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Old 01-21-2005, 09:27 PM   #1
scooby24
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Default Holy Crap my IDC's are maxing out!!! WHY?!

Ok I'm just a Stage 2 STi

-Invidia TBE
-Stock Intake
-Ported Wastegate

I was playing around with some maps tonight and my normal map was running like ass..popping at WOT...sounded like it was running rich as hell. So I go to turn on logging and it turns out I'm maxing my injectors out hardcore. It's not getting a reading from like 4500 rpms up.

So I played around with the map more and couldn't get it running right so I loaded up the TurboXS stock STi Stage 1 map and it's doing the same thing. Injectors maxing out like crazy. Boost isn't even that rediculously high. Running 18 lbs dropping to 16 by redline.

I believe it may be due to the extremely humid air. Here are the conditions outside right now:

Fog 36F
Feels Like
29F
Wind: From W at 9 mph
Humidity: 93%
Pressure: 29.85 in.
Dew Point: 34F

It's really really foggy outside but it's not a normal fog...almost looks like mist...the ground is wet, etc. etc.

Could the moisture in the air raise IDC that much? Will someone explain to me what is going on? I'm so nervous right now I don't want to drive my car hard....but at the same time I believe that maybe the moisture is cooling down the MAF more than it should and the MAF thinks I'm running more air so it dumps fuel which would mean I'm prolly safe...just running uber rich. Could this be the case?

AHHHH!!!!
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Old 01-21-2005, 09:39 PM   #2
hondaeater69
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just sounds like you're running too rich. What kind of AFr's are you seeing?
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Old 01-21-2005, 09:50 PM   #3
scooby24
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I wish I could tell. I've got a wideband but don't have it hooked up yet. Had it hooked up the other night and was getting 10.5:1 AFR with a 1.3 fuel value towards redline....the base stage 1 is .3 at redline...Both of those fuel numbers are maxing out the injectors...
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Old 01-21-2005, 10:04 PM   #4
serendipity
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Are you sure your UTEC is set up right? Are you running Open Loop Fueling?

With the basemaps, your IDCs should be pretty safe (I think I maybe hit 85-90% on the basemap, tops?). Humidity won't significantly skew MAF readings.
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Old 01-21-2005, 10:45 PM   #5
MojoHand
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It's been demonstrated repeatedly that a TBE and increased boost can max the injectors on an STi. This is particularly true in colder weather.
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Old 01-22-2005, 01:50 AM   #6
scooby24
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yeah the Utec is setup right. Running the TurboXS default of closed loop fueling to 25% TPS and then Open loop after that. Closed loop boost also.

It's never seen these kind of IDC's even with this temperature and boost level. Most it's ever hit is 98 at redline, it's never been maxed all the way accross the boards.

Also I have a theory to why the boost is dropping quite a bit...lemme run it by you guys and see if you agree.

MAF stays the same and IDC's don't drop with the boost so I'm assuming the wastegate is not overflowing...ie...the turbo is pulling in a constant amount of air...so theoretically there is one of two issues...

1) There is a leak past the turbo - which MAY be the case because since first taking off the intercooler I've heard a slight hissing coming from the drivers side whenever I hit boost. The turbo hose and intake manifold hose are always on securely but I've still always heard the hissing...I'm wondering if it's where the turbo hose connects to the Y pipe...

2) The turbo is pushing a constant amount of air but the engine is sucking in more and more air at an exponential rate thus causing the boost to drop as the turbo cannot push anymore air. I'm willing to accept that answer but I've just not seen it drop off so much. I'll be at 1.25 bar at peak and it will drop to right around 1.0 by redline. Makes me think I'm really losing power...but if there is nothing I can do about that then there is nothing I can do.

Do you guys have any trouble maintaining constant boost on the VF39?

FYI my MAF readings after mod are right at 4.3 - 4.4 all the way to redline once peak boost is reached.
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Old 01-22-2005, 02:37 AM   #7
CBRDSpeedfactory
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Default hey

email me...

slamdvw@aol.com

cb
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Old 01-22-2005, 03:33 AM   #8
SaabTuner
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Worth mentioning:

The MAF sensor senses how much it is cooled; that's how it knows how much air is passing through.

If lots of water droplets hit the PTC resistors (hot "film" element) it will think there is more air than there really is passing through.

That makes it over-fuel because it injects fuel for the air and the water, only the water doesn't burn.


Most cars have no compensation for humidity except O2 feedback during cruise to correct MAF readings. Only some cars apply that correction to full throttle.

Adrian~
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Old 01-22-2005, 03:35 AM   #9
Russ77
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it's cold and humid. very good conditions for a turbo car to run lots of boost. more boost needs more fuel.
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Old 01-22-2005, 04:13 AM   #10
CBRDSpeedfactory
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Default well..

when i tuned...

our idc's went from 100 to 95 because the base maps were so rich, with only 10.8-11.1 we made 267/292 on a mustang with just our i/c...

1.3 bar

chad b
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Old 01-22-2005, 08:19 AM   #11
Abe Froman
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Without fuel tuning 16psi at redline is going to max your injectors on the stock maps, I can only pull about 14.5psi at redline(I do 20psi in the midrange) before I max the injectors on cooler days, if I push it up to 15 or higher I hit the ole --.- every time. Get your fuel tuned with a W/B and it'll be better, meanwhile just taper your boost more towards redline.
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Old 01-22-2005, 12:08 PM   #12
CBRDSpeedfactory
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ALL lots of fast 1s
mostly silver!

Default yeah..

on a base map.... and stock really...

we saw afr's pegging the wideband at 10.0....it actually was going into calibration mode.....

when we tuned our car, we brought the afr's to around 10.9-11.1 on pump gas, and ran up too 1.5bar mid rpm and back to 1 bar at high rpm....

we were at about 95-96% (stock fueling)....this made some pretty good power, but i just ran that boost to see what i/c inlet temps we'd get off the turbo.....

we finally tuned with about 1.3 bar mid rpm tapered to 1 bar at redline, and it liked that..... barely reaching 11.1...

chad b
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