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Faster Idle For A New Driver & New Oil
Faster Idle For A New Driver & New Oil
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Faster Idle For A New Driver & New Oil
Faster Idle For A New Driver & New Oil
Faster Idle For A New Driver & New Oil
Faster Idle For A New Driver & New Oil
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Old 04-19-17, 11:21 AM   #1
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Default Faster Idle For A New Driver & New Oil

My son now has his learner's license and learned to drive a manual with my '15 STi. I think most will agree the STi is not the easiest manual to learn on, but he nearly has it mastered. I learned on a '73 VW bug, and it was a piece of cake compared to the STi.

Recently I used the Cobb AP to bump the idle up 200 RPM's to 900-950 RPM's, and that seems to really help smooth out the slow-speed starts in 1st gear. I even noticed it helped me as well, and I've been driving manuals off and on for over 30 years. Also, something I learned in the process is the thick line between 0 and 1,000 RPM's is not 500 RPM's, but rather 750 RPM's. Just a FYI for those that may not know.

Are there any downsides to bumping up the idle a couple hundred RPM's? I don't do a lot of stop and go driving, so a little extra heat while sitting shouldn't be a much of a factor.

And speaking of heat - another change I made, since my free oil changes are over, is I just switched from the Subaru oil to Shell Rotella T6 5w-40. After reading the extensive history of happy T6 users with STi motors, I'm a little disappointed I didn't do this sooner, especially with the Texas heat and the Subaru-recommended 5w-30 oil that shears to a 20 weight pretty quick.

Since T6 is really an oil designed for diesels, how will it interact with E85 if I make that upgrade this summer?

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Old 04-19-17, 11:46 AM   #2
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Default Re: Faster Idle For A New Driver & New Oil

1) bumping idle will affect fuel economy (ie, reason oems set low). You will see zero negative side effects except burning slightly more fuel at idle.

2) diesel oil has a different additive package to keep the soot suspended and not depositing/building up in the galleys/block. Aside from that, it's no different than any other oil you'd run.
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Old 04-19-17, 12:05 PM   #3
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Default Re: Faster Idle For A New Driver & New Oil

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Originally Posted by awenthol View Post
1) bumping idle will affect fuel economy (ie, reason oems set low). You will see zero negative side effects except burning slightly more fuel at idle.

2) diesel oil has a different additive package to keep the soot suspended and not depositing/building up in the galleys/block. Aside from that, it's no different than any other oil you'd run.
I know the T6 is not "energy conserving", which is one of the reasons many people like the T6.
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Old 04-19-17, 12:34 PM   #4
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Default Re: Faster Idle For A New Driver & New Oil

There are plenty of guys here running T6 and E85. I havent herd of any problems running E85 related to using T6 oil. In my opinion, if you have a good oil change service interval then you should have nothing to worry about. I do not run E85 since is not easily available to me here, but i have been using T6 oil for years and havent had a problem.
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Old 04-19-17, 12:37 PM   #5
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Default Re: Faster Idle For A New Driver & New Oil

I noticed cold start runs at higher RPM
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Old 04-19-17, 12:43 PM   #6
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Default Re: Faster Idle For A New Driver & New Oil

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I noticed cold start runs at higher RPM
Correct, and then it settles down when warm. I set mine for +200 RPM's with AC off, and +250 RPM's with AC on.
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Old 04-19-17, 12:46 PM   #7
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Default Re: Faster Idle For A New Driver & New Oil

Also heard bumpin up the idle makes oil pressure run more stable on idle.
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Old 04-19-17, 12:52 PM   #8
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Default Re: Faster Idle For A New Driver & New Oil

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Originally Posted by RussellX View Post
I noticed cold start runs at higher RPM
... To get better oiling of valvetrain, etc and prevent cylinder wash/fuel dilution.

My understanding is most tuners are bumping idle to 1000 rpm by default?
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Old 04-19-17, 01:08 PM   #9
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Default Re: Faster Idle For A New Driver & New Oil

Quote:
Originally Posted by awenthol View Post
... To get better oiling of valvetrain, etc and prevent cylinder wash/fuel dilution.

My understanding is most tuners are bumping idle to 1000 rpm by default?
I had a protune done by Cobb in Plano, TX, and the idle was set around 750. The AP lets you move it +/- 300 RPM's.
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Old 04-20-17, 05:25 AM   #10
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Default Re: Faster Idle For A New Driver & New Oil

Quote:
Originally Posted by awenthol View Post
... To get better oiling of valvetrain, etc and prevent cylinder wash/fuel dilution.

My understanding is most tuners are bumping idle to 1000 rpm by default?
You are correct. Mikey bumped my idle to right under 1k when he tuned my car.
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