Cold AIT's and boost

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Feb 2, 2012 | 08:16 AM

#11

JoeyBalls

Joined: Jan 2008

Posts: 9,570

Likes: 3

From: New Jersey

I gain 4lbs, with an open downpipe & two wastegates...... I run 100 octane in the winter months to compensate for the increased boost

Feb 2, 2012 | 08:41 AM

#12

spectacle

Joined: Sep 2004

Posts: 4,894

Likes: 9

From: Tampa, FL

Quote:

Originally Posted by DFWs2k

hm, i don't know, i'll have to look

i just lowered my boost to 13psi so even if it does spike, doesn't go much over 15

If you're running Hondata still, then the answer is no. I've asked about it, here's the response:

Quote:

Originally Posted by Hondata

PID control is difficult for boost control is some ways. To start with you need the wastegate and control solenoid plumbed correctly so that the natural boost curve is flat to begin with. Next you need a starting duty cycle to boost table and correction table. Then you need to tune a correction table and then go through the PID setup process, where you change P values to achieve a certain frequency, and then turn the I and D components. It turned into a lot of fiddling around, far more so that the straight duty lookup we currently use, and we felt many people would not achieve good boost control. Perhaps it will be an option in the future.

As a bridge, I've also asked for a boost temp comp table to be added that would be way easier to setup and maintain. Here's that response:

Quote:

Originally Posted by Hondata

I do not believe there is room in the ECU for another table.

Feb 2, 2012 | 08:50 AM

#13

camuman

Joined: Oct 2002

Posts: 8,044

Likes: 6

From: South Florida

Lol@that. Aem wins this battle. Hondata fail.

Oh well. Guess you need a cold weather tune and warm weather tune.

Feb 2, 2012 | 11:43 AM

#14

Dan1987

Thread Starter

Registered User

Joined: Jul 2009

Posts: 331

Likes: 1

From: Northampton/Leeds

Quote:

Originally Posted by camuman

I use to gain a psi when the wether dropped from 90f to 40f. But not 4 psi. That's nuts. My guess is u were running more boost then u thought on the stock map sensor. What sucks is your gonna have to rescale the tune and retune up top at the very least. R u the tuner?

Hey,

Yeah I went out the other night and retuned right up the load lines to 15psi, so the fueling is fine now.

When it started happening I would see WOT afr's around 0.7 leaner which would gradually come back down to my usual 11.8:1 after 25mins..At first I thought the problem was fuel was sticking to the cold inlet ports, so I messed around with the coolant temp comps and AIT comps...then I did a load of data logs on my way to work and saw the boost pinning, and then coming back to normal 10/10.5psi once the engine bay had warmed up and the intake temps had risen. so then it was pretty obvious it was over-boosting.