishap?

 

Ttt???