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Registered
Join Date: Jul 2005
Location: Reno, NV
Posts: 5,941
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turbo tuning suggestions
I just got my engine into my car. My buddy came over with his LM-1. We tuned idle to 13.5 and it seems to be running well except it's going lean on deceleration ( 15.7) is this normal he seems to think it's too lean. If so what can be done to correct it ??
Thanks Todd
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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06-26-2006, 10:27 AM
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Registered
Join Date: Jan 2005
Location: KENDAL,CUMBRIA, UK
Posts: 1,580
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HI a little more info on the engine would not go a miss, as to just what you have and then we just may be able to help, thank you
regards mike |
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06-26-2006, 11:30 AM
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Registered
Join Date: Jul 2005
Location: Reno, NV
Posts: 5,941
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OOPs, it's a 79 3.3 turbo with a K27-7200 turbo.
SC Cams .. Hope that helps
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"Todd" 98 Tahoe ,2007 Saturn Vue 86 930 black and stock, 80 930 blue tracdog 91 Spec Miata (yeah I race a chick car) "life"ll kill ya" Warren Zevon |
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06-26-2006, 11:45 AM
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resident samsquamch
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,815
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some good info here:
http://forums.rennlist.com/rennforums/showthread.php?t=267790 I have mine tuned to 14.5 at idle. I also have an Imagine Auto fuel head that's capable of flowing more fuel. I'm still in the engine break-in period so I'm not pushing things too far. But at spirited runs (some boost), I'm at about 12.3 for AFRs
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-jeff back in the saddle: '95 993 - just another black C2 *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction... "Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP  )
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06-26-2006, 12:08 PM
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resident samsquamch
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,815
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On deceleration, things do go lean
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-jeff back in the saddle: '95 993 - just another black C2 *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction... "Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP )
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06-26-2006, 12:09 PM
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Registered
Join Date: Mar 2003
Location: Edmonton
Posts: 697
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What's most important is the AFR under boost. Look for 12.5 or richer. Elsewhere it's more about driveability and emissions, so it's more or less your call.
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Matt B '73 911E |
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06-26-2006, 12:19 PM
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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: St Johns, FL
Posts: 1,210
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On decel, it doesn't matter. In some cases (with EFI), you can shut the injectors off for greater decel - this will send the AFR off the scale.
On idle, my car likes 12.9 or so, and does not foul plugs. Give it what it wants. |
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06-26-2006, 05:13 PM
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Registered
Join Date: Jun 2001
Location: Sweden
Posts: 5,911
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It shhould go lean on deccel. Actually, it should shut down fueling completly. As CIS is old and crude, this is impossible so it still injects some gasoline into the engine which leads to backfire on deccel.
Nothing to worry about.
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Thank you for your time, |
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06-27-2006, 06:57 AM
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