Biggie Boost on 91 oct
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
I'd like to keep it on my side for now.

That said, I highly doubt I could do this with a MBC. The ecu-boost control so far as been very vital to this.
Bummer, I figured as much. What about running on wastegate boost only as I am ??
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
Went out again tonight to dial in some more boost but didn't get past the first pull. Ignition is breaking up.
I put some new Iridium temp 8 plugs in when I switched to 91 oct a couple months ago and now I remember I just put them in straight out of the box. I think the gap is at .028 or .029. Lil' too big for 26psi plus.
I left my tools and extra plugs at the shop so I will swap the plugs out tomorrow.
I put some new Iridium temp 8 plugs in when I switched to 91 oct a couple months ago and now I remember I just put them in straight out of the box. I think the gap is at .028 or .029. Lil' too big for 26psi plus.

I left my tools and extra plugs at the shop so I will swap the plugs out tomorrow.
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
Keep in mind the car loads a little differently with a pull from 2500, and a pull from 3500, etc etc
I do alot of different starting points to establish good data. For setting boost, it's very important so you don't get overshoots from different RPM start points. Reason is the boost ramps up much quicker in higher RPM than lower RPM.
You could have the boost control dialed in from a 2500 RPM sweep, then get on the hwy, downshift into 3rd from 4th and overshoot.
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
Thread Starter
Joined: Aug 2003
Posts: 14,092
Likes: 1,090
From: Mid-Hudson, NY
Changed my plugs and re-installed my open filter at the shop today. Did a couple quick pulls on the way home. 26.5 psi with no spark plug break up and no knock, still on 91 octane.
This weekend I will get some more logs with data.
This weekend I will get some more logs with data.







