|
|
|
|
Thread Tools | Display Modes |
11-18-2012, 10:49 AM | #1 |
Scooby Newbie
Member#: 310385
Join Date: Feb 2012
Chapter/Region:
HIIC
Location: Honolulu, HI
Vehicle:2016 BRZ Limited Series.HyperBlue |
FMIC installed, now throttle delay?
Hey guys, I just did a Perrin FMIC install on my 12 STi, and now have a small issue I'm not really sure about. When I'm taking off, it seems like I have to add more throttle than usual, and it feels like there's a short delay. Anyone have any thoughts?
Other than that, I checked all connections and did a log while I drove it around the block. Everything looked good.
* Registered users of the site do not see these ads.
|
11-18-2012, 10:59 AM | #2 |
Scooby Specialist
Member#: 277487
Join Date: Mar 2011
Chapter/Region:
NWIC
Location: Bozeman, MT and Lakewood, WA
Vehicle:2006 CGM WRX Limited 6sp, 18G, Phatron tuned |
Turbo lag?
From Unabomber's FMIC FAQ: What about the additional lag of a FMIC? This topic is highly debated. The two general trains of thought are: 1. FMICs increase turbo lag. 2. FMICs decrease throttle response. |
11-18-2012, 11:07 AM | #3 |
Scooby Specialist
Member#: 321715
Join Date: May 2012
Chapter/Region:
Tri-State
Location: Philly/SJ
Vehicle:03 Big 16G WRX PSM |
|
11-18-2012, 11:08 AM | #4 |
Scooby Newbie
Member#: 257195
Join Date: Sep 2010
Chapter/Region:
South East
Location: Hixson
Vehicle:2004 WRX 2.1L |
Turbo lag bro. The air has to travel much further so there is a slight delay.
|
11-18-2012, 11:12 AM | #5 |
Scooby Specialist
Member#: 277487
Join Date: Mar 2011
Chapter/Region:
NWIC
Location: Bozeman, MT and Lakewood, WA
Vehicle:2006 CGM WRX Limited 6sp, 18G, Phatron tuned |
|
11-18-2012, 11:16 AM | #6 |
Scooby Newbie
Member#: 257195
Join Date: Sep 2010
Chapter/Region:
South East
Location: Hixson
Vehicle:2004 WRX 2.1L |
Granted it will work fine. You can also not have to worry about heat soak. Also if you ever plan on running more boost it won't be a problem.
|
11-18-2012, 11:20 AM | #7 |
Scooby Specialist
Member#: 284792
Join Date: Jun 2011
Chapter/Region:
RMIC
Location: Vanilla Valley, CO
Vehicle:2011 STI Blurple |
Professionally tuned?
|
11-18-2012, 11:46 AM | #8 | |
Scooby Specialist
Member#: 153412
Join Date: Jul 2007
Chapter/Region:
MWSOC
Location: Springfield,il
Vehicle:1998 Impreza wrxRS Black |
Quote:
Width not length |
|
11-18-2012, 02:59 PM | #9 |
Scooby Specialist
Member#: 163672
Join Date: Nov 2007
Location: Where the sidewalk ends...
Vehicle:GV Same color as veneers |
Turbo lag is not the correct term.
No variables have changed causing the turbo to spool any slower. The correct term would be delayed throttle response. The air is compressed at the same rate, but the air has to travel a longer distance. |
11-18-2012, 03:26 PM | #10 | |
Scooby Guru
Member#: 255776
Join Date: Aug 2010
Chapter/Region:
MWSOC
Location: Laramie, WY
Vehicle:2010 LR WRX MPS powered. |
Quote:
|
|
11-18-2012, 03:41 PM | #11 |
Scooby Newbie
Member#: 333285
Join Date: Sep 2012
Location: Long Island NY
|
which is just a fancy way of saying turbo lag
|
11-18-2012, 03:58 PM | #12 |
Scooby Specialist
Member#: 163672
Join Date: Nov 2007
Location: Where the sidewalk ends...
Vehicle:GV Same color as veneers |
False... The turbo is not lagging
|
11-18-2012, 04:00 PM | #13 |
Scooby Specialist
Member#: 156877
Join Date: Aug 2007
Chapter/Region:
MAIC
Location: Montgomery Village, MD
Vehicle:04 sti |
someone else said it... is it tuned for the fmic? my guess would be no
|
11-18-2012, 04:01 PM | #14 | |
Scooby Guru
Member#: 99289
Join Date: Oct 2005
|
Quote:
|
|
11-18-2012, 04:07 PM | #15 |
Scooby Specialist
Member#: 163672
Join Date: Nov 2007
Location: Where the sidewalk ends...
Vehicle:GV Same color as veneers |
You're misinterpreting the variables.
The turbo will naturally have characteristic lag. The lag that the OP is describing is not turbo lag. It is delayed throttle responses from the variable that did change. The longer pipes of the intercooler. Your quote is irrelavant. |
11-18-2012, 04:07 PM | #16 |
Scooby Specialist
Member#: 316364
Join Date: Apr 2012
Chapter/Region:
MAIC
Vehicle:2012 WRX |
Did you reset the ECU? Any time I do this my gas pedal's sensitivity changes. Your issue may be related your your FMIC but the way you describe it sounds exactly like what happens when you reset the ECU.
|
11-18-2012, 04:36 PM | #17 |
Scooby Specialist
Member#: 245218
Join Date: Apr 2010
Chapter/Region:
South East
Location: FL
Vehicle:2013 STI Limited |
You need a tune for a FMIC to remove the laggy throttle response.
|
11-18-2012, 04:52 PM | #18 |
Scooby Newbie
Member#: 310385
Join Date: Feb 2012
Chapter/Region:
HIIC
Location: Honolulu, HI
Vehicle:2016 BRZ Limited Series.HyperBlue |
Turbo lag when I shouldn't be producing boost? I'm going to guess the delay is just because of the longer piping as some have already said... this is also what I had assumed but wasn't sure. I'm pro-tuned with the stock TMIC, by the way.
It's not going to hurt anything if I run it like this for the next few weeks is it? Trying to delay a new tune until I get the rest of my goodie box under the hood. |
11-18-2012, 04:57 PM | #19 | |
Scooby Guru
Member#: 99289
Join Date: Oct 2005
|
Quote:
|
|
11-18-2012, 05:47 PM | #20 | |
Scooby Specialist
Member#: 284792
Join Date: Jun 2011
Chapter/Region:
RMIC
Location: Vanilla Valley, CO
Vehicle:2011 STI Blurple |
Quote:
|
|
11-18-2012, 06:12 PM | #21 | |
Scooby Specialist
Member#: 163672
Join Date: Nov 2007
Location: Where the sidewalk ends...
Vehicle:GV Same color as veneers |
Quote:
The quote compares a turbocharged application to a NA application. The OP described an issue. The relevant parts of the system that alter the spooling characteristics have not been touched. The natural lag associted with the system is still present. The turbo is not lagging anymore than it did prior to his fmic install. To say the cause is turbo lag is incorrect. The culprit is throttle response, and the need for a tune to account for the pressure drop in the system. |
|
11-18-2012, 06:45 PM | #22 |
*** Banned ***
Member#: 16200
Join Date: Mar 2002
Vehicle:OK buy Nates beans westcoastroasting.com |
i guess you figured out why a fmic may not be the best idea, didnt ya??
|
11-18-2012, 07:13 PM | #23 |
Scooby Newbie
Member#: 310385
Join Date: Feb 2012
Chapter/Region:
HIIC
Location: Honolulu, HI
Vehicle:2016 BRZ Limited Series.HyperBlue |
|
11-18-2012, 08:08 PM | #24 |
Scooby Guru
Member#: 112759
Join Date: Apr 2006
Chapter/Region:
MWSOC
Location: In the V hole!
Vehicle:2015 Stock OEM AsFu* 3.6r OMG S.C'd |
|
11-18-2012, 08:32 PM | #25 |
Scooby Specialist
Member#: 300551
Join Date: Nov 2011
Chapter/Region:
SCIC
Location: mariposa ca.
Vehicle:2002 FOZ STI 2.34 Fullers Garage |
It seems to me throttle response (engine responding to the throttle petal being pushed) and turbo lag (the time it takes the turbo to build boost) are two different things. Is the op complaning about the off boost response or the delay in boost? It does need a tune ether way.
|
Thread Tools | |
Display Modes | |
|
|