|
|
|
|
Thread Tools | Display Modes |
04-22-2007, 11:32 AM | #1 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
Perrin 816's giving me a lean condition
I put in my modded Perrin 816's yesterday, rescaled the injectors and am now getting a lean condition. I have a 20g, external tial, full catless turboback and now the 816's. I'm tuning with Enginuity.
From my understanding, I shouldn't have needed to re-scale the MAF just for injectors if nothing else has been changed. I am running wastegate boost (.6bar), and had it tuned pretty well for that boost with the stock injectors in. I was expecting a richer condition, and am totally lost as to why it is running lean. Anyone have any insight on why this would be happening? I thought I had a fairly good sense of what I need to do to tune the car, but maybe I bit off more than I can chew.
* Registered users of the site do not see these ads.
|
04-22-2007, 11:41 AM | #2 |
Scooby Specialist
Member#: 105404
Join Date: Jan 2006
Chapter/Region:
NESIC
Location: Fitchburg, MA
Vehicle:2006 FPGreenSTI SOLD 04 GMC 2500HD Duramax CC |
Did you have the injectors cleaned and flow tested prior to installing? Guessing not. So there may be a lot of variance in the injectors and even all of them possibly not being close to 816. Some people can get away with not doing it and just installing them but sometimes its money well spent to do it. I would talk to one of your local tuners about it. Do you have a wideband? Just scale the injectors down to like 790's possibly and see what happens. Or go through your fuel maps and richen everything a little but its easier to scale down the injectors.
|
04-22-2007, 12:13 PM | #3 |
Scooby Newbie
Member#: 29716
Join Date: Nov 2002
Chapter/Region:
MWSOC
Location: Minneapolis
Vehicle:2006 wrx wagon booze powered e85 monster |
My initial guess is that your injector scalar is off and will need to be adjusted.
|
04-22-2007, 01:26 PM | #4 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
I do have a wideband. I rescaled to 790 and it's still idling lean. I may scale it down even more and see what that does.
|
04-22-2007, 02:35 PM | #5 |
Scooby Specialist
Member#: 88322
Join Date: Jun 2005
Chapter/Region:
MWSOC
Location: Indianapolis, IN
Vehicle:2009 BMW 135i |
790 is still too large. The setting is not actually in CC/min, even if your editor shows it as CC/min, so it will never match the supposed rating of your injectors. IME you always need to set it smaller. Try around 750.
Other than that, post a log with all fuel trims (learning, correction, etc) and front O2 signal (NOT your wideband, it is not needed for this problem). |
04-22-2007, 03:26 PM | #6 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
Thanks man. I'll try that out and see if it works. I'll do some logging this afternoon and will try and post them up. I'll tune it on higher boost throughout the week, i'm still bypassing my boost controller right now to ensure the injectors are workign correctly.
|
04-22-2007, 08:37 PM | #7 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
I was told by a very credible source that with the perrins you have to scale them around 610. I did that and it richened up. Still idling in the 14.8-15.1 range, but I can live with that. I just did a couple pulls with the boost controller hooked up and need to pull fuel majorly. My wb02 was layin around 10:1 through the pull, so I'm gonna pull some fuel and see if that helps.
I'll mess with it daily till I get it tuned nicely. I'm still a little concerned with the kc of -5 throughout the pull, but that isn't gonna blow my motor. I'll pull some more timing when I flash it again. Thanks for your help. |
04-22-2007, 11:00 PM | #8 |
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region:
MWSOC
Location: Carol Stream, IL
Vehicle:'01 GC8 Dinged STM '09 Concours 14 ABS Black |
14.8-15.1 is the proper range for closed loop operation.
|
04-23-2007, 12:21 AM | #9 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
Really? I thought it was supposed to be 14.7. I know it won't sit at 14.7 and not move, but anytime I see 15's on the gauge I get a little nervous. I know that it's not imperative that it idles at stoich, but it's nice to make an attempt.
I guess I got it nailed down then. |
04-23-2007, 05:38 PM | #10 |
Scooby Specialist
Member#: 105404
Join Date: Jan 2006
Chapter/Region:
NESIC
Location: Fitchburg, MA
Vehicle:2006 FPGreenSTI SOLD 04 GMC 2500HD Duramax CC |
I saw this thread last night. Me and a fellow open ecu user had used 810 for the injector scaling. The cars idle was ****ty since i started it saturday and drove it all yesterday. Today it kept dying and it was heating up. I pulled over, plugged in ECu Explorer and saw 16's and 17's at idle. Got very scared. Dropped them to 790 and still saw 16's. Dropped to 750 and said 15.5-16.3 so then i dropped them to 720 and its sitting solid at 14.7 at around 700-750 rpm idle.
|
04-23-2007, 09:45 PM | #11 | |
Scooby Guru
Member#: 92894
Join Date: Aug 2005
Chapter/Region:
BAIC
Location: nomo splitting lanes LOL
Vehicle:2015 Wrx - fury kit silver duh |
Quote:
Last edited by wuuusaa; 04-23-2007 at 09:46 PM. Reason: your using open ecu as engine management |
|
04-24-2007, 11:25 AM | #12 | |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
Quote:
|
|
04-25-2007, 12:12 AM | #13 | |
Scooby Specialist
Member#: 105404
Join Date: Jan 2006
Chapter/Region:
NESIC
Location: Fitchburg, MA
Vehicle:2006 FPGreenSTI SOLD 04 GMC 2500HD Duramax CC |
Quote:
|
|
04-25-2007, 12:44 PM | #14 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
I didn't get a chance to mess with mine. I'm gonna need to switch to a Big Maf setup cause i'm pulling 4.7v on 15-16 pounds and that will go up when I mess with it some more tonight.
|
04-27-2007, 01:51 PM | #15 | |
Scooby Specialist
Member#: 68197
Join Date: Aug 2004
Chapter/Region:
South East
Location: south florida
Vehicle:2005 OBP WRX PPG + EJ257 |
Quote:
My tuner had mine set to 890. I kept getting system lean, so I went back and he retuned it and had them set at 865. After about 200 miles I would get a system lean CEL. I just kept resetting the ECU as a temporary solution. bad idea because now I have a spun rod bearing, most likely due to detonation from running lean ...when I get the new block, should I scale them way down to less than 800? I need some sort of map to drive the car around untill a good tuner flies down. (BTW my intake is 2.5 inches untill I can get a new one, should the MAF be scaled at all?) |
|
04-27-2007, 02:11 PM | #16 |
Scooby Specialist
Member#: 88322
Join Date: Jun 2005
Chapter/Region:
MWSOC
Location: Indianapolis, IN
Vehicle:2009 BMW 135i |
You're placing WAY too much importance on the value. Use what works looking at your fuel trims.
Again, the ECU actually doesn't use cc/min. It's an inverse value, some sort of ontime for a certain airmass (like on time to match stoic 1g of air). Stop worrying so much about it matching some number you got from a flow test or rated flow from the manufacturer. Use what works by looking at your fuel trims, confirm open loop is still right with a wideband. I would not suggest swapping intakes and injectors at the same time. Do one or the other, adjust the correct parameter (injector size/deadtime for injectors, MAF scale for intake), make sure it is right, then swap the other part. There is such a close correlation between the two if you swap both at the same time you will never know if you're tuning the wrong parameter for the right part change. |
04-30-2007, 08:07 PM | #17 | |
Scooby Newbie
Member#: 137403
Join Date: Jan 2007
Vehicle:2008 STI DGM |
I followed this Street Tuner User Guide recommendation:
Quote:
|
|
05-01-2007, 12:52 AM | #18 |
Scooby Guru
Member#: 126242
Join Date: Sep 2006
Chapter/Region:
TXIC
Location: RIP Seannie 6/16/07
Vehicle:2005 STi/2012 GTR TXIC's most loved |
Mine found their happy place at 700.
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Give me light, give me action | mvstype | Off-Topic | 19 | 06-02-2005 06:54 PM |
lean condition on 1.8L w/intake & exhaust? | RaceCarRiot | Normally Aspirated Powertrain | 1 | 01-08-2002 04:38 AM |
lean condition | KITTbri | Normally Aspirated Powertrain | 4 | 02-23-2001 12:48 AM |
Cheap way (under $200) to correct lean conditions? | Overtime | Technical Forum Archive | 0 | 08-29-2000 07:10 PM |