LS2 Cold Start Injector
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Joined: Jul 2006
Posts: 9
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What I am trying to accomplish
This is what I am trying to accomplish. When I start the engine after it has set for a long time, I get a loud roar when it starts up, which I assume is from more fuel for cold start. I want to be able to replicate that condition, even when the engine is warm, for car shows. Is there a way to do this?
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Melting Slicks
Joined: Mar 2007
Posts: 2,391
Likes: 23
From: Santa Barbara CA
There may be other reasons, but the main reason why the engine idles high like that on a cold start is to help warm the cats and 02 sensors up quicker.
There are parameters in the tune for start-up idle speed and airflow that you could probably tweak if you want that bark on warm starts.
There are parameters in the tune for start-up idle speed and airflow that you could probably tweak if you want that bark on warm starts.
Race Director
Joined: May 2004
Posts: 16,667
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From: Raleigh, NC
St. Jude Donor '15
The "idle startup airflow vs. ERT vs. ECT" table looks like what you'd want to change (my best guess anyways)
The scale on the left goes from -40*F to 306*F
Scale across the top goes goes from 0 RPM to 8K RPM. Easy enough to change in HP Tuners.
Here's a section of the data:
4.2242 4.2242 4.0841 3.9452 3.6425 3.3599
4.1198 4.1198 3.9849 3.8311 3.5087 3.2209
3.6307 3.4839 3.2805 3.0375 2.7641 2.7192
3.0955 2.9407 2.7200 2.5315 2.3227 2.2857
2.7043 2.6059 2.4719 2.3132 2.1801 2.1428
2.4407 2.3770 2.2753 2.1743 2.0768 2.0409
2.3186 2.2580 2.1595 2.0702 2.0004 1.9662
2.1907 2.1335 2.0304 1.9727 1.9387 1.9054
2.0560 2.0022 1.9163 1.8514 1.8195 1.7882
1.9291 1.8788 1.7874 1.7372 1.7072 1.6779
1.4947 1.4557 1.4959 1.4687 1.4420 1.4157
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.6528 1.6097 1.4939 1.4641 1.4348 1.4061
1.6408 1.5979 1.4959 1.4687 1.4420 1.4157
The scale on the left goes from -40*F to 306*F
Scale across the top goes goes from 0 RPM to 8K RPM. Easy enough to change in HP Tuners.
Here's a section of the data:
4.2242 4.2242 4.0841 3.9452 3.6425 3.3599
4.1198 4.1198 3.9849 3.8311 3.5087 3.2209
3.6307 3.4839 3.2805 3.0375 2.7641 2.7192
3.0955 2.9407 2.7200 2.5315 2.3227 2.2857
2.7043 2.6059 2.4719 2.3132 2.1801 2.1428
2.4407 2.3770 2.2753 2.1743 2.0768 2.0409
2.3186 2.2580 2.1595 2.0702 2.0004 1.9662
2.1907 2.1335 2.0304 1.9727 1.9387 1.9054
2.0560 2.0022 1.9163 1.8514 1.8195 1.7882
1.9291 1.8788 1.7874 1.7372 1.7072 1.6779
1.4947 1.4557 1.4959 1.4687 1.4420 1.4157
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.5438 1.5035 1.4075 1.3819 1.3567 1.3319
1.6528 1.6097 1.4939 1.4641 1.4348 1.4061
1.6408 1.5979 1.4959 1.4687 1.4420 1.4157