Aftermarket Intake + Bog Issues - Read Here

[AJUSA.com]

Have you tried it with the stock flash yet?

[2forme]

Originally Posted by AJUSA.com

Have you tried it with the stock flash yet?

Just switched over today (had to burn through the rest of the e85). It had the same issue happen taking off from a stop light .

I'm going to see if I can nail it in a Torque app video (showing throttle and maf reading) as well as new logs.

[Visconti]

Originally Posted by AJUSA.com

Have you tried it with the stock flash yet?

He has

[AIRAID]

Originally Posted by David@Airaid

Hi guys, just so you know we have been monitoring this thread and will be doing some data logging with our own FR-S here at our facility. We will be sure to report our findings as soon as we have something.

Gentlemen,

an update on the bog concern from a few members here on the board. Our engineers here took our company FR-S and did some data logging/testing on it to see if we couple duplicate the bog that a couple of you are experiencing. First they drove the car for about 50miles in 100% stock form and logged the data. They then installed our AIRAID cold air intake on it and went out drove it again for about 50 more miles all while trying to duplicate the bog issue using the test that user Jidonsu explained. We were unable to get our test vehicle to duplicate the bog in either form. We have been in touch with John @ Visconti and have offered to send him an intake for testing.

Testing Procedure:

Put car in 1st gear, let car accelerate to 5mph. Foot off gas pedal and let car settle around 5mph, which for me is around 800rpm or so. Quickly increase throttle. Observe whether the revs climb steadily and smoothly to 2000rpm and beyond or not.

http://www.ft86club.com/forums/showthread.php?t=15651

Thanks,
David

[gmookher]

Originally Posted by Entropy

I know in the LS1/2/3/4/6/7/9 crowd, most tuners won't touch a car without a MAF "screen/honeycomb," because the air is so turbulent that it throws off MAF readings, thus affecting the tune.

I bet something like this in the intake pipe would reduce or eliminate the bog:

I bet not.

[2forme]

Originally Posted by gmookher

I bet not.

Yea, considering it doesn't fit LOL

[2forme]

Originally Posted by David@Airaid

Gentlemen,

an update on the bog concern from a few members here on the board. Our engineers here took our company FR-S and did some data logging/testing on it to see if we couple duplicate the bog that a couple of you are experiencing. First they drove the car for about 50miles in 100% stock form and logged the data. They then installed our AIRAID cold air intake on it and went out drove it again for about 50 more miles all while trying to duplicate the bog issue using the test that user Jidonsu explained. We were unable to get our test vehicle to duplicate the bog in either form. We have been in touch with John @ Visconti and have offered to send him an intake for testing.

Testing Procedure:

Put car in 1st gear, let car accelerate to 5mph. Foot off gas pedal and let car settle around 5mph, which for me is around 800rpm or so. Quickly increase throttle. Observe whether the revs climb steadily and smoothly to 2000rpm and beyond or not.

http://www.ft86club.com/forums/showthread.php?t=15651

Thanks,
David

Dave did you have a chance to review the graph I posted? It shows a very extreme case of the bogging (car actually slowed down under WOT). I can send you the log file as well.

I'm probably going to do a video showing the gauge cluster, with digital readouts of RPM, THROTTLE %, and MASS AIR FLOW RATE via the Torque app on my phone.

I can't do a log file at the same time, because Torque will be using the OBDII port for the video. Let me know if you'd like to see anything else.

Also, try higher gears like 2nd or 3rd. Doesn't have to start at 800 RPM, I usually experience it around 1500-2250.

EDIT: moved it to this thread, didn't see this post over here.

[2forme]

New update:

Sorry it's taken me a while, was pretty busy today. I've been able to try all 3 maps out with the intake and got some interesting results.

e85 - Bog w/ violent jerk
stock - Bog w/ only 1 violent jerk (probably still adjusting)
stg1 (1.02) - nothing so far.....

Only 15 miles on the 1.02 map, but I haven't experienced anything so far. Slight hesitation between shifts, but nothing on the drivability front.

Very interesting results.....

[Visconti]

I'll have mine in a few days !

[JTM]

Did your test on the way into work this morning, no bogging. As I stated in the other tread you mostlikely have a vacuum leak.

[2forme]

Originally Posted by JTM

Did your test on the way into work this morning, no bogging. As I stated in the other tread you mostlikely have a vacuum leak.

PCV isn't a vacuum and I'm certain the elbow is nice and tight in the tube. Everything is secure. I can post a picture if you don't believe me.

I'm confident it's the fussy denso MAF being fussy. The 1.02 tune just seems to correct a little of it as to not be violent.

I didn't drive to work today. Will definitely know more after the weekend. Doing plenty of driving.

[Keith@AIRAID]

Originally Posted by 2forme

New update:

Sorry it's taken me a while, was pretty busy today. I've been able to try all 3 maps out with the intake and got some interesting results.

e85 - Bog w/ violent jerk
stock - Bog w/ only 1 violent jerk (probably still adjusting)
stg1 (1.02) - nothing so far.....

Only 15 miles on the 1.02 map, but I haven't experienced anything so far. Slight hesitation between shifts, but nothing on the drivability front.

Very interesting results.....

You probably need to drive more miles to let the ECU settle in to the changes you are throwing at it. I like to do 50 miles of varied driving with each change, watching fuel trims and g/s the whole time. Of course each car is different, but this generally is enough time and varied driving conditions.

[Keith@AIRAID]

Originally Posted by 2forme

PCV isn't a vacuum and I'm certain the elbow is nice and tight in the tube. Everything is secure. I can post a picture if you don't believe me.

I'm confident it's the fussy denso MAF being fussy. The 1.02 tune just seems to correct a little of it as to not be violent.

I didn't drive to work today. Will definitely know more after the weekend. Doing plenty of driving.

PCV is positive pressure from the crankcase, but any leak in the intake path is still a vacuum leak.

[2forme]

Originally Posted by Keith@AIRAID

You probably need to drive more miles to let the ECU settle in to the changes you are throwing at it. I like to do 50 miles of varied driving with each change, watching fuel trims and g/s the whole time. Of course each car is different, but this generally is enough time and varied driving conditions.

No problem. I'll do that this weekend. Keeping the fingers crossed for the 1.02 . It's the first tune that doesn't show issues right off the bat. Thanks Keith!