Tune ? for catless downpipe

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From: Ain't tellin'

Tune ? for catless downpipe

I know the P-0420 code needs to be deleted but what other codes need to be deleted too? Does the COT need to be shut off too? Can some one explain all of this to me too? I'd like an education on this as well. Thanks in advance.

-Mike

Mar 20, 2011 | 03:50 PM

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From: CT

if you're removing the cat altogether, then disable the COT protection...

you'll need to disable the 0420 code for no cat, and you'll also need to disable the rear O2 codes as well, since there is no cat, those codes would trigger as well.

so, all H02 bank 1 sensor 2 codes... the 420 cat. efficiency code... and disable the COT protection...

then, you'll want to put on about 50 miles, and do a data log to see where your fuel trims are at, and adjust your fueling accordingly, so that you get your average fuel trims in the 0 to -2 range...

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Mar 20, 2011 | 07:30 PM

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so if you go catless DP, you need a tune? or can i run a catless without a tune?

Mar 20, 2011 | 07:34 PM

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From: CT

Quote:

Originally Posted by SSGoat

so if you go catless DP, you need a tune? or can i run a catless without a tune?

you will need a tune...

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Mar 20, 2011 | 07:39 PM

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From: Ain't tellin'

Thanks Lew. Do you know what the code numbers are that would need to be deleted? I am trying to figure out some things on my car and want to be sure I do not miss anything. Thanks in advance.

-Mike

Mar 20, 2011 | 07:59 PM

nmp0098

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Quote:

Originally Posted by 06MonteSS

then, you'll want to put on about 50 miles, and do a data log to see where your fuel trims are at, and adjust your fueling accordingly, so that you get your average fuel trims in the 0 to -2 range...

I'm not familiar with Diablo's interface. Does it allow you to tune the VE via virtual tables or something similar? I had to write a lot of software to really get the VE curve fitting done correctly.

You could just lower the dynamic airflow thresholds so that it would always run on the MAF, if that is allowed in Diablo. That won't fix the acceleration enrichment calculations, but it will at least clear up the steady state stuff.

If none of that is available, you could just fudge the MAF transfer to compensate for the change in VE, although I wouldn't advocate that.

Mar 20, 2011 | 08:10 PM

Launching!

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aww crap, guess ima have to wait to get funds to get a tuner awwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww i was so happy haha

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Mar 21, 2011 | 12:52 PM

1CL3ANSUP3RSPORT

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Quote:

Originally Posted by SSGoat

aww crap, guess ima have to wait to get funds to get a tuner awwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww i was so happy haha

Whats up Goat,I thought you went into the Army

Mar 21, 2011 | 01:14 PM

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SScali

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^^^^ he is

Mar 21, 2011 | 03:50 PM

#11

Launching!

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i am, im in AIT, pretty much the school/training for my job in the army.. supposed "mechanic" but all im learning is how to change parts/diagnose haha womp wompp its fun though..
im national guard so im stationed around my home area.. i get to go home most weekends and after ive completed my drills err dayy..

and i wont get codes or anything running the dp without tune? i plan on tuning just not soon... incase i sell my baby..

edit: and i say i gotta wait cause i blew my extra funds last weekend XD lol

Mar 21, 2011 | 04:43 PM

#12

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From: Ain't tellin'

Does anyone know the numerical codes I need to delete? I just want to get this right. Thanks in advance, fellas.

-Mike

Mar 21, 2011 | 04:46 PM

#13

1CL3ANSUP3RSPORT

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Quote:

Originally Posted by SSGoat

Right on!

Mar 22, 2011 | 04:29 PM

#14

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From: Ain't tellin'

Ok, here are the codes I am going to disable for running no cat. The P-0420, P-0430, and the COT. Are there any other numerical codes I need to be concerned about or it this Ok? Thanks in advance.

-Mike

Mar 22, 2011 | 08:38 PM

#15

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From: Ain't tellin'

Do all of these need to be deleted? Any help would be great!

P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0421 Warm Up Catalyst Efficiency Below Threshold (Bank 1)
P0422 Main Catalyst Efficiency Below Threshold (Bank 1)
P0423 Heated Catalyst Efficiency Below Threshold (Bank 1)
P0424 Heated Catalyst Temperature Below Threshold (Bank 1)
P0430 Catalyst System Efficiency Below Threshold (Bank 2)
P0431 Warm Up Catalyst Efficiency Below Threshold (Bank 2)
P0432 Main Catalyst Efficiency Below Threshold (Bank 2)
P0433 Heated Catalyst Efficiency Below Threshold (Bank 2)
P0434 Heated Catalyst Temperature Below Threshold (Bank 2)

Mar 23, 2011 | 12:54 AM

#16

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From: CT

disabling the COT isn't a code... you need to disable the COT strategy...

now, the codes are:

P0420
P0137
P0138
P0140
P0141

that's it... not all of those ones that you listed...

and we don't have a bank 2

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Mar 23, 2011 | 08:42 AM

#17

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From: Ain't tellin'

Lew,

Thanks a million! This helps a ton! I can now try to do this the right way. Thank you!

-Mike

Mar 23, 2011 | 09:18 AM

#18

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From: Ain't tellin'

Lew,

Deleting the codes you specified; will that more or less disable the COT strategy too? Or most of it?

Thanks,

-Mike

Mar 23, 2011 | 12:09 PM

#19

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From: CT

Quote:

Originally Posted by Mgpeagle

Lew,

Deleting the codes you specified; will that more or less disable the COT strategy too? Or most of it?

Thanks,

-Mike

no, that won't disable the COT at all... those are just the trouble codes for the rear O2 sensor and cat. efficiency...

you need to find and disable the Catalytic Over Temp protection as well... it's a separate setting.. it's not a trouble code... should have an enable/disable option for it... should have temps listed for it too.. if you set the temps all to 1200* it will effectively disable it.. as well as the timing threshold.. think stock is like 5 seconds... set that to 60 seconds...

but yeah, there should be a main one for the entire COT strategy, to either enable or disable the whole thing... that's what you want to look for...

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Mar 25, 2011 | 07:24 AM

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