If it didn't used to do this, then you also need to run a boost leak test and an exhaust leak test.

My bet is on exhaust leak.

Check all the nuts on the exhaust manifold, bolts on the hotside, bolts on the o2 housing, tp, etc.

ETA: I say this because you say you just added a catback. I had an issue when I switched from a high flow cat to a test pipe that I started getting really bad exhaust leaks. Turned out that my test pipe had been fitted backwards by the previous owner and had warped the flanges. It was also about 1/2" too short and was putting strain on the entire system. Your new catback might be doing the same.

 

There are very slight leaks where the OEM downpipe (2.5") meets the 3" test pipe flange. And again where the CBE (2.5") meets the TP.

These seem very slight to me though. Any idea how to completely seal mismatched flanges?

That TP you had wasn't a Speed Circuit one was it?

One more question, wouldn't an exhaust leak cause leaner Wb02 readings, but not really affect IDC?

 

That was my concern, I just can't believe I'm knocking on that door this early in my mod cycle I am confident that larger injectors would lower the IDC, I just don't want to buy them as a band-aid, I want to be sure that is the issue before I do that......

 

Get a real o2 housing and it will mate up better

It was a UR test pipe (one of the very original pieces).

An exhaust leak in front of the primary o2 sensor will cause extra fuel to be put into the system and lean readings. I know this because I've cracked the o2 housing (UR again, I've got an AMS now) before the primary o2 sensor twice. Also I've had issues with the stock bolts holding the hotside onto the manifold backing out.

The former caused massive AFRs, like 17+ at idle. The latter caused no visible change in AFRs at idle but the amount of fuel going through the system was pretty apparent by the black cloud of smoke that was coming out my exhaust.

 

I am not discounting your experience, but my LTFT idle is .9 and cruise is now 4.X

I am not seeing any smoke out the back on WOT... Idle A/F is 14.7 as verified by my Wb02. Also I still don't think an exhaust leak can cause high IDC on WOT as the ECU does not look at the 02 on WOT.

If I am wrong please correct me.

 

Quit arguing with people that are trying to help you... they might stop.

 

I'm sorry I am not trying to argue, and greatly appreciate everyone's help. I do need help, I'm just trying to understand why you guys are telling me what your telling me.

I am not new to tuning and have alot of experience as well, obviously not as much as some others on this board, hence the help request.

I will check for a large exhaust leak, though I still don't understand how it could affect IDC at WOT

 

tephra, i can;t seem to see my idc @ evoscan .. but i can see only ipw, my request id for idc in evoscan is 23808747 which is same as rpm req id .. ???? can you help me out on this, would like to know how are my injectors working. 08 mr sst edm 53050006 rom id. thx. kinda worried if i'm over the limit

 

i agree with goofy...it could affect the IDC and afr readings..i had this issue before with my boosted civic..i had an exhaust leak when i repaired it, the tune became so rich because the tune was made when i had an exhaust leak..this exhaust leak was of course before the wb o2 sensor...i'm assuming that your wb o2 sensor is in the TP right? that small leak that you are saying in the gasket/flange area could be the culprit...the exhaust leak i had in my civic was as small as ballpen point (the 0.5)..

how it affects IDC at wot? well put it this way, you're tuning the car now with that leak (this a scenario that we're assuming).. technically your turbo is now blowing more because it needs to reach that certain target that you tuned for...same goes for your injectors, it needs to reach that goal that you've set in your tune...now if the leak is leaking any air/fuel (which should not be the case) before the wb o2 sensor is reading, the injectors will continue its dc to reach the tune that you did..and this is all assuming if and only if your wb o2 sensor is in the TP which is after the leak that you’re referring to, if I read where your leak is located is correct…

if this is not the case, you could check your injector scaling maybe?

 

Are you sure your formula for IDC is correct?

 

^^ +1.easiest way to check first..

 

I would agree with you IF the ECU was trying to reach a target A/F and then used feedback from the 02 to make adjustments. But this does not happen in WOT, what you are describing only happens in part/cruise situations.

Our Ecu's in WOT only look at load and apply the calculated IPW to obtain the target A/F. It does not make corrections under WOT. That is why we have Wb02's to make sure all is well

That being said I will try to seal the any/all exhaust leaks I have, though sealing mismatch exhaust flanges is proving difficult.

I might be barking up the wrong tree, but I found this:

http://www.injector.com/injectorselection.php

Scroll down to Fuel Injector Max Capacity Worksheet and select 57lb/min (that is our injector size) and .5 for the BSFC and you get a max of 364.8

This seems a little low, but I am sure I am over that level at the crank....Just food for thought.

EDIT: I just realized the max capacity may be wrong as that site assumes a constant 43.5psi and our cars increase FP 1:1 with boost...I have no idea what max capacity is for our injectors now

 

I believe so, I used the Data.xml portion from mrFred.

Also IDC is usually calculated by RPM*IPW/1200.

So unles the IPW that Evoscan is reporting is incorrect, I believe the IDC to be correct. I also cannot seem to get it much richer, though I haven't tried agressive Fuel mapping as it's stating 115% IDC now!

 

by default in evoscan v2.7b5 idc req id is 23808747 and the function is [IPW]*31.25*x/1200 units in %

the IPW req id is 2380A934 and function is x/1000

IPW is logging fine but IDC shows 0.0 all the time.

ride is 08 MR EDM logging using mode23 under 08 JDM mode23.

thx for help and replies

so should i change the function to [RPM]*[IPW]*x/1200 ? anyways will give it a shot and see if it works tmr.

 

Bryan (GST) informed me that the Evo X does adjust fuel delivery during WOT to reach target A/F.

I was wrong. I guess I still have the old DSM menatility to tuning....

I will seal any/all exhaust and intake leaks I may find.

Can anyone recommend a way to seal mismatched sized exhaust flanges? 2.5 --> 3 and 3 --> 2.5 High temp silicon?