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Thread: 68 camaro supercharged 5.3 idle problem

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    68 camaro supercharged 5.3 idle problem

    it ran fine i put a intercooler on it now when i rev it and let off it will surge and die it will start right back up and idle fine until i rev it again what do i need to adjust the throttle body is on the supercharger and it goes through the intercooler before it goes into the intake

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    Fuel Injected! brian617's Avatar
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    Why do you need an intercooler for a supercharger?
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

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    EFI GearHead ! EagleMark's Avatar
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    Pictures?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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    Quote Originally Posted by brian617 View Post
    Why do you need an intercooler for a supercharger?
    Increased thermal efficiency (i.e increased power output, reduced knock sensitivity, etc.) - just like the OEM LSA and LS9 engines - factory superchargers, with factory intercoolers.

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    Fuel Injected! brian617's Avatar
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    I understand what an intercooler does and why you'd need one with a turbo as the turbo heat soaks the intake charge. Cooling cold air seems futile to me lol.
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

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    Quote Originally Posted by brian617 View Post
    I understand what an intercooler does and why you'd need one with a turbo as the turbo heat soaks the intake charge. Cooling cold air seems futile to me lol.
    That is just it - the air stream coming out of a supercharger is not as cool as the air going into it. Ever notice how the 80 gallon tank on the compressor in your shop can get very hot to the touch when using multiple air tools ? It is not soaking up any heat from anything - mechanically compressing air causes its temperature to increase.
    Last edited by Buzz; 03-21-2014 at 04:20 PM. Reason: - typo

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    it was running 230 degrees before now about 120 but it just wants to die out when i let off it fast

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    My apologies for the thermodynamic sidetrack ....

    That is a good reduction in temperature. Where are the MAF and IAT located in the air stream ? Also, you never posted a tune ... what are you running the the 5.3L with ? PCM, E38, E67 ?

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    no maf the iat is after the cooler right before the intake

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    EFI GearHead ! EagleMark's Avatar
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    Quote Originally Posted by danny68ss View Post
    it was running 230 degrees before now about 120 but it just wants to die out when i let off it fast
    I had no idea SC made that much heat! Almost 50% reduction in IAT is huge!

    I know the tune is more important and your lucky to have Buzz helping, but if you have a picture I'd like to see the setup...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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    I took a very quick look at your tune. You are running an EFILive COS3 OS. Do you have a WBO ? How have you been tuning thus far ? It appears as if the Boost VE table has not been refined beyond the initial setup.

    Can you post a log of the stall event ?

    You may get more hands-on support with this if you were to post on the EFILive forum.

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    Fuel Injected! brian617's Avatar
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    Compression = friction = heat I get that, but 110* reduction in IAT I had no idea it could be that much.
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

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    no wide band i need to get one bad lextech helped me and set up a starter tune it runs good now but i know it needs a lot more tuning it wouldnt run over 5000 until i changed injectors and put the intercooler on it here is the log of it ideling
    Attached Files Attached Files

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    Quote Originally Posted by EagleMark View Post
    I had no idea SC made that much heat! Almost 50% reduction in IAT is huge!

    I know the tune is more important and your lucky to have Buzz helping, but if you have a picture I'd like to see the setup...
    here are a couple pictures
    Attached Images Attached Images

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    That is quite the project. Did that start out as a manifold mounted supercharger?

    At any rate, why is the throttle body before the supercharger? All the air volume between the throttle body and the engine will really mess with your throttle response.

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